transCli.c 35.4 KB
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/* * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
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 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifdef USE_UV

#include "transComm.h"

typedef struct SCliConn {
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  T_REF_DECLARE()
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  uv_connect_t connReq;
  uv_stream_t* stream;
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  uv_write_t   writeReq;
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  void*        hostThrd;
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  SConnBuffer  readBuf;
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  void*        data;
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  STransQueue  cliMsgs;
  queue        conn;
  uint64_t     expireTime;
  int          hThrdIdx;
  STransCtx    ctx;
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  bool       broken;  // link broken or not
  ConnStatus status;  //
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  char*    ip;
  uint32_t port;

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  // debug and log info
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  struct sockaddr_in addr;
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  struct sockaddr_in locaddr;
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} SCliConn;
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typedef struct SCliMsg {
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  STransConnCtx* ctx;
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  STransMsg      msg;
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  queue          q;
  uint64_t       st;
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  STransMsgType  type;
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  int            sent;  //(0: no send, 1: alread sent)
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} SCliMsg;

typedef struct SCliThrdObj {
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  TdThread    thread;
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  uv_loop_t*  loop;
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  SAsyncPool* asyncPool;
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  uv_timer_t  timer;
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  void*       pool;  // conn pool

  // msg queue
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  queue         msg;
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  TdThreadMutex msgMtx;
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  SDelayQueue*  delayQueue;
  uint64_t      nextTimeout;  // next timeout
  void*         pTransInst;   //
  bool          quit;
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} SCliThrdObj;

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typedef struct SCliObj {
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  char          label[TSDB_LABEL_LEN];
  int32_t       index;
  int           numOfThreads;
  SCliThrdObj** pThreadObj;
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} SCliObj;
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typedef struct SConnList {
  queue conn;
} SConnList;

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// conn pool
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// add expire timeout and capacity limit
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static void*     createConnPool(int size);
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static void*     destroyConnPool(void* pool);
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static SCliConn* getConnFromPool(void* pool, char* ip, uint32_t port);
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static void      addConnToPool(void* pool, SCliConn* conn);
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// register timer in each thread to clear expire conn
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static void cliTimeoutCb(uv_timer_t* handle);
// alloc buf for recv
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static void cliAllocRecvBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf);
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// callback after  read nbytes from socket
static void cliRecvCb(uv_stream_t* cli, ssize_t nread, const uv_buf_t* buf);
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// callback after write data to socket
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static void cliSendCb(uv_write_t* req, int status);
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// callback after conn  to server
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static void cliConnCb(uv_connect_t* req, int status);
static void cliAsyncCb(uv_async_t* handle);
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static int cliAppCb(SCliConn* pConn, STransMsg* pResp, SCliMsg* pMsg);
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static SCliConn* cliCreateConn(SCliThrdObj* thrd);
static void      cliDestroyConn(SCliConn* pConn, bool clear /*clear tcp handle or not*/);
static void      cliDestroy(uv_handle_t* handle);
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static void      cliSend(SCliConn* pConn);
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/*
 * set TCP connection timeout per-socket level
 */
static int cliCreateSocket();
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// process data read from server, add decompress etc later
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static void cliHandleResp(SCliConn* conn);
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// handle except about conn
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static void cliHandleExcept(SCliConn* conn);
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// handle req from app
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static void cliHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd);
static void cliHandleQuit(SCliMsg* pMsg, SCliThrdObj* pThrd);
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static void cliHandleRelease(SCliMsg* pMsg, SCliThrdObj* pThrd);
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static void (*cliAsyncHandle[])(SCliMsg* pMsg, SCliThrdObj* pThrd) = {cliHandleReq, cliHandleQuit, cliHandleRelease};
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static void cliSendQuit(SCliThrdObj* thrd);
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static void destroyUserdata(STransMsg* userdata);
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static int cliRBChoseIdx(STrans* pTransInst);
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static void destroyCmsg(SCliMsg* cmsg);
static void transDestroyConnCtx(STransConnCtx* ctx);
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// thread obj
static SCliThrdObj* createThrdObj();
static void         destroyThrdObj(SCliThrdObj* pThrd);
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static void cliWalkCb(uv_handle_t* handle, void* arg);

#define CLI_RELEASE_UV(loop)        \
  do {                              \
    uv_walk(loop, cliWalkCb, NULL); \
    uv_run(loop, UV_RUN_DEFAULT);   \
    uv_loop_close(loop);            \
  } while (0);

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// snprintf may cause performance problem
#define CONN_CONSTRUCT_HASH_KEY(key, ip, port)          \
  do {                                                  \
    snprintf(key, sizeof(key), "%s:%d", ip, (int)port); \
  } while (0)

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#define CONN_HOST_THREAD_INDEX(conn) (conn ? ((SCliConn*)conn)->hThrdIdx : -1)
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#define CONN_PERSIST_TIME(para)      (para * 1000 * 10)
#define CONN_GET_HOST_THREAD(conn)   (conn ? ((SCliConn*)conn)->hostThrd : NULL)
#define CONN_GET_INST_LABEL(conn)    (((STrans*)(((SCliThrdObj*)(conn)->hostThrd)->pTransInst))->label)
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#define CONN_SHOULD_RELEASE(conn, head)                                                  \
  do {                                                                                   \
    if ((head)->release == 1 && (head->msgLen) == sizeof(*head)) {                       \
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      uint64_t ahandle = head->ahandle;                                                  \
      CONN_GET_MSGCTX_BY_AHANDLE(conn, ahandle);                                         \
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      conn->status = ConnRelease;                                                        \
      transClearBuffer(&conn->readBuf);                                                  \
      transFreeMsg(transContFromHead((char*)head));                                      \
      tDebug("cli conn %p receive release request, ref: %d", conn, T_REF_VAL_GET(conn)); \
      while (T_REF_VAL_GET(conn) > 1) {                                                  \
        transUnrefCliHandle(conn);                                                       \
      }                                                                                  \
      if (T_REF_VAL_GET(conn) == 1) {                                                    \
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        transUnrefCliHandle(conn);                                                       \
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      }                                                                                  \
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      destroyCmsg(pMsg);                                                                 \
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      return;                                                                            \
    }                                                                                    \
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  } while (0)

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#define CONN_GET_MSGCTX_BY_AHANDLE(conn, ahandle)                                         \
  do {                                                                                    \
    int i = 0, sz = transQueueSize(&conn->cliMsgs);                                       \
    for (; i < sz; i++) {                                                                 \
      pMsg = transQueueGet(&conn->cliMsgs, i);                                            \
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      if (pMsg != NULL && pMsg->ctx != NULL && (uint64_t)pMsg->ctx->ahandle == ahandle) { \
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        break;                                                                            \
      }                                                                                   \
    }                                                                                     \
    if (i == sz) {                                                                        \
      pMsg = NULL;                                                                        \
    } else {                                                                              \
      pMsg = transQueueRm(&conn->cliMsgs, i);                                             \
    }                                                                                     \
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  } while (0)
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#define CONN_GET_NEXT_SENDMSG(conn)                 \
  do {                                              \
    int i = 0;                                      \
    do {                                            \
      pCliMsg = transQueueGet(&conn->cliMsgs, i++); \
      if (pCliMsg && 0 == pCliMsg->sent) {          \
        break;                                      \
      }                                             \
    } while (pCliMsg != NULL);                      \
    if (pCliMsg == NULL) {                          \
      goto _RETURN;                                 \
    }                                               \
  } while (0)
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#define CONN_HANDLE_THREAD_QUIT(thrd) \
  do {                                \
    if (thrd->quit) {                 \
      return;                         \
    }                                 \
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  } while (0)

#define CONN_HANDLE_BROKEN(conn) \
  do {                           \
    if (conn->broken) {          \
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      cliHandleExcept(conn);     \
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      return;                    \
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    }                            \
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  } while (0)
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#define CONN_SET_PERSIST_BY_APP(conn) \
  do {                                \
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    if (conn->status == ConnNormal) { \
      conn->status = ConnAcquire;     \
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      transRefCliHandle(conn);        \
    }                                 \
  } while (0)
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#define CONN_NO_PERSIST_BY_APP(conn) \
  (((conn)->status == ConnNormal || (conn)->status == ConnInPool) && T_REF_VAL_GET(conn) == 1)
#define CONN_RELEASE_BY_SERVER(conn) \
  (((conn)->status == ConnRelease || (conn)->status == ConnInPool) && T_REF_VAL_GET(conn) == 1)
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#define REQUEST_NO_RESP(msg)         ((msg)->noResp == 1)
#define REQUEST_PERSIS_HANDLE(msg)   ((msg)->persistHandle == 1)
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#define REQUEST_RELEASE_HANDLE(cmsg) ((cmsg)->type == Release)
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#define EPSET_GET_INUSE_IP(epSet)   ((epSet)->eps[(epSet)->inUse].fqdn)
#define EPSET_GET_INUSE_PORT(epSet) ((epSet)->eps[(epSet)->inUse].port)

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static void* cliWorkThread(void* arg);
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bool cliMaySendCachedMsg(SCliConn* conn) {
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  if (!transQueueEmpty(&conn->cliMsgs)) {
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    SCliMsg* pCliMsg = NULL;
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    CONN_GET_NEXT_SENDMSG(conn);
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    cliSend(conn);
  }
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  return false;
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_RETURN:
  return false;
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}
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void cliHandleResp(SCliConn* conn) {
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  SCliThrdObj* pThrd = conn->hostThrd;
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  STrans*      pTransInst = pThrd->pTransInst;
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  STransMsgHead* pHead = (STransMsgHead*)(conn->readBuf.buf);
  pHead->code = htonl(pHead->code);
  pHead->msgLen = htonl(pHead->msgLen);
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  STransMsg transMsg = {0};
  transMsg.contLen = transContLenFromMsg(pHead->msgLen);
  transMsg.pCont = transContFromHead((char*)pHead);
  transMsg.code = pHead->code;
  transMsg.msgType = pHead->msgType;
  transMsg.ahandle = NULL;
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  SCliMsg*       pMsg = NULL;
  STransConnCtx* pCtx = NULL;
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  CONN_SHOULD_RELEASE(conn, pHead);
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  if (CONN_NO_PERSIST_BY_APP(conn)) {
    pMsg = transQueuePop(&conn->cliMsgs);
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    pCtx = pMsg ? pMsg->ctx : NULL;
    if (pMsg == NULL && !CONN_NO_PERSIST_BY_APP(conn)) {
      transMsg.ahandle = transCtxDumpVal(&conn->ctx, transMsg.msgType);
      if (transMsg.ahandle == NULL) {
        transMsg.ahandle = transCtxDumpBrokenlinkVal(&conn->ctx, (int32_t*)&(transMsg.msgType));
      }
      tDebug("cli conn %p construct ahandle %p, persist: 0", conn, transMsg.ahandle);
    } else {
      transMsg.ahandle = pCtx ? pCtx->ahandle : NULL;
      tDebug("cli conn %p get ahandle %p, persist: 0", conn, transMsg.ahandle);
    }
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  } else {
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    uint64_t ahandle = (uint64_t)pHead->ahandle;
    CONN_GET_MSGCTX_BY_AHANDLE(conn, ahandle);
    if (pMsg == NULL) {
      transMsg.ahandle = transCtxDumpVal(&conn->ctx, transMsg.msgType);
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      tDebug("cli conn %p construct ahandle %p by %s, persist: 1", conn, transMsg.ahandle, TMSG_INFO(transMsg.msgType));
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      if (!CONN_RELEASE_BY_SERVER(conn) && transMsg.ahandle == NULL) {
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        transMsg.code = TSDB_CODE_RPC_NETWORK_UNAVAIL;
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        transMsg.ahandle = transCtxDumpBrokenlinkVal(&conn->ctx, (int32_t*)&(transMsg.msgType));
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        tDebug("cli conn %p construct ahandle %p due brokenlink, persist: 1", conn, transMsg.ahandle);
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      }
    } else {
      pCtx = pMsg ? pMsg->ctx : NULL;
      transMsg.ahandle = pCtx ? pCtx->ahandle : NULL;
      tDebug("cli conn %p get ahandle %p, persist: 1", conn, transMsg.ahandle);
    }
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  }
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  // buf's mem alread translated to transMsg.pCont
  transClearBuffer(&conn->readBuf);

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  if (!CONN_NO_PERSIST_BY_APP(conn)) {
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    transMsg.handle = conn;
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    tDebug("%s cli conn %p ref by app", CONN_GET_INST_LABEL(conn), conn);
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  }

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  tDebug("%s cli conn %p %s received from %s:%d, local info: %s:%d, msg size: %d", pTransInst->label, conn,
         TMSG_INFO(pHead->msgType), taosInetNtoa(conn->addr.sin_addr), ntohs(conn->addr.sin_port),
         taosInetNtoa(conn->locaddr.sin_addr), ntohs(conn->locaddr.sin_port), transMsg.contLen);
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  if (pCtx == NULL && CONN_NO_PERSIST_BY_APP(conn)) {
    tTrace("except, server continue send while cli ignore it");
    // transUnrefCliHandle(conn);
    return;
  }
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  if (CONN_RELEASE_BY_SERVER(conn) && transMsg.ahandle == NULL) {
    tTrace("except, server continue send while cli ignore it");
    // transUnrefCliHandle(conn);
    return;
  }
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  int ret = cliAppCb(conn, &transMsg, pMsg);
  if (ret != 0) {
    tTrace("try to send req to next node");
    return;
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  }
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  destroyCmsg(pMsg);

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  if (cliMaySendCachedMsg(conn) == true) {
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    return;
  }
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  if (CONN_NO_PERSIST_BY_APP(conn)) {
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    addConnToPool(pThrd->pool, conn);
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  }
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  uv_read_start((uv_stream_t*)conn->stream, cliAllocRecvBufferCb, cliRecvCb);
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  // start thread's timer of conn pool if not active
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  if (!uv_is_active((uv_handle_t*)&pThrd->timer) && pTransInst->idleTime > 0) {
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    // uv_timer_start((uv_timer_t*)&pThrd->timer, cliTimeoutCb, CONN_PERSIST_TIME(pRpc->idleTime) / 2, 0);
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  }
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}
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void cliHandleExcept(SCliConn* pConn) {
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  if (transQueueEmpty(&pConn->cliMsgs)) {
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    if (pConn->broken == true && CONN_NO_PERSIST_BY_APP(pConn)) {
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      tTrace("%s cli conn %p handle except, persist:0", CONN_GET_INST_LABEL(pConn), pConn);
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      transUnrefCliHandle(pConn);
      return;
    }
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  }
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  SCliThrdObj* pThrd = pConn->hostThrd;
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  STrans*      pTransInst = pThrd->pTransInst;
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  bool         once = false;
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  do {
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    SCliMsg* pMsg = transQueuePop(&pConn->cliMsgs);
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    if (pMsg == NULL && once) {
      break;
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    }
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    STransConnCtx* pCtx = pMsg ? pMsg->ctx : NULL;
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    STransMsg transMsg = {0};
    transMsg.code = TSDB_CODE_RPC_NETWORK_UNAVAIL;
    transMsg.msgType = pMsg ? pMsg->msg.msgType + 1 : 0;
    transMsg.ahandle = NULL;
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    transMsg.handle = pConn;
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    if (pMsg == NULL && !CONN_NO_PERSIST_BY_APP(pConn)) {
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      transMsg.ahandle = transCtxDumpVal(&pConn->ctx, transMsg.msgType);
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      tDebug("%s cli conn %p construct ahandle %p by %s", CONN_GET_INST_LABEL(pConn), pConn, transMsg.ahandle,
             TMSG_INFO(transMsg.msgType));
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      if (transMsg.ahandle == NULL) {
        transMsg.ahandle = transCtxDumpBrokenlinkVal(&pConn->ctx, (int32_t*)&(transMsg.msgType));
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        tDebug("%s cli conn %p construct ahandle %p due to brokenlink", CONN_GET_INST_LABEL(pConn), pConn,
               transMsg.ahandle);
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      }
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    } else {
      transMsg.ahandle = pCtx ? pCtx->ahandle : NULL;
    }

    if (pCtx == NULL || pCtx->pSem == NULL) {
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      if (transMsg.ahandle == NULL) {
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        once = true;
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        continue;
      }
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    }
    int ret = cliAppCb(pConn, &transMsg, pMsg);
    if (ret != 0) {
      tTrace("try to send req to next node");
      return;
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    }
    destroyCmsg(pMsg);
    tTrace("%s cli conn %p start to destroy", CONN_GET_INST_LABEL(pConn), pConn);
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  } while (!transQueueEmpty(&pConn->cliMsgs));
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  transUnrefCliHandle(pConn);
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}
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void cliTimeoutCb(uv_timer_t* handle) {
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  SCliThrdObj* pThrd = handle->data;
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  STrans*      pTransInst = pThrd->pTransInst;
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  int64_t      currentTime = pThrd->nextTimeout;
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  tTrace("%s, cli conn timeout, try to remove expire conn from conn pool", pTransInst->label);
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  SConnList* p = taosHashIterate((SHashObj*)pThrd->pool, NULL);
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  while (p != NULL) {
    while (!QUEUE_IS_EMPTY(&p->conn)) {
      queue*    h = QUEUE_HEAD(&p->conn);
      SCliConn* c = QUEUE_DATA(h, SCliConn, conn);
      if (c->expireTime < currentTime) {
        QUEUE_REMOVE(h);
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        transUnrefCliHandle(c);
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      } else {
        break;
      }
    }
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    p = taosHashIterate((SHashObj*)pThrd->pool, p);
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  }

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  pThrd->nextTimeout = taosGetTimestampMs() + CONN_PERSIST_TIME(pTransInst->idleTime);
  uv_timer_start(handle, cliTimeoutCb, CONN_PERSIST_TIME(pTransInst->idleTime) / 2, 0);
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}
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void* createConnPool(int size) {
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  // thread local, no lock
  return taosHashInit(size, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_NO_LOCK);
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}
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void* destroyConnPool(void* pool) {
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  SConnList* connList = taosHashIterate((SHashObj*)pool, NULL);
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  while (connList != NULL) {
    while (!QUEUE_IS_EMPTY(&connList->conn)) {
      queue* h = QUEUE_HEAD(&connList->conn);
      QUEUE_REMOVE(h);
      SCliConn* c = QUEUE_DATA(h, SCliConn, conn);
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      cliDestroyConn(c, true);
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    }
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    connList = taosHashIterate((SHashObj*)pool, connList);
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  }
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  taosHashCleanup(pool);
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  return NULL;
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}

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static SCliConn* getConnFromPool(void* pool, char* ip, uint32_t port) {
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  char key[128] = {0};
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  CONN_CONSTRUCT_HASH_KEY(key, ip, port);
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  SHashObj*  pPool = pool;
  SConnList* plist = taosHashGet(pPool, key, strlen(key));
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  if (plist == NULL) {
    SConnList list;
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    taosHashPut(pPool, key, strlen(key), (void*)&list, sizeof(list));
    plist = taosHashGet(pPool, key, strlen(key));
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    QUEUE_INIT(&plist->conn);
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  }

  if (QUEUE_IS_EMPTY(&plist->conn)) {
    return NULL;
  }
  queue* h = QUEUE_HEAD(&plist->conn);
  QUEUE_REMOVE(h);
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  SCliConn* conn = QUEUE_DATA(h, SCliConn, conn);
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  conn->status = ConnNormal;
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  QUEUE_INIT(&conn->conn);
  return conn;
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}
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static void addConnToPool(void* pool, SCliConn* conn) {
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  SCliThrdObj* thrd = conn->hostThrd;
  CONN_HANDLE_THREAD_QUIT(thrd);

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  STrans* pTransInst = ((SCliThrdObj*)conn->hostThrd)->pTransInst;
  conn->expireTime = taosGetTimestampMs() + CONN_PERSIST_TIME(pTransInst->idleTime);
  transCtxCleanup(&conn->ctx);
  transQueueClear(&conn->cliMsgs);
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  conn->status = ConnInPool;
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  char key[128] = {0};
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  CONN_CONSTRUCT_HASH_KEY(key, conn->ip, conn->port);
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  tTrace("cli conn %p added to conn pool, read buf cap: %d", conn, conn->readBuf.cap);
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  SConnList* plist = taosHashGet((SHashObj*)pool, key, strlen(key));
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  // list already create before
  assert(plist != NULL);
  QUEUE_PUSH(&plist->conn, &conn->conn);
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  assert(!QUEUE_IS_EMPTY(&plist->conn));
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}
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static void cliAllocRecvBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf) {
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  SCliConn*    conn = handle->data;
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  SConnBuffer* pBuf = &conn->readBuf;
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  transAllocBuffer(pBuf, buf);
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}
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static void cliRecvCb(uv_stream_t* handle, ssize_t nread, const uv_buf_t* buf) {
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  // impl later
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  if (handle->data == NULL) {
    return;
  }
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  SCliConn*    conn = handle->data;
  SConnBuffer* pBuf = &conn->readBuf;
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  if (nread > 0) {
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    pBuf->len += nread;
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    if (transReadComplete(pBuf)) {
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      tTrace("%s cli conn %p read complete", CONN_GET_INST_LABEL(conn), conn);
      cliHandleResp(conn);
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    } else {
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      tTrace("%s cli conn %p read partial packet, continue to read", CONN_GET_INST_LABEL(conn), conn);
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    }
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    return;
  }
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  assert(nread <= 0);
  if (nread == 0) {
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    // ref http://docs.libuv.org/en/v1.x/stream.html?highlight=uv_read_start#c.uv_read_cb
    // nread might be 0, which does not indicate an error or EOF. This is equivalent to EAGAIN or EWOULDBLOCK under
    // read(2).
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    tTrace("%s cli conn %p read empty", CONN_GET_INST_LABEL(conn), conn);
512 513
    return;
  }
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  if (nread < 0) {
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    tError("%s cli conn %p read error: %s", CONN_GET_INST_LABEL(conn), conn, uv_err_name(nread));
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    conn->broken = true;
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    cliHandleExcept(conn);
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  }
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}
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static SCliConn* cliCreateConn(SCliThrdObj* pThrd) {
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  SCliConn* conn = taosMemoryCalloc(1, sizeof(SCliConn));
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  // read/write stream handle
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  conn->stream = (uv_stream_t*)taosMemoryMalloc(sizeof(uv_tcp_t));
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  uv_tcp_init(pThrd->loop, (uv_tcp_t*)(conn->stream));
  conn->stream->data = conn;

  conn->writeReq.data = conn;
  conn->connReq.data = conn;
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  transQueueInit(&conn->cliMsgs, NULL);
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  QUEUE_INIT(&conn->conn);
  conn->hostThrd = pThrd;
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  conn->status = ConnNormal;
  conn->broken = 0;
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  transRefCliHandle(conn);
  return conn;
}
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static void cliDestroyConn(SCliConn* conn, bool clear) {
  tTrace("%s cli conn %p remove from conn pool", CONN_GET_INST_LABEL(conn), conn);
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  QUEUE_REMOVE(&conn->conn);
  if (clear) {
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    uv_close((uv_handle_t*)conn->stream, cliDestroy);
545
  }
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}
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static void cliDestroy(uv_handle_t* handle) {
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  SCliConn* conn = handle->data;
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  taosMemoryFree(conn->ip);
  taosMemoryFree(conn->stream);
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  transCtxCleanup(&conn->ctx);
  transQueueDestroy(&conn->cliMsgs);
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  tTrace("%s cli conn %p destroy successfully", CONN_GET_INST_LABEL(conn), conn);
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  transDestroyBuffer(&conn->readBuf);
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  taosMemoryFree(conn);
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}
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static bool cliHandleNoResp(SCliConn* conn) {
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  bool res = false;
  if (!transQueueEmpty(&conn->cliMsgs)) {
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    SCliMsg* pMsg = transQueueGet(&conn->cliMsgs, 0);
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    if (REQUEST_NO_RESP(&pMsg->msg)) {
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      transQueuePop(&conn->cliMsgs);
      // taosArrayRemove(msgs, 0);
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      destroyCmsg(pMsg);
      res = true;
    }
    if (res == true) {
      if (cliMaySendCachedMsg(conn) == false) {
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        SCliThrdObj* thrd = conn->hostThrd;
        addConnToPool(thrd->pool, conn);
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      }
    }
  }
  return res;
}
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static void cliSendCb(uv_write_t* req, int status) {
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  SCliConn* pConn = req->data;
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  if (status == 0) {
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    tTrace("%s cli conn %p data already was written out", CONN_GET_INST_LABEL(pConn), pConn);
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  } else {
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    tError("%s cli conn %p failed to write: %s", CONN_GET_INST_LABEL(pConn), pConn, uv_err_name(status));
    cliHandleExcept(pConn);
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    return;
  }
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  if (cliHandleNoResp(pConn) == true) {
    tTrace("%s cli conn %p no resp required", CONN_GET_INST_LABEL(pConn), pConn);
    return;
  }
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  uv_read_start((uv_stream_t*)pConn->stream, cliAllocRecvBufferCb, cliRecvCb);
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}
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void cliSend(SCliConn* pConn) {
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  CONN_HANDLE_BROKEN(pConn);

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  // assert(taosArrayGetSize(pConn->cliMsgs) > 0);
  assert(!transQueueEmpty(&pConn->cliMsgs));
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  SCliMsg* pCliMsg = NULL;
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  CONN_GET_NEXT_SENDMSG(pConn);
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  pCliMsg->sent = 1;

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  STransConnCtx* pCtx = pCliMsg->ctx;
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  SCliThrdObj* pThrd = pConn->hostThrd;
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  STrans*      pTransInst = pThrd->pTransInst;
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  STransMsg* pMsg = (STransMsg*)(&pCliMsg->msg);
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  if (pMsg->pCont == 0) {
    pMsg->pCont = (void*)rpcMallocCont(0);
    pMsg->contLen = 0;
  }
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  int msgLen = transMsgLenFromCont(pMsg->contLen);
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  STransMsgHead* pHead = transHeadFromCont(pMsg->pCont);
  pHead->ahandle = pCtx != NULL ? (uint64_t)pCtx->ahandle : 0;
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  pHead->noResp = REQUEST_NO_RESP(pMsg) ? 1 : 0;
  pHead->persist = REQUEST_PERSIS_HANDLE(pMsg) ? 1 : 0;
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  pHead->msgType = pMsg->msgType;
  pHead->msgLen = (int32_t)htonl((uint32_t)msgLen);
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  pHead->release = REQUEST_RELEASE_HANDLE(pCliMsg) ? 1 : 0;
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  memcpy(pHead->user, pTransInst->user, strlen(pTransInst->user));
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  uv_buf_t wb = uv_buf_init((char*)pHead, msgLen);
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  tDebug("%s cli conn %p %s is send to %s:%d, local info %s:%d", CONN_GET_INST_LABEL(pConn), pConn,
         TMSG_INFO(pHead->msgType), taosInetNtoa(pConn->addr.sin_addr), ntohs(pConn->addr.sin_port),
         taosInetNtoa(pConn->locaddr.sin_addr), ntohs(pConn->locaddr.sin_port));
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  if (pHead->persist == 1) {
    CONN_SET_PERSIST_BY_APP(pConn);
  }
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  pConn->writeReq.data = pConn;
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  uv_write(&pConn->writeReq, (uv_stream_t*)pConn->stream, &wb, 1, cliSendCb);
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  return;
_RETURN:
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  return;
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}
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void cliConnCb(uv_connect_t* req, int status) {
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  // impl later
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  SCliConn* pConn = req->data;
  if (status != 0) {
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    tError("%s cli conn %p failed to connect server: %s", CONN_GET_INST_LABEL(pConn), pConn, uv_strerror(status));
    cliHandleExcept(pConn);
647
    return;
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  }
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  int addrlen = sizeof(pConn->addr);
  uv_tcp_getpeername((uv_tcp_t*)pConn->stream, (struct sockaddr*)&pConn->addr, &addrlen);

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  addrlen = sizeof(pConn->locaddr);
  uv_tcp_getsockname((uv_tcp_t*)pConn->stream, (struct sockaddr*)&pConn->locaddr, &addrlen);

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  tTrace("%s cli conn %p connect to server successfully", CONN_GET_INST_LABEL(pConn), pConn);
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  assert(pConn->stream == req->handle);
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  cliSend(pConn);
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}

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static void cliHandleQuit(SCliMsg* pMsg, SCliThrdObj* pThrd) {
  tDebug("cli work thread %p start to quit", pThrd);
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  destroyCmsg(pMsg);
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  destroyConnPool(pThrd->pool);
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  uv_timer_stop(&pThrd->timer);
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  uv_walk(pThrd->loop, cliWalkCb, NULL);

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  pThrd->quit = true;
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  // uv_stop(pThrd->loop);
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}
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static void cliHandleRelease(SCliMsg* pMsg, SCliThrdObj* pThrd) {
  SCliConn* conn = pMsg->msg.handle;
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  tDebug("%s cli conn %p start to release to inst", CONN_GET_INST_LABEL(conn), conn);
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  if (T_REF_VAL_GET(conn) == 2) {
    transUnrefCliHandle(conn);
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    if (!transQueuePush(&conn->cliMsgs, pMsg)) {
      return;
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    }
    cliSend(conn);
  } else {
    // conn already broken down
    transUnrefCliHandle(conn);
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  }
}
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SCliConn* cliGetConn(SCliMsg* pMsg, SCliThrdObj* pThrd) {
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  SCliConn* conn = NULL;
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  if (pMsg->msg.handle != NULL) {
    conn = (SCliConn*)(pMsg->msg.handle);
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    if (conn != NULL) {
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      tTrace("%s cli conn %p reused", CONN_GET_INST_LABEL(conn), conn);
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    }
  } else {
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    STransConnCtx* pCtx = pMsg->ctx;
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    conn = getConnFromPool(pThrd->pool, EPSET_GET_INUSE_IP(&pCtx->epSet), EPSET_GET_INUSE_PORT(&pCtx->epSet));
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    if (conn != NULL) {
      tTrace("%s cli conn %p get from conn pool", CONN_GET_INST_LABEL(conn), conn);
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    } else {
      tTrace("not found conn in conn pool %p", pThrd->pool);
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    }
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  }
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  return conn;
}
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void cliHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd) {
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  uint64_t et = taosGetTimestampUs();
  uint64_t el = et - pMsg->st;
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  tTrace("%s cli msg tran time cost: %" PRIu64 "us", ((STrans*)pThrd->pTransInst)->label, el);
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  STransConnCtx* pCtx = pMsg->ctx;
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  STrans*        pTransInst = pThrd->pTransInst;
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  SCliConn* conn = cliGetConn(pMsg, pThrd);
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  if (conn != NULL) {
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    conn->hThrdIdx = pCtx->hThrdIdx;
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    transCtxMerge(&conn->ctx, &pCtx->appCtx);
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    transQueuePush(&conn->cliMsgs, pMsg);
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    cliSend(conn);
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  } else {
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    conn = cliCreateConn(pThrd);
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    transCtxMerge(&conn->ctx, &pCtx->appCtx);
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    transQueuePush(&conn->cliMsgs, pMsg);
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    conn->hThrdIdx = pCtx->hThrdIdx;
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    conn->ip = strdup(EPSET_GET_INUSE_IP(&pCtx->epSet));
    conn->port = EPSET_GET_INUSE_PORT(&pCtx->epSet);
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    int ret = transSetConnOption((uv_tcp_t*)conn->stream);
    if (ret) {
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      tError("%s cli conn %p failed to set conn option, errmsg %s", pTransInst->label, conn, uv_err_name(ret));
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    }
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    int fd = taosCreateSocketWithTimeOutOpt(TRANS_CONN_TIMEOUT);
    if (fd == -1) {
      tTrace("%s cli conn %p failed to create socket", pTransInst->label, conn);
      cliHandleExcept(conn);
      return;
    }
    uv_tcp_open((uv_tcp_t*)conn->stream, fd);
742

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    struct sockaddr_in addr;
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    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = taosGetIpv4FromFqdn(conn->ip);
    addr.sin_port = (uint16_t)htons((uint16_t)conn->port);
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    tTrace("%s cli conn %p try to connect to %s:%d", pTransInst->label, conn, conn->ip, conn->port);
    ret = uv_tcp_connect(&conn->connReq, (uv_tcp_t*)(conn->stream), (const struct sockaddr*)&addr, cliConnCb);
    if (ret != 0) {
      tTrace("%s cli conn %p failed to connect to %s:%d, reason: %s", pTransInst->label, conn, conn->ip, conn->port,
             uv_err_name(ret));
      cliHandleExcept(conn);
      return;
    }
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  }
}
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static void cliAsyncCb(uv_async_t* handle) {
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  SAsyncItem*  item = handle->data;
  SCliThrdObj* pThrd = item->pThrd;
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  SCliMsg*     pMsg = NULL;
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  // batch process to avoid to lock/unlock frequently
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  queue wq;
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  taosThreadMutexLock(&item->mtx);
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  QUEUE_MOVE(&item->qmsg, &wq);
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  taosThreadMutexUnlock(&item->mtx);
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  int count = 0;
  while (!QUEUE_IS_EMPTY(&wq)) {
    queue* h = QUEUE_HEAD(&wq);
    QUEUE_REMOVE(h);
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    SCliMsg* pMsg = QUEUE_DATA(h, SCliMsg, q);
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    if (pMsg == NULL) {
      continue;
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    }
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    (*cliAsyncHandle[pMsg->type])(pMsg, pThrd);
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    count++;
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  }
  if (count >= 2) {
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    tTrace("cli process batch size: %d", count);
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  }
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}

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static void* cliWorkThread(void* arg) {
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  SCliThrdObj* pThrd = (SCliThrdObj*)arg;
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  setThreadName("trans-cli-work");
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  uv_run(pThrd->loop, UV_RUN_DEFAULT);
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  return NULL;
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}

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void* transInitClient(uint32_t ip, uint32_t port, char* label, int numOfThreads, void* fp, void* shandle) {
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  SCliObj* cli = taosMemoryCalloc(1, sizeof(SCliObj));
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  STrans* pTransInst = shandle;
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  memcpy(cli->label, label, strlen(label));
  cli->numOfThreads = numOfThreads;
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  cli->pThreadObj = (SCliThrdObj**)taosMemoryCalloc(cli->numOfThreads, sizeof(SCliThrdObj*));
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  for (int i = 0; i < cli->numOfThreads; i++) {
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    SCliThrdObj* pThrd = createThrdObj();
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    pThrd->nextTimeout = taosGetTimestampMs() + CONN_PERSIST_TIME(pTransInst->idleTime);
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    pThrd->pTransInst = shandle;
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    int err = taosThreadCreate(&pThrd->thread, NULL, cliWorkThread, (void*)(pThrd));
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    if (err == 0) {
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      tDebug("success to create tranport-cli thread %d", i);
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    }
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    cli->pThreadObj[i] = pThrd;
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  }
  return cli;
}
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static void destroyUserdata(STransMsg* userdata) {
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  if (userdata->pCont == NULL) {
    return;
  }
  transFreeMsg(userdata->pCont);
  userdata->pCont = NULL;
}
static void destroyCmsg(SCliMsg* pMsg) {
  if (pMsg == NULL) {
    return;
  }
  transDestroyConnCtx(pMsg->ctx);
  destroyUserdata(&pMsg->msg);
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  taosMemoryFree(pMsg);
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}
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static SCliThrdObj* createThrdObj() {
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  SCliThrdObj* pThrd = (SCliThrdObj*)taosMemoryCalloc(1, sizeof(SCliThrdObj));
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  QUEUE_INIT(&pThrd->msg);
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  taosThreadMutexInit(&pThrd->msgMtx, NULL);
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  pThrd->loop = (uv_loop_t*)taosMemoryMalloc(sizeof(uv_loop_t));
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  uv_loop_init(pThrd->loop);

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  pThrd->asyncPool = transCreateAsyncPool(pThrd->loop, 5, pThrd, cliAsyncCb);
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  uv_timer_init(pThrd->loop, &pThrd->timer);
  pThrd->timer.data = pThrd;
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  pThrd->pool = createConnPool(4);
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  transCreateDelayQueue(pThrd->loop, &pThrd->delayQueue);

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  pThrd->quit = false;
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  return pThrd;
}
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static void destroyThrdObj(SCliThrdObj* pThrd) {
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  if (pThrd == NULL) {
    return;
  }
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  taosThreadJoin(pThrd->thread, NULL);
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  CLI_RELEASE_UV(pThrd->loop);
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  taosThreadMutexDestroy(&pThrd->msgMtx);
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  transDestroyAsyncPool(pThrd->asyncPool);
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  transDestroyDelayQueue(pThrd->delayQueue);
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  taosMemoryFree(pThrd->loop);
  taosMemoryFree(pThrd);
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}
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static void transDestroyConnCtx(STransConnCtx* ctx) {
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  //
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  taosMemoryFree(ctx);
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}
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void cliSendQuit(SCliThrdObj* thrd) {
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  // cli can stop gracefully
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  SCliMsg* msg = taosMemoryCalloc(1, sizeof(SCliMsg));
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  msg->type = Quit;
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  transSendAsync(thrd->asyncPool, &msg->q);
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}
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void cliWalkCb(uv_handle_t* handle, void* arg) {
  if (!uv_is_closing(handle)) {
    uv_close(handle, NULL);
  }
}
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int cliRBChoseIdx(STrans* pTransInst) {
  int64_t index = pTransInst->index;
  if (pTransInst->index++ >= pTransInst->numOfThreads) {
    pTransInst->index = 0;
  }
  return index % pTransInst->numOfThreads;
}
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static void doDelayTask(void* param) {
  STaskArg* arg = param;

  SCliMsg*     pMsg = arg->param1;
  SCliThrdObj* pThrd = arg->param2;

  cliHandleReq(pMsg, pThrd);

  taosMemoryFree(arg);
}
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int cliAppCb(SCliConn* pConn, STransMsg* pResp, SCliMsg* pMsg) {
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  SCliThrdObj* pThrd = pConn->hostThrd;
  STrans*      pTransInst = pThrd->pTransInst;

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  if (pMsg == NULL || pMsg->ctx == NULL) {
    tTrace("%s cli conn %p handle resp", pTransInst->label, pConn);
    pTransInst->cfp(pTransInst->parent, pResp, NULL);
    return 0;
  }

  STransConnCtx* pCtx = pMsg->ctx;
  SEpSet*        pEpSet = &pCtx->epSet;
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  /*
   * upper layer handle retry if code equal TSDB_CODE_RPC_NETWORK_UNAVAIL
   */
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  tmsg_t msgType = pCtx->msgType;
  if ((pTransInst->retry != NULL && (pTransInst->retry(pResp->code))) ||
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      ((pResp->code == TSDB_CODE_RPC_NETWORK_UNAVAIL) && msgType == TDMT_MND_CONNECT)) {
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    pCtx->retryCount += 1;
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    pMsg->st = taosGetTimestampUs();
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    if (msgType == TDMT_MND_CONNECT && pResp->code == TSDB_CODE_RPC_NETWORK_UNAVAIL) {
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      if (pCtx->retryCount < pEpSet->numOfEps) {
        pEpSet->inUse = (++pEpSet->inUse) % pEpSet->numOfEps;
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        STaskArg* arg = taosMemoryMalloc(sizeof(STaskArg));
        arg->param1 = pMsg;
        arg->param2 = pThrd;
        transPutTaskToDelayQueue(pThrd->delayQueue, doDelayTask, arg, TRANS_RETRY_INTERVAL);

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        cliDestroy((uv_handle_t*)pConn->stream);
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        return -1;
      }
    } else if (pCtx->retryCount < TRANS_RETRY_COUNT_LIMIT) {
      if (pResp->contLen == 0) {
        pEpSet->inUse = (pEpSet->inUse++) % pEpSet->numOfEps;
      } else {
        SMEpSet emsg = {0};
        tDeserializeSMEpSet(pResp->pCont, pResp->contLen, &emsg);
        pCtx->epSet = emsg.epSet;
      }
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      STaskArg* arg = taosMemoryMalloc(sizeof(STaskArg));
      arg->param1 = pMsg;
      arg->param2 = pThrd;

      transPutTaskToDelayQueue(pThrd->delayQueue, doDelayTask, arg, TRANS_RETRY_INTERVAL);
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      addConnToPool(pThrd, pConn);
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      return -1;
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    }
  }

  if (pCtx->pSem != NULL) {
    tTrace("%s cli conn %p handle resp", pTransInst->label, pConn);
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    memcpy((char*)pCtx->pRsp, (char*)pResp, sizeof(*pResp));
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    tsem_post(pCtx->pSem);
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  } else {
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    tTrace("%s cli conn %p handle resp", pTransInst->label, pConn);
    pTransInst->cfp(pTransInst->parent, pResp, pEpSet);
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  }
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  return 0;
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}
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void transCloseClient(void* arg) {
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  SCliObj* cli = arg;
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  for (int i = 0; i < cli->numOfThreads; i++) {
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    cliSendQuit(cli->pThreadObj[i]);
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    destroyThrdObj(cli->pThreadObj[i]);
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  }
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  taosMemoryFree(cli->pThreadObj);
  taosMemoryFree(cli);
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}
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void transRefCliHandle(void* handle) {
  if (handle == NULL) {
    return;
  }
  int ref = T_REF_INC((SCliConn*)handle);
  UNUSED(ref);
}
void transUnrefCliHandle(void* handle) {
  if (handle == NULL) {
    return;
  }
  int ref = T_REF_DEC((SCliConn*)handle);
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  tDebug("%s cli conn %p ref %d", CONN_GET_INST_LABEL((SCliConn*)handle), handle, ref);
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  if (ref == 0) {
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    cliDestroyConn((SCliConn*)handle, true);
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  }
}
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void transReleaseCliHandle(void* handle) {
  SCliThrdObj* thrd = CONN_GET_HOST_THREAD(handle);
  if (thrd == NULL) {
    return;
  }

  STransMsg tmsg = {.handle = handle};
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  SCliMsg*  cmsg = taosMemoryCalloc(1, sizeof(SCliMsg));
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  cmsg->msg = tmsg;
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  cmsg->type = Release;
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  transSendAsync(thrd->asyncPool, &cmsg->q);
}
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void transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransCtx* ctx) {
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  STrans* pTransInst = (STrans*)shandle;
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  int     index = CONN_HOST_THREAD_INDEX((SCliConn*)pReq->handle);
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  if (index == -1) {
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    index = cliRBChoseIdx(pTransInst);
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  }
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  STransConnCtx* pCtx = taosMemoryCalloc(1, sizeof(STransConnCtx));
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  pCtx->epSet = *pEpSet;
  pCtx->ahandle = pReq->ahandle;
  pCtx->msgType = pReq->msgType;
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  pCtx->hThrdIdx = index;
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  if (ctx != NULL) {
    pCtx->appCtx = *ctx;
  }
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  assert(pTransInst->connType == TAOS_CONN_CLIENT);
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  SCliMsg* cliMsg = taosMemoryCalloc(1, sizeof(SCliMsg));
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  cliMsg->ctx = pCtx;
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  cliMsg->msg = *pReq;
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  cliMsg->st = taosGetTimestampUs();
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  cliMsg->type = Normal;
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  SCliThrdObj* thrd = ((SCliObj*)pTransInst->tcphandle)->pThreadObj[index];
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  tDebug("send request at thread:%d %p, dst: %s:%d, app:%p", index, pReq, EPSET_GET_INUSE_IP(&pCtx->epSet),
         EPSET_GET_INUSE_PORT(&pCtx->epSet), pReq->ahandle);
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  ASSERT(transSendAsync(thrd->asyncPool, &(cliMsg->q)) == 0);
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}
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void transSendRecv(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransMsg* pRsp) {
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  STrans* pTransInst = (STrans*)shandle;
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  int     index = CONN_HOST_THREAD_INDEX(pReq->handle);
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  if (index == -1) {
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    index = cliRBChoseIdx(pTransInst);
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  }

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  STransConnCtx* pCtx = taosMemoryCalloc(1, sizeof(STransConnCtx));
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  pCtx->epSet = *pEpSet;
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  pCtx->ahandle = pReq->ahandle;
  pCtx->msgType = pReq->msgType;
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  pCtx->hThrdIdx = index;
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  pCtx->pSem = taosMemoryCalloc(1, sizeof(tsem_t));
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  pCtx->pRsp = pRsp;
  tsem_init(pCtx->pSem, 0, 0);

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  SCliMsg* cliMsg = taosMemoryCalloc(1, sizeof(SCliMsg));
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  cliMsg->ctx = pCtx;
  cliMsg->msg = *pReq;
  cliMsg->st = taosGetTimestampUs();
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  cliMsg->type = Normal;
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  SCliThrdObj* thrd = ((SCliObj*)pTransInst->tcphandle)->pThreadObj[index];
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  tDebug("send request at thread:%d %p, dst: %s:%d, app:%p", index, pReq, EPSET_GET_INUSE_IP(&pCtx->epSet),
         EPSET_GET_INUSE_PORT(&pCtx->epSet), pReq->ahandle);

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  transSendAsync(thrd->asyncPool, &(cliMsg->q));
  tsem_t* pSem = pCtx->pSem;
  tsem_wait(pSem);
  tsem_destroy(pSem);
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  taosMemoryFree(pSem);
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}
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#endif