Merge pull request #179 from StoneT2000/master

Update docs within files, better naming, and added some async functionality

.gitignore

@@ -11,3 +11,5 @@ debs/
 rpms/
 *.pyc
 *.tmp
+src/connector/nodejs/node_modules/
+src/connector/nodejs/out/

src/connector/nodejs/nodetaos/cinterface.js

+/**
+ * C Interface with TDengine Module
+ * @module CTaosInterface
+ */
+
 const ref = require('ref');
 const ffi = require('ffi');
 const ArrayType = require('ref-array');
 const Struct = require('ref-struct');
-const fieldTypes = require('./constants');
+const FieldTypes = require('./constants');
 const errors = require ('./error')
 
 module.exports = CTaosInterface;
@@ -145,18 +150,18 @@ function convertNchar(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
   return res;
 }
 
-//Object with all the relevant converters from pblock data to javascript data
+// Object with all the relevant converters from pblock data to javascript readable data
 let convertFunctions = {
-    [fieldTypes.C_BOOL] : convertBool,
-    [fieldTypes.C_TINYINT] : convertTinyint,
-    [fieldTypes.C_SMALLINT] : convertSmallint,
-    [fieldTypes.C_INT] : convertInt,
-    [fieldTypes.C_BIGINT] : convertBigint,
-    [fieldTypes.C_FLOAT] : convertFloat,
-    [fieldTypes.C_DOUBLE] : convertDouble,
-    [fieldTypes.C_BINARY] : convertBinary,
-    [fieldTypes.C_TIMESTAMP] : convertTimestamp,
-    [fieldTypes.C_NCHAR] : convertNchar
+    [FieldTypes.C_BOOL] : convertBool,
+    [FieldTypes.C_TINYINT] : convertTinyint,
+    [FieldTypes.C_SMALLINT] : convertSmallint,
+    [FieldTypes.C_INT] : convertInt,
+    [FieldTypes.C_BIGINT] : convertBigint,
+    [FieldTypes.C_FLOAT] : convertFloat,
+    [FieldTypes.C_DOUBLE] : convertDouble,
+    [FieldTypes.C_BINARY] : convertBinary,
+    [FieldTypes.C_TIMESTAMP] : convertTimestamp,
+    [FieldTypes.C_NCHAR] : convertNchar
 }
 
 // Define TaosField structure
@@ -168,7 +173,12 @@ TaosField.fields.name.type.size = 64;
 TaosField.defineProperty('bytes', ref.types.short);
 TaosField.defineProperty('type', ref.types.char);
 
-//The C interface with the Taos TSDB
+/**
+ * Constructor for the C interface with TDengine
+ * @constructor
+ * @param {Object} config - Configuration options for the interface
+ * @return {CTaosInterface}
+ */
 function CTaosInterface (config = null, pass = false) {
   ref.types.char_ptr = ref.refType(ref.types.char);
   ref.types.void_ptr = ref.refType(ref.types.void);
@@ -208,7 +218,7 @@ function CTaosInterface (config = null, pass = false) {
     }
     else {
       try {
-        this._config = ref.allocCString(config);;
+        this._config = ref.allocCString(config);
       }
       catch(err){
         throw "Attribute Error: config is expected as a str";
@@ -219,6 +229,7 @@ function CTaosInterface (config = null, pass = false) {
     }
     this.libtaos.taos_init();
   }
+  return this;
 }
 CTaosInterface.prototype.config = function config() {
     return this._config;
@@ -298,7 +309,7 @@ CTaosInterface.prototype.fetchBlock = function fetchBlock(result, fields) {
   if (num_of_rows == 0) {
     return {block:null, num_of_rows:0};
   }
-  let isMicro = (this.libtaos.taos_result_precision(result) == fieldTypes.C_TIMESTAMP_MICRO)
+  let isMicro = (this.libtaos.taos_result_precision(result) == FieldTypes.C_TIMESTAMP_MICRO)
   let blocks = new Array(fields.length);
   blocks.fill(null);
   num_of_rows = Math.abs(num_of_rows);

src/connector/nodejs/nodetaos/connection.js

@@ -2,11 +2,14 @@ const TDengineCursor = require('./cursor')
 const CTaosInterface = require('./cinterface')
 module.exports = TDengineConnection;
 
-/*
- * TDengine Connection object
- * @param {Object.<string, string>} options - Options for configuring the connection with TDengine
+/**
+ * TDengine Connection Class
+ * @param {object} options - Options for configuring the connection with TDengine
  * @return {TDengineConnection}
- *
+ * @class TDengineConnection
+ * @constructor
+ * @example
+ * var conn = new TDengineConnection({host:"127.0.0.1", user:"root", password:"taosdata", config:"/etc/taos",port:0})
  *
  */
 function TDengineConnection(options) {
@@ -18,11 +21,15 @@ function TDengineConnection(options) {
   this._port = 0;
   this._config = null;
   this._chandle = null;
-  this.config(options)
+  this._configConn(options)
   return this;
 }
-
-TDengineConnection.prototype.config = function config(options) {
+/**
+ * Configure the connection to TDengine
+ * @private
+ * @memberof TDengineConnection
+ */
+TDengineConnection.prototype._configConn = function _configConn(options) {
   if (options['host']) {
     this._host = options['host'];
   }
@@ -44,10 +51,14 @@ TDengineConnection.prototype.config = function config(options) {
   this._chandle = new CTaosInterface(this._config);
   this._conn = this._chandle.connect(this._host, this._user, this._password, this._database, this._port);
 }
-
+/** Close the connection to TDengine */
 TDengineConnection.prototype.close = function close() {
-  return this._chandle.close(this._conn);
+  this._chandle.close(this._conn);
 }
+/**
+ * Initialize a new cursor to interact with TDengine with
+ * @return {TDengineCursor}
+ */
 TDengineConnection.prototype.cursor = function cursor() {
   //Pass the connection object to the cursor
   return new TDengineCursor(this);
@@ -58,7 +69,11 @@ TDengineConnection.prototype.commit = function commit() {
 TDengineConnection.prototype.rollback = function rollback() {
   return this;
 }
-TDengineConnection.prototype.clear_result_set = function clear_result_set() {
+/**
+ * Clear the results from connector
+ * @private
+ */
+TDengineConnection.prototype._clearResultSet = function _clearResultSet() {
   var result = this._chandle.useResult(this._conn).result;
   if (result) {
     this._chandle.freeResult(result)

src/connector/nodejs/nodetaos/constants.js

-/*
- * TDengine Field Types
+/**
+ * TDengine Field Types and their type codes
+ * @typedef {Object} FieldTypes
+ * @property {number} C_NULL - Null
+ * @property {number} C_BOOL - Boolean. Note, 0x02 is the C_BOOL_NULL value.
+ * @property {number} C_TINYINT - Tiny Int, values in the range [-2^7+1, 2^7-1]. Note, -2^7 has been used as the C_TINYINT_NULL value
+ * @property {number} C_SMALLINT - Small Int, values in the range [-2^15+1, 2^15-1]. Note, -2^15 has been used as the C_SMALLINT_NULL value
+ * @property {number} C_INT - Int, values in the range [-2^31+1, 2^31-1]. Note, -2^31 has been used as the C_INT_NULL value
+ * @property {number} C_BIGINT - Big Int, values in the range [-2^59, 2^59].
+ * @property {number} C_FLOAT - Float, values in the range [-3.4E38, 3.4E38], accurate up to 6-7 decimal places.
+ * @property {number} C_DOUBLE - Double, values in the range [-1.7E308, 1.7E308], accurate up to 15-16 decimal places.
+ * @property {number} C_BINARY - Binary, encoded in utf-8.
+ * @property {number} C_TIMESTAMP - Timestamp in format "YYYY:MM:DD HH:MM:SS.MMM". Measured in number of milliseconds passed after
+                                    1970-01-01 08:00:00.000 GMT.
+ * @property {number} C_NCHAR - NChar field type encoded in ASCII, a wide string.
  *
  *
+ *
+ * @property {number} C_TIMESTAMP_MILLI - The code for millisecond timestamps, as returned by libtaos.taos_result_precision(result).
+ * @property {number} C_TIMESTAMP_MICRO - The code for microsecond timestamps, as returned by libtaos.taos_result_precision(result).
  */
 module.exports = {
-    // Type Code
     C_NULL : 0,
     C_BOOL : 1,
     C_TINYINT : 2,
@@ -23,7 +38,10 @@ module.exports = {
     C_SMALLINT_NULL : -32768,
     C_INT_NULL : -2147483648,
     C_BIGINT_NULL : -9223372036854775808,
-
+    C_FLOAT_NULL : 2146435072,
+    C_DOUBLE_NULL : -9223370937343148032,
+    C_NCHAR_NULL : 4294967295,
+    C_BINARY_NULL : 255,
     C_TIMESTAMP_MILLI : 0,
     C_TIMESTAMP_MICRO : 1,
 }

src/connector/nodejs/nodetaos/cursor.js

 const CTaosInterface = require('./cinterface')
 const errors = require ('./error')
+const TaosQuery = require('./taosquery')
 module.exports = TDengineCursor;
 
+/**
+ * Constructor for a TDengine Cursor
+ * @class TDengineCursor
+ * @constructor
+ * @param {TDengineConnection} - The TDengine Connection this cursor uses to interact with TDengine
+ * @property {data} - Latest retrieved data from query execution. It is an empty array by default
+ * @property {fieldNames} - Array of the field names in order from left to right of the latest data retrieved
+ */
 function TDengineCursor(connection=null) {
   this._description = null;
   this._rowcount = -1;
   this._connection = null;
   this._result = null;
   this._fields = null;
-  this.data = null;
+  this.data = [];
   this.fieldNames = null;
-  this.chandle = new CTaosInterface(null, true); //pass through, just need library loaded.
+  this._chandle = new CTaosInterface(null, true); //pass through, just need library loaded.
   if (connection != null) {
     this._connection = connection
   }
 
 }
+/**
+ * Get the description of the latest query
+ * @return {string} Description
+ */
 TDengineCursor.prototype.description = function description() {
   return this._description;
 }
+/**
+ * Get the row counts of the latest query
+ * @return {number} Rowcount
+ */
 TDengineCursor.prototype.rowcount = function rowcount() {
   return this._rowcount;
 }
 TDengineCursor.prototype.callproc = function callproc() {
   return;
 }
+/**
+ * Close the cursor by setting its connection to null and freeing results from the connection and resetting the results it has stored
+ * @return {boolean} Whether or not the cursor was succesfully closed
+ */
 TDengineCursor.prototype.close = function close() {
   if (this._connection == null) {
     return false;
   }
-  this._connection.clear_result_set();
+  this._connection._clearResultSet();
   this._reset_result();
   this._connection = null;
   return true;
 }
-TDengineCursor.prototype.execute = function execute(operation, params=null) {
+/**
+ *
+ * @return {TaosQuery} - A TaosQuery object
+ */
+TDengineCursor.prototype.query = function query(operation) {
+  return new TaosQuery(operation, this);
+}
+
+/**
+ * Execute a query. Also stores all the field names returned from the query into cursor.fieldNames;
+ * @param {string} operation -  The query operation to execute in the taos shell
+ * @param {number} verbose - A verbosity of 0 silences any logs from this function. A verbosity of 1 means this function will log query statues
+ * @return {number | buffer} Number of affected rows or a buffer that points to the results of the query
+ */
+TDengineCursor.prototype.execute = function execute(operation, verbose) {
   if (operation == undefined) {
     return null;
   }
   if (this._connection == null) {
     throw new errors.ProgrammingError('Cursor is not connected');
   }
-  this._connection.clear_result_set();
+  this._connection._clearResultSet();
   this._reset_result();
 
   let stmt = operation;
-  if (params != null) {
-    //why pass?
-  }
-  res = this.chandle.query(this._connection._conn, stmt);
+  res = this._chandle.query(this._connection._conn, stmt);
   if (res == 0) {
-    let fieldCount = this.chandle.fieldsCount(this._connection._conn);
+    let fieldCount = this._chandle.fieldsCount(this._connection._conn);
     if (fieldCount == 0) {
-      return this.chandle.affectedRows(this._connection._conn); //return num of affected rows, common with insert, use statements
+      let response = "Query OK"
+      return this._chandle.affectedRows(this._connection._conn); //return num of affected rows, common with insert, use statements
     }
     else {
-      let resAndField = this.chandle.useResult(this._connection._conn, fieldCount)
+      let resAndField = this._chandle.useResult(this._connection._conn, fieldCount)
       this._result = resAndField.result;
       this._fields = resAndField.fields;
       this.fieldNames = resAndField.fields.map(fieldData => fieldData.name);
-      return this._handle_result(); //return a pointer
+      return this._handle_result(); //return a pointer to the result
     }
   }
   else {
-    throw new errors.ProgrammingError(this.chandle.errStr(this._connection._conn))
+    throw new errors.ProgrammingError(this._chandle.errStr(this._connection._conn))
   }
 
-
 }
 TDengineCursor.prototype.executemany = function executemany() {
 
@@ -77,6 +109,15 @@ TDengineCursor.prototype.fetchone = function fetchone() {
 TDengineCursor.prototype.fetchmany = function fetchmany() {
 
 }
+/**
+ * Fetches all results from a query and also stores results into cursor.data
+ *
+ * @return {Array<Row>} The resultant array, with entries corresponding to each retreived row from the query results, sorted in
+ * order by the field name ordering in the table.
+ * @example
+ * cursor.execute('select * from db.table');
+ * var data = cursor.fetchall()
+ */
 TDengineCursor.prototype.fetchall = function fetchall() {
   if (this._result == null || this._fields == null) {
     throw new errors.OperationalError("Invalid use of fetchall, either result or fields from query are null");
@@ -86,7 +127,7 @@ TDengineCursor.prototype.fetchall = function fetchall() {
   let k = 0;
   while(true) {
     k+=1;
-    let blockAndRows = this.chandle.fetchBlock(this._result, this._fields);
+    let blockAndRows = this._chandle.fetchBlock(this._result, this._fields);
     let block = blockAndRows.blocks;
     let num_of_rows = blockAndRows.num_of_rows;
 
@@ -101,9 +142,9 @@ TDengineCursor.prototype.fetchall = function fetchall() {
       }
     }
   }
-  this._connection.clear_result_set();
+  this._connection._clearResultSet();
   this.data = data;
-  return data; //data[i]  returns the ith row, with all the data
+  return data;
 }
 TDengineCursor.prototype.nextset = function nextset() {
   return;
@@ -119,7 +160,7 @@ TDengineCursor.prototype._reset_result = function _reset_result() {
   this._rowcount = -1;
   this._result = null;
   this._fields = null;
-  this.data = null;
+  this.data = [];
   this.fieldNames = null;
 }
 TDengineCursor.prototype._handle_result = function _handle_result() {

src/connector/nodejs/nodetaos/taosquery.js

+module.exports = TaosQuery;
+
+
+/**
+ * Constructor for TaosQuery object
+ * @class TaosQuery
+ * @constructor
+ * @param {string} query - Query to construct object from
+ * @param {TDengineCursor} - The cursor from which this query will execute from
+ */
+function TaosQuery(query = "", cursor = null) {
+  this._query = query;
+  this._cursor = cursor;
+}
+
+/**
+ * Executes the query object and returns a Promise object
+ * @memberof TaosQuery
+ * @param {function} resultCallback - A callback function that takes the results as input
+ * @param {function} metaCallback - A callback function that takes the metadata or fields as input
+ * @return {Promise<results, fields>} A promise that evaluates into an object with keys "results" and "fields"
+ */
+TaosQuery.prototype.execute = async function execute(resultCallback, metaCallback) {
+  var taosQuery = this; //store the current instance of taosQuery to avoid async issues?
+  var executionPromise = new Promise(function(resolve, reject) {
+    let results = [];
+    try {
+      taosQuery._cursor.execute(taosQuery._query);
+      if (taosQuery._cursor._result != null){
+        results = taosQuery._cursor.fetchall();
+      }
+      if (metaCallback) metaCallback(taosQuery._cursor._fields);
+      if (resultCallback) resultCallback(results);
+    }
+    catch(err) {
+      reject(err);
+    }
+    resolve({results:results, fields:taosQuery._cursor._fields})
+
+  });
+  return executionPromise;
+}
+
+/**
+ *
+ * @param {...args} args - A
+ */
+TaosQuery.prototype.bind = function bind(...args) {
+  args.forEach(function(arg) {
+
+  });
+}

src/connector/nodejs/nodetaos/taosresult.js

+/**
+ * TaosResult
+ * @module TaosResult
+ */
+
+ module.exports = TaosResult;
+/**
+ * Constructor for a TaosResult object;
+ * @class TaosResult
+ * @constructor
+ * @param {Array<Row>} - Array of result rows
+ * @param {Array<Field>} - Array of field meta data
+ * @return {TaosResult}
+ */
+function TaosResult(result, fields) {
+  this.result = result;
+  this.rowcount = this.result.length;
+  this.fields = parseFields(fields);
+}
+
+TaosResult.prototype.parseFields = function parseFields(fields) {
+  fields.map(function(field) {
+    return {}
+  })
+}

src/connector/nodejs/package-lock.json

 {
-  "name": "tdconnector",
+  "name": "td-connector",
   "version": "1.0.5",
   "lockfileVersion": 1,
   "requires": true,
@@ -144,22 +144,6 @@
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
-    "ctypes": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/ctypes/-/ctypes-0.0.1.tgz",
-      "integrity": "sha1-/C7F5ZmRwG9mNksh7yxy/SkQnLE=",
-      "requires": {
-        "array-index": "^1.0.0",
-        "debug": "^2.2.0",
-        "es6-weak-map": "^2.0.1",
-        "ffi": "^2.0.0",
-        "function-class": "^1.1.0",
-        "ref": "^1.3.1",
-        "ref-array": "^1.1.2",
-        "ref-struct": "^1.0.2",
-        "setprototypeof": "^1.0.0"
-      }
-    },
     "d": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/d/-/d-1.0.1.tgz",
@@ -238,17 +222,6 @@
         "es5-ext": "~0.10.14"
       }
     },
-    "es6-weak-map": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/es6-weak-map/-/es6-weak-map-2.0.3.tgz",
-      "integrity": "sha512-p5um32HOTO1kP+w7PRnB+5lQ43Z6muuMuIMffvDN8ZB4GcnjLBV6zGStpbASIMk4DCAvEaamhe2zhyCb/QXXsA==",
-      "requires": {
-        "d": "1",
-        "es5-ext": "^0.10.46",
-        "es6-iterator": "^2.0.3",
-        "es6-symbol": "^3.1.1"
-      }
-    },
     "extend": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
@@ -321,25 +294,6 @@
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
-    "function-class": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/function-class/-/function-class-1.1.0.tgz",
-      "integrity": "sha1-yCK8J5x4py11je/y4kzXwPtYWLo=",
-      "requires": {
-        "es6-symbol": "^3.0.2",
-        "function-name": "^1.0.0",
-        "setprototypeof": "^1.0.0"
-      }
-    },
-    "function-name": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/function-name/-/function-name-1.0.0.tgz",
-      "integrity": "sha1-r+4YP9eh3JIi1fZae/htpYNd90U=",
-      "requires": {
-        "bindings": "^1.2.1",
-        "nan": "2"
-      }
-    },
     "gauge": {
       "version": "2.7.4",
       "resolved": "https://registry.npmjs.org/gauge/-/gauge-2.7.4.tgz",
@@ -737,11 +691,6 @@
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
       "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
     },
-    "setprototypeof": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
-      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
-    },
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
@@ -845,11 +794,6 @@
         "punycode": "^2.1.0"
       }
     },
-    "utf8": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/utf8/-/utf8-3.0.0.tgz",
-      "integrity": "sha512-E8VjFIQ/TyQgp+TZfS6l8yp/xWppSAHzidGiRrqe4bK4XP9pTRyKFgGJpO3SN7zdX4DeomTrwaseCHovfpFcqQ=="
-    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",

src/connector/nodejs/readme.md

 # TDengine Node.js connector
+[![minzip](https://img.shields.io/bundlephobia/minzip/td-connector.svg)](https://github.com/taosdata/TDengine/tree/master/src/connector/nodejs) [![NPM](https://img.shields.io/npm/l/td-connector.svg)](https://github.com/taosdata/TDengine/#what-is-tdengine)
+
 This is the Node.js library that lets you connect to [TDengine](https://www.github.com/taosdata/tdengine).
 
 ## Installation
@@ -9,7 +11,7 @@ To get started, just type in the following to install the connector through [npm
 npm install td-connector
 ```
 
-To interact with TDengine, we make use of the [node-gyp[(https://github.com/nodejs/node-gyp)] library. To install, you will need to install the following depending on platform (the following instructions are quoted from node-gyp)
+To interact with TDengine, we make use of the [node-gyp](https://github.com/nodejs/node-gyp) library. To install, you will need to install the following depending on platform (the following instructions are quoted from node-gyp)
 
 ### On Unix