MilvusApi.h

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#pragma once

#include "Status.h"

#include <memory>
#include <string>
#include <vector>

/** \brief Milvus SDK namespace
 */
namespace milvus {

/**
 * @brief Index Type
 */
enum class IndexType {
    INVALID = 0,
    FLAT = 1,
    IVFFLAT = 2,
    IVFSQ8 = 3,
    RNSG = 4,
    IVFSQ8H = 5,
    IVFPQ = 6,
    SPTAGKDT = 7,
    SPTAGBKT = 8,
};

enum class MetricType {
    L2 = 1,         // Euclidean Distance
    IP = 2,         // Cosine Similarity
    HAMMING = 3,    // Hamming Distance
    JACCARD = 4,    // Jaccard Distance
    TANIMOTO = 5,   // Tanimoto Distance
};

/**
 * @brief Connect API parameter
 */
struct ConnectParam {
    std::string ip_address;  ///< Server IP address
    std::string port;        ///< Server PORT
};

/**
 * @brief Table Schema
 */
struct TableSchema {
    std::string table_name;                   ///< Table name
    int64_t dimension = 0;                    ///< Vector dimension, must be a positive value
    int64_t index_file_size = 0;              ///< Index file size, must be a positive value
    MetricType metric_type = MetricType::L2;  ///< Index metric type
};

/**
 * @brief Range information
 * for DATE range, the format is like: 'year-month-day'
 */
struct Range {
    std::string start_value;  ///< Range start
    std::string end_value;    ///< Range stop
};

/**
 * @brief Record inserted
 */
struct RowRecord {
    std::vector<float> float_data;  ///< Vector raw float data
    std::vector<uint8_t> binary_data;  ///< Vector raw binary data
};

/**
 * @brief TopK query result
 */
struct QueryResult {
    std::vector<int64_t> ids;      ///< Query ids result
    std::vector<float> distances;  ///< Query distances result
};
using TopKQueryResult = std::vector<QueryResult>;  ///< Topk query result

/**
 * @brief index parameters
 */
struct IndexParam {
    std::string table_name;  ///< Table name for create index
    IndexType index_type;    ///< Create index type
    int32_t nlist;           ///< Index nlist
};

/**
 * @brief partition parameters
 */
struct PartitionParam {
    std::string table_name;
    std::string partition_name;
    std::string partition_tag;
};

using PartitionList = std::vector<PartitionParam>;

/**
 * @brief SDK main class
 */
class Connection {
 public:
    /**
     * @brief CreateConnection
     *
     * Create a connection instance and return it's shared pointer
     *
     * @return Connection instance pointer
     */

    static std::shared_ptr<Connection>
    Create();

    /**
     * @brief DestroyConnection
     *
     * Destroy the connection instance
     *
     * @param connection, the shared pointer to the instance to be destroyed
     *
     * @return if destroy is successful
     */

    static Status
    Destroy(std::shared_ptr<Connection>& connection_ptr);

    /**
     * @brief Connect
     *
     * This method is used to connect server.
     * Connect function should be called before any operations.
     *
     * @param param, use to provide server information
     *
     * @return Indicate if connect is successful
     */

    virtual Status
    Connect(const ConnectParam& param) = 0;

    /**
     * @brief Connect
     *
     * This method is used to connect server.
     * Connect function should be called before any operations.
     *
     * @param uri, use to provide server uri, example: milvus://ipaddress:port
     *
     * @return Indicate if connect is successful
     */
    virtual Status
    Connect(const std::string& uri) = 0;

    /**
     * @brief connected
     *
     * This method is used to test whether server is connected.
     *
     * @return Indicate if connection status
     */
    virtual Status
    Connected() const = 0;

    /**
     * @brief Disconnect
     *
     * This method is used to disconnect server.
     *
     * @return Indicate if disconnect is successful
     */
    virtual Status
    Disconnect() = 0;

    /**
     * @brief Create table method
     *
     * This method is used to create table.
     *
     * @param param, use to provide table information to be created.
     *
     * @return Indicate if table is created successfully
     */
    virtual Status
    CreateTable(const TableSchema& param) = 0;

    /**
     * @brief Test table existence method
     *
     * This method is used to create table.
     *
     * @param table_name, target table's name.
     *
     * @return Indicate if table is cexist
     */
    virtual bool
    HasTable(const std::string& table_name) = 0;

    /**
     * @brief Drop table method
     *
     * This method is used to drop table(and its partitions).
     *
     * @param table_name, target table's name.
     *
     * @return Indicate if table is drop successfully.
     */
    virtual Status
    DropTable(const std::string& table_name) = 0;

    /**
     * @brief Create index method
     *
     * This method is used to create index for whole table(and its partitions).
     *
     * @param IndexParam
     *  table_name, table name is going to be create index.
     *  index type,
     *  nlist,
     *  index file size
     *
     * @return Indicate if build index successfully.
     */
    virtual Status
    CreateIndex(const IndexParam& index_param) = 0;

    /**
     * @brief Insert vector to table
     *
     * This method is used to insert vector array to table.
     *
     * @param table_name, target table's name.
     * @param partition_tag, target partition's tag, keep empty if no partition.
     * @param record_array, vector array is inserted.
     * @param id_array,
     *  specify id for each vector,
     *  if this array is empty, milvus will generate unique id for each vector,
     *  and return all ids by this parameter.
     *
     * @return Indicate if vector array are inserted successfully
     */
    virtual Status
    Insert(const std::string& table_name, const std::string& partition_tag, const std::vector<RowRecord>& record_array,
           std::vector<int64_t>& id_array) = 0;

    /**
     * @brief Search vector
     *
     * This method is used to query vector in table.
     *
     * @param table_name, target table's name.
     * @param partition_tags, target partitions, keep empty if no partition.
     * @param query_record_array, all vector are going to be queried.
     * @param query_range_array, [deprecated] time ranges, if not specified, will search in whole table
     * @param topk, how many similarity vectors will be searched.
     * @param nprobe, the number of centroids choose to search.
     * @param topk_query_result_array, result array.
     *
     * @return Indicate if query is successful.
     */
    virtual Status
    Search(const std::string& table_name, const std::vector<std::string>& partition_tags,
           const std::vector<RowRecord>& query_record_array, const std::vector<Range>& query_range_array, int64_t topk,
           int64_t nprobe, TopKQueryResult& topk_query_result) = 0;

    /**
     * @brief Show table description
     *
     * This method is used to show table information.
     *
     * @param table_name, target table's name.
     * @param table_schema, table_schema is given when operation is successful.
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    DescribeTable(const std::string& table_name, TableSchema& table_schema) = 0;

    /**
     * @brief Get table row count
     *
     * This method is used to get table row count.
     *
     * @param table_name, target table's name.
     * @param row_count, table total row count(including partitions).
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    CountTable(const std::string& table_name, int64_t& row_count) = 0;

    /**
     * @brief Show all tables in database
     *
     * This method is used to list all tables.
     *
     * @param table_array, all tables in database.
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    ShowTables(std::vector<std::string>& table_array) = 0;

    /**
     * @brief Give the client version
     *
     * This method is used to give the client version.
     *
     * @return Client version.
     */
    virtual std::string
    ClientVersion() const = 0;

    /**
     * @brief Give the server version
     *
     * This method is used to give the server version.
     *
     * @return Server version.
     */
    virtual std::string
    ServerVersion() const = 0;

    /**
     * @brief Give the server status
     *
     * This method is used to give the server status.
     *
     * @return Server status.
     */
    virtual std::string
    ServerStatus() const = 0;

    /**
     * @brief dump server tasks information
     *
     * This method is internal used.
     *
     * @return Task information in tasktables.
     */
    virtual std::string
    DumpTaskTables() const = 0;

    /**
     * [deprecated]
     * @brief delete tables by date range
     *
     * This method is used to delete table data by date range.
     *
     * @param table_name, target table's name.
     * @param Range, table range to delete.
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    DeleteByDate(const std::string& table_name, const Range& range) = 0;

    /**
     * @brief preload table
     *
     * This method is used to preload table
     *
     * @param table_name
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    PreloadTable(const std::string& table_name) const = 0;

    /**
     * @brief describe index
     *
     * This method is used to describe index
     *
     * @param table_name, target table's name.
     * @param index_param, returned index information.
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    DescribeIndex(const std::string& table_name, IndexParam& index_param) const = 0;

    /**
     * @brief drop index
     *
     * This method is used to drop index of table(and its partitions)
     *
     * @param table_name, target table's name.
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    DropIndex(const std::string& table_name) const = 0;

    /**
     * @brief Create partition method
     *
     * This method is used to create table partition
     *
     * @param param, use to provide partition information to be created.
     *
     * @return Indicate if partition is created successfully
     */
    virtual Status
    CreatePartition(const PartitionParam& param) = 0;

    /**
     * @brief Test table existence method
     *
     * This method is used to create table
     *
     * @param table_name, table name is going to be tested.
     * @param partition_array, partition array of the table.
     *
     * @return Indicate if this operation is successful
     */
    virtual Status
    ShowPartitions(const std::string& table_name, PartitionList& partition_array) const = 0;

    /**
     * @brief Delete partition method
     *
     * This method is used to delete table partition.
     *
     * @param param, target partition to be deleted.
     *      NOTE: if param.table_name is empty, you must specify param.partition_name,
     *          else you can specify param.table_name and param.tag and let the param.partition_name be empty
     *
     * @return Indicate if partition is delete successfully.
     */
    virtual Status
    DropPartition(const PartitionParam& param) = 0;

    /**
     * @brief Get config method
     *
     * This method is used to set config.
     *
     * @param node_name, config node name.
     * @param value, config value.
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    GetConfig(const std::string& node_name, std::string& value) const = 0;

    /**
     * @brief Set config method
     *
     * This method is used to set config.
     *
     * @param node_name, config node name.
     * @param value, config value.
     *
     * @return Indicate if this operation is successful.
     */
    virtual Status
    SetConfig(const std::string& node_name, const std::string& value) const = 0;
};

}  // namespace milvus