100 lines
4.7 KiB
C
100 lines
4.7 KiB
C
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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/**
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* \file
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* C interface for interaction with TDLib via JSON-serialized objects.
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* Can be used to easily integrate TDLib with any programming language which supports calling C functions
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* and is able to work with JSON.
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*
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* The JSON serialization of TDLib API objects is straightforward: all API objects are represented as JSON objects with
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* the same keys as the API object field names. The object type name is stored in the special field '@type' which is
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* optional in places where type is uniquely determined by the context.
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* Fields of Bool type are stored as Boolean, fields of int32, int53, and double types are stored as Number, fields of
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* int64 and string types are stored as String, fields of bytes type are base64 encoded and then stored as String,
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* fields of vector type are stored as Array.
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* The main TDLib interface is asynchronous. To match requests with a corresponding response a field "@extra" can
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* be added to the request object. The corresponding response will have an "@extra" field with exactly the same value.
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*
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* A TDLib client instance should be created through td_json_client_create.
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* Requests then can be sent using td_json_client_send from any thread.
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* New updates and request responses can be received through td_json_client_receive from any thread. This function
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* shouldn't be called simultaneously from two different threads. Also note that all updates and request responses
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* should be applied in the order they were received to ensure consistency.
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* Given this information, it's advisable to call this function from a dedicated thread.
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* Some service TDLib requests can be executed synchronously from any thread by using td_json_client_execute.
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* The TDLib client instance can be destroyed via td_json_client_destroy.
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*
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* General pattern of usage:
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* \code
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* void *client = td_json_client_create();
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* // somehow share the client with other threads, which will be able to send requests via td_json_client_send
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*
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* const double WAIT_TIMEOUT = 10.0; // seconds
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* int is_closed = 0; // should be set to 1, when updateAuthorizationState with authorizationStateClosed is received
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* while (!is_closed) {
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* const char *result = td_json_client_receive(client, WAIT_TIMEOUT);
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* if (result) {
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* // parse the result as JSON object and process it as an incoming update or an answer to a previously sent request
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* }
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* }
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* td_json_client_destroy(client);
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* \endcode
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*/
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#include "td/telegram/tdjson_export.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Creates a new instance of TDLib.
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* \return Pointer to the created instance of TDLib.
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*/
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TDJSON_EXPORT void *td_json_client_create();
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/**
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* Sends request to the TDLib client. May be called from any thread.
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* \param[in] client The client.
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* \param[in] request JSON-serialized null-terminated request to TDLib.
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*/
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TDJSON_EXPORT void td_json_client_send(void *client, const char *request);
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/**
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* Receives incoming updates and request responses from the TDLib client. May be called from any thread, but
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* shouldn't be called simultaneously from two different threads.
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* Returned pointer will be deallocated by TDLib during next call to td_json_client_receive or td_json_client_execute
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* in the same thread, so it can't be used after that.
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* \param[in] client The client.
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* \param[in] timeout The maximum number of seconds allowed for this function to wait for new data.
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* \return JSON-serialized null-terminated incoming update or request response. May be NULL if the timeout expires.
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*/
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TDJSON_EXPORT const char *td_json_client_receive(void *client, double timeout);
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/**
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* Synchronously executes TDLib request. May be called from any thread.
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* Only a few requests can be executed synchronously.
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* Returned pointer will be deallocated by TDLib during next call to td_json_client_receive or td_json_client_execute
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* in the same thread, so it can't be used after that.
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* \param[in] client The client. Currently ignored for all requests, so NULL can be passed.
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* \param[in] request JSON-serialized null-terminated request to TDLib.
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* \return JSON-serialized null-terminated request response. May be NULL if the request can't be parsed.
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*/
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TDJSON_EXPORT const char *td_json_client_execute(void *client, const char *request);
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/**
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* Destroys the TDLib client instance. After this is called the client instance shouldn't be used anymore.
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* \param[in] client The client.
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*/
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TDJSON_EXPORT void td_json_client_destroy(void *client);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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