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/*
This file is part of GNU Taler
Copyright (C) 2014-2022 Taler Systems SA
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler 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. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* C interface to the functionality of wallet-core.
*
* Currently, the underlying implementation uses the JS implementation of
* wallet-core, but this may (or may not) change in the future.
*
* @author Florian Dold
*/
#ifndef _TALER_WALLET_LIB_H
#define _TALER_WALLET_LIB_H
#include "quickjs/quickjs-http.h"
/**
* Opaque handle to a Taler wallet-core instance.
*/
struct TALER_WALLET_Instance;
/**
* Handler for messages from the wallet.
*
* @param handler_p opaque closure for the message handler
* @param message message from wallet-core as a JSON string
*/
typedef void (*TALER_WALLET_MessageHandlerFn)(void *handler_p, const char *message);
enum TALER_WALLET_LogLevel {
TALER_WALLET_LOG_TRACE = 1,
TALER_WALLET_LOG_INFO = 2,
TALER_WALLET_LOG_MESSAGE = 3,
TALER_WALLET_LOG_WARN = 4,
TALER_WALLET_LOG_ERROR = 5
};
/**
* Handler for log message from wallet-core.
*
* @param log_p opaque closure for the log handler
* @param level log level of the log message
* @param tag log tag (usually the file from which the message gets logged)
* @param msg the log message
*/
typedef void (*TALER_WALLET_LogHandlerFn)(void *log_p,
enum TALER_WALLET_LogLevel level,
const char *tag,
const char *msg);
/**
* Create a new wallet-core instance..
*/
struct TALER_WALLET_Instance *
TALER_WALLET_create(void);
/**
* Set a handler for notification and response messages.
* Must be called before the wallet runs.
*
* Caution: The handler will be called from a different thread.
*/
void
TALER_WALLET_set_message_handler(struct TALER_WALLET_Instance *twi,
TALER_WALLET_MessageHandlerFn handler_f,
void *handler_p);
/**
* Set a handler for log messages from wallet-core.
* Must be called before the wallet runs.
*
* Caution: The log message handler will be called from a different thread.
*/
void
TALER_WALLET_set_log_handler(struct TALER_WALLET_Instance *twi,
TALER_WALLET_LogHandlerFn handler_f,
void *handler_p);
/**
* Set/override the JS file with the wallet-core implementation.
* Must be called before the wallet runs.
*/
// FIXME: Not implemented!
//void
//TALER_WALLET_set_jsfile(struct TALER_WALLET_Instance *twi,
// const char *filename);
/**
* Send a message to wallet-core.
*
* Responses will be sent asynchronously to the message handler
* set with #TALER_WALLET_set_message_handler.
*/
int
TALER_WALLET_send_request(struct TALER_WALLET_Instance *twi,
const char *request);
/**
* Run wallet-core in a thread.
*
* This function creates a new thread and returns immediately.
*
* Returns 0 on success or a non-zero error code otherwise.
*/
int
TALER_WALLET_run(struct TALER_WALLET_Instance *twi);
/**
* Block until the wallet returns.
*/
void
TALER_WALLET_join(struct TALER_WALLET_Instance *twi);
/**
* Destroy the wallet handle and free resources associated with it.
*
* Note that for a graceful shutdown of the wallet,
* an appropriate shutdown message should be sent first,
* and destroy() should only be called after the wallet has
* sent a response to the shutdown message.
*/
//void
//TALER_WALLET_destroy(struct TALER_WALLET_Instance *twi);
/**
* Handler for messages that should be logged.
*
* @param stream NOT YET IMPLEMENTED: indicator for the stream that
* the message is coming from,
*/
typedef void (*TALER_LogFn)(void *handler_p, int stream, const char *msg);
/**
* Redirect stderr and stdout to a function.
*
* Workaround for platforms where stderr is not visible in logs.
*
* @return 0 on success, error code otherwise
*/
int
TALER_start_redirect_std(TALER_LogFn logfn, void *handler_p);
/**
* Set the HTTP client implementation to be used by the wallet.
*
* @param twi wallet-core instance
* @param impl HTTP client implementation
*/
void
TALER_set_http_client_implementation(struct TALER_WALLET_Instance *twi,
struct JSHttpClientImplementation *impl);
/**
* Set the reference CuRL-based HTTP client implementation as the one
* to be used by the wallet.
*
* @param twi wallet-core instance
*/
void
TALER_set_curl_http_client(struct TALER_WALLET_Instance *twi);
#pragma mark -
/**
* Build JSHttpClientImplementation struct for native HTTP client implementation to be used by the wallet.
*
* @param req_create HTTP client implementation
* @param req_cancel HTTP client implementation
* @param handler_p Pointer to Handler's "this"
*/
struct JSHttpClientImplementation *
TALER_pack_http_client_implementation(JSHttpReqCreateFn req_create,
JSHttpReqCancelFn req_cancel,
void *handler_p);
#endif /*_TALER_WALLET_LIB_H */
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