C客户端使用libwebsocket调用ibm-watson api

Question

我正在使用libwebsocket库创建一个c客户端，它调用ibm- watson speech to text服务器。因此，我使用了minimal-ws-client-rx示例网关，然后当我尝试运行它给出的代码时，我将i.address更改为“https://github.com/warmcat/libwebsockets/blob/master/minimal-examples/ws-client/minimal-ws-client-rx/minimal-ws-client.c -lon.watsonplatform.net”，并将i.path更改为"/speech-to-text/api/v1/recognize?apikey:Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx“：

注意:创建了默认客户端ssl上下文警告: lws_client_handshake: got HTTP response '401‘ERR: CLIENT_CONNECTION_ERROR: HS: ws升级未经授权但当我将i.port更改为80时，错误为：

注意:为默认错误创建客户端ssl上下文: CLIENT_CONNECTION_ERROR:超时等待SSL用户:已完成失败

整个代码是：

/* * lws-minimal-ws-client **版权所有(C) 2018安迪·格林**此文件在知识共享CC0 1.0 *通用公有领域贡献项下提供。**这演示了使用lws的最小ws客户端。**它连接到https://libwebsockets.org/，并与那里的哑巴增量协议建立* wss连接。当* connected时，它打印*哑增量协议发送的数字。*/

#include <libwebsockets.h>
#include <string.h>
#include <signal.h>

static int interrupted, rx_seen, test; static struct lws *client_wsi;

static int callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
          void *user, void *in, size_t len) {   switch (reason) {

    /* because we are protocols[0] ... */   case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:      lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
             in ? (char *)in : "(null)");       client_wsi = NULL;      break;

    case LWS_CALLBACK_CLIENT_ESTABLISHED:       lwsl_user("%s: established\n", __func__);       break;

    case LWS_CALLBACK_CLIENT_RECEIVE:       lwsl_user("RX: %s\n", (const char
*)in);      rx_seen++;      if (test && rx_seen == 10)          interrupted = 1;        break;

    case LWS_CALLBACK_CLIENT_CLOSED:        client_wsi = NULL;      break;

    default:        break;  }

    return lws_callback_http_dummy(wsi, reason, user, in, len); }

static const struct lws_protocols protocols[] = {   {       "dumb-increment-protocol",      callback_dumb_increment,        0,      0,  },  { NULL, NULL, 0, 0 } };

static void sigint_handler(int sig) {   interrupted = 1; }

int main(int argc, const char **argv) {     struct lws_context_creation_info info;  struct lws_client_connect_info i;   struct lws_context *context;    const char *p;  int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE        /* for LLL_ verbosity above NOTICE to be built into lws, lws         * must have been configured with -DCMAKE_BUILD_TYPE=DEBUG       * instead of =RELEASE */       /* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */      /* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */      /* | LLL_DEBUG */;

    signal(SIGINT, sigint_handler);     if ((p = lws_cmdline_option(argc, argv, "-d")))         logs = atoi(p);

    test = !!lws_cmdline_option(argc, argv, "-t");

    lws_set_log_level(logs, NULL);  lwsl_user("LWS minimal ws client rx [-d <logs>] [--h2] [-t (test)]\n");

    memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */    info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;    info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */  info.protocols
= protocols;
#if defined(LWS_WITH_MBEDTLS)   /*   * OpenSSL uses the system trust store.  mbedTLS has to be told which    * CA to trust explicitly.   */         //info.client_ssl_ca_filepath = "./libwebsockets.org.cer";

        info.client_ssl_ca_filepath = "/home/wafa/stt/*watsonplatformnet.crt";
#endif

    context = lws_create_context(&info);    if (!context) {         lwsl_err("lws init failed\n");      return 1;   }

    memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */  i.context = context;    i.port = 443;   i.address = "gateway-lon.watsonplatform.net";   i.path = "/speech-to-text/api/v1/recognize?apikey:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";  //i.address = "libwebsockets.org";  i.host = i.address;     i.origin = i.address;   i.ssl_connection = LCCSCF_USE_SSL;  i.protocol = protocols[0].name; /* "dumb-increment-protocol" */     i.pwsi = &client_wsi;

    if (lws_cmdline_option(argc, argv, "--h2"))         i.alpn = "h2";

    lws_client_connect_via_info(&i);

    while (n >= 0 && client_wsi && !interrupted)        n = lws_service(context, 1000);

    lws_context_destroy(context);

    lwsl_user("Completed %s\n", rx_seen > 10 ? "OK" : "Failed");

    return rx_seen > 10; }

Answer 1

您确实需要显示用于连接到Speech to Text服务的代码，而不是您将其作为基础的代码，因为这将是您编码错误的代码。如果没有它，我只能猜测你可能做错了什么。

第一:你应该连接到看起来像web socket地址的东西，而不是http地址。例如：

wss://stream.watsonplatform.net/speech-to-text/api/v1/recognize

但是具有伦敦端点地址。