move to new skeleton

tutorials/http/http-streaming-client/main.c

@@ -0,0 +1,70 @@
+// Copyright (c) 2021 Cesanta Software Limited
+// All rights reserved
+//
+// Example streaming HTTP client.
+// The default HTTP handler waits until the whole HTTP message is buffered in
+// c->recv IO buffer. It can be large. This example shows how to receive
+// a potentially large response in chunks by handling the MG_EV_READ events.
+//
+// You can change `s_url` from the command line by executing: ./example YOUR_URL
+// To enable SSL/TLS, see https://mongoose.ws/tutorials/tls/#how-to-build
+
+#include "mongoose.h"
+
+// The very first web page in history. You can replace it from command line
+static const char *s_url = "http://info.cern.ch";
+
+// Print HTTP response and signal that we're done
+static void fn(struct mg_connection *c, int ev, void *ev_data) {
+  if (ev == MG_EV_CONNECT) {
+    // Connected to server. Extract host name from URL
+    struct mg_str host = mg_url_host(s_url);
+    if (mg_url_is_ssl(s_url)) {
+      struct mg_tls_opts opts = {.ca = mg_unpacked("/certs/ca.pem"),
+                                 .name = host};
+      mg_tls_init(c, &opts);
+    }
+    // Send request
+    mg_printf(c,
+              "GET %s HTTP/1.1\r\n"
+              "Connection: close\r\n"
+              "Host: %.*s\r\n"
+              "\r\n",
+              mg_url_uri(s_url), (int) host.len, host.buf);
+  } else if (ev == MG_EV_READ) {
+    // c->data[0] holds a flag, whether we have parsed the request already
+    if (c->data[0] == 0) {
+      struct mg_http_message hm;
+      int n = mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+      if (n < 0) mg_error(c, "Bad response");
+      if (n > 0) {
+        fwrite(c->recv.buf + n, 1, c->recv.len - n, stdout);  // Print body
+        c->recv.len = 0;  // Cleanup receive buffer
+        c->data[0] = 1;   // Request parsed, set the flag
+      }
+    } else {
+      fwrite(c->recv.buf, 1, c->recv.len, stdout);
+      c->recv.len = 0;  // Cleanup the receive buffer
+    }
+  } else if (ev == MG_EV_CLOSE) {
+    *(bool *) c->fn_data = true;  // Done, tell event loop to stop
+  } else if (ev == MG_EV_ERROR) {
+    *(bool *) c->fn_data = true;  // Error, Tell event loop to stop
+  }
+  (void) ev_data;
+}
+
+int main(int argc, char *argv[]) {
+  struct mg_mgr mgr;  // Event manager
+  bool done = false;  // Event handler flips it to true
+
+  mg_mgr_init(&mgr);       // Initialise event manager
+  mg_log_set(MG_LL_INFO);  // Set to 0 to disable debug log
+
+  if (argc > 1) s_url = argv[1];          // Use URL from command line
+  mg_connect(&mgr, s_url, fn, &done);     // Create client connection
+  while (!done) mg_mgr_poll(&mgr, 1000);  // Infinite event loop
+  mg_mgr_free(&mgr);                      // Free resources
+
+  return 0;
+}