7.0 refactor

examples/live-log/main.c

@@ -0,0 +1,61 @@
+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+
+// HTTP request handler function. It implements the following endpoints:
+//   /api/log/static - returns contents of log.txt file
+//   /api/log/live - hangs forever, and returns live log messages
+//   all other URI - serves web_root/ directory
+static void cb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    if (mg_http_match_uri(hm, "/api/log/static")) {
+      mg_http_serve_file(c, hm, "log.txt", "text/plain");
+    } else if (mg_http_match_uri(hm, "/api/log/live")) {
+      c->label[0] = 'L';  // Mark that connection as live log listener
+      mg_printf(c, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
+    } else {
+      mg_http_serve_dir(c, ev_data, "web_root");
+    }
+  }
+}
+
+static void log_message(const char *filename, const char *message) {
+  FILE *fp = fopen(filename, "a");
+  if (fp != NULL) {
+    fprintf(fp, "%s", message);
+    fclose(fp);
+  }
+}
+
+static void broadcast_message(struct mg_mgr *mgr, const char *message) {
+  struct mg_connection *c;
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    if (c->label[0] == 'L') mg_http_printf_chunk(c, "%s", message);
+  }
+}
+
+// Timer function - called periodically.
+// Prepare log message. Save it to a file, and broadcast.
+static void timer_fn(void *arg) {
+  char buf[64];
+  snprintf(buf, sizeof(buf), "Time is: %lu\n", (unsigned long) time(NULL));
+  log_message("log.txt", buf);
+  broadcast_message(arg, buf);
+}
+
+int main(void) {
+  struct mg_mgr mgr;
+  struct mg_timer t1;
+
+  mg_mgr_init(&mgr);
+  mg_http_listen(&mgr, "http://localhost:8000", cb, NULL);
+  mg_timer_init(&t1, 1000, MG_TIMER_REPEAT, timer_fn, &mgr);
+
+  for (;;) mg_mgr_poll(&mgr, 50);
+  mg_timer_free(&t1);
+  mg_mgr_free(&mgr);
+
+  return 0;
+}