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