move file-transfer -> tutorials

tutorials/http/file-transfer/client.c

@@ -0,0 +1,117 @@
+// Copyright (c) 2021 Cesanta Software Limited
+// All rights reserved
+//
+// Example HTTP client. Connect to `s_url`, send request, wait for a response,
+// print the response and exit.
+// 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"
+
+static int s_debug_level = MG_LL_INFO;
+static const char *s_user = "user";
+static const char *s_pass = "pass";
+static const char *s_fname = NULL;
+static struct mg_fd *fd;  // file descriptor
+static size_t fsize;
+static const char *s_url = "http://localhost:8090/upload/foo.txt";
+static const uint64_t s_timeout_ms = 1500;  // Connect timeout in milliseconds
+
+// 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_OPEN) {
+    // Connection created. Store connect expiration time in c->data
+    *(uint64_t *) c->data = mg_millis() + s_timeout_ms;
+  } else if (ev == MG_EV_POLL) {
+    if (mg_millis() > *(uint64_t *) c->data &&
+        (c->is_connecting || c->is_resolving)) {
+      mg_error(c, "Connect timeout");
+    }
+  } else if (ev == MG_EV_CONNECT) {
+    // Connected to server. Extract host name from URL
+    struct mg_str host = mg_url_host(s_url);
+    // Send request
+    MG_DEBUG(("Connected, send request"));
+    mg_printf(c,
+              "POST %s HTTP/1.0\r\n"
+              "Host: %.*s\r\n"
+              "Content-Type: octet-stream\r\n"
+              "Content-Length: %d\r\n",
+              mg_url_uri(s_url), (int) host.len, host.buf, fsize);
+    mg_http_bauth(c, s_user, s_pass);  // Add Basic auth header
+    mg_printf(c, "%s", "\r\n");        // End HTTP headers
+  } else if (ev == MG_EV_WRITE && c->send.len < MG_IO_SIZE) {
+    uint8_t *buf = alloca(MG_IO_SIZE);
+    size_t len = MG_IO_SIZE - c->send.len;
+    len = fsize < len ? fsize : len;
+    fd->fs->rd(fd->fd, buf, len);
+    mg_send(c, buf, len);
+    fsize -= len;
+    MG_DEBUG(("sent %u bytes", len));
+  } else if (ev == MG_EV_HTTP_MSG) {
+    MG_DEBUG(("MSG"));
+    // Response is received. Print it
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    printf("%.*s", (int) hm->body.len, hm->body.buf);
+    c->is_draining = 1;  // Tell mongoose to close this connection
+    mg_fs_close(fd);
+    *(bool *) c->fn_data = true;  // Tell event loop to stop
+  } else if (ev == MG_EV_ERROR) {
+    MG_DEBUG(("ERROR"));
+    mg_fs_close(fd);
+    *(bool *) c->fn_data = true;  // Error, tell event loop to stop
+  }
+}
+
+static void usage(const char *prog) {
+  fprintf(stderr,
+          "File Transfer client based on Mongoose v.%s\n"
+          "Usage: %s -f NAME OPTIONS\n"
+          "  -u NAME   - user name, default: '%s'\n"
+          "  -p PWD    - password, default: '%s'\n"
+          "  -U URL    - Full server URL, including destination file name; "
+          "default: '%s'\n"
+          "  -f NAME   - File to send\n"
+          "  -v LEVEL  - debug level, from 0 to 4, default: %d\n",
+          MG_VERSION, prog, s_user, s_pass, s_url, s_debug_level);
+  exit(EXIT_FAILURE);
+}
+
+int main(int argc, char *argv[]) {
+  struct mg_mgr mgr;  // Event manager
+  bool done = false;  // Event handler flips it to true
+  time_t mtime;
+  int i;
+
+  // Parse command-line flags
+  for (i = 1; i < argc; i++) {
+    if (strcmp(argv[i], "-f") == 0) {
+      s_fname = argv[++i];
+    } else if (strcmp(argv[i], "-u") == 0) {
+      s_user = argv[++i];
+    } else if (strcmp(argv[i], "-p") == 0) {
+      s_pass = argv[++i];
+    } else if (strcmp(argv[i], "-U") == 0) {
+      s_url = argv[++i];
+    } else if (strcmp(argv[i], "-v") == 0) {
+      s_debug_level = atoi(argv[++i]);
+    } else {
+      usage(argv[0]);
+    }
+  }
+  if (s_fname == NULL) usage(argv[0]);
+  mg_fs_posix.st(s_fname, &fsize, &mtime);
+  if (fsize == 0 ||
+      (fd = mg_fs_open(&mg_fs_posix, s_fname, MG_FS_READ)) == NULL) {
+    MG_ERROR(("open failed: %d", errno));
+    exit(EXIT_FAILURE);
+  }
+
+  mg_log_set(s_debug_level);
+  mg_mgr_init(&mgr);                        // Initialise event manager
+  mg_http_connect(&mgr, s_url, fn, &done);  // Create client connection
+  while (!done) mg_mgr_poll(&mgr, 50);      // Event manager loops until 'done'
+  mg_mgr_free(&mgr);                        // Free resources
+  return 0;
+}