mirror of
https://github.com/cesanta/mongoose.git
synced 2024-12-04 09:49:01 +08:00
81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
// Copyright (c) 2020-2024 Cesanta Software Limited
|
|
// All rights reserved
|
|
//
|
|
// Streaming upload example. Demonstrates how to use MG_EV_READ events
|
|
// to save a large file without buffering it fully in memory.
|
|
//
|
|
// curl http://localhost:8000/upload?name=a.txt --data-binary @large_file.txt
|
|
|
|
#include "mongoose.h"
|
|
|
|
#define UPLOAD_DIR "/tmp"
|
|
|
|
struct upload_state {
|
|
size_t expected; // POST data length, bytes
|
|
size_t received; // Already received bytes
|
|
void *fp; // Opened uploaded file
|
|
};
|
|
|
|
static void handle_uploads(struct mg_connection *c, int ev, void *ev_data) {
|
|
struct upload_state *us = (struct upload_state *) c->data;
|
|
struct mg_fs *fs = &mg_fs_posix;
|
|
|
|
// Catch /upload requests early, without buffering whole body
|
|
// When we receive MG_EV_HTTP_HDRS event, that means we've received all
|
|
// HTTP headers but not necessarily full HTTP body
|
|
if (ev == MG_EV_HTTP_HDRS) {
|
|
struct mg_http_message *hm = (struct mg_http_message *) ev_data;
|
|
if (mg_match(hm->uri, mg_str("/upload/*"), NULL)) {
|
|
char path[MG_PATH_MAX];
|
|
mg_snprintf(path, sizeof(path), "%s/%.*s", UPLOAD_DIR, hm->uri.len - 8,
|
|
hm->uri.ptr + 8);
|
|
us->expected = hm->body.len; // Store number of bytes we expect
|
|
mg_iobuf_del(&c->recv, 0, hm->head.len); // Delete HTTP headers
|
|
c->pfn = NULL; // Silence HTTP protocol handler, we'll use MG_EV_READ
|
|
if (mg_path_is_sane(path)) {
|
|
fs->rm(path); // Delete file if it exists
|
|
us->fp = fs->op(path, MG_FS_WRITE); // Open file for writing
|
|
}
|
|
}
|
|
}
|
|
|
|
// Catch uploaded file data for both MG_EV_READ and MG_EV_HTTP_HDRS
|
|
if (us->expected > 0 && c->recv.len > 0) {
|
|
us->received += c->recv.len;
|
|
if (us->fp) fs->wr(us->fp, c->recv.buf, c->recv.len); // Write to file
|
|
c->recv.len = 0; // Delete received data
|
|
if (us->received >= us->expected) {
|
|
// Uploaded everything. Send response back
|
|
MG_INFO(("Uploaded %lu bytes", us->received));
|
|
mg_http_reply(c, 200, NULL, "%lu ok\n", us->received);
|
|
if (us->fp) fs->cl(us->fp); // Close file
|
|
memset(us, 0, sizeof(*us)); // Cleanup upload state
|
|
c->is_draining = 1; // Close connection when response gets sent
|
|
}
|
|
}
|
|
}
|
|
|
|
static void fn(struct mg_connection *c, int ev, void *ev_data) {
|
|
handle_uploads(c, ev, ev_data);
|
|
|
|
// Non-upload requests, we serve normally
|
|
// NOTE: handle_uploads() may delete request and reset c->pfn
|
|
if (ev == MG_EV_HTTP_MSG && c->pfn != NULL) {
|
|
struct mg_http_serve_opts opts = {.root_dir = "web_root"};
|
|
mg_http_serve_dir(c, ev_data, &opts);
|
|
}
|
|
}
|
|
|
|
int main(void) {
|
|
struct mg_mgr mgr;
|
|
|
|
mg_mgr_init(&mgr);
|
|
mg_log_set(MG_LL_DEBUG); // Set debug log level
|
|
mg_http_listen(&mgr, "http://localhost:8000", fn, NULL);
|
|
|
|
for (;;) mg_mgr_poll(&mgr, 50);
|
|
mg_mgr_free(&mgr);
|
|
|
|
return 0;
|
|
}
|