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