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65 lines
2.2 KiB
C
65 lines
2.2 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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static void handle_uploads(struct mg_connection *c, int ev, void *ev_data) {
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size_t *data = (size_t *) c->data;
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// Catch /upload requests early, without buffering whole 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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// 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. We save HTTP body
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// length in data[0]:
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// data[0] contains expected number of bytes
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// data[1] contains received number of bytes
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data[0] = 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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}
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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 (data[0] > 0 && c->recv.len > 0) {
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data[1] += c->recv.len;
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// MG_DEBUG(("Got chunk len %lu, %lu total", c->recv.len, data[1]));
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c->recv.len = 0; // Delete received data
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if (data[1] >= data[0]) {
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// Uploaded everything. Send response back
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MG_INFO(("Uploaded %lu bytes", data[1]));
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mg_http_reply(c, 200, NULL, "%lu ok\n", data[1]);
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c->is_draining = 1; // Close us 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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if (ev == MG_EV_HTTP_MSG) {
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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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