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154 lines
4.6 KiB
C
154 lines
4.6 KiB
C
// Copyright (c) 2015 Cesanta Software Limited
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// All rights reserved
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//
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// This example demonstrates how to handle very large requests without keeping
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// them in memory.
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "mongoose.h"
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static const char *s_http_port = "8000";
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struct file_writer_data {
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FILE *fp;
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size_t bytes_left;
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};
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static void handle_request(struct mg_connection *nc) {
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// This handler gets called only when we don't reset proto_handler in
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// handle_recv, so we just return a page unconditionally.
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mg_printf(nc, "%s",
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: text/html\r\n"
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"Connection: close\r\n"
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"\r\n"
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"<html><body>Upload example."
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"<form method=\"POST\" action=\"/upload\" "
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" enctype=\"multipart/form-data\">"
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"<input type=\"file\" name=\"file\" /> <br/>"
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"<input type=\"submit\" value=\"Upload\" />"
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"</form></body></html>");
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nc->flags |= MG_F_SEND_AND_CLOSE;
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}
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static void handle_recv(struct mg_connection *nc) {
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struct file_writer_data *data = (struct file_writer_data *) nc->user_data;
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if (data == NULL) {
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// This is a new connection, try to parse HTTP request.
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struct http_message hm;
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int req_len = mg_parse_http(nc->recv_mbuf.buf, nc->recv_mbuf.len, &hm,
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1 /* is_req */);
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if (req_len < 0 ||
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(req_len == 0 && nc->recv_mbuf.len >= MG_MAX_HTTP_REQUEST_SIZE)) {
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nc->flags |= MG_F_CLOSE_IMMEDIATELY;
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} else if (req_len == 0) {
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// Request is not complete yet, do nothing.
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} else if (mg_vcasecmp(&hm.method, "POST") == 0 &&
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mg_vcmp(&hm.uri, "/upload") == 0) {
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// This is the request that we don't want to buffer in memory.
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if (hm.body.len == (size_t) ~0 || hm.body.len == 0) {
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mg_printf(nc, "%s",
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"HTTP/1.1 411 Content-Length required\r\n"
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"Content-Length: 0\r\n\r\n");
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nc->flags |= MG_F_SEND_AND_CLOSE;
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return;
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}
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// Reset proto_handler so Mongoose's http_handler() won't get confused
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// once we start removing data from the buffer.
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nc->proto_handler = NULL;
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// Headers will be inaccessible later, so put everything we need into
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// user_data.
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data = calloc(1, sizeof(struct file_writer_data));
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data->bytes_left = hm.body.len;
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data->fp = tmpfile();
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if (data->fp == NULL) {
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mg_printf(nc, "%s",
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"HTTP/1.1 500 Failed to open a file\r\n"
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"Content-Length: 0\r\n\r\n");
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nc->flags |= MG_F_SEND_AND_CLOSE;
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return;
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}
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nc->user_data = (void *) data;
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// Remove the headers from the buffer.
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mbuf_remove(&nc->recv_mbuf, hm.body.p - nc->recv_mbuf.buf);
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// Invoke itself again to write the piece of the body that is already in
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// the buffer.
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handle_recv(nc);
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}
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} else { // data != NULL
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size_t to_write = data->bytes_left, written = 0;
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if (nc->recv_mbuf.len < to_write) to_write = nc->recv_mbuf.len;
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written = fwrite(nc->recv_mbuf.buf, 1, to_write, data->fp);
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mbuf_remove(&nc->recv_mbuf, written);
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data->bytes_left -= written;
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if (data->bytes_left <= 0) {
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// Request is complete, do something meaningful here.
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mg_printf(nc,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: text/plain\r\n"
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"Connection: close\r\n\r\n"
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"Written %ld of POST data to a temp file\n\n",
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(long) ftell(data->fp));
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nc->flags |= MG_F_SEND_AND_CLOSE;
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// handle_close will free the resources.
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}
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}
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}
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// Make sure we free all allocated resources
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static void handle_close(struct mg_connection *nc) {
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struct file_writer_data *data = (struct file_writer_data *) nc->user_data;
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if (data != NULL) {
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fclose(data->fp);
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free(data);
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nc->user_data = NULL;
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}
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}
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static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
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(void) ev_data;
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switch (ev) {
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case MG_EV_HTTP_REQUEST:
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// Invoked when the full HTTP request is in the buffer (including body).
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handle_request(nc);
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break;
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case MG_EV_RECV:
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// Invoked every time new data arrives.
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handle_recv(nc);
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break;
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case MG_EV_CLOSE:
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handle_close(nc);
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break;
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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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struct mg_connection *nc;
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mg_mgr_init(&mgr, NULL);
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nc = mg_bind(&mgr, s_http_port, ev_handler);
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// Set up HTTP server parameters
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mg_set_protocol_http_websocket(nc);
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printf("Starting web server on port %s\n", s_http_port);
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for (;;) {
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mg_mgr_poll(&mgr, 1000);
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}
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mg_mgr_free(&mgr);
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return 0;
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}
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