git.sesse.net Git - nageru/blob - httpd.cpp

   1 #include <assert.h>
   2 #include <microhttpd.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6
   7 #include <vector>
   8
   9 #include "httpd.h"
  10
  11 #include "defs.h"
  12 #include "flags.h"
  13 #include "timebase.h"
  14
  15 struct MHD_Connection;
  16 struct MHD_Response;
  17
  18 using namespace std;
  19
  20 HTTPD::HTTPD()
  21 {
  22 }
  23
  24 void HTTPD::start(int port)
  25 {
  26         MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
  27                          port,
  28                          nullptr, nullptr,
  29                          &answer_to_connection_thunk, this,
  30                          MHD_OPTION_NOTIFY_COMPLETED, &request_completed_thunk, this,
  31                          MHD_OPTION_END);
  32 }
  33
  34 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
  35 {
  36         unique_lock<mutex> lock(streams_mutex);
  37         for (Stream *stream : streams) {
  38                 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
  39         }
  40 }
  41
  42 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
  43                                       const char *url, const char *method,
  44                                       const char *version, const char *upload_data,
  45                                       size_t *upload_data_size, void **con_cls)
  46 {
  47         HTTPD *httpd = (HTTPD *)cls;
  48         return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
  49 }
  50
  51 int HTTPD::answer_to_connection(MHD_Connection *connection,
  52                                 const char *url, const char *method,
  53                                 const char *version, const char *upload_data,
  54                                 size_t *upload_data_size, void **con_cls)
  55 {
  56         HTTPD::Stream *stream = new HTTPD::Stream;
  57         stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
  58         {
  59                 unique_lock<mutex> lock(streams_mutex);
  60                 streams.insert(stream);
  61         }
  62         *con_cls = stream;
  63
  64         // Does not strictly have to be equal to MUX_BUFFER_SIZE.
  65         MHD_Response *response = MHD_create_response_from_callback(
  66                 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
  67         int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
  68         //MHD_destroy_response(response);
  69
  70         return ret;
  71 }
  72
  73 void HTTPD::free_stream(void *cls)
  74 {
  75         // FIXME: When is this actually called, if ever?
  76         // Also, shouldn't we remove it from streams?
  77         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
  78         delete stream;
  79 }
  80
  81 void HTTPD::request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
  82 {
  83         HTTPD *httpd = (HTTPD *)cls;
  84         return httpd->request_completed(connection, con_cls, toe);
  85 }
  86
  87 void HTTPD::request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
  88 {
  89         if (con_cls == nullptr) {
  90                 // Request was never set up.
  91                 return;
  92         }
  93         HTTPD::Stream *stream = (HTTPD::Stream *)*con_cls;
  94         {
  95                 unique_lock<mutex> lock(streams_mutex);
  96                 delete stream;
  97                 streams.erase(stream);
  98         }
  99 }
 100
 101 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
 102 {
 103         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 104         return stream->reader_callback(pos, buf, max);
 105 }
 106
 107 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
 108 {
 109         unique_lock<mutex> lock(buffer_mutex);
 110         has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
 111
 112         ssize_t ret = 0;
 113         while (max > 0 && !buffered_data.empty()) {
 114                 const string &s = buffered_data.front();
 115                 assert(s.size() > used_of_buffered_data);
 116                 size_t len = s.size() - used_of_buffered_data;
 117                 if (max >= len) {
 118                         // Consume the entire (rest of the) string.
 119                         memcpy(buf, s.data() + used_of_buffered_data, len);
 120                         buf += len;
 121                         ret += len;
 122                         max -= len;
 123                         buffered_data.pop_front();
 124                         used_of_buffered_data = 0;
 125                 } else {
 126                         // We don't need the entire string; just use the first part of it.
 127                         memcpy(buf, s.data() + used_of_buffered_data, max);
 128                         buf += max;
 129                         used_of_buffered_data += max;
 130                         ret += max;
 131                         max = 0;
 132                 }
 133         }
 134
 135         return ret;
 136 }
 137
 138 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
 139 {
 140         if (buf_size == 0) {
 141                 return;
 142         }
 143         if (data_type == DATA_TYPE_KEYFRAME) {
 144                 seen_keyframe = true;
 145         } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
 146                 // Start sending only once we see a keyframe.
 147                 return;
 148         }
 149
 150         unique_lock<mutex> lock(buffer_mutex);
 151         buffered_data.emplace_back(buf, buf_size);
 152         has_buffered_data.notify_all();
 153 }
 154