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

   1 #include <arpa/inet.h>
   2 #include <assert.h>
   3 #include <microhttpd.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 #include <vector>
   9
  10 #include "httpd.h"
  11
  12 #include "defs.h"
  13 #include "flags.h"
  14 #include "metacube2.h"
  15 #include "timebase.h"
  16
  17 struct MHD_Connection;
  18 struct MHD_Response;
  19
  20 using namespace std;
  21
  22 HTTPD::HTTPD()
  23 {
  24 }
  25
  26 void HTTPD::start(int port)
  27 {
  28         MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
  29                          port,
  30                          nullptr, nullptr,
  31                          &answer_to_connection_thunk, this,
  32                          MHD_OPTION_NOTIFY_COMPLETED, &request_completed_thunk, this,
  33                          MHD_OPTION_END);
  34 }
  35
  36 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
  37 {
  38         unique_lock<mutex> lock(streams_mutex);
  39         for (Stream *stream : streams) {
  40                 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
  41         }
  42 }
  43
  44 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
  45                                       const char *url, const char *method,
  46                                       const char *version, const char *upload_data,
  47                                       size_t *upload_data_size, void **con_cls)
  48 {
  49         HTTPD *httpd = (HTTPD *)cls;
  50         return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
  51 }
  52
  53 int HTTPD::answer_to_connection(MHD_Connection *connection,
  54                                 const char *url, const char *method,
  55                                 const char *version, const char *upload_data,
  56                                 size_t *upload_data_size, void **con_cls)
  57 {
  58         // See if the URL ends in “.metacube”.
  59         HTTPD::Stream::Framing framing;
  60         printf("url=[%s]\n", url);
  61         if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
  62                 printf("metacube\n");
  63                 framing = HTTPD::Stream::FRAMING_METACUBE;
  64         } else {
  65                 printf("raw\n");
  66                 framing = HTTPD::Stream::FRAMING_RAW;
  67         }
  68
  69         HTTPD::Stream *stream = new HTTPD::Stream(framing);
  70         stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
  71         {
  72                 unique_lock<mutex> lock(streams_mutex);
  73                 streams.insert(stream);
  74         }
  75         *con_cls = stream;
  76
  77         // Does not strictly have to be equal to MUX_BUFFER_SIZE.
  78         MHD_Response *response = MHD_create_response_from_callback(
  79                 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
  80
  81         // TODO: Content-type?
  82         if (framing == HTTPD::Stream::FRAMING_METACUBE) {
  83                 MHD_add_response_header(response, "Content-encoding", "metacube");
  84         }
  85         int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
  86         //MHD_destroy_response(response);
  87
  88         return ret;
  89 }
  90
  91 void HTTPD::free_stream(void *cls)
  92 {
  93         // FIXME: When is this actually called, if ever?
  94         // Also, shouldn't we remove it from streams?
  95         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
  96         delete stream;
  97 }
  98
  99 void HTTPD::request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
 100 {
 101         HTTPD *httpd = (HTTPD *)cls;
 102         return httpd->request_completed(connection, con_cls, toe);
 103 }
 104
 105 void HTTPD::request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
 106 {
 107         if (con_cls == nullptr) {
 108                 // Request was never set up.
 109                 return;
 110         }
 111         HTTPD::Stream *stream = (HTTPD::Stream *)*con_cls;
 112         {
 113                 unique_lock<mutex> lock(streams_mutex);
 114                 delete stream;
 115                 streams.erase(stream);
 116         }
 117 }
 118
 119 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
 120 {
 121         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 122         return stream->reader_callback(pos, buf, max);
 123 }
 124
 125 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
 126 {
 127         unique_lock<mutex> lock(buffer_mutex);
 128         has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
 129
 130         ssize_t ret = 0;
 131         while (max > 0 && !buffered_data.empty()) {
 132                 const string &s = buffered_data.front();
 133                 assert(s.size() > used_of_buffered_data);
 134                 size_t len = s.size() - used_of_buffered_data;
 135                 if (max >= len) {
 136                         // Consume the entire (rest of the) string.
 137                         memcpy(buf, s.data() + used_of_buffered_data, len);
 138                         buf += len;
 139                         ret += len;
 140                         max -= len;
 141                         buffered_data.pop_front();
 142                         used_of_buffered_data = 0;
 143                 } else {
 144                         // We don't need the entire string; just use the first part of it.
 145                         memcpy(buf, s.data() + used_of_buffered_data, max);
 146                         buf += max;
 147                         used_of_buffered_data += max;
 148                         ret += max;
 149                         max = 0;
 150                 }
 151         }
 152
 153         return ret;
 154 }
 155
 156 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
 157 {
 158         if (buf_size == 0) {
 159                 return;
 160         }
 161         if (data_type == DATA_TYPE_KEYFRAME) {
 162                 seen_keyframe = true;
 163         } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
 164                 // Start sending only once we see a keyframe.
 165                 return;
 166         }
 167
 168         unique_lock<mutex> lock(buffer_mutex);
 169
 170         if (framing == FRAMING_METACUBE) {
 171                 metacube2_block_header hdr;
 172                 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
 173                 hdr.size = htonl(buf_size);
 174                 int flags = 0;
 175                 if (data_type == DATA_TYPE_HEADER) {
 176                         flags |= METACUBE_FLAGS_HEADER;
 177                 } else if (data_type == DATA_TYPE_OTHER) {
 178                         flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
 179                 }
 180                 hdr.flags = htons(flags);
 181                 hdr.csum = htons(metacube2_compute_crc(&hdr));
 182                 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
 183         }
 184         buffered_data.emplace_back(buf, buf_size);
 185         has_buffered_data.notify_all();
 186 }
 187