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 HTTPD::~HTTPD()
  27 {
  28         MHD_quiesce_daemon(mhd);
  29         for (Stream *stream : streams) {
  30                 stream->stop();
  31         }
  32         MHD_stop_daemon(mhd);
  33 }
  34
  35 void HTTPD::start(int port)
  36 {
  37         mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
  38                                port,
  39                                nullptr, nullptr,
  40                                &answer_to_connection_thunk, this,
  41                                MHD_OPTION_NOTIFY_COMPLETED, &request_completed_thunk, this,
  42                                MHD_OPTION_END);
  43 }
  44
  45 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
  46 {
  47         unique_lock<mutex> lock(streams_mutex);
  48         for (Stream *stream : streams) {
  49                 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
  50         }
  51 }
  52
  53 int HTTPD::answer_to_connection_thunk(void *cls, 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         HTTPD *httpd = (HTTPD *)cls;
  59         return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
  60 }
  61
  62 int HTTPD::answer_to_connection(MHD_Connection *connection,
  63                                 const char *url, const char *method,
  64                                 const char *version, const char *upload_data,
  65                                 size_t *upload_data_size, void **con_cls)
  66 {
  67         // See if the URL ends in “.metacube”.
  68         HTTPD::Stream::Framing framing;
  69         if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
  70                 framing = HTTPD::Stream::FRAMING_METACUBE;
  71         } else {
  72                 framing = HTTPD::Stream::FRAMING_RAW;
  73         }
  74
  75         HTTPD::Stream *stream = new HTTPD::Stream(framing);
  76         stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
  77         {
  78                 unique_lock<mutex> lock(streams_mutex);
  79                 streams.insert(stream);
  80         }
  81         *con_cls = stream;
  82
  83         // Does not strictly have to be equal to MUX_BUFFER_SIZE.
  84         MHD_Response *response = MHD_create_response_from_callback(
  85                 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
  86
  87         // TODO: Content-type?
  88         if (framing == HTTPD::Stream::FRAMING_METACUBE) {
  89                 MHD_add_response_header(response, "Content-encoding", "metacube");
  90         }
  91         int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
  92         //MHD_destroy_response(response);
  93
  94         return ret;
  95 }
  96
  97 void HTTPD::free_stream(void *cls)
  98 {
  99         // FIXME: When is this actually called, if ever?
 100         // Also, shouldn't we remove it from streams?
 101         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 102         delete stream;
 103 }
 104
 105 void HTTPD::request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
 106 {
 107         HTTPD *httpd = (HTTPD *)cls;
 108         return httpd->request_completed(connection, con_cls, toe);
 109 }
 110
 111 void HTTPD::request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
 112 {
 113         if (con_cls == nullptr) {
 114                 // Request was never set up.
 115                 return;
 116         }
 117         HTTPD::Stream *stream = (HTTPD::Stream *)*con_cls;
 118         {
 119                 unique_lock<mutex> lock(streams_mutex);
 120                 delete stream;
 121                 streams.erase(stream);
 122         }
 123 }
 124
 125 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
 126 {
 127         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 128         return stream->reader_callback(pos, buf, max);
 129 }
 130
 131 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
 132 {
 133         unique_lock<mutex> lock(buffer_mutex);
 134         has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
 135         if (should_quit) {
 136                 return 0;
 137         }
 138
 139         ssize_t ret = 0;
 140         while (max > 0 && !buffered_data.empty()) {
 141                 const string &s = buffered_data.front();
 142                 assert(s.size() > used_of_buffered_data);
 143                 size_t len = s.size() - used_of_buffered_data;
 144                 if (max >= len) {
 145                         // Consume the entire (rest of the) string.
 146                         memcpy(buf, s.data() + used_of_buffered_data, len);
 147                         buf += len;
 148                         ret += len;
 149                         max -= len;
 150                         buffered_data.pop_front();
 151                         used_of_buffered_data = 0;
 152                 } else {
 153                         // We don't need the entire string; just use the first part of it.
 154                         memcpy(buf, s.data() + used_of_buffered_data, max);
 155                         buf += max;
 156                         used_of_buffered_data += max;
 157                         ret += max;
 158                         max = 0;
 159                 }
 160         }
 161
 162         return ret;
 163 }
 164
 165 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
 166 {
 167         if (buf_size == 0) {
 168                 return;
 169         }
 170         if (data_type == DATA_TYPE_KEYFRAME) {
 171                 seen_keyframe = true;
 172         } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
 173                 // Start sending only once we see a keyframe.
 174                 return;
 175         }
 176
 177         unique_lock<mutex> lock(buffer_mutex);
 178
 179         if (framing == FRAMING_METACUBE) {
 180                 metacube2_block_header hdr;
 181                 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
 182                 hdr.size = htonl(buf_size);
 183                 int flags = 0;
 184                 if (data_type == DATA_TYPE_HEADER) {
 185                         flags |= METACUBE_FLAGS_HEADER;
 186                 } else if (data_type == DATA_TYPE_OTHER) {
 187                         flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
 188                 }
 189                 hdr.flags = htons(flags);
 190                 hdr.csum = htons(metacube2_compute_crc(&hdr));
 191                 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
 192         }
 193         buffered_data.emplace_back(buf, buf_size);
 194         has_buffered_data.notify_all();
 195 }
 196
 197 void HTTPD::Stream::stop()
 198 {
 199         unique_lock<mutex> lock(buffer_mutex);
 200         should_quit = true;
 201         has_buffered_data.notify_all();
 202 }