Exemplo n.º 1
0
ngx_int_t nchan_pubsub_handler(ngx_http_request_t *r) {
  nchan_loc_conf_t       *cf = ngx_http_get_module_loc_conf(r, ngx_nchan_module);
  ngx_str_t              *channel_id;
  subscriber_t           *sub;
  nchan_msg_id_t         *msg_id;
  ngx_int_t               rc = NGX_DONE;
  nchan_request_ctx_t    *ctx;
  nchan_group_limits_t    group_limits;
  
#if NCHAN_BENCHMARK
  struct timeval          tv;
  ngx_gettimeofday(&tv);
#endif
  
  if(r->connection && (r->connection->read->eof || r->connection->read->pending_eof)) {
    ngx_http_finalize_request(r, NGX_HTTP_CLIENT_CLOSED_REQUEST);
    return NGX_ERROR;
  }  
  
  if((ctx = ngx_pcalloc(r->pool, sizeof(nchan_request_ctx_t))) == NULL) {
    return NGX_HTTP_INTERNAL_SERVER_ERROR;
  }
  ngx_http_set_ctx(r, ctx, ngx_nchan_module);

#if NCHAN_BENCHMARK
  ctx->start_tv = tv;
#endif
  
  //X-Accel-Redirected requests get their method mangled to GET. De-mangle it if necessary
  if(r->upstream && r->upstream->headers_in.x_accel_redirect) {
    //yep, we got x-accel-redirected. what was the original method?...
    nchan_recover_x_accel_redirected_request_method(r);
  }
  
  if(!nchan_match_origin_header(r, cf, ctx)) {
    goto forbidden;
  }
  
  if((channel_id = nchan_get_channel_id(r, SUB, 1)) == NULL) {
    //just get the subscriber_channel_id for now. the publisher one is handled elsewhere
    return r->headers_out.status ? NGX_OK : NGX_HTTP_INTERNAL_SERVER_ERROR;
  }
  
  if((msg_id = nchan_subscriber_get_msg_id(r)) == NULL) {
    goto bad_msgid;
  }
  
  if(parse_group_limits(r, cf, &group_limits) == NGX_OK) {
    // unless the group already exists, these limits may only be set after this incoming request.
    // TODO: fix this, although that will lead to even gnarlier control flow.
    cf->storage_engine->set_group_limits(nchan_get_group_name(r, cf, ctx), cf, &group_limits, NULL, NULL);
  }
  else {
    // there waas an error parsing group limit strings, and it has already been sent in the response. 
    // just quit.
    return NGX_OK;
  }
  
  if(cf->pub.websocket || cf->pub.http) {
    char *err;
    if(!nchan_parse_message_buffer_config(r, cf, &err)) {
      if(err) {
        nchan_respond_cstring(r, NGX_HTTP_FORBIDDEN, &NCHAN_CONTENT_TYPE_TEXT_PLAIN, err, 0);
        return NGX_OK;
      }
      else {
        nchan_respond_status(r, NGX_HTTP_INTERNAL_SERVER_ERROR, NULL, 0);
        return NGX_OK;
      }
    }
  }
  
  if(nchan_detect_websocket_request(r)) {
    //want websocket?
    if(cf->sub.websocket) {
      //we prefer to subscribe
#if FAKESHARD
      memstore_sub_debug_start();
#endif
      if((msg_id = nchan_subscriber_get_msg_id(r)) == NULL) {
        goto bad_msgid;
      }
      if((sub = websocket_subscriber_create(r, msg_id)) == NULL) {
        nchan_log_request_error(r, "unable to create websocket subscriber");
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
      }
      sub->fn->subscribe(sub, channel_id);
#if FAKESHARD      
      memstore_sub_debug_end();
#endif
    }
    else if(cf->pub.websocket) {
      //no need to subscribe, but keep a connection open for publishing
      nchan_create_websocket_publisher(r);
    }
    else goto forbidden;
    return NGX_DONE;
  }
  else {
    subscriber_t *(*sub_create)(ngx_http_request_t *r, nchan_msg_id_t *msg_id) = NULL;
    
    switch(r->method) {
      case NGX_HTTP_GET:
        if(cf->sub.eventsource && nchan_detect_eventsource_request(r)) {
          sub_create = eventsource_subscriber_create;
        }
        else if(cf->sub.http_chunked && nchan_detect_chunked_subscriber_request(r)) {
          sub_create = http_chunked_subscriber_create;
        }
        else if(cf->sub.http_multipart && nchan_detect_multipart_subscriber_request(r)) {
          sub_create = http_multipart_subscriber_create;
        }
        else if(cf->sub.poll) {
          sub_create = intervalpoll_subscriber_create;
        }
        else if(cf->sub.http_raw_stream) {
          sub_create = http_raw_stream_subscriber_create;
        }
        else if(cf->sub.longpoll) {
          sub_create = longpoll_subscriber_create;
        }
        else if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else {
          goto forbidden;
        }
        
        if(sub_create) {
#if FAKESHARD
          memstore_sub_debug_start();
#endif
          if((msg_id = nchan_subscriber_get_msg_id(r)) == NULL) {
            goto bad_msgid;
          }
          
          if((sub = sub_create(r, msg_id)) == NULL) {
            nchan_log_request_error(r, "unable to create subscriber");
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
          }
          
          sub->fn->subscribe(sub, channel_id);
#if FAKESHARD
          memstore_sub_debug_end();
#endif
        }
        
        break;
      
      case NGX_HTTP_POST:
      case NGX_HTTP_PUT:
        if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else goto forbidden;
        break;
      
      case NGX_HTTP_DELETE:
        if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else goto forbidden;
        break;
      
      case NGX_HTTP_OPTIONS:
        if(cf->pub.http) {
          nchan_OPTIONS_respond(r, &NCHAN_ACCESS_CONTROL_ALLOWED_PUBLISHER_HEADERS, &NCHAN_ALLOW_GET_POST_PUT_DELETE);
        }
        else if(cf->sub.poll || cf->sub.longpoll || cf->sub.eventsource || cf->sub.websocket) {
          nchan_OPTIONS_respond(r, &NCHAN_ACCESS_CONTROL_ALLOWED_SUBSCRIBER_HEADERS, &NCHAN_ALLOW_GET);
        }
        else goto forbidden;
        break;
    }
  }
  ctx->request_ran_content_handler = 1;
  return rc;
  
forbidden:
  nchan_respond_status(r, NGX_HTTP_FORBIDDEN, NULL, 0);
  ctx->request_ran_content_handler = 1;
  return NGX_OK;

bad_msgid:
  nchan_respond_cstring(r, NGX_HTTP_BAD_REQUEST, &NCHAN_CONTENT_TYPE_TEXT_PLAIN, "Message ID invalid", 0);
  ctx->request_ran_content_handler = 1;
  return NGX_OK;
  
}
Exemplo n.º 2
0
ngx_int_t nchan_pubsub_handler(ngx_http_request_t *r) {
  nchan_loc_conf_t       *cf = ngx_http_get_module_loc_conf(r, nchan_module);
  ngx_str_t              *channel_id;
  subscriber_t           *sub;
  nchan_msg_id_t         *msg_id;
  ngx_int_t               rc = NGX_DONE;
  nchan_request_ctx_t    *ctx;
  ngx_str_t              *origin_header;
  
#if NCHAN_BENCHMARK
  struct timeval          tv;
  ngx_gettimeofday(&tv);
#endif
  
  if((ctx = ngx_pcalloc(r->pool, sizeof(nchan_request_ctx_t))) == NULL) {
    return NGX_HTTP_INTERNAL_SERVER_ERROR;
  }
  ngx_http_set_ctx(r, ctx, nchan_module);

#if NCHAN_BENCHMARK
  ctx->start_tv = tv;
#endif
  
  if((origin_header = nchan_get_header_value(r, NCHAN_HEADER_ORIGIN)) != NULL) {
    ctx->request_origin_header = *origin_header;
    if(!(cf->allow_origin.len == 1 && cf->allow_origin.data[0] == '*')) {
      if(!(origin_header->len == cf->allow_origin.len && ngx_strnstr(origin_header->data, (char *)cf->allow_origin.data, origin_header->len) != NULL)) {
        //CORS origin match failed! return a 403 forbidden
        goto forbidden;
      }
    }
  }
  else {
    ctx->request_origin_header.len=0;
    ctx->request_origin_header.data=NULL;
  }
  
  if((channel_id = nchan_get_channel_id(r, SUB, 1)) == NULL) {
    //just get the subscriber_channel_id for now. the publisher one is handled elsewhere
    return r->headers_out.status ? NGX_OK : NGX_HTTP_INTERNAL_SERVER_ERROR;
  }

  if(nchan_detect_websocket_request(r)) {
    //want websocket?
    if(cf->sub.websocket) {
      //we prefer to subscribe
#if FAKESHARD
      memstore_sub_debug_start();
#endif
      if((msg_id = nchan_subscriber_get_msg_id(r)) == NULL) {
        goto bad_msgid;
      }
      if((sub = websocket_subscriber_create(r, msg_id)) == NULL) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "unable to create websocket subscriber");
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
      }
      sub->fn->subscribe(sub, channel_id);
#if FAKESHARD      
      memstore_sub_debug_end();
#endif
    }
    else if(cf->pub.websocket) {
      //no need to subscribe, but keep a connection open for publishing
      //not yet implemented
      nchan_create_websocket_publisher(r);
    }
    else goto forbidden;
    return NGX_DONE;
  }
  else {
    subscriber_t *(*sub_create)(ngx_http_request_t *r, nchan_msg_id_t *msg_id) = NULL;
    
    switch(r->method) {
      case NGX_HTTP_GET:
        if(cf->sub.eventsource && nchan_detect_eventsource_request(r)) {
          sub_create = eventsource_subscriber_create;
        }
        else if(cf->sub.http_chunked && nchan_detect_chunked_subscriber_request(r)) {
          sub_create = http_chunked_subscriber_create;
        }
        else if(cf->sub.http_multipart && nchan_detect_multipart_subscriber_request(r)) {
          sub_create = http_multipart_subscriber_create;
        }
        else if(cf->sub.poll) {
          sub_create = intervalpoll_subscriber_create;
        }
        else if(cf->sub.longpoll) {
          sub_create = longpoll_subscriber_create;
        }
        else if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else {
          goto forbidden;
        }
        
        if(sub_create) {
#if FAKESHARD
          memstore_sub_debug_start();
#endif
          if((msg_id = nchan_subscriber_get_msg_id(r)) == NULL) {
            goto bad_msgid;
          }
          if((sub = sub_create(r, msg_id)) == NULL) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "unable to create subscriber");
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
          }
          
          sub->fn->subscribe(sub, channel_id);
#if FAKESHARD
          memstore_sub_debug_end();
#endif
        }
        
        break;
      
      case NGX_HTTP_POST:
      case NGX_HTTP_PUT:
        if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else goto forbidden;
        break;
      
      case NGX_HTTP_DELETE:
        if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else goto forbidden;
        break;
      
      case NGX_HTTP_OPTIONS:
        if(cf->pub.http) {
          nchan_OPTIONS_respond(r, &cf->allow_origin, &NCHAN_ACCESS_CONTROL_ALLOWED_PUBLISHER_HEADERS, &NCHAN_ALLOW_GET_POST_PUT_DELETE);
        }
        else if(cf->sub.poll || cf->sub.longpoll || cf->sub.eventsource || cf->sub.websocket) {
          nchan_OPTIONS_respond(r, &cf->allow_origin, &NCHAN_ACCESS_CONTROL_ALLOWED_SUBSCRIBER_HEADERS, &NCHAN_ALLOW_GET);
        }
        else goto forbidden;
        break;
    }
  }
  
  return rc;
  
forbidden:
  nchan_respond_status(r, NGX_HTTP_FORBIDDEN, NULL, 0);
  return NGX_OK;

bad_msgid:
  nchan_respond_cstring(r, NGX_HTTP_BAD_REQUEST, &NCHAN_CONTENT_TYPE_TEXT_PLAIN, "Message ID invalid", 0);
  return NGX_OK;
  
}
Exemplo n.º 3
0
ngx_int_t nchan_pubsub_handler(ngx_http_request_t *r) {
  nchan_loc_conf_t       *cf = ngx_http_get_module_loc_conf(r, nchan_module);
  ngx_str_t              *channel_id;
  subscriber_t           *sub;
  nchan_msg_id_t          msg_id = {0}; //memzeroed for debugging
  ngx_int_t               rc = NGX_DONE;
  
  nchan_request_ctx_t    *ctx;
  if((ctx = ngx_pcalloc(r->pool, sizeof(nchan_request_ctx_t))) == NULL) {
    return NGX_HTTP_INTERNAL_SERVER_ERROR;
  }
  ngx_http_set_ctx(r, ctx, nchan_module);
  
  if((channel_id = nchan_get_channel_id(r, SUB, 1)) == NULL) {
    //just get the subscriber_channel_id for now. the publisher one is handled elsewhere
    return r->headers_out.status ? NGX_OK : NGX_HTTP_INTERNAL_SERVER_ERROR;
  }

  if(nchan_detect_websocket_handshake(r)) {
    //want websocket?
    if(cf->sub.websocket) {
      //we prefer to subscribe
      memstore_sub_debug_start();
      nchan_subscriber_get_msg_id(r, &msg_id);
      if((sub = websocket_subscriber_create(r, &msg_id)) == NULL) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "unable to create websocket subscriber");
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
      }
      cf->storage_engine->subscribe(channel_id, sub, (callback_pt )&subscribe_websocket_callback, (void *)r);
      
      memstore_sub_debug_end();
    }
    else if(cf->pub.websocket) {
      //no need to subscribe, but keep a connection open for publishing
      //not yet implemented
      nchan_create_websocket_publisher(r);
    }
    else goto forbidden;
    return NGX_DONE;
  }
  else {
    switch(r->method) {
      case NGX_HTTP_GET:
        if(cf->sub.eventsource && nchan_detect_eventsource_request(r)) {
          memstore_sub_debug_start();
          
          nchan_subscriber_get_msg_id(r, &msg_id);
          if((sub = eventsource_subscriber_create(r, &msg_id)) == NULL) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "unable to create longpoll subscriber");
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
          }
          cf->storage_engine->subscribe(channel_id, sub, (callback_pt )&subscribe_eventsource_callback, (void *)r);
          
          memstore_sub_debug_end();
        }
        else if(cf->sub.poll) {
          memstore_sub_debug_start();
          
          nchan_subscriber_get_msg_id(r, &msg_id);
          assert(msg_id.tagcount == 1);
          
          r->main->count++;
          cf->storage_engine->get_message(channel_id, &msg_id, (callback_pt )&subscribe_intervalpoll_callback, (void *)r);
          memstore_sub_debug_end();
        }
        else if(cf->sub.longpoll) {
          memstore_sub_debug_start();
          
          nchan_subscriber_get_msg_id(r, &msg_id);
          if((sub = longpoll_subscriber_create(r, &msg_id)) == NULL) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "unable to create longpoll subscriber");
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
          }
          cf->storage_engine->subscribe(channel_id, sub, (callback_pt )&subscribe_longpoll_callback, (void *)r);
          
          memstore_sub_debug_end();
        }
        else if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else goto forbidden;
        break;
      
      case NGX_HTTP_POST:
      case NGX_HTTP_PUT:
        if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else goto forbidden;
        break;
      
      case NGX_HTTP_DELETE:
        if(cf->pub.http) {
          nchan_http_publisher_handler(r);
        }
        else goto forbidden;
        break;
      
      case NGX_HTTP_OPTIONS:
        if(cf->pub.http) {
          nchan_OPTIONS_respond(r, &NCHAN_ANYSTRING, &NCHAN_ACCESS_CONTROL_ALLOWED_PUBLISHER_HEADERS, &NCHAN_ALLOW_GET_POST_PUT_DELETE_OPTIONS);
        }
        else if(cf->sub.poll || cf->sub.longpoll || cf->sub.eventsource || cf->sub.websocket) {
          nchan_OPTIONS_respond(r, &NCHAN_ANYSTRING, &NCHAN_ACCESS_CONTROL_ALLOWED_SUBSCRIBER_HEADERS, &NCHAN_ALLOW_GET_OPTIONS);
        }
        else goto forbidden;
        break;
    }
  }
  
  return rc;
  
forbidden:
  nchan_respond_status(r, NGX_HTTP_FORBIDDEN, NULL, 0);
  return NGX_OK;
}