HTTP Callback
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2023-12-01
SRS不支持服务器脚本（参考：服务器端脚本），服务器端定制有一个重要的替代功能，就是HTTP回调。譬如当客户端连接到SRS时，回调指定的http地址，这样可以实现验证功能。
关于Token认证，即基于http回调的认证，参考：Token Authentication
Compile
SRS总是开启HttpCallback。
参考：Build
Config SRS
http hooks的配置如下：
vhost your_vhost {
http_hooks {
# whether the http hooks enable.
# default off.
enabled on;
# when client connect to vhost/app, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_connect",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "tcUrl": "rtmp://video.test.com/live?key=d2fa801d08e3f90ed1e1670e6e52651a",
# "pageUrl": "http://www.test.com/live.html"
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
# support multiple api hooks, format:
# on_connect http://xxx/api0 http://xxx/api1 http://xxx/apiN
on_connect http://127.0.0.1:8085/api/v1/clients http://localhost:8085/api/v1/clients;
# when client close/disconnect to vhost/app/stream, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_close",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "send_bytes": 10240, "recv_bytes": 10240
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
# support multiple api hooks, format:
# on_close http://xxx/api0 http://xxx/api1 http://xxx/apiN
on_close http://127.0.0.1:8085/api/v1/clients http://localhost:8085/api/v1/clients;
# when client(encoder) publish to vhost/app/stream, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_publish",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "stream": "livestream"
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
# support multiple api hooks, format:
# on_publish http://xxx/api0 http://xxx/api1 http://xxx/apiN
on_publish http://127.0.0.1:8085/api/v1/streams http://localhost:8085/api/v1/streams;
# when client(encoder) stop publish to vhost/app/stream, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_unpublish",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "stream": "livestream", "param":"?token=xxx&salt=yyy"
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
# support multiple api hooks, format:
# on_unpublish http://xxx/api0 http://xxx/api1 http://xxx/apiN
on_unpublish http://127.0.0.1:8085/api/v1/streams http://localhost:8085/api/v1/streams;
# when client start to play vhost/app/stream, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_play",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "stream": "livestream", "param":"?token=xxx&salt=yyy",
# "pageUrl": "http://www.test.com/live.html"
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
# support multiple api hooks, format:
# on_play http://xxx/api0 http://xxx/api1 http://xxx/apiN
on_play http://127.0.0.1:8085/api/v1/sessions http://localhost:8085/api/v1/sessions;
# when client stop to play vhost/app/stream, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_stop",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "stream": "livestream", "param":"?token=xxx&salt=yyy"
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
# support multiple api hooks, format:
# on_stop http://xxx/api0 http://xxx/api1 http://xxx/apiN
on_stop http://127.0.0.1:8085/api/v1/sessions http://localhost:8085/api/v1/sessions;
# when srs reap a dvr file, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_dvr",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "stream": "livestream", "param":"?token=xxx&salt=yyy",
# "cwd": "/usr/local/srs",
# "file": "./objs/nginx/html/live/livestream.1420254068776.flv"
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
on_dvr http://127.0.0.1:8085/api/v1/dvrs http://localhost:8085/api/v1/dvrs;
# when srs reap a ts file of hls, call the hook,
# the request in the POST data string is a object encode by json:
# {
# "action": "on_hls",
# "client_id": 1985,
# "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
# "stream": "livestream", "param":"?token=xxx&salt=yyy",
# "duration": 9.36, // in seconds
# "cwd": "/usr/local/srs",
# "file": "./objs/nginx/html/live/livestream/2015-04-23/01/476584165.ts",
# "url": "live/livestream/2015-04-23/01/476584165.ts",
# "m3u8": "./objs/nginx/html/live/livestream/live.m3u8",
# "m3u8_url": "live/livestream/live.m3u8",
# "seq_no": 100
# }
# if valid, the hook must return HTTP code 200(Status OK) and response
# an int value specifies the error code(0 corresponding to success):
# 0
on_hls http://127.0.0.1:8085/api/v1/hls http://localhost:8085/api/v1/hls;
# when srs reap a ts file of hls, call this hook,
# used to push file to cdn network, by get the ts file from cdn network.
# so we use HTTP GET and use the variable following:
# [app], replace with the app.
# [stream], replace with the stream.
# [param], replace with the param.
# [ts_url], replace with the ts url.
# ignore any return data of server.
# @remark random select a url to report, not report all.
on_hls_notify http://127.0.0.1:8085/api/v1/hls/[app]/[stream]/[ts_url][param];
}
}
备注：可以参考conf/full.conf配置文件中的hooks.callback.vhost.com实例。
HTTP callback events
SRS的回调事件包括：
| 事件 | 数据 | 说明 |
|---|---|---|
| on_connect | { "action": "on_connect", "client_id": 1985, "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live", "tcUrl": "rtmp://x/x?key=xxx", "pageUrl": "http://x/x.html" } | 当客户端连接到指定的vhost和app时 |
| on_close | { "action": "on_close", "client_id": 1985, "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live", "send_bytes": 10240, "recv_bytes": 10240 } | 当客户端关闭连接，或者SRS主动关闭连接时 |
| on_publish | { "action": "on_publish", "client_id": 1985, "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live", "stream": "livestream" } | 当客户端发布流时，譬如flash/FMLE方式推流到服务器 |
| on_unpublish | { "action": "on_unpublish", "client_id": 1985, "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live", "stream": "livestream" } | 当客户端停止发布流时 |
| on_play | { "action": "on_play", "client_id": 1985, "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live", "stream": "livestream", "pageUrl": "http://a.com/i.html", "param":"?k=v" } | 当客户端开始播放流时 |
| on_stop | { "action": "on_stop", "client_id": 1985, "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live", "stream": "livestream" } | 当客户端停止播放时。备注：停止播放可能不会关闭连接，还能再继续播放。 |
| on_dvr | { "action": "on_dvr", "client_id": 1985, "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live", "stream": "livestream", "cwd": "/opt", "file": "./l.xxx.flv" } | 当DVR录制关闭一个flv文件时 |
其中，
- 事件：发生该事件时，即回调指定的HTTP地址。
- HTTP地址：可以支持多个，以空格分隔，SRS会依次回调这些接口。
- 数据：SRS将数据POST到HTTP接口。
- 返回值：SRS要求HTTP服务器返回HTTP200并且response内容为整数错误码（0表示成功），其他错误码会断开客户端连接。
默认的HTTP服务器
SRS自带了一个默认的处理HTTP Callback的服务器，启动时需要指定端口，譬如8085端口。
启动方法：python research/api-server/server.py 8085
启动日志如下：
[winlin@dev6 srs]$ python research/api-server/server.py 8085
[2014-02-27 09:42:25][trace] api server listen at port: 8085, static_dir: /home/winlin/git/srs/trunk/research/api-server/static-dir
[2014-02-27 09:42:25][trace] start cherrypy server
[27/Feb/2014:09:42:25] ENGINE Listening for SIGHUP.
[27/Feb/2014:09:42:25] ENGINE Listening for SIGTERM.
[27/Feb/2014:09:42:25] ENGINE Listening for SIGUSR1.
[27/Feb/2014:09:42:25] ENGINE Bus STARTING
[27/Feb/2014:09:42:25] ENGINE Started monitor thread '_TimeoutMonitor'.
[27/Feb/2014:09:42:25] ENGINE Started monitor thread 'Autoreloader'.
[27/Feb/2014:09:42:25] ENGINE Serving on 0.0.0.0:8085
[27/Feb/2014:09:42:25] ENGINE Bus STARTED
推流和播放
推流到SRS时，会调用HTTP接口：
[2014-02-27 09:41:33][trace] post to clients, req={"action":"on_connect","client_id":4,"ip":"192.168.1.179","vhost":"__defaultVhost__","app":"live","pageUrl":""}
[2014-02-27 09:41:33][trace] srs on_connect: client id=4, ip=192.168.1.179, vhost=__defaultVhost__, app=live, pageUrl=
127.0.0.1 - - [27/Feb/2014:09:41:33] "POST /api/v1/clients HTTP/1.1" 200 1 "" "srs(simple rtmp server)0.9.2"
播放SRS的流时，也会调用HTTP接口：
[2014-02-27 09:41:50][trace] post to clients, req={"action":"on_connect","client_id":5,"ip":"192.168.1.179","vhost":"__defaultVhost__","app":"live","pageUrl":"http://dev.chnvideo.com:3080/players/rtmp/"}
[2014-02-27 09:41:50][trace] srs on_connect: client id=5, ip=192.168.1.179, vhost=__defaultVhost__, app=live, pageUrl=http://dev.chnvideo.com:3080/players/rtmp/
127.0.0.1 - - [27/Feb/2014:09:41:50] "POST /api/v1/clients HTTP/1.1" 200 1 "" "srs(simple rtmp server)0.9.2"
Snapshot
HttpCallback也可以用来截图，参考snapshot