Tunnel server/client use websocket protocol.
For example:
-
Arthas tunnel server listen at
192.168.1.10:7777
-
Arthas tunnel client register to the tunnel server
tunnel client connect to tunnel server with URL:
ws://192.168.1.10:7777/ws?method=agentRegister
tunnel server response a text frame message:
response:/?method=agentRegister&id=bvDOe8XbTM2pQWjF4cfw
This connection is
control connection
. -
The browser try connect to remote arthas agent
start connect to tunnel server with URL:
'ws://192.168.1.10:7777/ws?method=connectArthas&id=bvDOe8XbTM2pQWjF4cfw
-
Arthas tunnel server find the
control connection
with the idbvDOe8XbTM2pQWjF4cfw
then send a text frame to arthas tunnel client:
response:/?method=startTunnel&id=bvDOe8XbTM2pQWjF4cfw&clientConnectionId=AMku9EFz2gxeL2gedGOC
-
Arthas tunnel client open a new connection to tunnel server
URL:
ws://192.168.1.10:7777/ws/?method=openTunnel&clientConnectionId=AMku9EFz2gxeL2gedGOC&id=bvDOe8XbTM2pQWjF4cfw
This connection is
tunnel connection
-
Arthas tunnel client start connect to local arthas agent, URL:
ws://127.0.0.1:3658/ws
This connection is
local connection
-
Forward websocket frame between
tunnel connection
andlocal connection
.
+---------+ +----------------------+ +----------------------+ +--------------+
| browser <-----> arthas tunnel server | <-----> arthas tunnel client <--- -> arthas agent |
|---------+ +----------------------+ +----------------------+ +--------------+