UDP and TCP clients for testing

[samutamm]

Add dummy TCP and UDP clients to facilitate reviewing and testing #234.

Dummy TCP test

Simple TCP test case on single machine:

1. Start easegress-server (based on add tcp/udp proxy feature #234) and create following object:

kind: TCPServer
name: tcp-server-demo
port: 10080
maxConns: 1024
connectTimeout: 3000
pool:
  servers:
    - url: '127.0.0.1:9095'
  loadBalance:
    policy: roundRobin

2. Start dummy TCP backend proxy go run example/backend-service/echo/echo.go tcp
3. Run dummy TCP client program go run example/client/tcp_udp.go tcp
4. Observe messages passing.

Dummy UDP test

1. Start easegress-server and create following object:

kind: UDPServer
name: udp-server-demo
port: 10070
maxConns: 1024
hasResponse: true
clientIdleTimeout: 30000
serverIdleTimeout: 30000
pool:
  servers:
    - url: '127.0.0.1:9095'
  loadBalance:
    policy: roundRobin
ipFilters:
  blockByDefault: false
  allowIPs:
    - 127.0.0.1

2. Run go run example/backend-service/echo/echo.go udp
3. Run go run example/client/tcp_udp.go udp
4. Observe messages passing.

[codecov-commenter]

Codecov Report

Merging #448 (645b737) into main (b3a7327) will increase coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #448      +/-   ##
==========================================
+ Coverage   80.47%   80.69%   +0.21%     
==========================================
  Files          70       70              
  Lines        8094     8154      +60     
==========================================
+ Hits         6514     6580      +66     
+ Misses       1222     1218       -4     
+ Partials      358      356       -2     

Impacted Files	Coverage Δ
pkg/filter/mock/mock.go	90.42% <0.00%> (-4.66%)	⬇️
pkg/filter/proxy/pool.go	80.00% <0.00%> (-2.66%)	⬇️
pkg/object/meshcontroller/spec/spec.go	87.20% <0.00%> (+0.07%)	⬆️
pkg/util/urlclusteranalyzer/urlclusteranalyzer.go	96.10% <0.00%> (+0.38%)	⬆️
pkg/util/jmxtool/agent_controller.go	66.66% <0.00%> (+1.96%)	⬆️
pkg/cluster/cluster.go	52.72% <0.00%> (+2.04%)	⬆️
pkg/filter/proxy/request.go	95.31% <0.00%> (+9.59%)	⬆️

---

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[localvar]

@samutamm , I think we should merge this PR after the TCP/UDP pr, because there's no TCPServer or UDPServer yet.

or, could @jxd134 help add the dummy clients to the TCP/UDP pr directly?

[jxd134]

@samutamm , I think we should merge this PR after the TCP/UDP pr, because there's no TCPServer or UDPServer yet.

or, could @jxd134 help add the dummy clients to the TCP/UDP pr directly?

It will be all right.
See how @samutamm choose.

[samutamm]

@samutamm , I think we should merge this PR after the TCP/UDP pr, because there's no TCPServer or UDPServer yet.
or, could @jxd134 help add the dummy clients to the TCP/UDP pr directly?

It will be all right. See how @samutamm choose.

@jxd134 It would be simpler if you include this kind of dummy clients and maybe the echo server modifications to #234, then we could close this PR #448 .

[jxd134]

@samutamm , I think we should merge this PR after the TCP/UDP pr, because there's no TCPServer or UDPServer yet.
or, could @jxd134 help add the dummy clients to the TCP/UDP pr directly?

It will be all right. See how @samutamm choose.

@jxd134 It would be simpler if you include this kind of dummy clients and maybe the echo server modifications to #234, then we could close this PR #448 .

Get it.

[samutamm]

Close as changes included in #234