Error whan calling the mock outside of the k6 code

[duarnad]

Hello,

We have a use case where we would like our k6 test to react to be the target of a webhook : k6 makes a call to the service under test, and the service under test signals the end.
To test this use case, we are using curl to send a request to the mock. However, in this case we have the following error:

INFO[0015] 2024/01/25 10:46:36 http: panic serving 10.193.201.116:35838: context canceled at file:///home/raptor/PROJECTS/om-b2w/performance-b2w-g4/k6-scripts/test_xk6-mock.js:7:14(0)
INFO[0015] goroutine 197 [running]:
INFO[0015] net/http.(*conn).serve.func1()
INFO[0015]      net/http/server.go:1854 +0xbf
INFO[0015] panic({0x19154e0, 0xc00182be80})
INFO[0015]      runtime/panic.go:890 +0x263
INFO[0015] github.com/dop251/goja.(*Runtime).wrapJSFunc.func1({0xc00046b810, 0x3, 0x4?})
INFO[0015]      github.com/dop251/goja@v0.0.0-20231027120936-b396bb4c349d/runtime.go:2234 +0x647
INFO[0015] github.com/szkiba/muxpress.middlewareChain.callOne({0x12c1f96?, 0xc002e50250?, 0x18?}, 0xc001e9c200?, 0xc00179e660?, 0xc000e2b950)
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/router.go:23 +0x88
INFO[0015] github.com/szkiba/muxpress.middlewareChain.call({0x2d636f8, 0x0, 0x0}, 0x0?, 0xc0021222a0?, {0xc001e9c200, 0x1, 0xc0021222a0?})
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/router.go:39 +0xf3
INFO[0015] github.com/szkiba/muxpress.(*router).handle.func1()
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/router.go:84 +0x105
INFO[0015] github.com/szkiba/muxpress.(*router).runSync.func1()
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/router.go:70 +0x26
INFO[0015] github.com/szkiba/muxpress.syncRunner.func1(0x48?)
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/options.go:130 +0x8b
INFO[0015] github.com/szkiba/muxpress.(*router).runSync(0xc0018d0940, 0xc00046b7c0)
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/router.go:69 +0x96
INFO[0015] github.com/szkiba/muxpress.(*router).handle(0xc0018d0940, 0xc0027b0c00, {0x1dc9540?, 0xc000c11880}, 0xc002670100, {0xc001e9c200, 0x1, 0x1})
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/router.go:81 +0x115
INFO[0015] github.com/szkiba/muxpress.(*router).handleMethod.func1({0x1dc9540?, 0xc000c11880?}, 0x2d65aa0?)
INFO[0015]      github.com/szkiba/muxpress@v0.1.0/router.go:92 +0x46
INFO[0015] net/http.HandlerFunc.ServeHTTP(0xc00182bcc0?, {0x1dc9540?, 0xc000c11880?}, 0x191f6c0?)
INFO[0015]      net/http/server.go:2122 +0x2f
INFO[0015] github.com/julienschmidt/httprouter.(*Router).Handler.func1({0x1dc9540?, 0xc000c11880?}, 0xc002129230?, {0x0?, 0x0?, 0x0?})
INFO[0015]      github.com/julienschmidt/httprouter@v1.3.0/router.go:275 +0x196
INFO[0015] github.com/julienschmidt/httprouter.(*Router).ServeHTTP(0xc0007c5aa0, {0x1dc9540, 0xc000c11880}, 0xc002670100)
INFO[0015]      github.com/julienschmidt/httprouter@v1.3.0/router.go:387 +0x81c
INFO[0015] net/http.serverHandler.ServeHTTP({0xc002122210?}, {0x1dc9540, 0xc000c11880}, 0xc002670100)
INFO[0015]      net/http/server.go:2936 +0x316
INFO[0015] net/http.(*conn).serve(0xc002367200, {0x1dca298, 0xc0027fe0f0})
INFO[0015]      net/http/server.go:1995 +0x612
INFO[0015] created by net/http.(*Server).Serve
INFO[0015]      net/http/server.go:3089 +0x5ed

Is this is a feature that would be possible to implement ? This could be a nice way to manage such asynchronous flows.

Regards,
Arnaud

[duarnad]

Hello, in fact we understood the problem. As we were requesting the mock from outside, we needed a port. However, we put our code to get the port in the setup method, as we thought that there was a kind of global server. So it happens that there in fact a "mock server" per VU, with its own port, but also a global instance with its own port. When we use one of the ports assigned to a vu, it works well. The "global" one is the one giving the error in my previous comment, maybe in did because there is no VU context.

Regards,
Arnaud