Add functional test (PoC)

[pleshakov]

Proposed changes

Functional test uses a OTel collector deployed in a container and configured via provided relay.yaml

I include two approaches on how to deal with Docker:

• Using Docker cli go sdk https://docs.docker.com/engine/api/sdk/examples/
• Using https://golang.testcontainers.org/

To run locally:
go test -v ./tests

Note: the TestContainers runs an additional container https://golang.testcontainers.org/features/garbage_collector/#ryuk

•2024/02/16 15:23:08 github.com/testcontainers/testcontainers-go - Connected to docker:
  Server Version: 24.0.5
  API Version: 1.43
  Operating System: Docker Desktop
  Total Memory: 7851 MB
  Resolved Docker Host: unix:///Users/<REDACTED>/.docker/run/docker.sock
  Resolved Docker Socket Path: /var/run/docker.sock
  Test SessionID: 608c6fc97809c2ab6ad833b50fa3e7d9636c70d5ebbe1337b406179f44e47f32
  Test ProcessID: c59a4d57-e59d-4d3a-8abd-0d6135a9403f
2024/02/16 15:37:23 🐳 Creating container for image testcontainers/ryuk:0.6.0
2024/02/16 15:37:23 ✅ Container created: c500cbc0e657
2024/02/16 15:37:23 🐳 Starting container: c500cbc0e657
2024/02/16 15:37:23 ✅ Container started: c500cbc0e657
2024/02/16 15:37:23 🚧 Waiting for container id c500cbc0e657 image: testcontainers/ryuk:0.6.0. Waiting for: &{Port:8080/tcp timeout:<nil> PollInterval:100ms}
2024/02/16 15:37:23 🔔 Container is ready: c500cbc0e657
2024/02/16 15:37:23 🐳 Creating container for image otel/opentelemetry-collector-contrib:0.88.0
2024/02/16 15:37:23 ✅ Container created: 94a67c1ab239
2024/02/16 15:37:23 🐳 Starting container: 94a67c1ab239
2024/02/16 15:37:24 ✅ Container started: 94a67c1ab239
2024/02/16 15:37:24 🚧 Waiting for container id 94a67c1ab239 image: otel/opentelemetry-collector-contrib:0.88.0. Waiting for: &{timeout:<nil> Log:Everything is ready. Begin running and processing data. IsRegexp:false Occurrence:1 PollInterval:100ms}
2024/02/16 15:37:24 🔔 Container is ready: 94a67c1ab239

Closes #7

Which approach would you prefer?

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING
  guide
• I have proven my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have ensured the README is up to date
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch on my own fork

[github-actions]

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ❌ 1 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 7 package(s) with unknown licenses.

See the Details below.

License Issues

go.mod

Package	Version	License	Issue Type
github.com/shoenig/go-m1cpu	0.1.6	MPL-2.0	Incompatible License
github.com/morikuni/aec	1.0.0	Null	Unknown License
github.com/pkg/errors	0.9.1	Null	Unknown License
golang.org/x/exp	0.0.0-20230510235704-dd950f8aeaea	Null	Unknown License
github.com/gogo/protobuf	1.3.2	Null	Unknown License
github.com/klauspost/compress	1.16.0	Null	Unknown License
github.com/opencontainers/go-digest	1.0.0	Null	Unknown License
github.com/shirou/gopsutil/v3	3.23.12	Null	Unknown License

Allowed Licenses: Apache-1.1, Apache-2.0, BSD-2-Clause, BSD-3-Clause, BSL-1.0, ISC, MIT, NCSA, OpenSSL, Python-2.0, X11

Scanned Manifest Files

go.mod

• dario.cat/[email protected]
• github.com/azure/[email protected]
• github.com/microsoft/[email protected]
• github.com/microsoft/[email protected]
• github.com/containerd/[email protected]
• github.com/containerd/[email protected]
• github.com/cpuguy83/[email protected]
• github.com/distribution/[email protected]
• github.com/docker/[email protected]+incompatible
• github.com/docker/[email protected]
• github.com/docker/[email protected]
• github.com/felixge/[email protected]
• github.com/go-ole/[email protected]
• github.com/gogo/[email protected]
• github.com/google/[email protected]
• github.com/klauspost/[email protected]
• github.com/lufia/[email protected]
• github.com/magiconair/[email protected]
• github.com/moby/[email protected]
• github.com/moby/sys/[email protected]
• github.com/moby/sys/[email protected]
• github.com/moby/[email protected]
• github.com/morikuni/[email protected]
• github.com/opencontainers/[email protected]
• github.com/opencontainers/[email protected]
• github.com/pkg/[email protected]
• github.com/power-devops/[email protected]
• github.com/shirou/gopsutil/[email protected]
• github.com/shoenig/[email protected]
• github.com/sirupsen/[email protected]
• github.com/testcontainers/[email protected]
• github.com/tklauser/[email protected]
• github.com/tklauser/[email protected]
• github.com/yusufpapurcu/[email protected]
• go.opentelemetry.io/contrib/instrumentation/net/http/[email protected]
• golang.org/x/[email protected]

[pleshakov]

Interesting.
@lucacome just to confirm, we don't allow MPL-2.0 license?

Well, using the approach with Docker cli only doesn't cause any license issues -- #15

[lucacome]

@pleshakov it's one of the licenses that can be used but needs to be reviewed case by case.

[sjberman]

I like the container approach better, cleaner look.

[kate-osborn]

I like the container approach better, cleaner look.

Same. Looks easier to work with

[ciarams87]

Same, I like the container approach.

[vepatel]

+1 to the container approach, just easier!

[pleshakov]

thanks for the feedback. We;ll go with the test containers approach