chore: Dockerfile; simple pod.yaml; otelcol config

.dockerignore

@@ -0,0 +1,3 @@
+.git
+_opam
+_build

resources/Dockerfile

@@ -0,0 +1,21 @@
+FROM ocaml/opam:debian-10-ocaml-4.12 AS build
+WORKDIR /home/opam/ocaml-opentelemetry
+RUN sudo apt-get update && sudo apt-get install pkg-config libcurl4-gnutls-dev -y
+COPY ./opentelemetry-client-ocurl.opam ./
+COPY ./opentelemetry-lwt.opam ./
+COPY ./opentelemetry.opam ./
+RUN opam update && opam install . --deps-only -y
+COPY ./dune ./dune
+COPY ./dune-project ./dune-project
+COPY ./emit1.sh ./emit1.sh
+COPY ./src ./src
+COPY ./tests ./tests
+COPY ./vendor/atomic ./vendor/atomic
+COPY ./vendor/opentelemetry-proto/opentelemetry/proto ./vendor/opentelemetry-proto/opentelemetry/proto
+RUN opam exec -- dune build @all --profile=release
+CMD ["./emit1.sh"]
+
+FROM debian:10 as run
+RUN apt-get update && apt-get install libcurl4-gnutls-dev -y
+COPY --from=build /home/opam/ocaml-opentelemetry/_build/default/tests/emit1.exe /emit1.exe
+ENTRYPOINT ["/emit1.exe"]

resources/Makefile

@@ -0,0 +1,15 @@
+tag=ocaml-otel-test:latest
+
+docker-build:
+	sudo docker buildx build .. -f ./Dockerfile --tag $(tag)
+
+docker-push:
+	sudo docker push $(tag)
+
+kubectl-apply:
+	kubectl apply -f emit-test-pod.yaml
+
+kubectl-delete:
+	kubectl delete -f emit-test-pod.yaml
+
+all: docker-build docker-push kubectl-delete kubectl-apply

resources/emit-test-pod.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: ocaml-otel-test
+spec:
+  containers:
+  - name: emit
+    image: ocaml-otel-test:latest
+    env:
+      - name: HOST_IP
+        valueFrom:
+          fieldRef:
+            fieldPath: status.hostIP
+        # This is picked up by the opentelemetry sdks
+      - name: OTEL_EXPORTER_OTLP_ENDPOINT
+        value: "http://$(HOST_IP):4318"
+      - name: OTEL_RESOURCE_ATTRIBUTES
+        value: "service.name=t1,service.version=1,deployment.environment=poc"
+

resources/otelcol.yaml

@@ -0,0 +1,31 @@
+receivers:
+  otlp:
+    protocols:
+      http:
+
+processors:
+  batch:
+    timeout: 10s
+  resourcedetection:
+    detectors: [gce, system]
+
+exporters:
+  logging:
+    loglevel: debug
+    sampling_initial: 5
+    sampling_thereafter: 10
+
+
+service:
+  telemetry:
+    logs:
+      level: debug
+  pipelines:
+    traces:
+      receivers: [otlp]
+      processors: [batch, resourcedetection]
+      exporters: [logging]
+    metrics:
+      receivers: [otlp]
+      processors: [batch, resourcedetection]
+      exporters: [logging]

tests/emit1.ml

@@ -6,6 +6,9 @@ let (let@) f x = f x
 let sleep_inner = ref 0.1
 let sleep_outer = ref 2.0
 
+let () = Sys.set_signal Sys.sigint (Sys.Signal_handle (fun _ -> exit 0))
+
+
 let run () =
   Printf.printf "collector is on %S\n%!" (Opentelemetry_client_ocurl.get_url());