Adds dependencies test (#17)

This adds a dependencies test, which will need further refactoring to
support storage types that require dependency-aggregation. However, this
works and keeps the first pass small.

Signed-off-by: Adrian Cole <[email protected]>

Author: codefromthecrypt

charts/zipkin/ci/dependencies-values.yaml

@@ -0,0 +1,45 @@
+---
+global:
+  testDependencies: true
+
+# extra containers are in the same pod, so this means zipkin is accessible to
+# the example services by localhost (default)
+extraContainers:
+  - name: frontend
+    image: 'ghcr.io/openzipkin/brave-example:armeria'
+    command: ['start-frontend']
+    ports:
+      - containerPort: 8081
+    env:
+      - name: 'ZIPKIN_BASEURL'
+        value: 'http://localhost:9411/'
+      - name: 'BACKEND_ENDPOINT'
+        value: 'http://localhost:9000/api'
+    readinessProbe:
+      httpGet:
+        path: /health
+        port: 8081
+      initialDelaySeconds: 5
+      periodSeconds: 5
+  - name: backend
+    image: 'ghcr.io/openzipkin/brave-example:armeria'
+    command: ['start-backend']
+    ports:
+      - containerPort: 9000
+    env:
+      - name: 'ZIPKIN_BASEURL'
+        value: 'http://localhost:9411/'
+    readinessProbe:
+      httpGet:
+        path: /health
+        port: 9000
+      initialDelaySeconds: 5
+      periodSeconds: 5
+
+# test-connection runs in a different pod, so it can't hit the frontend unless
+# we expose a service port.
+extraServicePorts:
+  - port: 8081
+    targetPort: 8081
+    protocol: TCP
+    name: frontend

charts/zipkin/templates/tests/test-connection.yaml

@@ -16,13 +16,31 @@ spec:
       # Make sure zipkin registered in Eureka at startup
       args: [ 'wget -q --spider http://{{ include "zipkin.fullname" . }}:8761/eureka/v2/apps/ZIPKIN' ]
 {{- end }}
+{{ if .Values.global.testDependencies }}
+    - name: get-frontend
+      image: "ghcr.io/openzipkin/alpine:3.19.1"
+      command: [ '/bin/sh', '-c' ]
+      args:  # Get the frontend service 3 times, after it is ready
+        - >
+           while ! wget -q --spider http://{{ include "zipkin.fullname" . }}:8081/health;do sleep 1; done &&
+           for i in 1 2 3;do wget -q --spider http://{{ include "zipkin.fullname" . }}:8081; done
+    - name: get-dependencies
+      image: 'ghcr.io/openzipkin/alpine:3.19.1'
+      command: [ '/bin/sh', '-c' ]
+      args:  # Sleep for the trace to process, then get dependencies based on it
+        - >
+          echo '[{"parent":"frontend","child":"backend","callCount":3}]' > want.json &&
+          sleep 3 &&
+          wget -qO have.json --header "b3: 0" http://{{ include "zipkin.fullname" . }}:{{ .Values.service.port }}/api/v2/dependencies?endTs=$(( $(date +%s) * 1000 )) &&
+          diff -b want.json have.json
+{{ end }}
     - name: get-api
       image: "ghcr.io/openzipkin/alpine:3.19.1"
       command: [ '/bin/sh', '-c' ]
       # Get an arbitrary API endpoint using the ClusterIP and service port
       args: [ 'wget -q --spider --header "b3: cafebabecafebabe-cafebabecafebabe-1" http://{{ include "zipkin.fullname" . }}:{{ .Values.service.port }}/api/v2/services' ]
 {{- if .Values.zipkin.selfTracing.enabled }}
-    - name: get-trace
+    - name: get-self-trace
       image: 'ghcr.io/openzipkin/alpine:3.19.1'
       command: [ '/bin/sh', '-c' ]
       # If self-tracing, sleep for the trace to process. Then, get it by the constant ID passed above.

charts/zipkin/values.schema.json

@@ -65,6 +65,9 @@
         "fullnameOverride": {
             "type": "string"
         },
+        "global": {
+            "type": "object"
+        },
         "image": {
             "type": "object",
             "properties": {

charts/zipkin/values.yaml

@@ -129,3 +129,6 @@ extraServicePorts: []
 #    targetPort: 9410
 #    protocol: TCP
 #    name: scribe
+
+# global variables to use in values. typically used in tests.
+global: {}