Add exporter library (#11)

Problem: We need a library to send product telemetry data as OTel to a remote endpoint. Solution: - Add library to pkg/telemetry folder - Add .gitignore - Add Makefile with go-related targets. Testing: - Unit test - Manual testing with OTel collector https://opentelemetry.io/docs/collector/
nginxinc · Feb 16, 2024 · cfbcaf8 · cfbcaf8
1 parent 765a385
commit cfbcaf8
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,17 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Output of the go coverage tool
+cmd-cover.out
+
+# Vim
+*.swp
+*.swo
+
+# GoLand IDE and VSCode
+.idea
+.vscode
diff --git a/Makefile b/Makefile
@@ -0,0 +1,37 @@
+.DEFAULT_GOAL := help
+
+.PHONY: help
+help: Makefile ## Display this help
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "; printf "Usage:\n\n    make \033[36m<target>\033[0m [VARIABLE=value...]\n\nTargets:\n\n"}; {printf "    \033[36m%-30s\033[0m %s\n", $$1, $$2}'
+	@grep -E '^(override )?[a-zA-Z_-]+ \??\+?= .*?## .*$$' $< | sort | awk 'BEGIN {FS = " \\??\\+?= .*?## "; printf "\nVariables:\n\n"}; {gsub(/override /, "", $$1); printf "    \033[36m%-30s\033[0m %s\n", $$1, $$2}'
+
+.PHONY: unit-test
+unit-test:
+	go test ./... -race -coverprofile cmd-cover.out
+
+.PHONY: clean-go-cache
+clean-go-cache: ## Clean go cache
+	@go clean -modcache
+
+.PHONY: deps
+deps: ## Add missing and remove unused modules, verify deps and download them to local cache
+	@go mod tidy && go mod verify && go mod download
+
+.PHONY: fmt
+fmt: ## Run go fmt against code
+	go fmt ./...
+
+.PHONY: vet
+vet: ## Run go vet against code
+	go vet ./...
+
+.PHONY: lint
+lint: ## Run golangci-lint against code
+	docker run --pull always --rm -v $(shell pwd):/telemetry-exporter -w /telemetry-exporter -v $(shell go env GOCACHE):/cache/go -e GOCACHE=/cache/go -e GOLANGCI_LINT_CACHE=/cache/go -v $(shell go env GOPATH)/pkg:/go/pkg golangci/golangci-lint:latest golangci-lint --color always run
+
+.PHONY: dev-all
+dev-all: deps fmt vet lint unit-test ## Run all the development checks
+
+.PHONY: generate
+generate: ## Run go generate
+	go generate ./...
diff --git a/go.mod b/go.mod
@@ -0,0 +1,37 @@
+module github.com/nginxinc/telemetry-exporter
+
+go 1.22.0
+
+require (
+	github.com/go-logr/logr v1.4.1
+	github.com/maxbrunsfeld/counterfeiter/v6 v6.8.1
+	github.com/onsi/ginkgo/v2 v2.15.0
+	github.com/onsi/gomega v1.31.1
+	go.opentelemetry.io/otel v1.23.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.23.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.23.1
+	go.opentelemetry.io/otel/sdk v1.23.1
+)
+
+require (
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.19.0 // indirect
+	go.opentelemetry.io/otel/metric v1.23.1 // indirect
+	go.opentelemetry.io/otel/trace v1.23.1 // indirect
+	go.opentelemetry.io/proto/otlp v1.1.0 // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/net v0.20.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.17.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240102182953-50ed04b92917 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240102182953-50ed04b92917 // indirect
+	google.golang.org/grpc v1.61.0 // indirect
+	google.golang.org/protobuf v1.32.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
@@ -0,0 +1,94 @@
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diff --git a/pkg/telemetry/error_handler.go b/pkg/telemetry/error_handler.go
@@ -0,0 +1,47 @@
+package telemetry
+
+import (
+	"sync"
+
+	"go.opentelemetry.io/otel"
+)
+
+// ErrorHandler capture errors generated by the OpenTelemetry SDK.
+// If multiple errors occur, the last error is captured.
+type ErrorHandler struct {
+	lastError error
+	lock      *sync.Mutex
+}
+
+var _ otel.ErrorHandler = &ErrorHandler{}
+
+// NewErrorHandler creates a new ErrorHandler.
+func NewErrorHandler() *ErrorHandler {
+	return &ErrorHandler{
+		lock: &sync.Mutex{},
+	}
+}
+
+// Handle captures the error.
+func (e *ErrorHandler) Handle(err error) {
+	e.lock.Lock()
+	defer e.lock.Unlock()
+
+	e.lastError = err
+}
+
+// Error returns the last error captured.
+func (e *ErrorHandler) Error() error {
+	e.lock.Lock()
+	defer e.lock.Unlock()
+
+	return e.lastError
+}
+
+// Clear clears the error.
+func (e *ErrorHandler) Clear() {
+	e.lock.Lock()
+	defer e.lock.Unlock()
+
+	e.lastError = nil
+}
diff --git a/pkg/telemetry/error_handler_test.go b/pkg/telemetry/error_handler_test.go
@@ -0,0 +1,30 @@
+package telemetry
+
+import (
+	"errors"
+	"testing"
+
+	. "github.com/onsi/gomega"
+)
+
+func TestErrorHandler(t *testing.T) {
+	g := NewWithT(t)
+
+	testErr1 := errors.New("test error 1")
+	testErr2 := errors.New("test error 2")
+
+	handler := NewErrorHandler()
+	g.Expect(handler.Error()).ToNot(HaveOccurred())
+
+	handler.Clear()
+	g.Expect(handler.Error()).ToNot(HaveOccurred())
+
+	handler.Handle(testErr1)
+	g.Expect(handler.Error()).To(Equal(testErr1))
+
+	handler.Handle(testErr2)
+	g.Expect(handler.Error()).To(Equal(testErr2))
+
+	handler.Clear()
+	g.Expect(handler.Error()).ToNot(HaveOccurred())
+}