add xTelemetry

Makefile

@@ -34,7 +34,7 @@ gomod.tidy:
 	@$(call run-go-mod-dir,go mod tidy,"go mod tidy")
 
 .PHONY: go.generate
-go.generate: mockery protoc
+go.generate: mockery ensure-buf
 	@$(call run-go-mod-dir,go generate ./...,"go generate")
 
 ## test: Run all tests
@@ -88,10 +88,6 @@ MOCKERY = $(BIN_DIR)/mockery
 mockery:
 	$(call go-get-tool,$(MOCKERY),github.com/vektra/mockery/[email protected])
 
-PROTOC = $(BIN_DIR)/protoc
-protoc:
-	$(call go-get-tool,$(PROTOC),google.golang.org/protobuf/cmd/[email protected])
-
 # go-get-tool will 'go get' any package $2 and install it to $1.
 define go-get-tool
 @[ -f $(1) ] || { \
@@ -124,3 +120,16 @@ for dir in $(filter-out $(2),$(GO_BUILD_DIRS)); do \
 	cd "$(PROJECT_DIR)/$${dir}" && PATH=$(BIN_DIR):$$PATH $(1); \
 done;
 endef
+
+BUF := /usr/local/bin/buf
+ensure-buf: ## Download buf if necessary.
+ifeq (,$(wildcard $(BUF)))
+ifeq (,$(shell which buf 2>/dev/null))
+	@{ \
+	set -e ;\
+	bin/install-buf ;\
+	}
+else
+BUF = $(shell which buf)
+endif
+endif

bin/install-buf

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+BIN="/usr/local/bin" && \
+VERSION="1.28.1" && \
+BINARY_NAME="buf" && \
+({ [[ ! -f "${BIN}/${BINARY_NAME}" ]] || [[ $("${BIN}/${BINARY_NAME}" --version) != "${VERSION}" ]]; } && \
+  echo "Installing buf v${VERSION}" && \
+  curl -sSL \
+  "https://github.com/bufbuild/buf/releases/download/v${VERSION}/${BINARY_NAME}-$(uname -s)-$(uname -m)" \
+  -o "${BIN}/${BINARY_NAME}" && \
+  chmod +x "${BIN}/${BINARY_NAME}") || \
+echo "Buf is already installed"

xproto/buf.gen.yaml

@@ -0,0 +1,7 @@
+version: v1
+
+plugins:
+  - plugin: buf.build/protocolbuffers/go:v1.31.0
+    out: .
+    opt:
+      - paths=source_relative

xproto/buf.lock

@@ -0,0 +1,8 @@
+# Generated by buf. DO NOT EDIT.
+version: v1
+deps:
+  - remote: buf.build
+    owner: googleapis
+    repository: googleapis
+    commit: a86849a25cc04f4dbe9b15ddddfbc488
+    digest: shake256:e19143328f8cbfe13fc226aeee5e63773ca494693a72740a7560664270039a380d94a1344234b88c7691311460df9a9b1c2982190d0a2612eae80368718e1943

xproto/buf.yaml

@@ -0,0 +1,9 @@
+version: v1
+deps:
+- buf.build/googleapis/googleapis
+breaking:
+  use:
+  - FILE
+lint:
+  use:
+  - DEFAULT

xproto/generate.go

@@ -1,4 +1,4 @@
-//go:generate protoc --go_out=. test.proto
+//go:generate buf generate
 //go:generate mv test.pb.go pb_test.go
 
 package xproto

xtel/doc.go

@@ -0,0 +1,2 @@
+// Package xtel provides a set of tools for OpenTelemetry.
+package xtel

xtel/example_test.go

@@ -0,0 +1,22 @@
+package xtel_test
+
+import "github.com/gojekfarm/xtools/xtel"
+
+func ExampleNewProvider() {
+	tp, err := xtel.NewProvider(
+		"service-a",
+		xtel.DisableClientAutoTracing,
+		xtel.SamplingFraction(0.1),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	if err := tp.Start(); err != nil {
+		panic(err)
+	}
+
+	if err := tp.Stop(); err != nil {
+		panic(err)
+	}
+}

xtel/exporter/doc.go

@@ -0,0 +1,2 @@
+// Package exporter contains basic exporters for xtel like stdout and otlp.
+package exporter

xtel/exporter/example_test.go

@@ -0,0 +1,29 @@
+package exporter_test
+
+import (
+	"fmt"
+
+	"github.com/gojekfarm/xtools/xtel"
+	"github.com/gojekfarm/xtools/xtel/exporter"
+)
+
+func ExampleNewOTLP() {
+	_, err := xtel.NewProvider("eg-service", exporter.NewOTLP(exporter.WithTracesExporterInsecure))
+	if err != nil {
+		fmt.Printf("failed exporting traces to exporter: %s\n", err)
+	}
+}
+
+func ExampleNewSTDOut() {
+	_, err := xtel.NewProvider("eg-service", exporter.NewSTDOut(exporter.STDOutOptions{PrettyPrint: true}))
+	if err != nil {
+		fmt.Printf("failed printing traces to terminal: %s\n", err)
+	}
+}
+
+func ExampleNewPrometheus() {
+	_, err := xtel.NewProvider("eg-service", exporter.NewPrometheus(exporter.PrometheusOptions{}))
+	if err != nil {
+		fmt.Printf("failed exporting metrics to prometheus: %s\n", err)
+	}
+}

xtel/exporter/go.mod

@@ -0,0 +1,49 @@
+module github.com/gojekfarm/xtools/xtel/exporter
+
+go 1.20
+
+require (
+	github.com/gojekfarm/xtools/xtel v0.0.0-20230911104033-e5e7b07b8c02
+	github.com/prometheus/client_golang v1.17.0
+	github.com/stretchr/testify v1.8.4
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.21.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.21.0
+	go.opentelemetry.io/otel/exporters/prometheus v0.44.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
+	go.opentelemetry.io/otel/sdk/metric v1.21.0
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.3.0 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.18.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/common v0.44.0 // indirect
+	github.com/prometheus/procfs v0.11.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.1 // indirect
+	go.opentelemetry.io/otel v1.21.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.0.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/sys v0.14.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	google.golang.org/genproto v0.0.0-20231012201019-e917dd12ba7a // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20231012201019-e917dd12ba7a // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20231012201019-e917dd12ba7a // indirect
+	google.golang.org/grpc v1.59.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+replace github.com/gojekfarm/xtools/xtel => ../

xtel/exporter/go.sum

@@ -0,0 +1,90 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cenkalti/backoff/v4 v4.2.1 h1:y4OZtCnogmCPw98Zjyt5a6+QwPLGkiQsYW5oUqylYbM=
+github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
+github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
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+github.com/go-logr/logr v1.3.0 h1:2y3SDp0ZXuc6/cjLSZ+Q3ir+QB9T/iG5yYRXqsagWSY=
+github.com/go-logr/logr v1.3.0/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/golang/glog v1.1.2 h1:DVjP2PbBOzHyzA+dn3WhHIq4NdVu3Q+pvivFICf/7fo=
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+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

xtel/exporter/options.go

@@ -0,0 +1,57 @@
+package exporter
+
+import (
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+)
+
+// Option defines the implementation of the configurations.
+type Option interface{ apply(*config) }
+
+const defaultExporterEndpoint = "127.0.0.1:4317"
+
+type config struct {
+	mode                           Mode
+	exporterEndpoint               string
+	tracesExporterEndpointInsecure bool
+	headers                        map[string]string
+}
+
+func newConfig(opts ...Option) *config {
+	c := &config{
+		headers:          make(map[string]string),
+		exporterEndpoint: defaultExporterEndpoint,
+	}
+
+	for _, opt := range opts {
+		opt.apply(c)
+	}
+
+	return c
+}
+
+func (c *config) grpcOptions() []otlptracegrpc.Option {
+	res := []otlptracegrpc.Option{
+		otlptracegrpc.WithEndpoint(c.exporterEndpoint),
+		otlptracegrpc.WithHeaders(c.headers),
+	}
+
+	if c.tracesExporterEndpointInsecure {
+		res = append(res, otlptracegrpc.WithInsecure())
+	}
+
+	return res
+}
+
+func (c *config) httpOptions() []otlptracehttp.Option {
+	res := []otlptracehttp.Option{
+		otlptracehttp.WithEndpoint(c.exporterEndpoint),
+		otlptracehttp.WithHeaders(c.headers),
+	}
+
+	if c.tracesExporterEndpointInsecure {
+		res = append(res, otlptracehttp.WithInsecure())
+	}
+
+	return res
+}