go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.19.0: WithHTTPClient

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp.WithHTTPClient in pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp.WithHTTPClient

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:7d0dc744bbd814deaba86788c89e243fb7c4bbd231e81a336c933f009bf598d1","contract":["WithHTTPClient returns an Option configured with the custom *http.Client","otlploghttp.New successfully creates an Exporter when configured with WithHTTPClient","OTLP HTTP log exporter routes log record export requests through the configured http.Client transport","Log pipeline successfully flushes and exporter shuts down cleanly"],"goal":"verify go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp.WithHTTPClient in pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp.WithHTTPClient"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0","symbols":["go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp.WithHTTPClient"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.19.0
	go.opentelemetry.io/otel/log v0.19.0
	go.opentelemetry.io/otel/sdk/log v0.19.0
)

require (
	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
	github.com/cespare/xxhash/v2 v2.3.0 // indirect
	github.com/go-logr/logr v1.4.3 // indirect
	github.com/go-logr/stdr v1.2.2 // indirect
	github.com/google/uuid v1.6.0 // indirect
	github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
	go.opentelemetry.io/otel v1.43.0 // indirect
	go.opentelemetry.io/otel/metric v1.43.0 // indirect
	go.opentelemetry.io/otel/sdk v1.43.0 // indirect
	go.opentelemetry.io/otel/trace v1.43.0 // indirect
	go.opentelemetry.io/proto/otlp v1.10.0 // indirect
	golang.org/x/net v0.52.0 // indirect
	golang.org/x/sys v0.42.0 // indirect
	golang.org/x/text v0.35.0 // indirect
	google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9 // indirect
	google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9 // indirect
	google.golang.org/grpc v1.80.0 // indirect
	google.golang.org/protobuf v1.36.11 // indirect
)

github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/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/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
github.com/go-logr/logr v1.4.3/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/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 h1:HWRh5R2+9EifMyIHV7ZV+MIZqgz+PMpZ14Jynv3O2Zs=
github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0/go.mod h1:JfhWUomR1baixubs02l85lZYYOm7LV6om4ceouMv45c=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
go.opentelemetry.io/otel v1.43.0 h1:mYIM03dnh5zfN7HautFE4ieIig9amkNANT+xcVxAj9I=
go.opentelemetry.io/otel v1.43.0/go.mod h1:JuG+u74mvjvcm8vj8pI5XiHy1zDeoCS2LB1spIq7Ay0=
go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.19.0 h1:HIBTQ3VO5aupLKjC90JgMqpezVXwFuq6Ryjn0/izoag=
go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.19.0/go.mod h1:ji9vId85hMxqfvICA0Jt8JqEdrXaAkcpkI9HPXya0ro=
go.opentelemetry.io/otel/log v0.19.0 h1:KUZs/GOsw79TBBMfDWsXS+KZ4g2Ckzksd1ymzsIEbo4=
go.opentelemetry.io/otel/log v0.19.0/go.mod h1:5DQYeGmxVIr4n0/BcJvF4upsraHjg6vudJJpnkL6Ipk=
go.opentelemetry.io/otel/metric v1.43.0 h1:d7638QeInOnuwOONPp4JAOGfbCEpYb+K6DVWvdxGzgM=
go.opentelemetry.io/otel/metric v1.43.0/go.mod h1:RDnPtIxvqlgO8GRW18W6Z/4P462ldprJtfxHxyKd2PY=
go.opentelemetry.io/otel/sdk v1.43.0 h1:pi5mE86i5rTeLXqoF/hhiBtUNcrAGHLKQdhg4h4V9Dg=
go.opentelemetry.io/otel/sdk v1.43.0/go.mod h1:P+IkVU3iWukmiit/Yf9AWvpyRDlUeBaRg6Y+C58QHzg=
go.opentelemetry.io/otel/sdk/log v0.19.0 h1:scYVLqT22D2gqXItnWiocLUKGH9yvkkeql5dBDiXyko=
go.opentelemetry.io/otel/sdk/log v0.19.0/go.mod h1:vFBowwXGLlW9AvpuF7bMgnNI95LiW10szrOdvzBHlAg=
go.opentelemetry.io/otel/sdk/log/logtest v0.19.0 h1:BEbF7ZBB6qQloV/Ub1+3NQoOUnVtcGkU3XX4Ws3GQfk=
go.opentelemetry.io/otel/sdk/log/logtest v0.19.0/go.mod h1:Lua81/3yM0wOmoHTokLj9y9ADeA02v1naRrVrkAZuKk=
go.opentelemetry.io/otel/sdk/metric v1.43.0 h1:S88dyqXjJkuBNLeMcVPRFXpRw2fuwdvfCGLEo89fDkw=
go.opentelemetry.io/otel/sdk/metric v1.43.0/go.mod h1:C/RJtwSEJ5hzTiUz5pXF1kILHStzb9zFlIEe85bhj6A=
go.opentelemetry.io/otel/trace v1.43.0 h1:BkNrHpup+4k4w+ZZ86CZoHHEkohws8AY+WTX09nk+3A=
go.opentelemetry.io/otel/trace v1.43.0/go.mod h1:/QJhyVBUUswCphDVxq+8mld+AvhXZLhe+8WVFxiFff0=
go.opentelemetry.io/proto/otlp v1.10.0 h1:IQRWgT5srOCYfiWnpqUYz9CVmbO8bFmKcwYxpuCSL2g=
go.opentelemetry.io/proto/otlp v1.10.0/go.mod h1:/CV4QoCR/S9yaPj8utp3lvQPoqMtxXdzn7ozvvozVqk=
golang.org/x/net v0.52.0 h1:He/TN1l0e4mmR3QqHMT2Xab3Aj3L9qjbhRm78/6jrW0=
golang.org/x/net v0.52.0/go.mod h1:R1MAz7uMZxVMualyPXb+VaqGSa3LIaUqk0eEt3w36Sw=
golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9 h1:VPWxll4HlMw1Vs/qXtN7BvhZqsS9cdAittCNvVENElA=
google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9/go.mod h1:7QBABkRtR8z+TEnmXTqIqwJLlzrZKVfAUm7tY3yGv0M=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9 h1:m8qni9SQFH0tJc1X0vmnpw/0t+AImlSvp30sEupozUg=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
google.golang.org/grpc v1.80.0 h1:Xr6m2WmWZLETvUNvIUmeD5OAagMw3FiKmMlTdViWsHM=
google.golang.org/grpc v1.80.0/go.mod h1:ho/dLnxwi3EDJA4Zghp7k2Ec1+c2jqup0bFkw07bwF4=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package sample

import (
	"context"
	"fmt"
	"net/http"

	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp"
	"go.opentelemetry.io/otel/log"
	sdklog "go.opentelemetry.io/otel/sdk/log"
)

// OTLPLogPipeline encapsulates the LoggerProvider and exporter configured with a custom HTTP client.
type OTLPLogPipeline struct {
	Exporter       *otlploghttp.Exporter
	LoggerProvider *sdklog.LoggerProvider
}

// NewOTLPLogPipeline creates a new OTLP HTTP log export pipeline using WithHTTPClient.
func NewOTLPLogPipeline(ctx context.Context, httpClient *http.Client, endpoint string) (*OTLPLogPipeline, error) {
	opts := []otlploghttp.Option{
		otlploghttp.WithHTTPClient(httpClient),
		otlploghttp.WithInsecure(),
	}
	if endpoint != "" {
		opts = append(opts, otlploghttp.WithEndpoint(endpoint))
	}

	exporter, err := otlploghttp.New(ctx, opts...)
	if err != nil {
		return nil, fmt.Errorf("failed to create otlploghttp exporter: %w", err)
	}

	processor := sdklog.NewSimpleProcessor(exporter)
	provider := sdklog.NewLoggerProvider(
		sdklog.WithProcessor(processor),
	)

	return &OTLPLogPipeline{
		Exporter:       exporter,
		LoggerProvider: provider,
	}, nil
}

// EmitLog emits a test log message through the configured pipeline.
func (p *OTLPLogPipeline) EmitLog(ctx context.Context, loggerName string, msg string) {
	logger := p.LoggerProvider.Logger(loggerName)
	var record log.Record
	record.SetBody(log.StringValue(msg))
	record.SetSeverity(log.SeverityInfo)
	record.SetSeverityText("INFO")
	logger.Emit(ctx, record)
}

// Shutdown flushes and shuts down the LoggerProvider.
func (p *OTLPLogPipeline) Shutdown(ctx context.Context) error {
	if p.LoggerProvider == nil {
		return nil
	}
	return p.LoggerProvider.Shutdown(ctx)
}

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp.WithHTTPClient in pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp@v0.19.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp.WithHTTPClient"
  ]
}

package main

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"net/http"
	"os"
	"sync/atomic"
	"time"

	"sample"

	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp"
)

// mockRoundTripper intercepts HTTP requests made by the OTLP exporter.
type mockRoundTripper struct {
	requestCount int32
	lastMethod   string
	lastPath     string
	lastHeader   http.Header
	lastBody     []byte
}

func (m *mockRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
	atomic.AddInt32(&m.requestCount, 1)
	m.lastMethod = req.Method
	m.lastPath = req.URL.Path
	m.lastHeader = req.Header.Clone()
	if req.Body != nil {
		bodyBytes, _ := io.ReadAll(req.Body)
		m.lastBody = bodyBytes
		req.Body = io.NopCloser(bytes.NewBuffer(bodyBytes))
	}

	// Return mock successful OTLP response (empty protobuf message)
	res := &http.Response{
		StatusCode: http.StatusOK,
		Status:     "200 OK",
		Header:     make(http.Header),
		Body:       io.NopCloser(bytes.NewReader(nil)),
		Request:    req,
	}
	res.Header.Set("Content-Type", "application/x-protobuf")
	return res, nil
}

func main() {
	if err := runContractTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract tests passed successfully.")
}

func runContractTests() error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	// 1. WithHTTPClient produces a valid Option that New accepts
	mockTransport := &mockRoundTripper{}
	customClient := &http.Client{
		Transport: mockTransport,
		Timeout:   2 * time.Second,
	}

	opt := otlploghttp.WithHTTPClient(customClient)
	if opt == nil {
		return fmt.Errorf("expected WithHTTPClient to return a non-nil Option")
	}

	// 2. Exporter initializes successfully with WithHTTPClient option
	exp, err := otlploghttp.New(ctx, opt, otlploghttp.WithEndpoint("localhost:4318"), otlploghttp.WithInsecure())
	if err != nil {
		return fmt.Errorf("failed to create exporter with WithHTTPClient: %w", err)
	}
	if exp == nil {
		return fmt.Errorf("expected non-nil exporter")
	}

	// 3. Pipeline correctly routes log exports through the configured HTTP client transport
	pipeline, err := sample.NewOTLPLogPipeline(ctx, customClient, "localhost:4318")
	if err != nil {
		return fmt.Errorf("failed to create OTLPLogPipeline: %w", err)
	}

	pipeline.EmitLog(ctx, "test-logger", "contract verification log message")

	// Flush and shutdown to ensure export batch completes
	if err := pipeline.Shutdown(ctx); err != nil {
		return fmt.Errorf("pipeline shutdown returned error: %w", err)
	}

	// 4. Assert that the custom HTTP client actually handled the OTLP export request
	count := atomic.LoadInt32(&mockTransport.requestCount)
	if count < 1 {
		return fmt.Errorf("expected custom HTTP client to receive at least 1 request, got %d", count)
	}
	if mockTransport.lastMethod != http.MethodPost {
		return fmt.Errorf("expected POST method, got %q", mockTransport.lastMethod)
	}
	if mockTransport.lastPath != "/v1/logs" {
		return fmt.Errorf("expected path '/v1/logs', got %q", mockTransport.lastPath)
	}
	if len(mockTransport.lastBody) == 0 {
		return fmt.Errorf("expected non-empty request body for exported log records")
	}

	// 5. Exporter cleanly shuts down
	if err := exp.Shutdown(ctx); err != nil {
		return fmt.Errorf("exporter shutdown returned error: %v", err)
	}

	return nil
}