github.com/sirupsen/logrus v1.4.2

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 pkg:golang/github.com/sirupsen/logrus@v1.4.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/sirupsen/logrus@v1.4.2

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:sha256:0bbbc18a8effa5cf4bb9f51ab8efb1855b0bcc68ca27da73ec67eb6b66ce0c5d","contract":["logrus.New() returns an initialized Logger with InfoLevel default","logger.SetFormatter(\u0026logrus.JSONFormatter{}) outputs valid JSON logs","logger.WithFields() injects structured fields into the JSON log output","logger.SetLevel(logrus.WarnLevel) filters out debug and info messages","logger.SetFormatter(\u0026logrus.TextFormatter{}) formats logs as text key-value pairs"],"goal":"verify pkg:golang/github.com/sirupsen/logrus@v1.4.2","kind":"HOW","packages":["pkg:golang/github.com/sirupsen/logrus@v1.4.2"],"schemaVersion":1,"symbols":["logrus.New","logrus.WithFields","logrus.JSONFormatter","logrus.TextFormatter"]},"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/github.com/sirupsen/logrus@v1.4.2"],"schemaVersion":1,"subject":"pkg:golang/github.com/sirupsen/logrus@v1.4.2","verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/sirupsen/logrus v1.4.2

require (
	github.com/konsorten/go-windows-terminal-sequences v1.0.1 // indirect
	golang.org/x/sys v0.0.0-20190422165155-953cdadca894 // indirect
)

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/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

package main

import (
	"os"

	"github.com/sirupsen/logrus"
)

func main() {
	logger := logrus.New()
	logger.SetOutput(os.Stdout)
	logger.SetFormatter(&logrus.JSONFormatter{})
	logger.WithFields(logrus.Fields{
		"event":  "startup",
		"status": "ready",
	}).Info("application started")
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/sirupsen/logrus@v1.4.2",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/sirupsen/logrus@v1.4.2"
  ]
}

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"os"
	"strings"

	"github.com/sirupsen/logrus"
)

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

func runTests() error {
	// Assertion 1: logrus.New returns a non-nil Logger with default InfoLevel
	logger := logrus.New()
	if logger == nil {
		return fmt.Errorf("logrus.New() returned nil")
	}
	if logger.GetLevel() != logrus.InfoLevel {
		return fmt.Errorf("expected default level to be InfoLevel, got %v", logger.GetLevel())
	}

	// Assertion 2: Output redirection and JSON formatting
	var buf bytes.Buffer
	logger.SetOutput(&buf)
	logger.SetFormatter(&logrus.JSONFormatter{
		DisableTimestamp: true,
	})

	// Assertion 3: WithFields attaches structured key-values in JSON output
	entry := logger.WithFields(logrus.Fields{
		"service": "order-api",
		"attempt": 1,
	})
	entry.Info("processing order")

	var logData map[string]interface{}
	if err := json.Unmarshal(buf.Bytes(), &logData); err != nil {
		return fmt.Errorf("failed to parse JSON log output: %v, raw: %s", err, buf.String())
	}

	if logData["msg"] != "processing order" {
		return fmt.Errorf("expected msg 'processing order', got %v", logData["msg"])
	}
	if logData["level"] != "info" {
		return fmt.Errorf("expected level 'info', got %v", logData["level"])
	}
	if logData["service"] != "order-api" {
		return fmt.Errorf("expected service 'order-api', got %v", logData["service"])
	}
	if num, ok := logData["attempt"].(float64); !ok || num != 1 {
		return fmt.Errorf("expected attempt 1, got %v", logData["attempt"])
	}

	// Assertion 4: Level filtering
	buf.Reset()
	logger.SetLevel(logrus.WarnLevel)
	logger.Debug("debug should be ignored")
	logger.Info("info should be ignored")
	if buf.Len() != 0 {
		return fmt.Errorf("expected no output for debug/info at WarnLevel, got: %s", buf.String())
	}

	logger.Warn("warning should be logged")
	if !strings.Contains(buf.String(), "warning should be logged") {
		return fmt.Errorf("expected warning in buffer, got: %s", buf.String())
	}

	// Assertion 5: TextFormatter formatting
	buf.Reset()
	logger.SetFormatter(&logrus.TextFormatter{
		DisableColors:    true,
		DisableTimestamp: true,
	})
	logger.Warn("text formatted warning")
	if !strings.Contains(buf.String(), "level=warning") || !strings.Contains(buf.String(), "msg=\"text formatted warning\"") {
		return fmt.Errorf("expected text format output, got: %s", buf.String())
	}

	return nil
}