github.com/sirupsen/logrus v1.10.2: NewEntry

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 github.com/sirupsen/logrus.NewEntry in pkg:golang/github.com/sirupsen/logrus@v1.10.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/sirupsen/logrus@v1.10.2
Demonstrate these symbols/APIs:
  - github.com/sirupsen/logrus.NewEntry

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:a9b0b00fc8df9f7f1476fd8a816000bc8fa7e27dfcde1722f2f1f941aa82267b","contract":["NewEntry creates a non-nil Entry referencing the specified Logger","NewEntry allows attaching fields without modifying the logger instance","NewEntry supports error tracking with WithError","NewEntry writes logs with configured formatter output"],"goal":"verify github.com/sirupsen/logrus.NewEntry in pkg:golang/github.com/sirupsen/logrus@v1.10.2","kind":"HOW","packages":["pkg:golang/github.com/sirupsen/logrus@v1.10.2"],"schemaVersion":1,"symbols":["github.com/sirupsen/logrus.NewEntry"]},"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@v1.10.2"],"schemaVersion":1,"subject":"pkg:golang/github.com/sirupsen/logrus@v1.10.2","symbols":["github.com/sirupsen/logrus.NewEntry"],"verifierAdapter":"golang@1"}

package sample

import (
	"github.com/sirupsen/logrus"
)

// CreateEntry instantiates a new Entry bound to the given logger.
func CreateEntry(logger *logrus.Logger) *logrus.Entry {
	return logrus.NewEntry(logger)
}

// CreateEntryWithFields instantiates a new Entry and adds initial fields.
func CreateEntryWithFields(logger *logrus.Logger, fields logrus.Fields) *logrus.Entry {
	entry := logrus.NewEntry(logger)
	return entry.WithFields(fields)
}

module sample

go 1.26.6

require github.com/sirupsen/logrus v1.10.2

require golang.org/x/sys v0.13.0 // indirect

github.com/sirupsen/logrus v1.10.2 h1:G2SED73/qrAu6YwbdxOD6peLkCBI3z7L+ykJFTXJBBo=
github.com/sirupsen/logrus v1.10.2/go.mod h1:SLEg8TqYulVKKfIGHldVp2K2aYz2DKSVBq4g/H5bR7Q=
github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

{
  "schemaVersion": 1,
  "goal": "verify github.com/sirupsen/logrus.NewEntry in pkg:golang/github.com/sirupsen/logrus@v1.10.2",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/sirupsen/logrus@v1.10.2"
  ],
  "symbols": [
    "github.com/sirupsen/logrus.NewEntry"
  ]
}

package main

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

	"github.com/sirupsen/logrus"
	"sample"
)

func main() {
	fmt.Println("Running contract tests for github.com/sirupsen/logrus.NewEntry...")

	// Assertion 1: NewEntry creates a non-nil Entry referencing the specified Logger
	{
		logger := logrus.New()
		entry := sample.CreateEntry(logger)
		if entry == nil {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: entry is nil\n")
			os.Exit(1)
		}
		if entry.Logger != logger {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: entry.Logger does not match logger\n")
			os.Exit(1)
		}
		if entry.Data == nil {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: entry.Data is nil\n")
			os.Exit(1)
		}

		fmt.Println("  ✓ Assertion 1 passed: NewEntry creates a non-nil Entry referencing the specified Logger")
	}

	// Assertion 2: NewEntry allows attaching fields without modifying the logger instance
	{
		logger := logrus.New()
		entry := sample.CreateEntryWithFields(logger, logrus.Fields{
			"component": "auth",
			"attempts":  3,
		})

		if entry.Data["component"] != "auth" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected component=auth, got %v\n", entry.Data["component"])
			os.Exit(1)
		}
		if entry.Data["attempts"] != 3 {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected attempts=3, got %v\n", entry.Data["attempts"])
			os.Exit(1)
		}

		chained := entry.WithField("status", "ok")
		if chained.Data["status"] != "ok" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: chained entry missing status field\n")
			os.Exit(1)
		}

		fmt.Println("  ✓ Assertion 2 passed: NewEntry allows attaching fields without modifying the logger instance")
	}

	// Assertion 3: NewEntry supports error tracking with WithError
	{
		logger := logrus.New()
		entry := sample.CreateEntry(logger)
		testErr := errors.New("operation timeout")
		errEntry := entry.WithError(testErr)

		if errEntry == nil {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: errEntry is nil\n")
			os.Exit(1)
		}
		if errEntry.Data[logrus.ErrorKey] != testErr {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: expected error %v, got %v\n", testErr, errEntry.Data[logrus.ErrorKey])
			os.Exit(1)
		}

		fmt.Println("  ✓ Assertion 3 passed: NewEntry supports error tracking with WithError")
	}

	// Assertion 4: NewEntry writes logs with configured formatter output
	{
		var buf bytes.Buffer
		logger := logrus.New()
		logger.SetOutput(&buf)
		logger.SetFormatter(&logrus.JSONFormatter{})

		entry := sample.CreateEntry(logger)
		entry.WithField("request_id", "req-42").Info("processed successfully")

		var output map[string]interface{}
		if err := json.Unmarshal(buf.Bytes(), &output); err != nil {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: cannot parse json: %v\n", err)
			os.Exit(1)
		}

		if output["request_id"] != "req-42" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: request_id mismatch: %v\n", output["request_id"])
			os.Exit(1)
		}
		if output["msg"] != "processed successfully" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: msg mismatch: %v\n", output["msg"])
			os.Exit(1)
		}
		if output["level"] != "info" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: level mismatch: %v\n", output["level"])
			os.Exit(1)
		}

		fmt.Println("  ✓ Assertion 4 passed: NewEntry writes logs with configured formatter output")
	}

	fmt.Println("All contract assertions passed successfully.")
}