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

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.Level 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.Level

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:sha256:320e457a7f3b21f5e91d2907f094d9e5ef115992bcae1f181e65707b16434dc7","contract":["logrus.Level defines logging levels from PanicLevel (0) to TraceLevel (6) and logrus.AllLevels lists all seven levels","logrus.Level.String returns the canonical string representation for each logging level","logrus.ParseLevel parses level strings case-insensitively and returns an error for invalid level names","logrus.Level implements encoding.TextMarshaler and encoding.TextUnmarshaler for text and JSON serialization","Logger.IsLevelEnabled compares logrus.Level thresholds to determine whether entries are emitted or filtered"],"goal":"verify github.com/sirupsen/logrus.Level 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.Level"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","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.Level"],"verifierAdapter":"golang@1"}

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=

package sample

import (
	"encoding/json"

	"github.com/sirupsen/logrus"
)

// LevelData holds a logrus.Level for demonstrating JSON and text serialization.
type LevelData struct {
	Level logrus.Level `json:"level"`
}

// GetAllLevels returns all predefined logrus logging levels.
func GetAllLevels() []logrus.Level {
	return logrus.AllLevels
}

// LevelToString returns the string representation of a logrus.Level.
func LevelToString(l logrus.Level) string {
	return l.String()
}

// ParseLevel wraps logrus.ParseLevel to parse a level string.
func ParseLevel(lvl string) (logrus.Level, error) {
	return logrus.ParseLevel(lvl)
}

// MarshalLevelToJSON serializes a LevelData struct to JSON.
func MarshalLevelToJSON(l logrus.Level) ([]byte, error) {
	return json.Marshal(LevelData{Level: l})
}

// UnmarshalLevelFromJSON deserializes a LevelData struct from JSON.
func UnmarshalLevelFromJSON(data []byte) (logrus.Level, error) {
	var ld LevelData
	if err := json.Unmarshal(data, &ld); err != nil {
		return 0, err
	}
	return ld.Level, nil
}

// LevelFilterLogger wraps a logrus.Logger to demonstrate level filtering and threshold comparison.
type LevelFilterLogger struct {
	Logger *logrus.Logger
}

// NewLevelFilterLogger creates a logger with the given threshold level.
func NewLevelFilterLogger(threshold logrus.Level) *LevelFilterLogger {
	logger := logrus.New()
	logger.SetLevel(threshold)
	return &LevelFilterLogger{
		Logger: logger,
	}
}

// IsEnabled checks whether a given level is enabled for the configured threshold.
func (l *LevelFilterLogger) IsEnabled(lvl logrus.Level) bool {
	return l.Logger.IsLevelEnabled(lvl)
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/sirupsen/logrus.Level 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.Level"
  ]
}

package main

import (
	"bytes"
	"encoding"
	"fmt"
	"os"

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

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

	// Assertion 1: logrus.Level defines logging levels from PanicLevel (0) to TraceLevel (6) and logrus.AllLevels lists all seven levels
	{
		if logrus.PanicLevel != 0 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: PanicLevel expected 0, got %d\n", logrus.PanicLevel)
			os.Exit(1)
		}
		if logrus.FatalLevel != 1 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: FatalLevel expected 1, got %d\n", logrus.FatalLevel)
			os.Exit(1)
		}
		if logrus.ErrorLevel != 2 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: ErrorLevel expected 2, got %d\n", logrus.ErrorLevel)
			os.Exit(1)
		}
		if logrus.WarnLevel != 3 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: WarnLevel expected 3, got %d\n", logrus.WarnLevel)
			os.Exit(1)
		}
		if logrus.InfoLevel != 4 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: InfoLevel expected 4, got %d\n", logrus.InfoLevel)
			os.Exit(1)
		}
		if logrus.DebugLevel != 5 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: DebugLevel expected 5, got %d\n", logrus.DebugLevel)
			os.Exit(1)
		}
		if logrus.TraceLevel != 6 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: TraceLevel expected 6, got %d\n", logrus.TraceLevel)
			os.Exit(1)
		}

		all := sample.GetAllLevels()
		if len(all) != 7 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected 7 levels in AllLevels, got %d\n", len(all))
			os.Exit(1)
		}
		expectedLevels := []logrus.Level{
			logrus.PanicLevel,
			logrus.FatalLevel,
			logrus.ErrorLevel,
			logrus.WarnLevel,
			logrus.InfoLevel,
			logrus.DebugLevel,
			logrus.TraceLevel,
		}
		for i, lvl := range expectedLevels {
			if all[i] != lvl {
				fmt.Fprintf(os.Stderr, "Assertion 1 failed: AllLevels[%d] expected %v, got %v\n", i, lvl, all[i])
				os.Exit(1)
			}
		}
		fmt.Println("  ✓ Assertion 1 passed: logrus.Level constants and AllLevels verified")
	}

	// Assertion 2: logrus.Level.String returns the canonical string representation for each logging level
	{
		expectedStrings := map[logrus.Level]string{
			logrus.PanicLevel: "panic",
			logrus.FatalLevel: "fatal",
			logrus.ErrorLevel: "error",
			logrus.WarnLevel:  "warning",
			logrus.InfoLevel:  "info",
			logrus.DebugLevel: "debug",
			logrus.TraceLevel: "trace",
		}

		for lvl, expectedStr := range expectedStrings {
			actualStr := sample.LevelToString(lvl)
			if actualStr != expectedStr {
				fmt.Fprintf(os.Stderr, "Assertion 2 failed: level %v String() expected %q, got %q\n", lvl, expectedStr, actualStr)
				os.Exit(1)
			}
		}
		fmt.Println("  ✓ Assertion 2 passed: Level.String canonical representations verified")
	}

	// Assertion 3: logrus.ParseLevel parses level strings case-insensitively and returns an error for invalid level names
	{
		validCases := []struct {
			input    string
			expected logrus.Level
		}{
			{"panic", logrus.PanicLevel},
			{"PANIC", logrus.PanicLevel},
			{"fatal", logrus.FatalLevel},
			{"FATAL", logrus.FatalLevel},
			{"error", logrus.ErrorLevel},
			{"ERROR", logrus.ErrorLevel},
			{"warn", logrus.WarnLevel},
			{"warning", logrus.WarnLevel},
			{"WARNING", logrus.WarnLevel},
			{"info", logrus.InfoLevel},
			{"INFO", logrus.InfoLevel},
			{"debug", logrus.DebugLevel},
			{"DEBUG", logrus.DebugLevel},
			{"trace", logrus.TraceLevel},
			{"TRACE", logrus.TraceLevel},
		}

		for _, tc := range validCases {
			lvl, err := sample.ParseLevel(tc.input)
			if err != nil {
				fmt.Fprintf(os.Stderr, "Assertion 3 failed: ParseLevel(%q) unexpected error: %v\n", tc.input, err)
				os.Exit(1)
			}
			if lvl != tc.expected {
				fmt.Fprintf(os.Stderr, "Assertion 3 failed: ParseLevel(%q) expected %v, got %v\n", tc.input, tc.expected, lvl)
				os.Exit(1)
			}
		}

		invalidInputs := []string{"", "unknown", "verbose", "notice", "invalid"}
		for _, inv := range invalidInputs {
			_, err := sample.ParseLevel(inv)
			if err == nil {
				fmt.Fprintf(os.Stderr, "Assertion 3 failed: ParseLevel(%q) expected error, got nil\n", inv)
				os.Exit(1)
			}
		}
		fmt.Println("  ✓ Assertion 3 passed: ParseLevel case-insensitivity and invalid inputs verified")
	}

	// Assertion 4: logrus.Level implements encoding.TextMarshaler and encoding.TextUnmarshaler for text and JSON serialization
	{
		var _ encoding.TextMarshaler = logrus.InfoLevel
		var _ encoding.TextUnmarshaler = (*logrus.Level)(nil)

		// Test MarshalText directly
		text, err := logrus.InfoLevel.MarshalText()
		if err != nil || string(text) != "info" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: MarshalText() expected 'info', got %q (err: %v)\n", string(text), err)
			os.Exit(1)
		}

		// Test UnmarshalText directly
		var unmarshaled logrus.Level
		if err := unmarshaled.UnmarshalText([]byte("warning")); err != nil || unmarshaled != logrus.WarnLevel {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: UnmarshalText('warning') expected WarnLevel, got %v (err: %v)\n", unmarshaled, err)
			os.Exit(1)
		}
		if err := unmarshaled.UnmarshalText([]byte("invalid")); err == nil {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: UnmarshalText('invalid') expected error, got nil\n")
			os.Exit(1)
		}

		// Test JSON round-trip
		jsonBytes, err := sample.MarshalLevelToJSON(logrus.DebugLevel)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: MarshalLevelToJSON error: %v\n", err)
			os.Exit(1)
		}
		if !bytes.Contains(jsonBytes, []byte(`"level":"debug"`)) {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: JSON output expected '\"level\":\"debug\"', got %s\n", string(jsonBytes))
			os.Exit(1)
		}

		decodedLevel, err := sample.UnmarshalLevelFromJSON(jsonBytes)
		if err != nil || decodedLevel != logrus.DebugLevel {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: UnmarshalLevelFromJSON expected DebugLevel, got %v (err: %v)\n", decodedLevel, err)
			os.Exit(1)
		}
		fmt.Println("  ✓ Assertion 4 passed: TextMarshaler and TextUnmarshaler round-trip verified")
	}

	// Assertion 5: Logger.IsLevelEnabled compares logrus.Level thresholds to determine whether entries are emitted or filtered
	{
		logger := sample.NewLevelFilterLogger(logrus.WarnLevel)

		// Levels with higher or equal priority (numerically <= WarnLevel) must be enabled
		if !logger.IsEnabled(logrus.PanicLevel) {
			fmt.Fprintf(os.Stderr, "Assertion 5 failed: PanicLevel should be enabled under WarnLevel\n")
			os.Exit(1)
		}
		if !logger.IsEnabled(logrus.FatalLevel) {
			fmt.Fprintf(os.Stderr, "Assertion 5 failed: FatalLevel should be enabled under WarnLevel\n")
			os.Exit(1)
		}
		if !logger.IsEnabled(logrus.ErrorLevel) {
			fmt.Fprintf(os.Stderr, "Assertion 5 failed: ErrorLevel should be enabled under WarnLevel\n")
			os.Exit(1)
		}
		if !logger.IsEnabled(logrus.WarnLevel) {
			fmt.Fprintf(os.Stderr, "Assertion 5 failed: WarnLevel should be enabled under WarnLevel\n")
			os.Exit(1)
		}

		// Levels with lower priority (numerically > WarnLevel) must be filtered out
		if logger.IsEnabled(logrus.InfoLevel) {
			fmt.Fprintf(os.Stderr, "Assertion 5 failed: InfoLevel should be disabled under WarnLevel\n")
			os.Exit(1)
		}
		if logger.IsEnabled(logrus.DebugLevel) {
			fmt.Fprintf(os.Stderr, "Assertion 5 failed: DebugLevel should be disabled under WarnLevel\n")
			os.Exit(1)
		}
		if logger.IsEnabled(logrus.TraceLevel) {
			fmt.Fprintf(os.Stderr, "Assertion 5 failed: TraceLevel should be disabled under WarnLevel\n")
			os.Exit(1)
		}
		fmt.Println("  ✓ Assertion 5 passed: Logger.IsLevelEnabled threshold logic verified")
	}

	fmt.Println("PASS: all logrus.Level contract assertions passed.")
}