github.com/google/pprof v0.0.0-20191218002539-d4f498aebedc: profile.Parse

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 profile.Parse in pkg:golang/github.com/google/pprof@v0.0.0-20191218002539-d4f498aebedc
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/google/pprof@v0.0.0-20191218002539-d4f498aebedc
Demonstrate these symbols/APIs:
  - profile.Parse

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:bed3f60b6e667fe779658cf3ee02615315cbee8e2dbf1d8c4aca068ff53f6961","contract":["profile.Parse parses an uncompressed pprof protobuf stream into a valid *profile.Profile with matching Sample and Function records","profile.Parse parses a gzip-compressed pprof protobuf stream into a valid *profile.Profile"],"goal":"verify profile.Parse in pkg:golang/github.com/google/pprof@v0.0.0-20191218002539-d4f498aebedc","kind":"HOW","packages":["pkg:golang/github.com/google/pprof@v0.0.0-20191218002539-d4f498aebedc"],"schemaVersion":1,"symbols":["profile.Parse"]},"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/google/pprof@v0.0.0-20191218002539-d4f498aebedc"],"schemaVersion":1,"subject":"pkg:golang/github.com/google/pprof@v0.0.0-20191218002539-d4f498aebedc","symbols":["profile.Parse"],"verifierAdapter":"golang@1"}

module sample

go 1.21

require github.com/google/pprof v0.0.0-20191218002539-d4f498aebedc

github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/google/pprof v0.0.0-20191218002539-d4f498aebedc h1:DLpL8pWq0v4JYoRpEhDfsJhhJyGKCcQM2WPW2TJs31c=
github.com/google/pprof v0.0.0-20191218002539-d4f498aebedc/go.mod h1:ZgVRPoUq/hfqzAqh7sHMqb3I9Rq5C59dIz2SbBwJ4eM=
github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

{
  "schemaVersion": 1,
  "goal": "verify profile.Parse in pkg:golang/github.com/google/pprof@v0.0.0-20191218002539-d4f498aebedc",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/google/pprof@v0.0.0-20191218002539-d4f498aebedc"
  ],
  "symbols": [
    "profile.Parse"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"

	"github.com/google/pprof/profile"
)

func main() {
	orig := &profile.Profile{
		SampleType: []*profile.ValueType{
			{Type: "cpu", Unit: "nanoseconds"},
		},
		PeriodType:    &profile.ValueType{Type: "cpu", Unit: "nanoseconds"},
		Period:        10000000,
		DurationNanos: 1000000000,
		Function: []*profile.Function{
			{
				ID:         1,
				Name:       "main.compute",
				SystemName: "main.compute",
				Filename:   "main.go",
				StartLine:  10,
			},
		},
	}
	orig.Location = []*profile.Location{
		{
			ID:      1,
			Address: 0x1000,
			Line: []profile.Line{
				{
					Function: orig.Function[0],
					Line:     15,
				},
			},
		},
	}
	orig.Sample = []*profile.Sample{
		{
			Location: []*profile.Location{orig.Location[0]},
			Value:    []int64{50000000},
		},
	}

	var buf bytes.Buffer
	if err := orig.WriteUncompressed(&buf); err != nil {
		fmt.Fprintf(os.Stderr, "WriteUncompressed failed: %v\n", err)
		os.Exit(1)
	}

	parsed, err := profile.Parse(bytes.NewReader(buf.Bytes()))
	if err != nil {
		fmt.Fprintf(os.Stderr, "profile.Parse failed: %v\n", err)
		os.Exit(1)
	}

	if err := parsed.CheckValid(); err != nil {
		fmt.Fprintf(os.Stderr, "CheckValid failed: %v\n", err)
		os.Exit(1)
	}

	if len(parsed.Sample) != 1 || parsed.Sample[0].Value[0] != 50000000 {
		fmt.Fprintf(os.Stderr, "unexpected parsed sample: %+v\n", parsed.Sample)
		os.Exit(1)
	}

	if len(parsed.Function) != 1 || parsed.Function[0].Name != "main.compute" {
		fmt.Fprintf(os.Stderr, "unexpected parsed function: %+v\n", parsed.Function)
		os.Exit(1)
	}

	// Also verify compressed profile parsing via profile.Parse
	var compBuf bytes.Buffer
	if err := orig.Write(&compBuf); err != nil {
		fmt.Fprintf(os.Stderr, "Write failed: %v\n", err)
		os.Exit(1)
	}

	parsedComp, err := profile.Parse(bytes.NewReader(compBuf.Bytes()))
	if err != nil {
		fmt.Fprintf(os.Stderr, "profile.Parse compressed failed: %v\n", err)
		os.Exit(1)
	}

	if len(parsedComp.Sample) != 1 || parsedComp.Sample[0].Value[0] != 50000000 {
		fmt.Fprintf(os.Stderr, "unexpected compressed parsed sample: %+v\n", parsedComp.Sample)
		os.Exit(1)
	}
}