google.golang.org/protobuf v1.36.4: timestamppb.Timestamp

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 google.golang.org/protobuf/types/known/timestamppb.Timestamp in pkg:golang/google.golang.org/protobuf@v1.36.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/protobuf@v1.36.4
Demonstrate these symbols/APIs:
  - google.golang.org/protobuf/types/known/timestamppb.Timestamp

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:sha256:13c64184a24aaaf1a047b8b8f46cf616f8316b8b0f73ab8ff32e08dedfccc84d","contract":["timestamppb.Timestamp{Seconds, Nanos} reports matching values from GetSeconds() and GetNanos() and passes IsValid()/CheckValid() when in range","(*timestamppb.Timestamp).AsTime() converts to UTC time.Time and round-trips through timestamppb.New(t) with proto.Equal equivalence","proto.Marshal and proto.Unmarshal preserve Seconds and Nanos on *timestamppb.Timestamp","(*timestamppb.Timestamp).IsValid() returns false and CheckValid() returns non-nil error when Nanos is outside [0, 999999999] or receiver is nil"],"goal":"verify google.golang.org/protobuf/types/known/timestamppb.Timestamp in pkg:golang/google.golang.org/protobuf@v1.36.4","kind":"HOW","packages":["pkg:golang/google.golang.org/protobuf@v1.36.4"],"schemaVersion":1,"symbols":["google.golang.org/protobuf/types/known/timestamppb.Timestamp"]},"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/google.golang.org/protobuf@v1.36.4"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/protobuf@v1.36.4","symbols":["google.golang.org/protobuf/types/known/timestamppb.Timestamp"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require google.golang.org/protobuf v1.36.4

github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/protobuf v1.36.4 h1:6A3ZDJHn/eNqc1i+IdefRzy/9PokBTPvcqMySR7NNIM=
google.golang.org/protobuf v1.36.4/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/protobuf/types/known/timestamppb.Timestamp in pkg:golang/google.golang.org/protobuf@v1.36.4",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/protobuf@v1.36.4"
  ],
  "symbols": [
    "google.golang.org/protobuf/types/known/timestamppb.Timestamp"
  ]
}

package main

import (
	"fmt"
	"os"
	"time"

	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/timestamppb"
)

func fail(msg string, args ...interface{}) {
	fmt.Fprintf(os.Stderr, msg+"\n", args...)
	os.Exit(1)
}

func main() {
	// 1. Direct construction of timestamppb.Timestamp and getters
	ts := &timestamppb.Timestamp{
		Seconds: 1700000000,
		Nanos:   123456789,
	}
	if ts.GetSeconds() != 1700000000 || ts.GetNanos() != 123456789 {
		fail("unexpected Seconds/Nanos: %d/%d", ts.GetSeconds(), ts.GetNanos())
	}
	if !ts.IsValid() || ts.CheckValid() != nil {
		fail("expected valid timestamp, got err=%v", ts.CheckValid())
	}

	// 2. Conversion to time.Time via AsTime and round-trip via timestamppb.New
	asTime := ts.AsTime()
	if !asTime.Equal(time.Unix(1700000000, 123456789).UTC()) {
		fail("AsTime mismatch: got %v", asTime)
	}
	roundTrip := timestamppb.New(asTime)
	if !proto.Equal(ts, roundTrip) {
		fail("proto.Equal mismatch after New(AsTime())")
	}

	// 3. Proto wire marshal and unmarshal round-trip
	wire, err := proto.Marshal(ts)
	if err != nil || len(wire) == 0 {
		fail("proto.Marshal failed: %v", err)
	}
	decoded := &timestamppb.Timestamp{}
	if err := proto.Unmarshal(wire, decoded); err != nil {
		fail("proto.Unmarshal failed: %v", err)
	}
	if decoded.GetSeconds() != 1700000000 || decoded.GetNanos() != 123456789 {
		fail("unmarshaled Timestamp mismatch: %v", decoded)
	}

	// 4. Out-of-range Nanos validation (Nanos must be in [0, 999999999])
	invalidNanos := &timestamppb.Timestamp{
		Seconds: 1700000000,
		Nanos:   -1,
	}
	if invalidNanos.IsValid() || invalidNanos.CheckValid() == nil {
		fail("expected invalid timestamp for Nanos=-1")
	}

	// 5. Nil receiver safety on getters and validation
	var nilTs *timestamppb.Timestamp
	if nilTs.GetSeconds() != 0 || nilTs.GetNanos() != 0 {
		fail("expected zero getters on nil Timestamp")
	}
	if nilTs.IsValid() || nilTs.CheckValid() == nil {
		fail("expected nil Timestamp to be invalid")
	}
}