google.golang.org/genproto/googleapis/bytestream v0.0.0-20260311181403-84a4fc48630c: ByteStream_WriteServer

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/genproto/googleapis/bytestream.ByteStream_WriteServer in pkg:golang/google.golang.org/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c
Demonstrate these symbols/APIs:
  - google.golang.org/genproto/googleapis/bytestream.ByteStream_WriteServer

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:eb7fcf43e6c54e65d8de0f933fb2a3743ab0534d4e811ab08d5f59bb325a1a2b","contract":["ByteStream_WriteServer.Recv() returns successive *WriteRequest chunks and io.EOF at the end of the client stream","ByteStream_WriteServer.SendAndClose(*WriteResponse) delivers the final CommittedSize response after FinishWrite"],"goal":"verify google.golang.org/genproto/googleapis/bytestream.ByteStream_WriteServer in pkg:golang/google.golang.org/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c","kind":"HOW","packages":["pkg:golang/google.golang.org/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c"],"schemaVersion":1,"symbols":["google.golang.org/genproto/googleapis/bytestream.ByteStream_WriteServer"]},"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/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c","symbols":["google.golang.org/genproto/googleapis/bytestream.ByteStream_WriteServer"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	google.golang.org/genproto/googleapis/bytestream v0.0.0-20260311181403-84a4fc48630c
	google.golang.org/grpc v1.71.0
)

require (
	golang.org/x/net v0.38.0 // indirect
	golang.org/x/sys v0.31.0 // indirect
	golang.org/x/text v0.23.0 // indirect
	google.golang.org/genproto/googleapis/rpc v0.0.0-20250313205543-e70fdf4c4cb4 // indirect
	google.golang.org/protobuf v1.36.11 // indirect
)

github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
go.opentelemetry.io/otel v1.34.0 h1:zRLXxLCgL1WyKsPVrgbSdMN4c0FMkDAskSTQP+0hdUY=
go.opentelemetry.io/otel v1.34.0/go.mod h1:OWFPOQ+h4G8xpyjgqo4SxJYdDQ/qmRH+wivy7zzx9oI=
go.opentelemetry.io/otel/metric v1.34.0 h1:+eTR3U0MyfWjRDhmFMxe2SsW64QrZ84AOhvqS7Y+PoQ=
go.opentelemetry.io/otel/metric v1.34.0/go.mod h1:CEDrp0fy2D0MvkXE+dPV7cMi8tWZwX3dmaIhwPOaqHE=
go.opentelemetry.io/otel/sdk v1.34.0 h1:95zS4k/2GOy069d321O8jWgYsW3MzVV+KuSPKp7Wr1A=
go.opentelemetry.io/otel/sdk v1.34.0/go.mod h1:0e/pNiaMAqaykJGKbi+tSjWfNNHMTxoC9qANsCzbyxU=
go.opentelemetry.io/otel/sdk/metric v1.34.0 h1:5CeK9ujjbFVL5c1PhLuStg1wxA7vQv7ce1EK0Gyvahk=
go.opentelemetry.io/otel/sdk/metric v1.34.0/go.mod h1:jQ/r8Ze28zRKoNRdkjCZxfs6YvBTG1+YIqyFVFYec5w=
go.opentelemetry.io/otel/trace v1.34.0 h1:+ouXS2V8Rd4hp4580a8q23bg0azF2nI8cqLYnC8mh/k=
go.opentelemetry.io/otel/trace v1.34.0/go.mod h1:Svm7lSjQD7kG7KJ/MUHPVXSDGz2OX4h0M2jHBhmSfRE=
golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8=
golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
google.golang.org/genproto/googleapis/bytestream v0.0.0-20260311181403-84a4fc48630c h1:+1ZxApUanSjTO3aa1JTnk8zG+lZsZyRCZYhLj2lY8l0=
google.golang.org/genproto/googleapis/bytestream v0.0.0-20260311181403-84a4fc48630c/go.mod h1:9amqk/8LQWEC4RjyUxMx1DebyQ7hZB9gvl67bHmgZ2E=
google.golang.org/genproto/googleapis/rpc v0.0.0-20250313205543-e70fdf4c4cb4 h1:iK2jbkWL86DXjEx0qiHcRE9dE4/Ahua5k6V8OWFb//c=
google.golang.org/genproto/googleapis/rpc v0.0.0-20250313205543-e70fdf4c4cb4/go.mod h1:LuRYeWDFV6WOn90g357N17oMCaxpgCnbi/44qJvDn2I=
google.golang.org/grpc v1.71.0 h1:kF77BGdPTQ4/JZWMlb9VpJ5pa25aqvVqogsxNHHdeBg=
google.golang.org/grpc v1.71.0/go.mod h1:H0GRtasmQOh9LkFoCPDu3ZrwUtD1YGE+b2vYBYd/8Ec=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/genproto/googleapis/bytestream.ByteStream_WriteServer in pkg:golang/google.golang.org/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/genproto/googleapis/bytestream@v0.0.0-20260311181403-84a4fc48630c"
  ],
  "symbols": [
    "google.golang.org/genproto/googleapis/bytestream.ByteStream_WriteServer"
  ]
}

package main

import (
	"fmt"
	"io"

	"google.golang.org/genproto/googleapis/bytestream"
	"google.golang.org/grpc"
)

type memoryWriteServer struct {
	grpc.ServerStream
	requests []*bytestream.WriteRequest
	idx      int
	response *bytestream.WriteResponse
}

func (m *memoryWriteServer) Recv() (*bytestream.WriteRequest, error) {
	if m.idx >= len(m.requests) {
		return nil, io.EOF
	}
	req := m.requests[m.idx]
	m.idx++
	return req, nil
}

func (m *memoryWriteServer) SendAndClose(resp *bytestream.WriteResponse) error {
	m.response = resp
	return nil
}

func handleWrite(stream bytestream.ByteStream_WriteServer) error {
	var committed int64
	for {
		req, err := stream.Recv()
		if err == io.EOF {
			return stream.SendAndClose(&bytestream.WriteResponse{
				CommittedSize: committed,
			})
		}
		if err != nil {
			return err
		}
		committed += int64(len(req.GetData()))
		if req.GetFinishWrite() {
			return stream.SendAndClose(&bytestream.WriteResponse{
				CommittedSize: committed,
			})
		}
	}
}

func main() {
	mock := &memoryWriteServer{
		requests: []*bytestream.WriteRequest{
			{
				ResourceName: "uploads/item-1",
				WriteOffset:  0,
				Data:         []byte("hello "),
				FinishWrite:  false,
			},
			{
				WriteOffset: 6,
				Data:        []byte("world"),
				FinishWrite: true,
			},
		},
	}

	var srv bytestream.ByteStream_WriteServer = mock
	if err := handleWrite(srv); err != nil {
		panic(err)
	}
	if mock.response == nil || mock.response.GetCommittedSize() != 11 {
		panic(fmt.Sprintf("unexpected committed size: %v", mock.response))
	}
}