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

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 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

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:c46a736e612b1bf1c1890122590551bb22ab6cb3baa99f190981382bc34e1b5b","contract":["bytestream.RegisterByteStreamServer registers an in-memory ByteStreamServer implementation on a grpc.Server","bytestream.NewByteStreamClient(conn).Write streams WriteRequest chunks with ResourceName, WriteOffset, Data, and FinishWrite, returning a WriteResponse with CommittedSize","bytestream.NewByteStreamClient(conn).QueryWriteStatus returns QueryWriteStatusResponse with CommittedSize and Complete=true after FinishWrite","bytestream.NewByteStreamClient(conn).Read streams ReadResponse chunks honoring ReadOffset and ReadLimit"],"goal":"verify 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},"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","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 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"
  ]
}

package main

import (
	"bytes"
	"context"
	"io"
	"log"
	"net"

	"google.golang.org/genproto/googleapis/bytestream"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"google.golang.org/grpc/test/bufconn"
)

type memServer struct {
	bytestream.UnimplementedByteStreamServer
	data     map[string][]byte
	complete map[string]bool
}

func (s *memServer) Write(stream bytestream.ByteStream_WriteServer) error {
	var name string
	for {
		req, err := stream.Recv()
		if err == io.EOF {
			return stream.SendAndClose(&bytestream.WriteResponse{
				CommittedSize: int64(len(s.data[name])),
			})
		}
		if err != nil {
			return err
		}
		if req.GetResourceName() != "" {
			name = req.GetResourceName()
		}
		s.data[name] = append(s.data[name], req.GetData()...)
		if req.GetFinishWrite() {
			s.complete[name] = true
		}
	}
}

func (s *memServer) Read(req *bytestream.ReadRequest, stream bytestream.ByteStream_ReadServer) error {
	b := s.data[req.GetResourceName()]
	offset := int(req.GetReadOffset())
	if offset > len(b) {
		offset = len(b)
	}
	b = b[offset:]
	if limit := int(req.GetReadLimit()); limit > 0 && limit < len(b) {
		b = b[:limit]
	}
	return stream.Send(&bytestream.ReadResponse{Data: b})
}

func (s *memServer) QueryWriteStatus(_ context.Context, req *bytestream.QueryWriteStatusRequest) (*bytestream.QueryWriteStatusResponse, error) {
	name := req.GetResourceName()
	return &bytestream.QueryWriteStatusResponse{
		CommittedSize: int64(len(s.data[name])),
		Complete:      s.complete[name],
	}, nil
}

func main() {
	lis := bufconn.Listen(1024 * 1024)
	srv := grpc.NewServer()
	bytestream.RegisterByteStreamServer(srv, &memServer{
		data:     make(map[string][]byte),
		complete: make(map[string]bool),
	})
	go func() {
		_ = srv.Serve(lis)
	}()
	defer srv.Stop()

	conn, err := grpc.NewClient("passthrough:///bufnet",
		grpc.WithContextDialer(func(context.Context, string) (net.Conn, error) {
			return lis.Dial()
		}),
		grpc.WithTransportCredentials(insecure.NewCredentials()),
	)
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()

	client := bytestream.NewByteStreamClient(conn)
	ctx := context.Background()

	wStream, err := client.Write(ctx)
	if err != nil {
		log.Fatal(err)
	}
	if err := wStream.Send(&bytestream.WriteRequest{
		ResourceName: "blobs/item-1",
		WriteOffset:  0,
		Data:         []byte("hello "),
	}); err != nil {
		log.Fatal(err)
	}
	if err := wStream.Send(&bytestream.WriteRequest{
		WriteOffset: 6,
		Data:        []byte("world"),
		FinishWrite: true,
	}); err != nil {
		log.Fatal(err)
	}
	wResp, err := wStream.CloseAndRecv()
	if err != nil {
		log.Fatal(err)
	}
	if wResp.GetCommittedSize() != 11 {
		log.Fatalf("expected committed size 11, got %d", wResp.GetCommittedSize())
	}

	qResp, err := client.QueryWriteStatus(ctx, &bytestream.QueryWriteStatusRequest{
		ResourceName: "blobs/item-1",
	})
	if err != nil {
		log.Fatal(err)
	}
	if qResp.GetCommittedSize() != 11 || !qResp.GetComplete() {
		log.Fatalf("unexpected query write status: size=%d complete=%v", qResp.GetCommittedSize(), qResp.GetComplete())
	}

	rStream, err := client.Read(ctx, &bytestream.ReadRequest{
		ResourceName: "blobs/item-1",
		ReadOffset:   6,
		ReadLimit:    5,
	})
	if err != nil {
		log.Fatal(err)
	}
	var got bytes.Buffer
	for {
		rResp, err := rStream.Recv()
		if err == io.EOF {
			break
		}
		if err != nil {
			log.Fatal(err)
		}
		got.Write(rResp.GetData())
	}
	if got.String() != "world" {
		log.Fatalf("expected read payload 'world', got %q", got.String())
	}
}