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vendor: add ttrpc as vendored dependency

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Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day
2017-11-21 21:45:29 -08:00
parent e8f52c35ce
commit d54961ccaa
10 changed files with 1027 additions and 0 deletions
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vendor/github.com/stevvooe/ttrpc/LICENSE generated vendored Normal file
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vendor/github.com/stevvooe/ttrpc/README.md generated vendored Normal file
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# ttrpc
GRPC for low-memory environments.
The existing grpc-go project requires a lot of memory overhead for importing
packages and at runtime. While this is great for many services with low density
requirements, this can be a problem when running a large number of services on
a single machine or on a machine with a small amount of memory.
Using the same GRPC definitions, this project reduces the binary size and
protocol overhead required. We do this by eliding the `net/http`, `net/http2`
and `grpc` package used by grpc replacing it with a lightweight framing
protocol. The result are smaller binaries that use less resident memory with
the same ease of use as GRPC.
Please note that while this project supports generating either end of the
protocol, the generated service definitions will be incompatible with regular
GRPC services, as they do not speak the same protocol.
# Usage
Create a gogo vanity binary (see
[`cmd/protoc-gen-gogottrpc/main.go`](cmd/protoc-gen-gogottrpc/main.go) for an
example with the ttrpc plugin enabled.
It's recommended to use [`protobuild`](https://github.com/stevvooe/protobuild)
to build the protobufs for this project, but this will work with protoc
directly, if required.
# Differences from GRPC
- The protocol stack has been replaced with a lighter protocol that doesn't
require http, http2 and tls.
- The client and server interface are identical whereas in GRPC there is a
client and server interface that are different.
- The Go stdlib context package is used instead.
- No support for streams yet.
# Status
Very new. YMMV.
TODO:
- [X] Plumb error codes and GRPC status
- [X] Remove use of any type and dependency on typeurl package
- [X] Ensure that protocol can support streaming in the future
- [ ] Document protocol layout
- [ ] Add testing under concurrent load to ensure
- [ ] Verify connection error handling

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vendor/github.com/stevvooe/ttrpc/channel.go generated vendored Normal file
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package ttrpc
import (
"bufio"
"context"
"encoding/binary"
"io"
"github.com/pkg/errors"
)
const (
messageHeaderLength = 10
messageLengthMax = 8 << 10
)
type messageType uint8
const (
messageTypeRequest messageType = 0x1
messageTypeResponse messageType = 0x2
)
// messageHeader represents the fixed-length message header of 10 bytes sent
// with every request.
type messageHeader struct {
Length uint32 // length excluding this header. b[:4]
StreamID uint32 // identifies which request stream message is a part of. b[4:8]
Type messageType // message type b[8]
Flags uint8 // reserved b[9]
}
func readMessageHeader(p []byte, r io.Reader) (messageHeader, error) {
_, err := io.ReadFull(r, p[:messageHeaderLength])
if err != nil {
return messageHeader{}, err
}
return messageHeader{
Length: binary.BigEndian.Uint32(p[:4]),
StreamID: binary.BigEndian.Uint32(p[4:8]),
Type: messageType(p[8]),
Flags: p[9],
}, nil
}
func writeMessageHeader(w io.Writer, p []byte, mh messageHeader) error {
binary.BigEndian.PutUint32(p[:4], mh.Length)
binary.BigEndian.PutUint32(p[4:8], mh.StreamID)
p[8] = byte(mh.Type)
p[9] = mh.Flags
_, err := w.Write(p[:])
return err
}
type channel struct {
bw *bufio.Writer
br *bufio.Reader
hrbuf [messageHeaderLength]byte // avoid alloc when reading header
hwbuf [messageHeaderLength]byte
}
func newChannel(w io.Writer, r io.Reader) *channel {
return &channel{
bw: bufio.NewWriter(w),
br: bufio.NewReader(r),
}
}
func (ch *channel) recv(ctx context.Context, p []byte) (messageHeader, error) {
mh, err := readMessageHeader(ch.hrbuf[:], ch.br)
if err != nil {
return messageHeader{}, err
}
if mh.Length > uint32(len(p)) {
return messageHeader{}, errors.Wrapf(io.ErrShortBuffer, "message length %v over buffer size %v", mh.Length, len(p))
}
if _, err := io.ReadFull(ch.br, p[:mh.Length]); err != nil {
return messageHeader{}, errors.Wrapf(err, "failed reading message")
}
return mh, nil
}
func (ch *channel) send(ctx context.Context, streamID uint32, t messageType, p []byte) error {
if err := writeMessageHeader(ch.bw, ch.hwbuf[:], messageHeader{Length: uint32(len(p)), StreamID: streamID, Type: t}); err != nil {
return err
}
_, err := ch.bw.Write(p)
if err != nil {
return err
}
return ch.bw.Flush()
}

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vendor/github.com/stevvooe/ttrpc/client.go generated vendored Normal file
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package ttrpc
import (
"context"
"net"
"sync"
"sync/atomic"
"github.com/gogo/protobuf/proto"
"github.com/pkg/errors"
"google.golang.org/grpc/status"
)
type Client struct {
codec codec
channel *channel
requestID uint32
sendRequests chan sendRequest
recvRequests chan recvRequest
closed chan struct{}
closeOnce sync.Once
done chan struct{}
err error
}
func NewClient(conn net.Conn) *Client {
c := &Client{
codec: codec{},
requestID: 1,
channel: newChannel(conn, conn),
sendRequests: make(chan sendRequest),
recvRequests: make(chan recvRequest),
closed: make(chan struct{}),
done: make(chan struct{}),
}
go c.run()
return c
}
func (c *Client) Call(ctx context.Context, service, method string, req, resp interface{}) error {
payload, err := c.codec.Marshal(req)
if err != nil {
return err
}
requestID := atomic.AddUint32(&c.requestID, 2)
request := Request{
Service: service,
Method: method,
Payload: payload,
}
if err := c.send(ctx, requestID, &request); err != nil {
return err
}
var response Response
if err := c.recv(ctx, requestID, &response); err != nil {
return err
}
if err := c.codec.Unmarshal(response.Payload, resp); err != nil {
return err
}
if response.Status == nil {
return errors.New("no status provided on response")
}
return status.ErrorProto(response.Status)
}
func (c *Client) Close() error {
c.closeOnce.Do(func() {
close(c.closed)
})
return nil
}
type sendRequest struct {
ctx context.Context
id uint32
msg interface{}
err chan error
}
func (c *Client) send(ctx context.Context, id uint32, msg interface{}) error {
errs := make(chan error, 1)
select {
case c.sendRequests <- sendRequest{
ctx: ctx,
id: id,
msg: msg,
err: errs,
}:
case <-ctx.Done():
return ctx.Err()
case <-c.done:
return c.err
}
select {
case err := <-errs:
return err
case <-ctx.Done():
return ctx.Err()
case <-c.done:
return c.err
}
}
type recvRequest struct {
id uint32
msg interface{}
err chan error
}
func (c *Client) recv(ctx context.Context, id uint32, msg interface{}) error {
errs := make(chan error, 1)
select {
case c.recvRequests <- recvRequest{
id: id,
msg: msg,
err: errs,
}:
case <-c.done:
return c.err
case <-ctx.Done():
return ctx.Err()
}
select {
case err := <-errs:
return err
case <-c.done:
return c.err
case <-ctx.Done():
return ctx.Err()
}
}
type received struct {
mh messageHeader
p []byte
err error
}
func (c *Client) run() {
defer close(c.done)
var (
waiters = map[uint32]recvRequest{}
queued = map[uint32]received{} // messages unmatched by waiter
incoming = make(chan received)
)
go func() {
// start one more goroutine to recv messages without blocking.
for {
var p [messageLengthMax]byte
mh, err := c.channel.recv(context.TODO(), p[:])
select {
case incoming <- received{
mh: mh,
p: p[:mh.Length],
err: err,
}:
case <-c.done:
return
}
}
}()
for {
select {
case req := <-c.sendRequests:
if p, err := proto.Marshal(req.msg.(proto.Message)); err != nil {
req.err <- err
} else {
req.err <- c.channel.send(req.ctx, req.id, messageTypeRequest, p)
}
case req := <-c.recvRequests:
if r, ok := queued[req.id]; ok {
req.err <- proto.Unmarshal(r.p, req.msg.(proto.Message))
}
waiters[req.id] = req
case r := <-incoming:
if r.err != nil {
c.err = r.err
return
}
if waiter, ok := waiters[r.mh.StreamID]; ok {
waiter.err <- proto.Unmarshal(r.p, waiter.msg.(proto.Message))
} else {
queued[r.mh.StreamID] = r
}
case <-c.closed:
return
}
}
}

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vendor/github.com/stevvooe/ttrpc/codec.go generated vendored Normal file
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package ttrpc
import (
"github.com/gogo/protobuf/proto"
"github.com/pkg/errors"
)
type codec struct{}
func (c codec) Marshal(msg interface{}) ([]byte, error) {
switch v := msg.(type) {
case proto.Message:
return proto.Marshal(v)
default:
return nil, errors.Errorf("ttrpc: cannot marshal unknown type: %T", msg)
}
}
func (c codec) Unmarshal(p []byte, msg interface{}) error {
switch v := msg.(type) {
case proto.Message:
return proto.Unmarshal(p, v)
default:
return errors.Errorf("ttrpc: cannot unmarshal into unknown type: %T", msg)
}
}

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vendor/github.com/stevvooe/ttrpc/plugin/generator.go generated vendored Normal file
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package plugin
import (
"strings"
"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
"github.com/gogo/protobuf/protoc-gen-gogo/generator"
)
type ttrpcGenerator struct {
*generator.Generator
generator.PluginImports
typeurlPkg generator.Single
ttrpcPkg generator.Single
contextPkg generator.Single
}
func init() {
generator.RegisterPlugin(new(ttrpcGenerator))
}
func (p *ttrpcGenerator) Name() string {
return "ttrpc"
}
func (p *ttrpcGenerator) Init(g *generator.Generator) {
p.Generator = g
}
func (p *ttrpcGenerator) Generate(file *generator.FileDescriptor) {
p.PluginImports = generator.NewPluginImports(p.Generator)
p.contextPkg = p.NewImport("context")
p.typeurlPkg = p.NewImport("github.com/containerd/typeurl")
p.ttrpcPkg = p.NewImport("github.com/stevvooe/ttrpc")
for _, service := range file.GetService() {
serviceName := service.GetName()
if pkg := file.GetPackage(); pkg != "" {
serviceName = pkg + "." + serviceName
}
p.genService(serviceName, service)
}
}
func (p *ttrpcGenerator) genService(fullName string, service *descriptor.ServiceDescriptorProto) {
serviceName := service.GetName() + "Service"
p.P()
p.P("type ", serviceName, " interface{")
p.In()
for _, method := range service.Method {
p.P(method.GetName(),
"(ctx ", p.contextPkg.Use(), ".Context, ",
"req *", p.typeName(method.GetInputType()), ") ",
"(*", p.typeName(method.GetOutputType()), ", error)")
}
p.Out()
p.P("}")
p.P()
// registration method
p.P("func Register", serviceName, "(srv *", p.ttrpcPkg.Use(), ".Server, svc ", serviceName, ") {")
p.In()
p.P(`srv.Register("`, fullName, `", map[string]`, p.ttrpcPkg.Use(), ".Method{")
p.In()
for _, method := range service.Method {
p.P(`"`, method.GetName(), `": `, `func(ctx context.Context, unmarshal func(interface{}) error) (interface{}, error) {`)
p.In()
p.P("var req ", p.typeName(method.GetInputType()))
p.P(`if err := unmarshal(&req); err != nil {`)
p.In()
p.P(`return nil, err`)
p.Out()
p.P(`}`)
p.P("return svc.", method.GetName(), "(ctx, &req)")
p.Out()
p.P("},")
}
p.Out()
p.P("})")
p.Out()
p.P("}")
clientType := service.GetName() + "Client"
clientStructType := strings.ToLower(clientType[:1]) + clientType[1:]
p.P()
p.P("type ", clientStructType, " struct{")
p.In()
p.P("client *", p.ttrpcPkg.Use(), ".Client")
p.Out()
p.P("}")
p.P()
p.P("func New", clientType, "(client *", p.ttrpcPkg.Use(), ".Client)", serviceName, "{")
p.In()
p.P("return &", clientStructType, "{")
p.In()
p.P("client: client,")
p.Out()
p.P("}")
p.Out()
p.P("}")
p.P()
for _, method := range service.Method {
p.P()
p.P("func (c *", clientStructType, ") ", method.GetName(),
"(ctx ", p.contextPkg.Use(), ".Context, ",
"req *", p.typeName(method.GetInputType()), ") ",
"(*", p.typeName(method.GetOutputType()), ", error) {")
p.In()
p.P("var resp ", p.typeName(method.GetOutputType()))
p.P("if err := c.client.Call(ctx, ", `"`+fullName+`", `, `"`+method.GetName()+`"`, ", req, &resp); err != nil {")
p.In()
p.P("return nil, err")
p.Out()
p.P("}")
p.P("return &resp, nil")
p.Out()
p.P("}")
}
}
func (p *ttrpcGenerator) objectNamed(name string) generator.Object {
p.Generator.RecordTypeUse(name)
return p.Generator.ObjectNamed(name)
}
func (p *ttrpcGenerator) typeName(str string) string {
return p.Generator.TypeName(p.objectNamed(str))
}

155
vendor/github.com/stevvooe/ttrpc/server.go generated vendored Normal file
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package ttrpc
import (
"context"
"net"
"github.com/containerd/containerd/log"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type Server struct {
services *serviceSet
codec codec
}
func NewServer() *Server {
return &Server{
services: newServiceSet(),
}
}
func (s *Server) Register(name string, methods map[string]Method) {
s.services.register(name, methods)
}
func (s *Server) Shutdown(ctx context.Context) error {
// TODO(stevvooe): Wait on connection shutdown.
return nil
}
func (s *Server) Serve(l net.Listener) error {
for {
conn, err := l.Accept()
if err != nil {
log.L.WithError(err).Error("failed accept")
continue
}
go s.handleConn(conn)
}
return nil
}
func (s *Server) handleConn(conn net.Conn) {
defer conn.Close()
type (
request struct {
id uint32
req *Request
}
response struct {
id uint32
resp *Response
}
)
var (
ch = newChannel(conn, conn)
ctx, cancel = context.WithCancel(context.Background())
responses = make(chan response)
requests = make(chan request)
recvErr = make(chan error, 1)
done = make(chan struct{})
)
defer cancel()
defer close(done)
go func() {
defer close(recvErr)
var p [messageLengthMax]byte
for {
mh, err := ch.recv(ctx, p[:])
if err != nil {
recvErr <- err
return
}
if mh.Type != messageTypeRequest {
// we must ignore this for future compat.
continue
}
var req Request
if err := s.codec.Unmarshal(p[:mh.Length], &req); err != nil {
recvErr <- err
return
}
if mh.StreamID%2 != 1 {
// enforce odd client initiated identifiers.
select {
case responses <- response{
// even though we've had an invalid stream id, we send it
// back on the same stream id so the client knows which
// stream id was bad.
id: mh.StreamID,
resp: &Response{
Status: status.New(codes.InvalidArgument, "StreamID must be odd for client initiated streams").Proto(),
},
}:
case <-done:
}
continue
}
select {
case requests <- request{
id: mh.StreamID,
req: &req,
}:
case <-done:
}
}
}()
for {
select {
case request := <-requests:
go func(id uint32) {
p, status := s.services.call(ctx, request.req.Service, request.req.Method, request.req.Payload)
resp := &Response{
Status: status.Proto(),
Payload: p,
}
select {
case responses <- response{
id: id,
resp: resp,
}:
case <-done:
}
}(request.id)
case response := <-responses:
p, err := s.codec.Marshal(response.resp)
if err != nil {
log.L.WithError(err).Error("failed marshaling response")
return
}
if err := ch.send(ctx, response.id, messageTypeResponse, p); err != nil {
log.L.WithError(err).Error("failed sending message on channel")
return
}
case err := <-recvErr:
log.L.WithError(err).Error("error receiving message")
return
}
}
}

134
vendor/github.com/stevvooe/ttrpc/services.go generated vendored Normal file
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@@ -0,0 +1,134 @@
package ttrpc
import (
"context"
"io"
"os"
"path"
"github.com/gogo/protobuf/proto"
"github.com/pkg/errors"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type Method func(ctx context.Context, unmarshal func(interface{}) error) (interface{}, error)
type ServiceDesc struct {
Methods map[string]Method
// TODO(stevvooe): Add stream support.
}
type serviceSet struct {
services map[string]ServiceDesc
}
func newServiceSet() *serviceSet {
return &serviceSet{
services: make(map[string]ServiceDesc),
}
}
func (s *serviceSet) register(name string, methods map[string]Method) {
if _, ok := s.services[name]; ok {
panic(errors.Errorf("duplicate service %v registered", name))
}
s.services[name] = ServiceDesc{
Methods: methods,
}
}
func (s *serviceSet) call(ctx context.Context, serviceName, methodName string, p []byte) ([]byte, *status.Status) {
p, err := s.dispatch(ctx, serviceName, methodName, p)
st, ok := status.FromError(err)
if !ok {
st = status.New(convertCode(err), err.Error())
}
return p, st
}
func (s *serviceSet) dispatch(ctx context.Context, serviceName, methodName string, p []byte) ([]byte, error) {
method, err := s.resolve(serviceName, methodName)
if err != nil {
return nil, err
}
unmarshal := func(obj interface{}) error {
switch v := obj.(type) {
case proto.Message:
if err := proto.Unmarshal(p, v); err != nil {
return status.Errorf(codes.Internal, "ttrpc: error unmarshaling payload: %v", err.Error())
}
default:
return status.Errorf(codes.Internal, "ttrpc: error unsupported request type: %T", v)
}
return nil
}
resp, err := method(ctx, unmarshal)
if err != nil {
return nil, err
}
switch v := resp.(type) {
case proto.Message:
r, err := proto.Marshal(v)
if err != nil {
return nil, status.Errorf(codes.Internal, "ttrpc: error marshaling payload: %v", err.Error())
}
return r, nil
default:
return nil, status.Errorf(codes.Internal, "ttrpc: error unsupported response type: %T", v)
}
}
func (s *serviceSet) resolve(service, method string) (Method, error) {
srv, ok := s.services[service]
if !ok {
return nil, status.Errorf(codes.NotFound, "service %v", service)
}
mthd, ok := srv.Methods[method]
if !ok {
return nil, status.Errorf(codes.NotFound, "method %v", method)
}
return mthd, nil
}
// convertCode maps stdlib go errors into grpc space.
//
// This is ripped from the grpc-go code base.
func convertCode(err error) codes.Code {
switch err {
case nil:
return codes.OK
case io.EOF:
return codes.OutOfRange
case io.ErrClosedPipe, io.ErrNoProgress, io.ErrShortBuffer, io.ErrShortWrite, io.ErrUnexpectedEOF:
return codes.FailedPrecondition
case os.ErrInvalid:
return codes.InvalidArgument
case context.Canceled:
return codes.Canceled
case context.DeadlineExceeded:
return codes.DeadlineExceeded
}
switch {
case os.IsExist(err):
return codes.AlreadyExists
case os.IsNotExist(err):
return codes.NotFound
case os.IsPermission(err):
return codes.PermissionDenied
}
return codes.Unknown
}
func fullPath(service, method string) string {
return "/" + path.Join("/", service, method)
}

26
vendor/github.com/stevvooe/ttrpc/types.go generated vendored Normal file
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package ttrpc
import (
"fmt"
spb "google.golang.org/genproto/googleapis/rpc/status"
)
type Request struct {
Service string `protobuf:"bytes,1,opt,name=service,proto3"`
Method string `protobuf:"bytes,2,opt,name=method,proto3"`
Payload []byte `protobuf:"bytes,3,opt,name=payload,proto3"`
}
func (r *Request) Reset() { *r = Request{} }
func (r *Request) String() string { return fmt.Sprintf("%+#v", r) }
func (r *Request) ProtoMessage() {}
type Response struct {
Status *spb.Status `protobuf:"bytes,1,opt,name=status,proto3"`
Payload []byte `protobuf:"bytes,2,opt,name=payload,proto3"`
}
func (r *Response) Reset() { *r = Response{} }
func (r *Response) String() string { return fmt.Sprintf("%+#v", r) }
func (r *Response) ProtoMessage() {}