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add containerd/ttrpc f02858b1457c5ca3aaec3a0803eb0d59f96e41d6 

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2019-05-13 21:58:21 -07:00
parent 51de9a883a
commit 41fe464139
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1
vendor.conf
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@ -7,6 +7,7 @@ github.com/containerd/console 0650fd9eeb50bab4fc99dceb9f2e
github.com/containerd/containerd 3a3f0aac8819165839a41fee77a4f4ac8b103097
github.com/containerd/continuity aaeac12a7ffcd198ae25440a9dff125c2e2703a7
github.com/containerd/fifo a9fb20d87448d386e6d50b1f2e1fa70dcf0de43c
github.com/containerd/ttrpc f02858b1457c5ca3aaec3a0803eb0d59f96e41d6
github.com/containerd/typeurl 2a93cfde8c20b23de8eb84a5adbc234ddf7a9e8d
github.com/coreos/etcd d57e8b8d97adfc4a6c224fe116714bf1a1f3beb9 # v3.3.12
github.com/cpuguy83/go-md2man 20f5889cbdc3c73dbd2862796665e7c465ade7d1 # v1.0.8

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Apache License
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http://www.apache.org/licenses/
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# ttrpc
[![Build Status](https://travis-ci.org/containerd/ttrpc.svg?branch=master)](https://travis-ci.org/containerd/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
# Project details
ttrpc is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
As a containerd sub-project, you will find the:
* [Project governance](https://github.com/containerd/project/blob/master/GOVERNANCE.md),
* [Maintainers](https://github.com/containerd/project/blob/master/MAINTAINERS),
* and [Contributing guidelines](https://github.com/containerd/project/blob/master/CONTRIBUTING.md)
information in our [`containerd/project`](https://github.com/containerd/project) repository.

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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ttrpc
import (
"bufio"
"context"
"encoding/binary"
"io"
"net"
"sync"
"github.com/pkg/errors"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
const (
messageHeaderLength = 10
messageLengthMax = 4 << 20
)
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
}
var buffers sync.Pool
type channel struct {
conn net.Conn
bw *bufio.Writer
br *bufio.Reader
hrbuf [messageHeaderLength]byte // avoid alloc when reading header
hwbuf [messageHeaderLength]byte
}
func newChannel(conn net.Conn) *channel {
return &channel{
conn: conn,
bw: bufio.NewWriter(conn),
br: bufio.NewReader(conn),
}
}
// recv a message from the channel. The returned buffer contains the message.
//
// If a valid grpc status is returned, the message header
// returned will be valid and caller should send that along to
// the correct consumer. The bytes on the underlying channel
// will be discarded.
func (ch *channel) recv(ctx context.Context) (messageHeader, []byte, error) {
mh, err := readMessageHeader(ch.hrbuf[:], ch.br)
if err != nil {
return messageHeader{}, nil, err
}
if mh.Length > uint32(messageLengthMax) {
if _, err := ch.br.Discard(int(mh.Length)); err != nil {
return mh, nil, errors.Wrapf(err, "failed to discard after receiving oversized message")
}
return mh, nil, status.Errorf(codes.ResourceExhausted, "message length %v exceed maximum message size of %v", mh.Length, messageLengthMax)
}
p := ch.getmbuf(int(mh.Length))
if _, err := io.ReadFull(ch.br, p); err != nil {
return messageHeader{}, nil, errors.Wrapf(err, "failed reading message")
}
return mh, p, 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()
}
func (ch *channel) getmbuf(size int) []byte {
// we can't use the standard New method on pool because we want to allocate
// based on size.
b, ok := buffers.Get().(*[]byte)
if !ok || cap(*b) < size {
// TODO(stevvooe): It may be better to allocate these in fixed length
// buckets to reduce fragmentation but its not clear that would help
// with performance. An ilogb approach or similar would work well.
bb := make([]byte, size)
b = &bb
} else {
*b = (*b)[:size]
}
return *b
}
func (ch *channel) putmbuf(p []byte) {
buffers.Put(&p)
}

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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ttrpc
import (
"context"
"io"
"net"
"os"
"strings"
"sync"
"syscall"
"time"
"github.com/gogo/protobuf/proto"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"google.golang.org/grpc/status"
)
// ErrClosed is returned by client methods when the underlying connection is
// closed.
var ErrClosed = errors.New("ttrpc: closed")
type Client struct {
codec codec
conn net.Conn
channel *channel
calls chan *callRequest
closed chan struct{}
closeOnce sync.Once
closeFunc func()
done chan struct{}
err error
}
func NewClient(conn net.Conn) *Client {
c := &Client{
codec: codec{},
conn: conn,
channel: newChannel(conn),
calls: make(chan *callRequest),
closed: make(chan struct{}),
done: make(chan struct{}),
closeFunc: func() {},
}
go c.run()
return c
}
type callRequest struct {
ctx context.Context
req *Request
resp *Response // response will be written back here
errs chan error // error written here on completion
}
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
}
var (
creq = &Request{
Service: service,
Method: method,
Payload: payload,
}
cresp = &Response{}
)
if dl, ok := ctx.Deadline(); ok {
creq.TimeoutNano = dl.Sub(time.Now()).Nanoseconds()
}
if err := c.dispatch(ctx, creq, cresp); err != nil {
return err
}
if err := c.codec.Unmarshal(cresp.Payload, resp); err != nil {
return err
}
if cresp.Status == nil {
return errors.New("no status provided on response")
}
return status.ErrorProto(cresp.Status)
}
func (c *Client) dispatch(ctx context.Context, req *Request, resp *Response) error {
errs := make(chan error, 1)
call := &callRequest{
ctx: ctx,
req: req,
resp: resp,
errs: errs,
}
select {
case <-ctx.Done():
return ctx.Err()
case c.calls <- call:
case <-c.done:
return c.err
}
select {
case <-ctx.Done():
return ctx.Err()
case err := <-errs:
return filterCloseErr(err)
case <-c.done:
return c.err
}
}
func (c *Client) Close() error {
c.closeOnce.Do(func() {
close(c.closed)
})
return nil
}
// OnClose allows a close func to be called when the server is closed
func (c *Client) OnClose(closer func()) {
c.closeFunc = closer
}
type message struct {
messageHeader
p []byte
err error
}
func (c *Client) run() {
var (
streamID uint32 = 1
waiters = make(map[uint32]*callRequest)
calls = c.calls
incoming = make(chan *message)
shutdown = make(chan struct{})
shutdownErr error
)
go func() {
defer close(shutdown)
// start one more goroutine to recv messages without blocking.
for {
mh, p, err := c.channel.recv(context.TODO())
if err != nil {
_, ok := status.FromError(err)
if !ok {
// treat all errors that are not an rpc status as terminal.
// all others poison the connection.
shutdownErr = err
return
}
}
select {
case incoming <- &message{
messageHeader: mh,
p: p[:mh.Length],
err: err,
}:
case <-c.done:
return
}
}
}()
defer c.conn.Close()
defer close(c.done)
defer c.closeFunc()
for {
select {
case call := <-calls:
if err := c.send(call.ctx, streamID, messageTypeRequest, call.req); err != nil {
call.errs <- err
continue
}
waiters[streamID] = call
streamID += 2 // enforce odd client initiated request ids
case msg := <-incoming:
call, ok := waiters[msg.StreamID]
if !ok {
logrus.Errorf("ttrpc: received message for unknown channel %v", msg.StreamID)
continue
}
call.errs <- c.recv(call.resp, msg)
delete(waiters, msg.StreamID)
case <-shutdown:
if shutdownErr != nil {
shutdownErr = filterCloseErr(shutdownErr)
} else {
shutdownErr = ErrClosed
}
shutdownErr = errors.Wrapf(shutdownErr, "ttrpc: client shutting down")
c.err = shutdownErr
for _, waiter := range waiters {
waiter.errs <- shutdownErr
}
c.Close()
return
case <-c.closed:
if c.err == nil {
c.err = ErrClosed
}
// broadcast the shutdown error to the remaining waiters.
for _, waiter := range waiters {
waiter.errs <- c.err
}
return
}
}
}
func (c *Client) send(ctx context.Context, streamID uint32, mtype messageType, msg interface{}) error {
p, err := c.codec.Marshal(msg)
if err != nil {
return err
}
return c.channel.send(ctx, streamID, mtype, p)
}
func (c *Client) recv(resp *Response, msg *message) error {
if msg.err != nil {
return msg.err
}
if msg.Type != messageTypeResponse {
return errors.New("unkown message type received")
}
defer c.channel.putmbuf(msg.p)
return proto.Unmarshal(msg.p, resp)
}
// filterCloseErr rewrites EOF and EPIPE errors to ErrClosed. Use when
// returning from call or handling errors from main read loop.
//
// This purposely ignores errors with a wrapped cause.
func filterCloseErr(err error) error {
if err == nil {
return nil
}
if err == io.EOF {
return ErrClosed
}
if strings.Contains(err.Error(), "use of closed network connection") {
return ErrClosed
}
// if we have an epipe on a write, we cast to errclosed
if oerr, ok := err.(*net.OpError); ok && oerr.Op == "write" {
if serr, ok := oerr.Err.(*os.SyscallError); ok && serr.Err == syscall.EPIPE {
return ErrClosed
}
}
return err
}

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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
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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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ttrpc
import "github.com/pkg/errors"
type serverConfig struct {
handshaker Handshaker
}
type ServerOpt func(*serverConfig) error
// WithServerHandshaker can be passed to NewServer to ensure that the
// handshaker is called before every connection attempt.
//
// Only one handshaker is allowed per server.
func WithServerHandshaker(handshaker Handshaker) ServerOpt {
return func(c *serverConfig) error {
if c.handshaker != nil {
return errors.New("only one handshaker allowed per server")
}
c.handshaker = handshaker
return nil
}
}

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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ttrpc
import (
"context"
"net"
)
// Handshaker defines the interface for connection handshakes performed on the
// server or client when first connecting.
type Handshaker interface {
// Handshake should confirm or decorate a connection that may be incoming
// to a server or outgoing from a client.
//
// If this returns without an error, the caller should use the connection
// in place of the original connection.
//
// The second return value can contain credential specific data, such as
// unix socket credentials or TLS information.
//
// While we currently only have implementations on the server-side, this
// interface should be sufficient to implement similar handshakes on the
// client-side.
Handshake(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error)
}
type handshakerFunc func(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error)
func (fn handshakerFunc) Handshake(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error) {
return fn(ctx, conn)
}
func noopHandshake(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error) {
return conn, nil, nil
}

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vendor/github.com/containerd/ttrpc/server.go generated vendored Normal file
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ttrpc
import (
"context"
"io"
"math/rand"
"net"
"sync"
"sync/atomic"
"time"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var (
ErrServerClosed = errors.New("ttrpc: server closed")
)
type Server struct {
config *serverConfig
services *serviceSet
codec codec
mu sync.Mutex
listeners map[net.Listener]struct{}
connections map[*serverConn]struct{} // all connections to current state
done chan struct{} // marks point at which we stop serving requests
}
func NewServer(opts ...ServerOpt) (*Server, error) {
config := &serverConfig{}
for _, opt := range opts {
if err := opt(config); err != nil {
return nil, err
}
}
return &Server{
config: config,
services: newServiceSet(),
done: make(chan struct{}),
listeners: make(map[net.Listener]struct{}),
connections: make(map[*serverConn]struct{}),
}, nil
}
func (s *Server) Register(name string, methods map[string]Method) {
s.services.register(name, methods)
}
func (s *Server) Serve(ctx context.Context, l net.Listener) error {
s.addListener(l)
defer s.closeListener(l)
var (
backoff time.Duration
handshaker = s.config.handshaker
)
if handshaker == nil {
handshaker = handshakerFunc(noopHandshake)
}
for {
conn, err := l.Accept()
if err != nil {
select {
case <-s.done:
return ErrServerClosed
default:
}
if terr, ok := err.(interface {
Temporary() bool
}); ok && terr.Temporary() {
if backoff == 0 {
backoff = time.Millisecond
} else {
backoff *= 2
}
if max := time.Second; backoff > max {
backoff = max
}
sleep := time.Duration(rand.Int63n(int64(backoff)))
logrus.WithError(err).Errorf("ttrpc: failed accept; backoff %v", sleep)
time.Sleep(sleep)
continue
}
return err
}
backoff = 0
approved, handshake, err := handshaker.Handshake(ctx, conn)
if err != nil {
logrus.WithError(err).Errorf("ttrpc: refusing connection after handshake")
conn.Close()
continue
}
sc := s.newConn(approved, handshake)
go sc.run(ctx)
}
}
func (s *Server) Shutdown(ctx context.Context) error {
s.mu.Lock()
select {
case <-s.done:
default:
// protected by mutex
close(s.done)
}
lnerr := s.closeListeners()
s.mu.Unlock()
ticker := time.NewTicker(200 * time.Millisecond)
defer ticker.Stop()
for {
if s.closeIdleConns() {
return lnerr
}
select {
case <-ctx.Done():
return ctx.Err()
case <-ticker.C:
}
}
}
// Close the server without waiting for active connections.
func (s *Server) Close() error {
s.mu.Lock()
defer s.mu.Unlock()
select {
case <-s.done:
default:
// protected by mutex
close(s.done)
}
err := s.closeListeners()
for c := range s.connections {
c.close()
delete(s.connections, c)
}
return err
}
func (s *Server) addListener(l net.Listener) {
s.mu.Lock()
defer s.mu.Unlock()
s.listeners[l] = struct{}{}
}
func (s *Server) closeListener(l net.Listener) error {
s.mu.Lock()
defer s.mu.Unlock()
return s.closeListenerLocked(l)
}
func (s *Server) closeListenerLocked(l net.Listener) error {
defer delete(s.listeners, l)
return l.Close()
}
func (s *Server) closeListeners() error {
var err error
for l := range s.listeners {
if cerr := s.closeListenerLocked(l); cerr != nil && err == nil {
err = cerr
}
}
return err
}
func (s *Server) addConnection(c *serverConn) {
s.mu.Lock()
defer s.mu.Unlock()
s.connections[c] = struct{}{}
}
func (s *Server) closeIdleConns() bool {
s.mu.Lock()
defer s.mu.Unlock()
quiescent := true
for c := range s.connections {
st, ok := c.getState()
if !ok || st != connStateIdle {
quiescent = false
continue
}
c.close()
delete(s.connections, c)
}
return quiescent
}
type connState int
const (
connStateActive = iota + 1 // outstanding requests
connStateIdle // no requests
connStateClosed // closed connection
)
func (cs connState) String() string {
switch cs {
case connStateActive:
return "active"
case connStateIdle:
return "idle"
case connStateClosed:
return "closed"
default:
return "unknown"
}
}
func (s *Server) newConn(conn net.Conn, handshake interface{}) *serverConn {
c := &serverConn{
server: s,
conn: conn,
handshake: handshake,
shutdown: make(chan struct{}),
}
c.setState(connStateIdle)
s.addConnection(c)
return c
}
type serverConn struct {
server *Server
conn net.Conn
handshake interface{} // data from handshake, not used for now
state atomic.Value
shutdownOnce sync.Once
shutdown chan struct{} // forced shutdown, used by close
}
func (c *serverConn) getState() (connState, bool) {
cs, ok := c.state.Load().(connState)
return cs, ok
}
func (c *serverConn) setState(newstate connState) {
c.state.Store(newstate)
}
func (c *serverConn) close() error {
c.shutdownOnce.Do(func() {
close(c.shutdown)
})
return nil
}
func (c *serverConn) run(sctx context.Context) {
type (
request struct {
id uint32
req *Request
}
response struct {
id uint32
resp *Response
}
)
var (
ch = newChannel(c.conn)
ctx, cancel = context.WithCancel(sctx)
active int
state connState = connStateIdle
responses = make(chan response)
requests = make(chan request)
recvErr = make(chan error, 1)
shutdown = c.shutdown
done = make(chan struct{})
)
defer c.conn.Close()
defer cancel()
defer close(done)
go func(recvErr chan error) {
defer close(recvErr)
sendImmediate := func(id uint32, st *status.Status) bool {
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: id,
resp: &Response{
Status: st.Proto(),
},
}:
return true
case <-c.shutdown:
return false
case <-done:
return false
}
}
for {
select {
case <-c.shutdown:
return
case <-done:
return
default: // proceed
}
mh, p, err := ch.recv(ctx)
if err != nil {
status, ok := status.FromError(err)
if !ok {
recvErr <- err
return
}
// in this case, we send an error for that particular message
// when the status is defined.
if !sendImmediate(mh.StreamID, status) {
return
}
continue
}
if mh.Type != messageTypeRequest {
// we must ignore this for future compat.
continue
}
var req Request
if err := c.server.codec.Unmarshal(p, &req); err != nil {
ch.putmbuf(p)
if !sendImmediate(mh.StreamID, status.Newf(codes.InvalidArgument, "unmarshal request error: %v", err)) {
return
}
continue
}
ch.putmbuf(p)
if mh.StreamID%2 != 1 {
// enforce odd client initiated identifiers.
if !sendImmediate(mh.StreamID, status.Newf(codes.InvalidArgument, "StreamID must be odd for client initiated streams")) {
return
}
continue
}
// Forward the request to the main loop. We don't wait on s.done
// because we have already accepted the client request.
select {
case requests <- request{
id: mh.StreamID,
req: &req,
}:
case <-done:
return
}
}
}(recvErr)
for {
newstate := state
switch {
case active > 0:
newstate = connStateActive
shutdown = nil
case active == 0:
newstate = connStateIdle
shutdown = c.shutdown // only enable this branch in idle mode
}
if newstate != state {
c.setState(newstate)
state = newstate
}
select {
case request := <-requests:
active++
go func(id uint32) {
ctx, cancel := getRequestContext(ctx, request.req)
defer cancel()
p, status := c.server.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 := c.server.codec.Marshal(response.resp)
if err != nil {
logrus.WithError(err).Error("failed marshaling response")
return
}
if err := ch.send(ctx, response.id, messageTypeResponse, p); err != nil {
logrus.WithError(err).Error("failed sending message on channel")
return
}
active--
case err := <-recvErr:
// TODO(stevvooe): Not wildly clear what we should do in this
// branch. Basically, it means that we are no longer receiving
// requests due to a terminal error.
recvErr = nil // connection is now "closing"
if err != nil && err != io.EOF {
logrus.WithError(err).Error("error receiving message")
}
case <-shutdown:
return
}
}
}
var noopFunc = func() {}
func getRequestContext(ctx context.Context, req *Request) (retCtx context.Context, cancel func()) {
cancel = noopFunc
if req.TimeoutNano == 0 {
return ctx, cancel
}
ctx, cancel = context.WithTimeout(ctx, time.Duration(req.TimeoutNano))
return ctx, cancel
}

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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
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)
}

43
vendor/github.com/containerd/ttrpc/types.go generated vendored Normal file
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
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"`
TimeoutNano int64 `protobuf:"varint,4,opt,name=timeout_nano,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() {}

108
vendor/github.com/containerd/ttrpc/unixcreds_linux.go generated vendored Normal file
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ttrpc
import (
"context"
"net"
"os"
"syscall"
"github.com/pkg/errors"
"golang.org/x/sys/unix"
)
type UnixCredentialsFunc func(*unix.Ucred) error
func (fn UnixCredentialsFunc) Handshake(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error) {
uc, err := requireUnixSocket(conn)
if err != nil {
return nil, nil, errors.Wrap(err, "ttrpc.UnixCredentialsFunc: require unix socket")
}
rs, err := uc.SyscallConn()
if err != nil {
return nil, nil, errors.Wrap(err, "ttrpc.UnixCredentialsFunc: (net.UnixConn).SyscallConn failed")
}
var (
ucred *unix.Ucred
ucredErr error
)
if err := rs.Control(func(fd uintptr) {
ucred, ucredErr = unix.GetsockoptUcred(int(fd), unix.SOL_SOCKET, unix.SO_PEERCRED)
}); err != nil {
return nil, nil, errors.Wrapf(err, "ttrpc.UnixCredentialsFunc: (*syscall.RawConn).Control failed")
}
if ucredErr != nil {
return nil, nil, errors.Wrapf(err, "ttrpc.UnixCredentialsFunc: failed to retrieve socket peer credentials")
}
if err := fn(ucred); err != nil {
return nil, nil, errors.Wrapf(err, "ttrpc.UnixCredentialsFunc: credential check failed")
}
return uc, ucred, nil
}
// UnixSocketRequireUidGid requires specific *effective* UID/GID, rather than the real UID/GID.
//
// For example, if a daemon binary is owned by the root (UID 0) with SUID bit but running as an
// unprivileged user (UID 1001), the effective UID becomes 0, and the real UID becomes 1001.
// So calling this function with uid=0 allows a connection from effective UID 0 but rejects
// a connection from effective UID 1001.
//
// See socket(7), SO_PEERCRED: "The returned credentials are those that were in effect at the time of the call to connect(2) or socketpair(2)."
func UnixSocketRequireUidGid(uid, gid int) UnixCredentialsFunc {
return func(ucred *unix.Ucred) error {
return requireUidGid(ucred, uid, gid)
}
}
func UnixSocketRequireRoot() UnixCredentialsFunc {
return UnixSocketRequireUidGid(0, 0)
}
// UnixSocketRequireSameUser resolves the current effective unix user and returns a
// UnixCredentialsFunc that will validate incoming unix connections against the
// current credentials.
//
// This is useful when using abstract sockets that are accessible by all users.
func UnixSocketRequireSameUser() UnixCredentialsFunc {
euid, egid := os.Geteuid(), os.Getegid()
return UnixSocketRequireUidGid(euid, egid)
}
func requireRoot(ucred *unix.Ucred) error {
return requireUidGid(ucred, 0, 0)
}
func requireUidGid(ucred *unix.Ucred, uid, gid int) error {
if (uid != -1 && uint32(uid) != ucred.Uid) || (gid != -1 && uint32(gid) != ucred.Gid) {
return errors.Wrap(syscall.EPERM, "ttrpc: invalid credentials")
}
return nil
}
func requireUnixSocket(conn net.Conn) (*net.UnixConn, error) {
uc, ok := conn.(*net.UnixConn)
if !ok {
return nil, errors.New("a unix socket connection is required")
}
return uc, nil
}