mirror of https://github.com/docker/cli.git
433 lines
11 KiB
Go
433 lines
11 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package binarylog
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import (
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"net"
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"strings"
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"sync/atomic"
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"time"
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"github.com/golang/protobuf/proto"
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"github.com/golang/protobuf/ptypes"
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pb "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/status"
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)
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type callIDGenerator struct {
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id uint64
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}
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func (g *callIDGenerator) next() uint64 {
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id := atomic.AddUint64(&g.id, 1)
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return id
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}
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// reset is for testing only, and doesn't need to be thread safe.
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func (g *callIDGenerator) reset() {
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g.id = 0
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}
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var idGen callIDGenerator
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// MethodLogger is the sub-logger for each method.
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type MethodLogger interface {
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Log(LogEntryConfig)
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}
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type methodLogger struct {
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headerMaxLen, messageMaxLen uint64
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callID uint64
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idWithinCallGen *callIDGenerator
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sink Sink // TODO(blog): make this plugable.
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}
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func newMethodLogger(h, m uint64) *methodLogger {
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return &methodLogger{
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headerMaxLen: h,
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messageMaxLen: m,
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callID: idGen.next(),
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idWithinCallGen: &callIDGenerator{},
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sink: DefaultSink, // TODO(blog): make it plugable.
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}
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}
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// Build is an internal only method for building the proto message out of the
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// input event. It's made public to enable other library to reuse as much logic
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// in methodLogger as possible.
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func (ml *methodLogger) Build(c LogEntryConfig) *pb.GrpcLogEntry {
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m := c.toProto()
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timestamp, _ := ptypes.TimestampProto(time.Now())
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m.Timestamp = timestamp
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m.CallId = ml.callID
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m.SequenceIdWithinCall = ml.idWithinCallGen.next()
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switch pay := m.Payload.(type) {
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case *pb.GrpcLogEntry_ClientHeader:
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m.PayloadTruncated = ml.truncateMetadata(pay.ClientHeader.GetMetadata())
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case *pb.GrpcLogEntry_ServerHeader:
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m.PayloadTruncated = ml.truncateMetadata(pay.ServerHeader.GetMetadata())
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case *pb.GrpcLogEntry_Message:
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m.PayloadTruncated = ml.truncateMessage(pay.Message)
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}
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return m
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}
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// Log creates a proto binary log entry, and logs it to the sink.
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func (ml *methodLogger) Log(c LogEntryConfig) {
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ml.sink.Write(ml.Build(c))
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}
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func (ml *methodLogger) truncateMetadata(mdPb *pb.Metadata) (truncated bool) {
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if ml.headerMaxLen == maxUInt {
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return false
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}
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var (
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bytesLimit = ml.headerMaxLen
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index int
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)
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// At the end of the loop, index will be the first entry where the total
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// size is greater than the limit:
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//
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// len(entry[:index]) <= ml.hdr && len(entry[:index+1]) > ml.hdr.
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for ; index < len(mdPb.Entry); index++ {
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entry := mdPb.Entry[index]
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if entry.Key == "grpc-trace-bin" {
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// "grpc-trace-bin" is a special key. It's kept in the log entry,
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// but not counted towards the size limit.
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continue
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}
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currentEntryLen := uint64(len(entry.Value))
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if currentEntryLen > bytesLimit {
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break
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}
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bytesLimit -= currentEntryLen
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}
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truncated = index < len(mdPb.Entry)
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mdPb.Entry = mdPb.Entry[:index]
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return truncated
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}
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func (ml *methodLogger) truncateMessage(msgPb *pb.Message) (truncated bool) {
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if ml.messageMaxLen == maxUInt {
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return false
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}
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if ml.messageMaxLen >= uint64(len(msgPb.Data)) {
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return false
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}
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msgPb.Data = msgPb.Data[:ml.messageMaxLen]
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return true
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}
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// LogEntryConfig represents the configuration for binary log entry.
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type LogEntryConfig interface {
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toProto() *pb.GrpcLogEntry
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}
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// ClientHeader configs the binary log entry to be a ClientHeader entry.
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type ClientHeader struct {
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OnClientSide bool
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Header metadata.MD
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MethodName string
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Authority string
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Timeout time.Duration
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// PeerAddr is required only when it's on server side.
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PeerAddr net.Addr
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}
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func (c *ClientHeader) toProto() *pb.GrpcLogEntry {
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// This function doesn't need to set all the fields (e.g. seq ID). The Log
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// function will set the fields when necessary.
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clientHeader := &pb.ClientHeader{
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Metadata: mdToMetadataProto(c.Header),
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MethodName: c.MethodName,
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Authority: c.Authority,
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}
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if c.Timeout > 0 {
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clientHeader.Timeout = ptypes.DurationProto(c.Timeout)
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}
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ret := &pb.GrpcLogEntry{
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Type: pb.GrpcLogEntry_EVENT_TYPE_CLIENT_HEADER,
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Payload: &pb.GrpcLogEntry_ClientHeader{
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ClientHeader: clientHeader,
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},
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}
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if c.OnClientSide {
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ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
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} else {
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ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
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}
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if c.PeerAddr != nil {
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ret.Peer = addrToProto(c.PeerAddr)
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}
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return ret
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}
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// ServerHeader configs the binary log entry to be a ServerHeader entry.
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type ServerHeader struct {
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OnClientSide bool
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Header metadata.MD
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// PeerAddr is required only when it's on client side.
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PeerAddr net.Addr
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}
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func (c *ServerHeader) toProto() *pb.GrpcLogEntry {
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ret := &pb.GrpcLogEntry{
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Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_HEADER,
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Payload: &pb.GrpcLogEntry_ServerHeader{
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ServerHeader: &pb.ServerHeader{
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Metadata: mdToMetadataProto(c.Header),
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},
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},
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}
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if c.OnClientSide {
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ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
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} else {
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ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
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}
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if c.PeerAddr != nil {
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ret.Peer = addrToProto(c.PeerAddr)
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}
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return ret
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}
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// ClientMessage configs the binary log entry to be a ClientMessage entry.
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type ClientMessage struct {
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OnClientSide bool
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// Message can be a proto.Message or []byte. Other messages formats are not
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// supported.
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Message interface{}
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}
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func (c *ClientMessage) toProto() *pb.GrpcLogEntry {
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var (
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data []byte
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err error
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)
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if m, ok := c.Message.(proto.Message); ok {
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data, err = proto.Marshal(m)
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if err != nil {
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grpclogLogger.Infof("binarylogging: failed to marshal proto message: %v", err)
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}
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} else if b, ok := c.Message.([]byte); ok {
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data = b
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} else {
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grpclogLogger.Infof("binarylogging: message to log is neither proto.message nor []byte")
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}
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ret := &pb.GrpcLogEntry{
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Type: pb.GrpcLogEntry_EVENT_TYPE_CLIENT_MESSAGE,
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Payload: &pb.GrpcLogEntry_Message{
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Message: &pb.Message{
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Length: uint32(len(data)),
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Data: data,
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},
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},
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}
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if c.OnClientSide {
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ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
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} else {
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ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
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}
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return ret
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}
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// ServerMessage configs the binary log entry to be a ServerMessage entry.
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type ServerMessage struct {
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OnClientSide bool
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// Message can be a proto.Message or []byte. Other messages formats are not
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// supported.
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Message interface{}
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}
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func (c *ServerMessage) toProto() *pb.GrpcLogEntry {
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var (
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data []byte
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err error
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)
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if m, ok := c.Message.(proto.Message); ok {
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data, err = proto.Marshal(m)
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if err != nil {
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grpclogLogger.Infof("binarylogging: failed to marshal proto message: %v", err)
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}
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} else if b, ok := c.Message.([]byte); ok {
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data = b
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} else {
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grpclogLogger.Infof("binarylogging: message to log is neither proto.message nor []byte")
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}
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ret := &pb.GrpcLogEntry{
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Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_MESSAGE,
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Payload: &pb.GrpcLogEntry_Message{
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Message: &pb.Message{
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Length: uint32(len(data)),
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Data: data,
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},
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},
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}
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if c.OnClientSide {
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ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
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} else {
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ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
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}
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return ret
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}
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// ClientHalfClose configs the binary log entry to be a ClientHalfClose entry.
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type ClientHalfClose struct {
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OnClientSide bool
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}
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func (c *ClientHalfClose) toProto() *pb.GrpcLogEntry {
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ret := &pb.GrpcLogEntry{
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Type: pb.GrpcLogEntry_EVENT_TYPE_CLIENT_HALF_CLOSE,
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Payload: nil, // No payload here.
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}
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if c.OnClientSide {
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ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
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} else {
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ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
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}
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return ret
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}
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// ServerTrailer configs the binary log entry to be a ServerTrailer entry.
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type ServerTrailer struct {
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OnClientSide bool
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Trailer metadata.MD
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// Err is the status error.
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Err error
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// PeerAddr is required only when it's on client side and the RPC is trailer
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// only.
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PeerAddr net.Addr
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}
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func (c *ServerTrailer) toProto() *pb.GrpcLogEntry {
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st, ok := status.FromError(c.Err)
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if !ok {
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grpclogLogger.Info("binarylogging: error in trailer is not a status error")
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}
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var (
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detailsBytes []byte
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err error
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)
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stProto := st.Proto()
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if stProto != nil && len(stProto.Details) != 0 {
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detailsBytes, err = proto.Marshal(stProto)
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if err != nil {
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grpclogLogger.Infof("binarylogging: failed to marshal status proto: %v", err)
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}
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}
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ret := &pb.GrpcLogEntry{
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Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_TRAILER,
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Payload: &pb.GrpcLogEntry_Trailer{
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Trailer: &pb.Trailer{
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Metadata: mdToMetadataProto(c.Trailer),
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StatusCode: uint32(st.Code()),
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StatusMessage: st.Message(),
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StatusDetails: detailsBytes,
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},
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},
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}
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if c.OnClientSide {
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ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
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} else {
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ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
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}
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if c.PeerAddr != nil {
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ret.Peer = addrToProto(c.PeerAddr)
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}
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return ret
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}
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// Cancel configs the binary log entry to be a Cancel entry.
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type Cancel struct {
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OnClientSide bool
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}
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func (c *Cancel) toProto() *pb.GrpcLogEntry {
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ret := &pb.GrpcLogEntry{
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Type: pb.GrpcLogEntry_EVENT_TYPE_CANCEL,
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Payload: nil,
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}
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if c.OnClientSide {
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ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
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} else {
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ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
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}
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return ret
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}
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// metadataKeyOmit returns whether the metadata entry with this key should be
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// omitted.
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func metadataKeyOmit(key string) bool {
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switch key {
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case "lb-token", ":path", ":authority", "content-encoding", "content-type", "user-agent", "te":
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return true
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case "grpc-trace-bin": // grpc-trace-bin is special because it's visiable to users.
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return false
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}
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return strings.HasPrefix(key, "grpc-")
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}
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func mdToMetadataProto(md metadata.MD) *pb.Metadata {
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ret := &pb.Metadata{}
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for k, vv := range md {
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if metadataKeyOmit(k) {
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continue
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}
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for _, v := range vv {
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ret.Entry = append(ret.Entry,
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&pb.MetadataEntry{
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Key: k,
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Value: []byte(v),
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},
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)
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}
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}
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return ret
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}
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func addrToProto(addr net.Addr) *pb.Address {
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ret := &pb.Address{}
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switch a := addr.(type) {
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case *net.TCPAddr:
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if a.IP.To4() != nil {
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ret.Type = pb.Address_TYPE_IPV4
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} else if a.IP.To16() != nil {
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ret.Type = pb.Address_TYPE_IPV6
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} else {
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ret.Type = pb.Address_TYPE_UNKNOWN
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// Do not set address and port fields.
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break
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}
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ret.Address = a.IP.String()
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ret.IpPort = uint32(a.Port)
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case *net.UnixAddr:
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ret.Type = pb.Address_TYPE_UNIX
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ret.Address = a.String()
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default:
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ret.Type = pb.Address_TYPE_UNKNOWN
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}
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return ret
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}
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