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processor.go
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processor.go
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package http2
import (
"bytes"
"compress/gzip"
"context"
"github.com/fullstorydev/grpcurl"
"io"
//"github.com/golang/protobuf/proto"
"github.com/jhump/protoreflect/desc"
"github.com/jhump/protoreflect/grpcreflect"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protodesc"
pref "google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/types/dynamicpb"
"github.com/vearne/grpcreplay/protocol"
slog "github.com/vearne/simplelog"
"google.golang.org/grpc"
reflectpb "google.golang.org/grpc/reflection/grpc_reflection_v1alpha"
"strings"
"sync"
)
type Processor struct {
ConnRepository map[DirectConn]*Http2Conn
InputChan chan *NetPkg
OutputChan chan *protocol.Message
Finder *PBMessageFinder
}
func NewProcessor(input chan *NetPkg, svcAddr string) *Processor {
var p Processor
p.ConnRepository = make(map[DirectConn]*Http2Conn, 100)
p.InputChan = input
p.OutputChan = make(chan *protocol.Message, 100)
p.Finder = NewPBMessageFinder(svcAddr)
slog.Info("create new Processer")
return &p
}
func (p *Processor) ProcessTCPPkg() {
var f *FrameBase
var err error
for pkg := range p.InputChan {
payload := pkg.TCP.Payload
// connection preface
if IsConnPreface(payload) {
continue
}
for len(payload) >= HeaderSize {
f, err = ParseFrameBase(payload)
if err != nil {
slog.Error("ProcessTCPPkg error:%v", err)
continue
}
dc := pkg.DirectConn()
f.DirectConn = &dc
slog.Debug("Connection:%v, seq:%v, FrameType:%v, length:%v, streamID:%v",
f.DirectConn, pkg.TCP.Seq, GetFrameType(f.Type), f.Length, f.StreamID)
var ok bool
if _, ok = p.ConnRepository[dc]; !ok {
p.ConnRepository[dc] = NewHttp2Conn(dc, http2initialHeaderTableSize)
}
// Separate processing according to frame type
p.ProcessFrame(f)
if len(payload) >= int(HeaderSize+f.Length) {
payload = payload[HeaderSize+f.Length:]
} else {
slog.Error("get TCP pkg:%v, seq:%v, tcp flags:%v",
&dc, pkg.TCP.Seq, pkg.TCPFlags())
payload = []byte{}
}
}
}
}
func IsConnPreface(payload []byte) bool {
return len(payload) == ConnectionPrefaceSize &&
(string(payload) == PrefaceEarly || string(payload) == PrefaceSTD)
}
func (p *Processor) ProcessFrame(f *FrameBase) {
switch f.Type {
case FrameTypeData:
// parse data
p.processFrameData(f)
case FrameTypeHeader:
// parse header
p.processFrameHeader(f)
case FrameTypeContinuation:
p.processFrameContinuation(f)
case FrameTypeRSTStream:
// close stream
p.processFrameRSTStream(f)
case FrameTypeGoAway:
// close connection
p.processFrameGoAway(f)
case FrameTypeSetting:
p.processFrameSetting(f)
default:
// ignore the frame
slog.Debug("ignore Frame:%v", GetFrameType(f.Type))
}
}
func (p *Processor) processFrameData(f *FrameBase) {
fd, err := ParseFrameData(f)
if err != nil {
slog.Error("ParseFrameData:%v", err)
return
}
hc := p.ConnRepository[*f.DirectConn]
// 设置stream的状态
index := f.StreamID % StreamArraySize
stream := hc.Streams[index]
var gzipReader *gzip.Reader
// 把protobuf转换为JSON字符串
if len(fd.Data) > 0 && !strings.Contains(stream.Method, "grpc.reflection") {
msg, _ := fd.ParseGRPCMessage()
// 开启压缩了
if msg.PayloadFormat == compressionMade {
// only support gzip
gzipReader, err = gzip.NewReader(bytes.NewReader(msg.EncodedMessage))
if err != nil {
slog.Error("processFrameData, gunzip error:%v", err)
return
}
msg.EncodedMessage, err = io.ReadAll(gzipReader)
if err != nil {
slog.Error("processFrameData, gunzip error:%v", err)
return
}
}
codecType := getCodecType(stream.Headers)
if codecType == CodecProtobuf {
// 注意:暂时只处理 编码方式为Protobuf的情况
pbMsg := p.Finder.FindMethodInput(stream.Method)
err = proto.Unmarshal(msg.EncodedMessage, pbMsg)
if err != nil {
slog.Error("method:%v, proto.Unmarshal:%v", stream.Method, err)
}
stream.Request, err = protojson.Marshal(pbMsg)
if err != nil {
slog.Error("method:%v, json.Marshal:%v", stream.Method, err)
}
} else {
stream.Request = msg.EncodedMessage
}
}
if fd.EndStream {
p.OutputChan <- stream.toMsg()
stream.Reset()
}
}
func getCodecType(headers map[string]string) int {
contentType, ok := headers["content-type"]
if !ok || contentType == "application/grpc" {
return CodecProtobuf
} else {
return CodecOther
}
}
func (p *Processor) processFrameHeader(f *FrameBase) {
fh, err := ParseFrameHeader(f)
if err != nil {
slog.Error("ProcessFrameHeader:%v", err)
return
}
hc := p.ConnRepository[*f.DirectConn]
// 设置stream的状态
index := f.StreamID % StreamArraySize
stream := hc.Streams[index]
stream.StreamID = f.StreamID
stream.EndStream = fh.EndStream
stream.EndHeader = fh.EndHeader
slog.Debug("Connection:%v, stream:%v, EndHeader:%v, EndStream:%v, MaxDynamicTableSize:%v",
hc.DirectConn.String(), stream.StreamID, stream.EndHeader, stream.EndStream, hc.MaxDynamicTableSize)
hdec := hc.HeaderDecoder
hdec.SetMaxStringLength(int(hc.MaxHeaderStringLen))
fields, err := hdec.DecodeFull(fh.HeaderBlockFragment)
if err != nil {
slog.Error(err.Error())
return
}
for _, field := range fields {
stream.Headers[field.Name] = field.Value
if field.Name == PseudoHeaderPath {
stream.Method = field.Value
}
slog.Debug(field.String())
}
if fh.EndStream {
p.OutputChan <- stream.toMsg()
stream.Reset()
}
}
func (p *Processor) processFrameSetting(f *FrameBase) {
fs, err := ParseFrameSetting(f)
if err != nil {
slog.Error("ParseFrameSetting:%v", err)
return
}
if fs.Ack {
return
}
hc := p.ConnRepository[*f.DirectConn]
for _, item := range fs.settings {
if item.ID == http2SettingHeaderTableSize {
slog.Warn("adjust http2SettingHeaderTableSize:%v", item.Val)
hc.MaxDynamicTableSize = item.Val
hc.HeaderDecoder.SetMaxDynamicTableSize(item.Val)
}
}
}
func (p *Processor) processFrameContinuation(f *FrameBase) {
fc, err := ParseFrameContinuation(f)
if err != nil {
slog.Error("ParseFrameContinuation:%v", err)
return
}
hc, ok := p.ConnRepository[*f.DirectConn]
if !ok {
slog.Error("connection[%v] doesn't exist", f.DirectConn.String())
return
}
// 设置stream的状态
index := fc.fb.StreamID % StreamArraySize
stream := hc.Streams[index]
stream.StreamID = f.StreamID
stream.EndHeader = fc.EndHeader
slog.Debug("Connection:%v, stream:%v, EndHeader:%v, EndStream:%v",
hc.DirectConn.String(), stream.StreamID, stream.EndHeader, stream.EndStream)
hdec := hc.HeaderDecoder
hdec.SetMaxStringLength(int(hc.MaxHeaderStringLen))
fields, err := hdec.DecodeFull(fc.HeaderBlockFragment)
if err != nil {
slog.Error(err.Error())
return
}
for _, field := range fields {
stream.Headers[field.Name] = field.Value
slog.Debug(field.String())
}
}
func (p *Processor) processFrameGoAway(f *FrameBase) {
_, ok := p.ConnRepository[*f.DirectConn]
if !ok {
slog.Error("connection[%v] doesn't exist", f.DirectConn.String())
return
}
// remove http2Conn
delete(p.ConnRepository, *f.DirectConn)
}
func (p *Processor) processFrameRSTStream(f *FrameBase) {
hc, ok := p.ConnRepository[*f.DirectConn]
if !ok {
slog.Error("connection[%v] doesn't exist", f.DirectConn.String())
return
}
// 设置stream的状态
index := f.StreamID % StreamArraySize
stream := hc.Streams[index]
stream.Reset()
}
type PBMessageFinder struct {
cacheMu sync.RWMutex
symbolMsg map[string]proto.Message
// server address
addr string
}
func NewPBMessageFinder(addr string) *PBMessageFinder {
var f PBMessageFinder
// svcAndMethod -> proto.Message
f.symbolMsg = make(map[string]proto.Message)
f.addr = addr
return &f
}
func (f *PBMessageFinder) FindMethodInput(svcAndMethod string) proto.Message {
f.cacheMu.RLock()
m, ok := f.symbolMsg[svcAndMethod]
f.cacheMu.RUnlock()
if ok {
return m
}
// can't find in cache
var cc *grpc.ClientConn
network := "tcp"
ctx := context.Background()
cc, err := grpcurl.BlockingDial(ctx, network, f.addr, nil)
if err != nil {
slog.Fatal("PBMessageFinder.FindMethodInput, addr:%v, error:%v,enable grpc reflection service?",
f.addr, err)
}
refClient := grpcreflect.NewClientV1Alpha(ctx, reflectpb.NewServerReflectionClient(cc))
descSource := grpcurl.DescriptorSourceFromServer(ctx, refClient)
svc, method := parseSymbol(svcAndMethod)
dsc, err := descSource.FindSymbol(svc)
if err != nil {
slog.Fatal("descSource.FindSymbol, service:%v, error:%v", svc, err)
}
sd, ok := dsc.(*desc.ServiceDescriptor)
if !ok {
slog.Fatal("FindMethodInput, error:%v", err)
}
mtd := sd.FindMethodByName(method)
inputType := mtd.GetInputType()
fd := inputType.GetFile().AsFileDescriptorProto()
// get FileDescriptor
pf, err := protodesc.NewFile(fd, nil)
if err != nil {
slog.Fatal("protodesc.NewFile, svcAndMethod:%v", svcAndMethod)
}
reqMsgDescriptor := pf.Messages().ByName(pref.Name(inputType.GetName()))
msg := dynamicpb.NewMessage(reqMsgDescriptor)
f.cacheMu.Lock()
f.symbolMsg[svcAndMethod] = msg
f.cacheMu.Unlock()
return msg
}
func parseSymbol(svcAndMethod string) (string, string) {
if svcAndMethod[0] == '/' {
svcAndMethod = svcAndMethod[1:]
}
pos := strings.LastIndex(svcAndMethod, "/")
if pos < 0 {
pos = strings.LastIndex(svcAndMethod, ".")
if pos < 0 {
return "", ""
}
}
return svcAndMethod[:pos], svcAndMethod[pos+1:]
}