/
grpcutil.go
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/
grpcutil.go
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package grpcutil
import (
"context"
"fmt"
"path"
"strings"
"sync/atomic"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/status"
)
func UnaryServerTimeHandler(cb func(payload, peer string, t time.Duration)) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
t0 := time.Now()
defer func() {
t := time.Since(t0)
var payload string
if reqStringer, ok := req.(fmt.Stringer); ok {
payload = reqStringer.String()
}
var reqPeer string
if p, ok := peer.FromContext(ctx); ok {
reqPeer = p.Addr.String()
}
cb(payload, reqPeer, t)
}()
return handler(ctx, req)
}
}
func StreamServerTimeHandler(cb func(payload, peer string, t time.Duration)) grpc.StreamServerInterceptor {
return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
t0 := time.Now()
wss := GetWrappedStream(ss)
defer func() {
t := time.Since(t0)
var reqPeer string
if p, ok := peer.FromContext(wss.Context()); ok {
reqPeer = p.Addr.String()
}
cb(wss.Payload(), reqPeer, t)
}()
return handler(srv, wss)
}
}
func GetWrappedStream(ss grpc.ServerStream) *WrappedStream {
if wss, ok := ss.(*WrappedStream); ok {
return wss
}
return &WrappedStream{
ServerStream: ss,
ctx: ss.Context(),
}
}
type WrappedStream struct {
grpc.ServerStream
ctx context.Context
payload string
gotFirst bool
}
func (ws *WrappedStream) RecvMsg(m interface{}) error {
err := ws.ServerStream.RecvMsg(m)
if err != nil {
return err
}
if ws.gotFirst {
return nil
}
if p, ok := m.(fmt.Stringer); ok {
ws.payload = p.String()
}
ws.gotFirst = true
return nil
}
func (ws *WrappedStream) Context() context.Context {
return ws.ctx
}
func (ws *WrappedStream) SetContext(ctx context.Context) {
ws.ctx = ctx
}
func (ws *WrappedStream) Payload() string {
return ws.payload
}
func UnaryServerStatusMetricHandler(statusCodes map[string][]uint64, promRequest func(string, int)) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
res, err := handler(ctx, req)
grpcServerStatusMetricHandler(info.FullMethod, err, statusCodes, promRequest)
return res, err
}
}
func StreamServerStatusMetricHandler(statusCodes map[string][]uint64, promRequest func(string, int)) grpc.StreamServerInterceptor {
return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
err := handler(srv, ss)
grpcServerStatusMetricHandler(info.FullMethod, err, statusCodes, promRequest)
return err
}
}
func grpcServerStatusMetricHandler(fullMethodName string, handlerErr error, statusCodes map[string][]uint64, promRequest func(string, int)) {
_, methodName := path.Split(fullMethodName)
endpoint := strings.ToLower(methodName)
var major int
if handlerErr != nil {
s, _ := status.FromError(handlerErr)
major = getHTTPStatusCodeMajorFromGrpcStatusCode(s.Code())
} else {
major = getHTTPStatusCodeMajorFromGrpcStatusCode(codes.OK)
}
if globalStatusCodes := statusCodes["combined"]; major < len(globalStatusCodes) {
atomic.AddUint64(&globalStatusCodes[major], 1)
if handlerStatusCodes, ok := statusCodes[endpoint]; ok {
atomic.AddUint64(&handlerStatusCodes[major], 1)
}
}
promRequest(endpoint, major)
}
func getHTTPStatusCodeMajorFromGrpcStatusCode(code codes.Code) int {
switch code {
case codes.OK:
return 1
case codes.Canceled,
codes.InvalidArgument,
codes.NotFound,
codes.AlreadyExists,
codes.PermissionDenied,
codes.ResourceExhausted,
codes.FailedPrecondition,
codes.Unauthenticated:
return 3
default:
return 4
}
}