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metadata.go
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/
metadata.go
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package gapi
import (
"context"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
)
const (
grpcgatewayUserAgentHeader = "grpcgateway-user-agent"
userAgentHeader = "user-agent"
xForwardedForHeader = "x-forwarded-for"
)
type Metadata struct {
UserAgent string
clientIP string
}
func (server *Server) extracMetadata(ctx context.Context) *Metadata {
mtdt := &Metadata{}
if md, ok := metadata.FromIncomingContext(ctx); ok {
// log.Printf("md: %+v\n", md)
// fot http request
if userAgents := md.Get(grpcgatewayUserAgentHeader); len(userAgents) > 0 {
mtdt.UserAgent = userAgents[0]
}
// fot grpc request
if userAgents := md.Get(userAgentHeader); len(userAgents) > 0 {
mtdt.UserAgent = userAgents[0]
}
// fot http request
if clientIPs := md.Get(xForwardedForHeader); len(clientIPs) > 0 {
mtdt.clientIP = clientIPs[0]
}
}
// fot grpc request
if p, ok := peer.FromContext(ctx); ok {
mtdt.clientIP = p.Addr.String()
}
return mtdt
}