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|
package metrics
import (
"context"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// UnaryServerInterceptor creates a gRPC unary interceptor for metrics collection.
// It should be the first interceptor in the chain to measure total request time.
func UnaryServerInterceptor(m *Metrics) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
start := time.Now()
// Call the handler
resp, err := handler(ctx, req)
// Record metrics
duration := time.Since(start).Seconds()
requestStatus := getRequestStatus(err)
m.RecordRequest(info.FullMethod, string(requestStatus), duration)
return resp, err
}
}
// StreamServerInterceptor creates a gRPC stream interceptor for metrics collection.
func StreamServerInterceptor(m *Metrics) grpc.StreamServerInterceptor {
return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
start := time.Now()
// Increment subscriptions count
m.IncrementSubscriptions()
defer m.DecrementSubscriptions()
// Call the handler
err := handler(srv, ss)
// Record metrics
duration := time.Since(start).Seconds()
requestStatus := getRequestStatus(err)
m.RecordRequest(info.FullMethod, string(requestStatus), duration)
return err
}
}
// getRequestStatus determines the request status from an error.
func getRequestStatus(err error) RequestStatus {
if err == nil {
return StatusOK
}
st, ok := status.FromError(err)
if !ok {
return StatusError
}
switch st.Code() {
case codes.OK:
return StatusOK
case codes.Unauthenticated:
return StatusUnauthenticated
case codes.ResourceExhausted:
return StatusRateLimited
case codes.InvalidArgument:
return StatusInvalidRequest
default:
return StatusError
}
}
|
