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@amsokol
Created September 16, 2018 06:45
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package middleware
import (
"github.com/grpc-ecosystem/go-grpc-middleware"
"github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
"github.com/grpc-ecosystem/go-grpc-middleware/tags"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
// codeToLevel redirects OK to DEBUG level logging instead of INFO
// This is example how you can log several gRPC code results
func codeToLevel(code codes.Code) zapcore.Level {
if code == codes.OK {
// It is DEBUG
return zap.DebugLevel
}
return grpc_zap.DefaultCodeToLevel(code)
}
// AddLogging returns grpc.Server config option that turn on logging.
func AddLogging(logger *zap.Logger, opts []grpc.ServerOption) []grpc.ServerOption {
// Shared options for the logger, with a custom gRPC code to log level function.
o := []grpc_zap.Option{
grpc_zap.WithLevels(codeToLevel),
}
// Make sure that log statements internal to gRPC library are logged using the zapLogger as well.
grpc_zap.ReplaceGrpcLogger(logger)
// Add unary interceptor
opts = append(opts, grpc_middleware.WithUnaryServerChain(
grpc_ctxtags.UnaryServerInterceptor(grpc_ctxtags.WithFieldExtractor(grpc_ctxtags.CodeGenRequestFieldExtractor)),
grpc_zap.UnaryServerInterceptor(logger, o...),
))
// Add stream interceptor (added as an example here)
opts = append(opts, grpc_middleware.WithStreamServerChain(
grpc_ctxtags.StreamServerInterceptor(grpc_ctxtags.WithFieldExtractor(grpc_ctxtags.CodeGenRequestFieldExtractor)),
grpc_zap.StreamServerInterceptor(logger, o...),
))
return opts
}
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