83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
/*
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*
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* Copyright 2021 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package pretty defines helper functions to pretty-print structs for logging.
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package pretty
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"github.com/golang/protobuf/jsonpb"
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protov1 "github.com/golang/protobuf/proto"
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"google.golang.org/protobuf/encoding/protojson"
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protov2 "google.golang.org/protobuf/proto"
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)
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const jsonIndent = " "
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// ToJSON marshals the input into a json string.
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//
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// If marshal fails, it falls back to fmt.Sprintf("%+v").
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func ToJSON(e interface{}) string {
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switch ee := e.(type) {
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case protov1.Message:
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mm := jsonpb.Marshaler{Indent: jsonIndent}
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ret, err := mm.MarshalToString(ee)
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if err != nil {
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// This may fail for proto.Anys, e.g. for xDS v2, LDS, the v2
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// messages are not imported, and this will fail because the message
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// is not found.
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return fmt.Sprintf("%+v", ee)
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}
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return ret
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case protov2.Message:
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mm := protojson.MarshalOptions{
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Multiline: true,
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Indent: jsonIndent,
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}
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ret, err := mm.Marshal(ee)
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if err != nil {
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// This may fail for proto.Anys, e.g. for xDS v2, LDS, the v2
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// messages are not imported, and this will fail because the message
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// is not found.
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return fmt.Sprintf("%+v", ee)
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}
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return string(ret)
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default:
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ret, err := json.MarshalIndent(ee, "", jsonIndent)
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if err != nil {
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return fmt.Sprintf("%+v", ee)
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}
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return string(ret)
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}
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}
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// FormatJSON formats the input json bytes with indentation.
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//
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// If Indent fails, it returns the unchanged input as string.
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func FormatJSON(b []byte) string {
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var out bytes.Buffer
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err := json.Indent(&out, b, "", jsonIndent)
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if err != nil {
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return string(b)
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}
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return out.String()
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}
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