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| // Copyright 2024 The original author or authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| package gslog | ||
|
|
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| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "log/slog" | ||
|
Check failure on line 20 in attr.go
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| "sync" | ||
| "time" | ||
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| structpb "github.com/golang/protobuf/ptypes/struct" | ||
| spb "google.golang.org/protobuf/types/known/structpb" | ||
| ) | ||
|
|
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| var ( | ||
| noopAttrMapper AttrMapper = func(_ []string, a slog.Attr) slog.Attr { | ||
| return a | ||
| } | ||
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| timePool = sync.Pool{ | ||
| New: func() any { | ||
| b := make([]byte, 0, len(time.RFC3339Nano)) | ||
| return &b | ||
| }, | ||
| } | ||
| ) | ||
|
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| // AttrMapper is called to rewrite each non-group attribute before it is logged. | ||
| // The attribute's value has been resolved (see [Value.Resolve]). | ||
| // If replaceAttr returns a zero Attr, the attribute is discarded. | ||
| // | ||
| // The built-in attributes with keys "time", "level", "source", and "msg" | ||
| // are passed to this function, except that time is omitted | ||
| // if zero, and source is omitted if addSource is false. | ||
| // | ||
| // The first argument is a list of currently open groups that contain the | ||
| // Attr. It must not be retained or modified. replaceAttr is never called | ||
| // for Group attributes, only their contents. For example, the attribute | ||
| // list | ||
| // | ||
| // Int("a", 1), Group("g", Int("b", 2)), Int("c", 3) | ||
| // | ||
| // results in consecutive calls to replaceAttr with the following arguments: | ||
| // | ||
| // nil, Int("a", 1) | ||
| // []string{"g"}, Int("b", 2) | ||
| // nil, Int("c", 3) | ||
| // | ||
| // AttrMapper can be used to change the default keys of the built-in | ||
| // attributes, convert types (for example, to replace a `time.Time` with the | ||
| // integer seconds since the Unix epoch), sanitize personal information, or | ||
| // remove attributes from the output. | ||
| type AttrMapper func(groups []string, a slog.Attr) slog.Attr | ||
|
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| func decorateWith(p *structpb.Struct, a slog.Attr) { | ||
| a.Value.Resolve() | ||
| val, ok := valToStruct(a.Value) | ||
| if !ok { | ||
| return | ||
| } | ||
| p.Fields[a.Key] = val | ||
| } | ||
|
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| func valToStruct(v slog.Value) (val *structpb.Value, ok bool) { | ||
| switch v.Kind() { | ||
| case slog.KindString: | ||
| return &structpb.Value{Kind: &structpb.Value_StringValue{StringValue: v.String()}}, true | ||
| case slog.KindInt64: | ||
| return &structpb.Value{Kind: &structpb.Value_NumberValue{NumberValue: float64(v.Int64())}}, true | ||
| case slog.KindUint64: | ||
| return &structpb.Value{Kind: &structpb.Value_NumberValue{NumberValue: float64(v.Uint64())}}, true | ||
| case slog.KindFloat64: | ||
| return &structpb.Value{Kind: &structpb.Value_NumberValue{NumberValue: v.Float64()}}, true | ||
| case slog.KindBool: | ||
| return &structpb.Value{Kind: &structpb.Value_BoolValue{BoolValue: v.Bool()}}, true | ||
| case slog.KindDuration: | ||
| return &structpb.Value{Kind: &structpb.Value_NumberValue{NumberValue: float64(v.Duration())}}, true | ||
| case slog.KindTime: | ||
| ptr := timePool.Get().(*[]byte) | ||
| buf := *ptr | ||
| buf = buf[0:0] | ||
| defer func() { | ||
| *ptr = buf | ||
| timePool.Put(ptr) | ||
| }() | ||
| buf = append(buf, byte('"')) | ||
| buf = v.Time().AppendFormat(buf, time.RFC3339Nano) | ||
| buf = append(buf, byte('"')) | ||
| return &structpb.Value{Kind: &structpb.Value_StringValue{StringValue: string(buf)}}, true | ||
| case slog.KindGroup: | ||
| p2 := &structpb.Struct{Fields: make(map[string]*spb.Value)} | ||
| for _, b := range v.Group() { | ||
| decorateWith(p2, b) | ||
| } | ||
| return &structpb.Value{Kind: &structpb.Value_StructValue{StructValue: p2}}, true | ||
| case slog.KindAny: | ||
| a := v.Any() | ||
|
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| // if value is an error, but not a JSON marshaller, return error | ||
| _, jm := a.(json.Marshaler) | ||
| if err, ok := a.(error); ok && !jm { | ||
| return &structpb.Value{Kind: &structpb.Value_StringValue{StringValue: err.Error()}}, true | ||
| } | ||
|
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| // value may be simply mappable to a structpb.Value. | ||
| if nv, err := spb.NewValue(a); err == nil { | ||
| return nv, true | ||
| } | ||
|
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| // try converting to a JSON object | ||
| return asJson(a) | ||
| default: | ||
| return nil, false | ||
| } | ||
| } | ||
|
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| func fromPath(p *structpb.Struct, path []string) *structpb.Struct { | ||
| for _, k := range path { | ||
| p = p.Fields[k].GetStructValue() | ||
| } | ||
| if p.Fields == nil { | ||
| p.Fields = make(map[string]*structpb.Value) | ||
| } | ||
| return p | ||
| } | ||
|
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| func asJson(a any) (*structpb.Value, bool) { | ||
| a, err := toJson(a) | ||
| if err != nil { | ||
| return nil, false | ||
| } | ||
|
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| if nv, err := spb.NewValue(a); err == nil { | ||
| return nv, true | ||
| } | ||
|
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| return nil, false | ||
| } | ||
|
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| func toJson(a any) (any, error) { | ||
| var buf bytes.Buffer | ||
| enc := json.NewEncoder(&buf) | ||
| if err := enc.Encode(a); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| var result any | ||
| if err := json.Unmarshal(buf.Bytes(), &result); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return result, nil | ||
| } | ||
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