package jsonlog // import "github.com/docker/docker/daemon/logger/jsonfilelog/jsonlog" import ( "bytes" "encoding/json" "time" "unicode/utf8" ) // JSONLogs marshals encoded JSONLog objects type JSONLogs struct { Log []byte `json:"log,omitempty"` Stream string `json:"stream,omitempty"` Created time.Time `json:"time"` // json-encoded bytes RawAttrs json.RawMessage `json:"attrs,omitempty"` } // MarshalJSONBuf is an optimized JSON marshaller that avoids reflection // and unnecessary allocation. func (mj *JSONLogs) MarshalJSONBuf(buf *bytes.Buffer) error { var first = true buf.WriteString(`{`) if len(mj.Log) != 0 { first = false buf.WriteString(`"log":`) ffjsonWriteJSONBytesAsString(buf, mj.Log) } if len(mj.Stream) != 0 { if first { first = false } else { buf.WriteString(`,`) } buf.WriteString(`"stream":`) ffjsonWriteJSONBytesAsString(buf, []byte(mj.Stream)) } if len(mj.RawAttrs) > 0 { if first { first = false } else { buf.WriteString(`,`) } buf.WriteString(`"attrs":`) buf.Write(mj.RawAttrs) } if !first { buf.WriteString(`,`) } created, err := fastTimeMarshalJSON(mj.Created) if err != nil { return err } buf.WriteString(`"time":`) buf.WriteString(created) buf.WriteString(`}`) return nil } func ffjsonWriteJSONBytesAsString(buf *bytes.Buffer, s []byte) { const hex = "0123456789abcdef" buf.WriteByte('"') start := 0 for i := 0; i < len(s); { if b := s[i]; b < utf8.RuneSelf { if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' { i++ continue } if start < i { buf.Write(s[start:i]) } switch b { case '\\', '"': buf.WriteByte('\\') buf.WriteByte(b) case '\n': buf.WriteByte('\\') buf.WriteByte('n') case '\r': buf.WriteByte('\\') buf.WriteByte('r') default: buf.WriteString(`\u00`) buf.WriteByte(hex[b>>4]) buf.WriteByte(hex[b&0xF]) } i++ start = i continue } c, size := utf8.DecodeRune(s[i:]) if c == utf8.RuneError && size == 1 { if start < i { buf.Write(s[start:i]) } buf.WriteString(`\ufffd`) i += size start = i continue } if c == '\u2028' || c == '\u2029' { if start < i { buf.Write(s[start:i]) } buf.WriteString(`\u202`) buf.WriteByte(hex[c&0xF]) i += size start = i continue } i += size } if start < len(s) { buf.Write(s[start:]) } buf.WriteByte('"') }