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entry.go
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entry.go
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package loghttp
import (
"strconv"
"time"
"unsafe"
"github.com/buger/jsonparser"
jsoniter "github.com/json-iterator/go"
"github.com/modern-go/reflect2"
)
func init() {
jsoniter.RegisterExtension(&jsonExtension{})
}
// Entry represents a log entry. It includes a log message and the time it occurred at.
type Entry struct {
Timestamp time.Time
Line string
}
func (e *Entry) UnmarshalJSON(data []byte) error {
var (
i int
parseError error
)
_, err := jsonparser.ArrayEach(data, func(value []byte, _ jsonparser.ValueType, _ int, _ error) {
switch i {
case 0: // timestamp
ts, err := jsonparser.ParseInt(value)
if err != nil {
parseError = err
return
}
e.Timestamp = time.Unix(0, ts)
case 1: // value
v, err := jsonparser.ParseString(value)
if err != nil {
parseError = err
return
}
e.Line = v
}
i++
})
if parseError != nil {
return parseError
}
return err
}
type jsonExtension struct {
jsoniter.DummyExtension
}
type sliceEntryDecoder struct{}
func (sliceEntryDecoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
*((*[]Entry)(ptr)) = (*((*[]Entry)(ptr)))[:0]
iter.ReadArrayCB(func(iter *jsoniter.Iterator) bool {
i := 0
var ts time.Time
var line string
ok := iter.ReadArrayCB(func(iter *jsoniter.Iterator) bool {
var ok bool
switch i {
case 0:
ts, ok = readTimestamp(iter)
i++
return ok
case 1:
line = iter.ReadString()
i++
if iter.Error != nil {
return false
}
return true
default:
iter.ReportError("error reading entry", "array must contains 2 values")
return false
}
})
if ok {
*((*[]Entry)(ptr)) = append(*((*[]Entry)(ptr)), Entry{
Timestamp: ts,
Line: line,
})
return true
}
return false
})
}
func readTimestamp(iter *jsoniter.Iterator) (time.Time, bool) {
s := iter.ReadString()
if iter.Error != nil {
return time.Time{}, false
}
t, err := strconv.ParseInt(s, 10, 64)
if err != nil {
iter.ReportError("error reading entry timestamp", err.Error())
return time.Time{}, false
}
return time.Unix(0, t), true
}
type entryEncoder struct{}
func (entryEncoder) IsEmpty(ptr unsafe.Pointer) bool {
// we don't omit-empty with log entries.
return false
}
func (entryEncoder) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
e := *((*Entry)(ptr))
stream.WriteArrayStart()
stream.WriteRaw(`"`)
stream.WriteRaw(strconv.FormatInt(e.Timestamp.UnixNano(), 10))
stream.WriteRaw(`"`)
stream.WriteMore()
stream.WriteStringWithHTMLEscaped(e.Line)
stream.WriteArrayEnd()
}
func (e *jsonExtension) CreateDecoder(typ reflect2.Type) jsoniter.ValDecoder {
if typ == reflect2.TypeOf([]Entry{}) {
return sliceEntryDecoder{}
}
return nil
}
func (e *jsonExtension) CreateEncoder(typ reflect2.Type) jsoniter.ValEncoder {
if typ == reflect2.TypeOf(Entry{}) {
return entryEncoder{}
}
return nil
}