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json.go
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/
json.go
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package client
import (
"strconv"
"time"
"unsafe"
json "github.com/json-iterator/go"
"github.com/modern-go/reflect2"
"github.com/pachyderm/pachyderm/v2/src/internal/errors"
)
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/entry.go
func init() {
json.RegisterExtension(&jsonExtension{})
}
// ResultType holds the type of the result
type ResultType string
// ResultValue interface mimics the promql.Value interface
// From: https://github.com/grafana/loki/blob/a9d85de4aa5290cf2f8b2dca5d08645bbd0dc66c/pkg/loghttp/query.go
type ResultValue interface {
Type() ResultType
}
// ResultType values
const (
ResultTypeStream = "streams"
)
// Type implements the promql.Value interface
// From: https://github.com/grafana/loki/blob/a9d85de4aa5290cf2f8b2dca5d08645bbd0dc66c/pkg/loghttp/query.go
func (Streams) Type() ResultType { return ResultTypeStream }
// Streams is a slice of Stream
// From: https://github.com/grafana/loki/blob/a9d85de4aa5290cf2f8b2dca5d08645bbd0dc66c/pkg/loghttp/query.go
type Streams []Stream
// Stream represents a log stream. It includes a set of log entries and their labels.
// From: https://github.com/grafana/loki/blob/a9d85de4aa5290cf2f8b2dca5d08645bbd0dc66c/pkg/loghttp/query.go
type Stream struct {
Labels LabelSet `json:"stream"`
Entries []Entry `json:"values"`
}
// LabelSet is a key/value pair mapping of labels
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/labels.go
type LabelSet map[string]string
// Entry represents a log entry. It includes a log message and the time it occurred at.
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/entry.go
type Entry struct {
Timestamp time.Time
Line string
}
// QueryResponseData represents the http json response to a label query
// From: https://github.com/grafana/loki/blob/a9d85de4aa5290cf2f8b2dca5d08645bbd0dc66c/pkg/loghttp/query.go
type QueryResponseData struct {
ResultType ResultType `json:"resultType"`
Result ResultValue `json:"result"`
//Statistics interface{} `json:"stats"`
}
// QueryResponse represents the http json response to a Loki range and instant query
// From: https://github.com/grafana/loki/blob/a9d85de4aa5290cf2f8b2dca5d08645bbd0dc66c/pkg/loghttp/query.go
type QueryResponse struct {
Status string `json:"status"`
Data QueryResponseData `json:"data"`
}
// UnmarshalJSON implements the json.Unmarshaler interface.
// From: https://github.com/grafana/loki/blob/a9d85de4aa5290cf2f8b2dca5d08645bbd0dc66c/pkg/loghttp/query.go
func (q *QueryResponseData) UnmarshalJSON(data []byte) error {
unmarshal := struct {
Type ResultType `json:"resultType"`
Result json.RawMessage `json:"result"`
//Statistics stats.Result `json:"stats"`
}{}
err := json.Unmarshal(data, &unmarshal)
if err != nil {
return errors.EnsureStack(err)
}
var value ResultValue
// unmarshal results
switch unmarshal.Type {
case ResultTypeStream:
var s Streams
err = json.Unmarshal(unmarshal.Result, &s)
value = s
/*case ResultTypeMatrix:
var m Matrix
err = json.Unmarshal(unmarshal.Result, &m)
value = m
case ResultTypeVector:
var v Vector
err = json.Unmarshal(unmarshal.Result, &v)
value = v
case ResultTypeScalar:
var v Scalar
err = json.Unmarshal(unmarshal.Result, &v)
value = v*/
default:
return errors.Errorf("unknown type: %s", unmarshal.Type)
}
if err != nil {
return errors.EnsureStack(err)
}
q.ResultType = unmarshal.Type
q.Result = value
//q.Statistics = unmarshal.Statistics
return nil
}
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/entry.go
type jsonExtension struct {
json.DummyExtension
}
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/entry.go
type sliceEntryDecoder struct{}
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/entry.go
func (sliceEntryDecoder) Decode(ptr unsafe.Pointer, iter *json.Iterator) {
*((*[]Entry)(ptr)) = (*((*[]Entry)(ptr)))[:0]
iter.ReadArrayCB(func(iter *json.Iterator) bool {
i := 0
var ts time.Time
var line string
ok := iter.ReadArrayCB(func(iter *json.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
})
}
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/entry.go
func readTimestamp(iter *json.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
}*/
// From: https://github.com/grafana/loki/blob/d9380eaac950c669864c0af60fd99eae281d2438/pkg/loghttp/entry.go
func (e *jsonExtension) CreateDecoder(typ reflect2.Type) json.ValDecoder {
if typ == reflect2.TypeOf([]Entry{}) {
return sliceEntryDecoder{}
}
return nil
}