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encoder.go
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encoder.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2022 Datadog, Inc.
package pproflite
import (
"fmt"
"io"
"github.com/richardartoul/molecule"
)
type encoder interface {
Field
encode(*molecule.ProtoStream) error
}
type primtiveEncoder interface {
Field
encodePrimitive(*molecule.ProtoStream) error
}
// NewEncoder ...
func NewEncoder(w io.Writer) *Encoder {
e := &Encoder{}
e.Reset(w)
return e
}
// Encoder ...
type Encoder struct {
outWriter io.Writer
outStream *molecule.ProtoStream
}
// Reset ...
func (e *Encoder) Reset(w io.Writer) {
e.outWriter = w
if e.outStream == nil {
e.outStream = molecule.NewProtoStream(w)
} else {
e.outStream.Reset(w)
}
}
// Encode ...
func (e *Encoder) Encode(f Field) error {
switch t := f.(type) {
case encoder:
return e.outStream.Embedded(f.field(), t.encode)
case primtiveEncoder:
return t.encodePrimitive(e.outStream)
default:
return fmt.Errorf("field %T does not support encoder interface", f)
}
}
func encodeFields(ps *molecule.ProtoStream, fields []interface{}) error {
for i, f := range fields {
if f == nil {
continue
}
var err error
switch t := f.(type) {
case *bool:
err = ps.Bool(i, *t)
case *int64:
err = ps.Int64(i, *t)
case *uint64:
err = ps.Uint64(i, *t)
case *[]uint64:
err = encodePackedUint64(ps, i, *t)
case *[]int64:
err = encodePackedInt64(ps, i, *t)
case *[]Label:
for j := range *t {
if err = ps.Embedded(i, (*t)[j].encode); err != nil {
break
}
}
case *[]Line:
for j := range *t {
if err = ps.Embedded(i, (*t)[j].encode); err != nil {
break
}
}
default:
err = fmt.Errorf("encodeFields: unknown type: %T", t)
}
if err != nil {
return err
}
}
return nil
}
func encodePackedInt64(ps *molecule.ProtoStream, field int, vals []int64) error {
if len(vals) == 1 {
return ps.Int64(field, vals[0])
}
return ps.Int64Packed(field, vals)
}
func encodePackedUint64(ps *molecule.ProtoStream, field int, vals []uint64) error {
if len(vals) == 1 {
return ps.Uint64(field, vals[0])
}
return ps.Uint64Packed(field, vals)
}