Copyright 2017, OpenCensus 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.

package tag

import (
	
	
)
KeyType defines the types of keys allowed. Currently only keyTypeString is supported.
type keyType byte

const (
	keyTypeString keyType = iota
	keyTypeInt64
	keyTypeTrue
	keyTypeFalse

	tagsVersionID = byte(0)
)

type encoderGRPC struct {
	buf               []byte
	writeIdx, readIdx int
}
writeKeyString writes the fieldID '0' followed by the key string and value string.
func ( *encoderGRPC) (,  string) {
	.writeByte(byte(keyTypeString))
	.writeStringWithVarintLen()
	.writeStringWithVarintLen()
}

func ( *encoderGRPC) ( string,  uint64) {
	.writeByte(byte(keyTypeInt64))
	.writeStringWithVarintLen()
	.writeUint64()
}

func ( *encoderGRPC) ( string) {
	.writeByte(byte(keyTypeTrue))
	.writeStringWithVarintLen()
}

func ( *encoderGRPC) ( string) {
	.writeByte(byte(keyTypeFalse))
	.writeStringWithVarintLen()
}

func ( *encoderGRPC) ( []byte) {
	 := len()

	.growIfRequired(binary.MaxVarintLen64 + )
	.writeIdx += binary.PutUvarint(.buf[.writeIdx:], uint64())
	copy(.buf[.writeIdx:], )
	.writeIdx += 
}

func ( *encoderGRPC) ( string) {
	 := len()

	.growIfRequired(binary.MaxVarintLen64 + )
	.writeIdx += binary.PutUvarint(.buf[.writeIdx:], uint64())
	copy(.buf[.writeIdx:], )
	.writeIdx += 
}

func ( *encoderGRPC) ( byte) {
	.growIfRequired(1)
	.buf[.writeIdx] = 
	.writeIdx++
}

func ( *encoderGRPC) ( uint32) {
	.growIfRequired(4)
	binary.LittleEndian.PutUint32(.buf[.writeIdx:], )
	.writeIdx += 4
}

func ( *encoderGRPC) ( uint64) {
	.growIfRequired(8)
	binary.LittleEndian.PutUint64(.buf[.writeIdx:], )
	.writeIdx += 8
}

func ( *encoderGRPC) () byte {
	 := .buf[.readIdx]
	.readIdx++
	return 
}

func ( *encoderGRPC) () uint32 {
	 := binary.LittleEndian.Uint32(.buf[.readIdx:])
	.readIdx += 4
	return 
}

func ( *encoderGRPC) () uint64 {
	 := binary.LittleEndian.Uint64(.buf[.readIdx:])
	.readIdx += 8
	return 
}

func ( *encoderGRPC) () ([]byte, error) {
	if .readEnded() {
		return nil, fmt.Errorf("unexpected end while readBytesWithVarintLen '%x' starting at idx '%v'", .buf, .readIdx)
	}
	,  := binary.Uvarint(.buf[.readIdx:])
	if  <= 0 {
		return nil, fmt.Errorf("unexpected end while readBytesWithVarintLen '%x' starting at idx '%v'", .buf, .readIdx)
	}

	 += .readIdx
	 :=  + int()
	if  > len(.buf) {
		return nil, fmt.Errorf("malformed encoding: length:%v, upper:%v, maxLength:%v", , , len(.buf))
	}

	.readIdx = 
	return .buf[:], nil
}

func ( *encoderGRPC) () (string, error) {
	,  := .readBytesWithVarintLen()
	if  != nil {
		return "", 
	}
	return string(), nil
}

func ( *encoderGRPC) ( int) {
	if len(.buf)-.writeIdx <  {
		 := make([]byte, 2*(len(.buf)+1)+)
		copy(, .buf)
		.buf = 
	}
}

func ( *encoderGRPC) () bool {
	return .readIdx >= len(.buf)
}

func ( *encoderGRPC) () []byte {
	return .buf[:.writeIdx]
}
Encode encodes the tag map into a []byte. It is useful to propagate the tag maps on wire in binary format.
func ( *Map) []byte {
	if  == nil {
		return nil
	}
	 := &encoderGRPC{
		buf: make([]byte, len(.m)),
	}
	.writeByte(tagsVersionID)
	for ,  := range .m {
		if .m.ttl.ttl == valueTTLUnlimitedPropagation {
			.writeByte(byte(keyTypeString))
			.writeStringWithVarintLen(.name)
			.writeBytesWithVarintLen([]byte(.value))
		}
	}
	return .bytes()
}
Decode decodes the given []byte into a tag map.
func ( []byte) (*Map, error) {
	 := newMap()
	 := DecodeEach(, .upsert)
no partial failures
		return nil, 
	}
	return , nil
}
DecodeEach decodes the given serialized tag map, calling handler for each tag key and value decoded.
func ( []byte,  func( Key,  string,  metadatas)) error {
	 := &encoderGRPC{
		buf: ,
	}
	if len(.buf) == 0 {
		return nil
	}

	 := .readByte()
	if  > tagsVersionID {
		return fmt.Errorf("cannot decode: unsupported version: %q; supports only up to: %q", , tagsVersionID)
	}

	for !.readEnded() {
		 := keyType(.readByte())

		if  != keyTypeString {
			return fmt.Errorf("cannot decode: invalid key type: %q", )
		}

		,  := .readBytesWithVarintLen()
		if  != nil {
			return 
		}

		,  := .readBytesWithVarintLen()
		if  != nil {
			return 
		}

		,  := NewKey(string())
		if  != nil {
			return 
		}
		 := string()
		if !checkValue() {
			return errInvalidValue
		}
		(, , createMetadatas(WithTTL(TTLUnlimitedPropagation)))
		if  != nil {
			return 
		}
	}
	return nil