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amqpreader.go
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amqpreader.go
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package amqp
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"io"
)
func ReadFrame(reader io.Reader) (*WireFrame, error) {
// Using little since other functions will assume big
// get fixed size portion
var incoming = make([]byte, 1+2+4)
var err = binary.Read(reader, binary.LittleEndian, incoming)
if err != nil {
return nil, err
}
var memReader = bytes.NewBuffer(incoming)
var f = &WireFrame{}
// The reads from memReader are guaranteed to succeed because the 7 bytes
// were allocated above and that is what is read out
// frame type
frameType, _ := ReadOctet(memReader)
f.FrameType = frameType
// channel
channel, _ := ReadShort(memReader)
f.Channel = channel
// Variable length part
var length uint32
err = binary.Read(memReader, binary.BigEndian, &length)
var slice = make([]byte, length+1)
err = binary.Read(reader, binary.BigEndian, slice)
if err != nil {
return nil, errors.New("Bad frame payload: " + err.Error())
}
f.Payload = slice[0:length]
return f, nil
}
// Fields
func ReadOctet(buf io.Reader) (data byte, err error) {
err = binary.Read(buf, binary.BigEndian, &data)
if err != nil {
return 0, errors.New("Could not read byte: " + err.Error())
}
return data, nil
}
func ReadShort(buf io.Reader) (data uint16, err error) {
err = binary.Read(buf, binary.BigEndian, &data)
if err != nil {
return 0, errors.New("Could not read uint16: " + err.Error())
}
return data, nil
}
func ReadLong(buf io.Reader) (data uint32, err error) {
err = binary.Read(buf, binary.BigEndian, &data)
if err != nil {
return 0, errors.New("Could not read uint32: " + err.Error())
}
return data, nil
}
func ReadLonglong(buf io.Reader) (data uint64, err error) {
err = binary.Read(buf, binary.BigEndian, &data)
if err != nil {
return 0, errors.New("Could not read uint64: " + err.Error())
}
return data, nil
}
func ReadShortstr(buf io.Reader) (string, error) {
var length uint8
var err = binary.Read(buf, binary.BigEndian, &length)
if err != nil {
return "", err
}
var slice = make([]byte, length)
err = binary.Read(buf, binary.BigEndian, slice)
if err != nil {
return "", err
}
return string(slice), nil
}
func ReadLongstr(buf io.Reader) ([]byte, error) {
var length uint32
var err = binary.Read(buf, binary.BigEndian, &length)
if err != nil {
return nil, err
}
var slice = make([]byte, length)
err = binary.Read(buf, binary.BigEndian, slice)
if err != nil {
return nil, err
}
return slice, err
}
// Can't get coverage on this easily since I can't currently generate
// timestamp values in Tables because protobuf doesn't give me a type that
// is different from uint64
func ReadTimestamp(buf io.Reader) (uint64, error) { // pragma: nocover
var t uint64
var err = binary.Read(buf, binary.BigEndian, &t)
if err != nil { // pragma: nocover
return 0, errors.New("Could not read uint64")
}
return t, nil // pragma: nocover
}
func ReadTable(reader io.Reader, strictMode bool) (*Table, error) {
var seen = make(map[string]bool)
var table = &Table{Table: make([]*FieldValuePair, 0)}
var byteData, err = ReadLongstr(reader)
if err != nil {
return nil, errors.New("Error reading table longstr: " + err.Error())
}
var data = bytes.NewBuffer(byteData)
for data.Len() > 0 {
key, err := ReadShortstr(data)
if err != nil {
return nil, errors.New("Error reading key: " + err.Error())
}
if _, found := seen[key]; found {
return nil, fmt.Errorf("Duplicate key in table: %s", key)
}
value, err := readValue(data, strictMode)
if err != nil {
return nil, errors.New("Error reading value for '" + key + "': " + err.Error())
}
table.Table = append(table.Table, &FieldValuePair{Key: &key, Value: value})
seen[key] = true
}
return table, nil
}
func readValue(reader io.Reader, strictMode bool) (*FieldValue, error) {
var t, err = ReadOctet(reader)
if err != nil {
return nil, err
}
switch {
case t == 't':
var v, err = ReadOctet(reader)
if err != nil {
return nil, err
}
var vb = v != 0
return &FieldValue{Value: &FieldValue_VBoolean{VBoolean: vb}}, nil
case t == 'b':
var v int8
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VInt8{VInt8: v}}, nil
case t == 'B' && strictMode:
var v uint8
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VUint8{VUint8: v}}, nil
case t == 'U' && strictMode || t == 's' && !strictMode:
var v int16
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VInt16{VInt16: v}}, nil
case t == 'u' && strictMode:
var v uint16
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VUint16{VUint16: v}}, nil
case t == 'I':
var v int32
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VInt32{VInt32: v}}, nil
case t == 'i' && strictMode:
var v uint32
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VUint32{VUint32: v}}, nil
case t == 'L' && strictMode || t == 'l' && !strictMode:
var v int64
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VInt64{VInt64: v}}, nil
case t == 'l' && strictMode:
var v uint64
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VUint64{VUint64: v}}, nil
case t == 'f':
var v float32
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VFloat{VFloat: v}}, nil
case t == 'd':
var v float64
if err = binary.Read(reader, binary.BigEndian, &v); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VDouble{VDouble: v}}, nil
case t == 'D':
var scale uint8 = 0
var val int32 = 0
var v = Decimal{&scale, &val}
if err = binary.Read(reader, binary.BigEndian, v.Scale); err != nil {
return nil, err
}
if err = binary.Read(reader, binary.BigEndian, v.Value); err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VDecimal{VDecimal: &v}}, nil
case t == 's' && strictMode:
v, err := ReadShortstr(reader)
if err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VShortstr{VShortstr: v}}, nil
case t == 'S':
v, err := ReadLongstr(reader)
if err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VLongstr{VLongstr: v}}, nil
case t == 'A':
v, err := readArray(reader, strictMode)
if err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VArray{VArray: &FieldArray{Value: v}}}, nil
case t == 'T':
v, err := ReadTimestamp(reader)
if err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VTimestamp{VTimestamp: v}}, nil
case t == 'F':
v, err := ReadTable(reader, strictMode)
if err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VTable{VTable: v}}, nil
case t == 'V':
return nil, nil
case t == 'x':
v, err := ReadLongstr(reader)
if err != nil {
return nil, err
}
return &FieldValue{Value: &FieldValue_VBytes{VBytes: v}}, nil
}
return nil, fmt.Errorf("Unknown table value type '%c' (%d)", t, t)
}
func readArray(reader io.Reader, strictMode bool) ([]*FieldValue, error) {
var ret = make([]*FieldValue, 0, 0)
var longstr, errs = ReadLongstr(reader)
if errs != nil {
return nil, errs
}
var data = bytes.NewBuffer(longstr)
for data.Len() > 0 {
var value, err = readValue(data, strictMode)
if err != nil {
return nil, err
}
ret = append(ret, value)
}
return ret, nil
}
func (props *BasicContentHeaderProperties) ReadProps(flags uint16, reader io.Reader, strictMode bool) (err error) {
if MaskContentType&flags != 0 {
v, err := ReadShortstr(reader)
props.ContentType = &v
if err != nil {
return err
}
}
if MaskContentEncoding&flags != 0 {
v, err := ReadShortstr(reader)
props.ContentEncoding = &v
if err != nil {
return err
}
}
if MaskHeaders&flags != 0 {
v, err := ReadTable(reader, strictMode)
props.Headers = v
if err != nil {
return err
}
}
if MaskDeliveryMode&flags != 0 {
v, err := ReadOctet(reader)
props.DeliveryMode = &v
if err != nil {
return err
}
}
if MaskPriority&flags != 0 {
v, err := ReadOctet(reader)
props.Priority = &v
if err != nil {
return err
}
}
if MaskCorrelationId&flags != 0 {
v, err := ReadShortstr(reader)
props.CorrelationId = &v
if err != nil {
return err
}
}
if MaskReplyTo&flags != 0 {
v, err := ReadShortstr(reader)
props.ReplyTo = &v
if err != nil {
return err
}
}
if MaskExpiration&flags != 0 {
v, err := ReadShortstr(reader)
props.Expiration = &v
if err != nil {
return err
}
}
if MaskMessageId&flags != 0 {
v, err := ReadShortstr(reader)
props.MessageId = &v
if err != nil {
return err
}
}
if MaskTimestamp&flags != 0 {
v, err := ReadLonglong(reader)
props.Timestamp = &v
if err != nil {
return err
}
}
if MaskType&flags != 0 {
v, err := ReadShortstr(reader)
props.Type = &v
if err != nil {
return err
}
}
if MaskUserId&flags != 0 {
v, err := ReadShortstr(reader)
props.UserId = &v
if err != nil {
return err
}
}
if MaskAppId&flags != 0 {
v, err := ReadShortstr(reader)
props.AppId = &v
if err != nil {
return err
}
}
if MaskReserved&flags != 0 {
v, err := ReadShortstr(reader)
props.Reserved = &v
if err != nil {
return err
}
}
return nil
}