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![Paddy](/assets/img/avatar_default.png)
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
104 lines
2.1 KiB
Go
104 lines
2.1 KiB
Go
package eventstream
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import (
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"bytes"
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"encoding/binary"
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"hash/crc32"
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)
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const preludeLen = 8
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const preludeCRCLen = 4
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const msgCRCLen = 4
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const minMsgLen = preludeLen + preludeCRCLen + msgCRCLen
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const maxPayloadLen = 1024 * 1024 * 16 // 16MB
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const maxHeadersLen = 1024 * 128 // 128KB
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const maxMsgLen = minMsgLen + maxHeadersLen + maxPayloadLen
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var crc32IEEETable = crc32.MakeTable(crc32.IEEE)
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// A Message provides the eventstream message representation.
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type Message struct {
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Headers Headers
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Payload []byte
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}
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func (m *Message) rawMessage() (rawMessage, error) {
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var raw rawMessage
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if len(m.Headers) > 0 {
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var headers bytes.Buffer
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if err := encodeHeaders(&headers, m.Headers); err != nil {
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return rawMessage{}, err
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}
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raw.Headers = headers.Bytes()
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raw.HeadersLen = uint32(len(raw.Headers))
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}
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raw.Length = raw.HeadersLen + uint32(len(m.Payload)) + minMsgLen
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hash := crc32.New(crc32IEEETable)
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binaryWriteFields(hash, binary.BigEndian, raw.Length, raw.HeadersLen)
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raw.PreludeCRC = hash.Sum32()
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binaryWriteFields(hash, binary.BigEndian, raw.PreludeCRC)
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if raw.HeadersLen > 0 {
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hash.Write(raw.Headers)
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}
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// Read payload bytes and update hash for it as well.
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if len(m.Payload) > 0 {
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raw.Payload = m.Payload
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hash.Write(raw.Payload)
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}
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raw.CRC = hash.Sum32()
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return raw, nil
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}
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type messagePrelude struct {
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Length uint32
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HeadersLen uint32
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PreludeCRC uint32
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}
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func (p messagePrelude) PayloadLen() uint32 {
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return p.Length - p.HeadersLen - minMsgLen
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}
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func (p messagePrelude) ValidateLens() error {
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if p.Length == 0 || p.Length > maxMsgLen {
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return LengthError{
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Part: "message prelude",
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Want: maxMsgLen,
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Have: int(p.Length),
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}
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}
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if p.HeadersLen > maxHeadersLen {
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return LengthError{
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Part: "message headers",
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Want: maxHeadersLen,
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Have: int(p.HeadersLen),
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}
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}
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if payloadLen := p.PayloadLen(); payloadLen > maxPayloadLen {
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return LengthError{
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Part: "message payload",
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Want: maxPayloadLen,
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Have: int(payloadLen),
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}
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}
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return nil
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}
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type rawMessage struct {
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messagePrelude
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Headers []byte
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Payload []byte
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CRC uint32
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}
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