/
db_protocol.go
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/
db_protocol.go
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// balboa
// Copyright (c) 2019, DCSO GmbH
package db
import (
"bytes"
"errors"
"net"
obs "github.com/DCSO/balboa/observation"
log "github.com/sirupsen/logrus"
"github.com/ugorji/go/codec"
)
const (
TypeInputRequest = 1
TypeQueryRequest = 2
TypeBackupRequest = 3
TypeDumpRequest = 4
TypeErrorResponse = 128
TypeQueryResponse = 129
TypeQueryStreamStartResponse = 130
TypeQueryStreamDataResponse = 131
TypeQueryStreamEndResponse = 132
)
type TypedMessage struct {
Type uint8 `codec:"T"`
EncodedMessage []byte `codec:"M"`
}
type BackupRequest struct {
Path string `codec:"P"`
}
type DumpRequest struct {
Path string `codec:"P"`
}
type QueryRequest struct {
Qrdata, Qrrname, Qrrtype, QsensorID string
Hrdata, Hrrname, Hrrtype, HsensorID bool
Limit int
}
type QueryResponse struct {
Obs []obs.Observation
}
type ErrorResponse struct {
Message string
}
type Encoder struct {
inner *bytes.Buffer
outer *bytes.Buffer
enc *codec.Encoder
}
type Decoder struct {
conn net.Conn
outer_dec *codec.Decoder
inner_dec *codec.Decoder
}
func (enc *Encoder) Release() {
enc.enc.Release()
}
func MakeEncoder() *Encoder {
inner := new(bytes.Buffer)
outer := new(bytes.Buffer)
h := new(codec.MsgpackHandle)
h.ExplicitRelease = true
h.WriteExt = true
enc := codec.NewEncoder(inner, h)
return &Encoder{inner: inner, outer: outer, enc: enc}
}
func MakeDecoder(conn net.Conn) *Decoder {
outer_h := new(codec.MsgpackHandle)
outer_h.ExplicitRelease = true
outer_h.WriteExt = true
outer_dec := codec.NewDecoder(conn, outer_h)
inner_h := new(codec.MsgpackHandle)
inner_h.ExplicitRelease = true
inner_h.WriteExt = true
inner_dec := codec.NewDecoder(new(bytes.Buffer), inner_h)
return &Decoder{inner_dec: inner_dec, outer_dec: outer_dec, conn: conn}
}
func (dec *Decoder) Release() {
dec.inner_dec.Release()
dec.outer_dec.Release()
}
func (dec *Decoder) ExpectQueryResponse() (*QueryResponse, error) {
msg, msg_err := dec.ExpectTypedMessage()
if msg_err != nil {
return nil, msg_err
}
dec.inner_dec.Reset(bytes.NewBuffer(msg.EncodedMessage))
if msg.Type == TypeErrorResponse {
var rep ErrorResponse
inner_err := dec.inner_dec.Decode(&rep)
if inner_err != nil {
return nil, inner_err
}
return nil, errors.New(rep.Message)
}
if msg.Type == TypeQueryResponse {
var rep QueryResponse
inner_err := dec.inner_dec.Decode(&rep)
if inner_err != nil {
return nil, inner_err
}
return &rep, nil
} else if msg.Type == TypeQueryStreamStartResponse {
log.Debugf("got stream start response")
return dec.ExpectQueryStreamResponse()
} else {
return nil, errors.New("invalid query response")
}
}
func (enc *Encoder) EncodeInputRequest(o obs.InputObservation) (*bytes.Buffer, error) {
enc.inner.Reset()
enc.outer.Reset()
enc.enc.Reset(enc.inner)
inner_err := enc.enc.Encode(o)
if inner_err != nil {
return nil, inner_err
}
enc.enc.Reset(enc.outer)
outer_err := enc.enc.Encode(&TypedMessage{Type: TypeInputRequest, EncodedMessage: enc.inner.Bytes()})
if outer_err != nil {
return nil, outer_err
}
return enc.outer, nil
}
func (enc *Encoder) EncodeQueryRequest(qry QueryRequest) (*bytes.Buffer, error) {
enc.inner.Reset()
enc.outer.Reset()
enc.enc.Reset(enc.inner)
inner_err := enc.enc.Encode(qry)
if inner_err != nil {
return nil, inner_err
}
enc.enc.Reset(enc.outer)
outer_err := enc.enc.Encode(&TypedMessage{Type: TypeQueryRequest, EncodedMessage: enc.inner.Bytes()})
if outer_err != nil {
return nil, outer_err
}
return enc.outer, nil
}
func (enc *Encoder) EncodeQueryStreamStartResponse() (*bytes.Buffer, error) {
enc.inner.Reset()
enc.outer.Reset()
enc.enc.Reset(enc.inner)
enc.enc.Reset(enc.outer)
outer_err := enc.enc.Encode(&TypedMessage{Type: TypeQueryStreamStartResponse, EncodedMessage: enc.inner.Bytes()})
if outer_err != nil {
return nil, outer_err
}
return enc.outer, nil
}
func (enc *Encoder) EncodeQueryStreamEndResponse() (*bytes.Buffer, error) {
enc.inner.Reset()
enc.outer.Reset()
enc.enc.Reset(enc.inner)
enc.enc.Reset(enc.outer)
outer_err := enc.enc.Encode(&TypedMessage{Type: TypeQueryStreamEndResponse, EncodedMessage: enc.inner.Bytes()})
if outer_err != nil {
return nil, outer_err
}
return enc.outer, nil
}
func (enc *Encoder) EncodeQueryStreamDataResponse(entry obs.Observation) (*bytes.Buffer, error) {
enc.inner.Reset()
enc.outer.Reset()
enc.enc.Reset(enc.inner)
inner_err := enc.enc.Encode(entry)
if inner_err != nil {
return nil, inner_err
}
enc.enc.Reset(enc.outer)
outer_err := enc.enc.Encode(&TypedMessage{Type: TypeQueryStreamDataResponse, EncodedMessage: enc.inner.Bytes()})
if outer_err != nil {
return nil, outer_err
}
return enc.outer, nil
}
func (dec *Decoder) ExpectInputRequestFromBytes(buf []byte) (*obs.InputObservation, error) {
dec.inner_dec.Reset(bytes.NewBuffer(buf))
var msg obs.InputObservation
err := dec.inner_dec.Decode(&msg)
if err != nil {
return nil, err
}
return &msg, nil
}
func (enc *Encoder) EncodeErrorResponse(err ErrorResponse) (*bytes.Buffer, error) {
enc.inner.Reset()
enc.outer.Reset()
inner_err := enc.enc.Encode(err)
if inner_err != nil {
return nil, inner_err
}
enc.enc.Reset(enc.outer)
outer_err := enc.enc.Encode(&TypedMessage{Type: TypeQueryRequest, EncodedMessage: enc.inner.Bytes()})
if outer_err != nil {
return nil, outer_err
}
return enc.outer, nil
}
func (dec *Decoder) ExpectTypedMessage() (*TypedMessage, error) {
var msg TypedMessage
err := dec.outer_dec.Decode(&msg)
if err != nil {
return nil, err
}
return &msg, nil
}
func (dec *Decoder) ExpectQueryRequestFromBytes(buf []byte) (*QueryRequest, error) {
dec.inner_dec.Reset(bytes.NewBuffer(buf))
var msg QueryRequest
err := dec.inner_dec.Decode(&msg)
if err != nil {
return nil, err
}
return &msg, nil
}
func (dec *Decoder) ExpectBackupRequestFromBytes(buf []byte) (*BackupRequest, error) {
dec.inner_dec.Reset(bytes.NewBuffer(buf))
var msg BackupRequest
err := dec.inner_dec.Decode(&msg)
if err != nil {
return nil, err
}
return &msg, nil
}
func (dec *Decoder) ExpectDumpRequestFromBytes(buf []byte) (*DumpRequest, error) {
dec.inner_dec.Reset(bytes.NewBuffer(buf))
var msg DumpRequest
err := dec.inner_dec.Decode(&msg)
if err != nil {
return nil, err
}
return &msg, nil
}
func (dec *Decoder) ExpectQueryStreamResponse() (*QueryResponse, error) {
var res []obs.Observation
for {
msg, msg_err := dec.ExpectTypedMessage()
if msg_err != nil {
return nil, msg_err
}
dec.inner_dec.Reset(bytes.NewBuffer(msg.EncodedMessage))
if msg.Type == TypeErrorResponse {
var rep ErrorResponse
inner_err := dec.inner_dec.Decode(&rep)
if inner_err != nil {
log.Warnf("got error response during stream data")
return nil, inner_err
}
return nil, errors.New(rep.Message)
} else if msg.Type == TypeQueryStreamDataResponse {
var rep obs.Observation
inner_err := dec.inner_dec.Decode(&rep)
if inner_err != nil {
log.Warnf("decoding stream data response failed")
return nil, inner_err
}
res = append(res, rep)
} else if msg.Type == TypeQueryStreamEndResponse {
return &QueryResponse{Obs: res}, nil
} else {
log.Warnf("invalid message type `%v`", msg.Type)
return nil, errors.New("received invalid message type from backend")
}
}
}