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package main
import (
"bytes"
"context"
"github.com/eciavatta/caronte/parsers"
log "github.com/sirupsen/logrus"
"time"
)
const InitialPayloadsSize = 1024
const DefaultQueryFormatLimit = 8024
const InitialRegexSlicesCount = 8
type ConnectionStream struct {
ID RowID `bson:"_id"`
ConnectionID RowID `bson:"connection_id"`
FromClient bool `bson:"from_client"`
DocumentIndex int `bson:"document_index"`
Payload []byte `bson:"payload"`
BlocksIndexes []int `bson:"blocks_indexes"`
BlocksTimestamps []time.Time `bson:"blocks_timestamps"`
BlocksLoss []bool `bson:"blocks_loss"`
PatternMatches map[uint][]PatternSlice `bson:"pattern_matches"`
}
type PatternSlice [2]uint64
type Payload struct {
FromClient bool `json:"from_client"`
Content string `json:"content"`
Metadata parsers.Metadata `json:"metadata"`
IsMetadataContinuation bool `json:"is_metadata_continuation"`
Index int `json:"index"`
Timestamp time.Time `json:"timestamp"`
IsRetransmitted bool `json:"is_retransmitted"`
RegexMatches []RegexSlice `json:"regex_matches"`
}
type RegexSlice struct {
From uint64 `json:"from"`
To uint64 `json:"to"`
}
type QueryFormat struct {
Format string `form:"format"`
Skip uint64 `form:"skip"`
Limit uint64 `form:"limit"`
}
type ConnectionStreamsController struct {
storage Storage
}
func NewConnectionStreamsController(storage Storage) ConnectionStreamsController {
return ConnectionStreamsController{
storage: storage,
}
}
func (csc ConnectionStreamsController) GetConnectionPayload(c context.Context, connectionID RowID,
format QueryFormat) []*Payload {
payloads := make([]*Payload, 0, InitialPayloadsSize)
var clientIndex, serverIndex, globalIndex uint64
if format.Limit <= 0 {
format.Limit = DefaultQueryFormatLimit
}
var clientBlocksIndex, serverBlocksIndex int
var clientDocumentIndex, serverDocumentIndex int
clientStream := csc.getConnectionStream(c, connectionID, true, clientDocumentIndex)
serverStream := csc.getConnectionStream(c, connectionID, false, serverDocumentIndex)
hasClientBlocks := func() bool {
return clientBlocksIndex < len(clientStream.BlocksIndexes)
}
hasServerBlocks := func() bool {
return serverBlocksIndex < len(serverStream.BlocksIndexes)
}
var payload *Payload
payloadsBuffer := make([]*Payload, 0, 16)
contentChunkBuffer := new(bytes.Buffer)
var lastContentSlice []byte
var sideChanged, lastClient, lastServer bool
for !clientStream.ID.IsZero() || !serverStream.ID.IsZero() {
if hasClientBlocks() && (!hasServerBlocks() || // next payload is from client
clientStream.BlocksTimestamps[clientBlocksIndex].UnixNano() <=
serverStream.BlocksTimestamps[serverBlocksIndex].UnixNano()) {
start := clientStream.BlocksIndexes[clientBlocksIndex]
end := 0
if clientBlocksIndex < len(clientStream.BlocksIndexes)-1 {
end = clientStream.BlocksIndexes[clientBlocksIndex+1]
} else {
end = len(clientStream.Payload)
}
size := uint64(end - start)
payload = &Payload{
FromClient: true,
Content: DecodeBytes(clientStream.Payload[start:end], format.Format),
Index: start,
Timestamp: clientStream.BlocksTimestamps[clientBlocksIndex],
IsRetransmitted: clientStream.BlocksLoss[clientBlocksIndex],
RegexMatches: findMatchesBetween(clientStream.PatternMatches, clientIndex, clientIndex+size),
}
clientIndex += size
globalIndex += size
clientBlocksIndex++
lastContentSlice = clientStream.Payload[start:end]
sideChanged, lastClient, lastServer = lastServer, true, false
} else { // next payload is from server
start := serverStream.BlocksIndexes[serverBlocksIndex]
end := 0
if serverBlocksIndex < len(serverStream.BlocksIndexes)-1 {
end = serverStream.BlocksIndexes[serverBlocksIndex+1]
} else {
end = len(serverStream.Payload)
}
size := uint64(end - start)
payload = &Payload{
FromClient: false,
Content: DecodeBytes(serverStream.Payload[start:end], format.Format),
Index: start,
Timestamp: serverStream.BlocksTimestamps[serverBlocksIndex],
IsRetransmitted: serverStream.BlocksLoss[serverBlocksIndex],
RegexMatches: findMatchesBetween(serverStream.PatternMatches, serverIndex, serverIndex+size),
}
serverIndex += size
globalIndex += size
serverBlocksIndex++
lastContentSlice = serverStream.Payload[start:end]
sideChanged, lastClient, lastServer = lastClient, false, true
}
if !hasClientBlocks() {
clientDocumentIndex++
clientBlocksIndex = 0
clientStream = csc.getConnectionStream(c, connectionID, true, clientDocumentIndex)
}
if !hasServerBlocks() {
serverDocumentIndex++
serverBlocksIndex = 0
serverStream = csc.getConnectionStream(c, connectionID, false, serverDocumentIndex)
}
updateMetadata := func() {
metadata := parsers.Parse(contentChunkBuffer.Bytes())
var isMetadataContinuation bool
for _, elem := range payloadsBuffer {
elem.Metadata = metadata
elem.IsMetadataContinuation = isMetadataContinuation
isMetadataContinuation = true
}
payloadsBuffer = payloadsBuffer[:0]
contentChunkBuffer.Reset()
}
if sideChanged {
updateMetadata()
}
payloadsBuffer = append(payloadsBuffer, payload)
contentChunkBuffer.Write(lastContentSlice)
if clientStream.ID.IsZero() && serverStream.ID.IsZero() {
updateMetadata()
}
if globalIndex > format.Skip {
// problem: waste of time if the payload is discarded
payloads = append(payloads, payload)
}
if globalIndex > format.Skip+format.Limit {
// problem: the last chunk is not parsed, but can be ok because it is not finished
updateMetadata()
return payloads
}
}
return payloads
}
func (csc ConnectionStreamsController) getConnectionStream(c context.Context, connectionID RowID, fromClient bool,
documentIndex int) ConnectionStream {
var result ConnectionStream
if err := csc.storage.Find(ConnectionStreams).Filter(OrderedDocument{
{"connection_id", connectionID},
{"from_client", fromClient},
{"document_index", documentIndex},
}).Context(c).First(&result); err != nil {
log.WithError(err).WithField("connection_id", connectionID).Panic("failed to get a ConnectionStream")
}
return result
}
func findMatchesBetween(patternMatches map[uint][]PatternSlice, from, to uint64) []RegexSlice {
regexSlices := make([]RegexSlice, 0, InitialRegexSlicesCount)
for _, slices := range patternMatches {
for _, slice := range slices {
if from > slice[1] || to <= slice[0] {
continue
}
log.Info(slice[0], slice[1], from, to)
var start, end uint64
if from > slice[0] {
start = 0
} else {
start = slice[0] - from
}
if to <= slice[1] {
end = to - from
} else {
end = slice[1] - from
}
regexSlices = append(regexSlices, RegexSlice{From: start, To: end})
}
}
return regexSlices
}
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