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It supports flattening transaction logs into multiple oplog entries for output #33

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It supports flattening transaction logs into multiple oplog entries for output #33

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133 changes: 105 additions & 28 deletions gtm.go
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Original file line number Diff line number Diff line change
Expand Up @@ -71,31 +71,32 @@ const (
)

type Options struct {
After TimestampGenerator
Token ResumeTokenGenenerator
Filter OpFilter
NamespaceFilter OpFilter
OpLogDisabled bool
OpLogDatabaseName string
OpLogCollectionName string
ChannelSize int
BufferSize int
BufferDuration time.Duration
Ordering OrderingGuarantee
WorkerCount int
MaxAwaitTime time.Duration
UpdateDataAsDelta bool
ChangeStreamNs []string
DirectReadNs []string
DirectReadFilter OpFilter
DirectReadSplitMax int32
DirectReadConcur int
DirectReadNoTimeout bool
DirectReadBounded bool
Unmarshal DataUnmarshaller
Pipe PipelineBuilder
PipeAllowDisk bool
Log *log.Logger
After TimestampGenerator
Token ResumeTokenGenenerator
Filter OpFilter
NamespaceFilter OpFilter
OpLogDisabled bool
OpLogDatabaseName string
OpLogCollectionName string
ChannelSize int
BufferSize int
BufferDuration time.Duration
Ordering OrderingGuarantee
WorkerCount int
MaxAwaitTime time.Duration
UpdateDataAsDelta bool
ChangeStreamNs []string
DirectReadNs []string
DirectReadFilter OpFilter
DirectReadSplitMax int32
DirectReadConcur int
DirectReadNoTimeout bool
DirectReadBounded bool
Unmarshal DataUnmarshaller
Pipe PipelineBuilder
PipeAllowDisk bool
DisableFlatTransactionData bool
Log *log.Logger
}

type OpResumeToken struct {
Expand Down Expand Up @@ -714,6 +715,17 @@ func (op *Op) IsDropDatabase() (string, bool) {
return "", false
}

func (op *Op) IsTransactionApplyOps() bool {
if op.IsCommand() && op.Namespace == "admin.$cmd" {
if op.Data != nil {
if _, ok := op.Data["applyOps"]; ok {
return true
}
}
}
return false
}

func (op *Op) IsCommand() bool {
return op.Operation == "c"
}
Expand Down Expand Up @@ -774,13 +786,26 @@ func (buf *OpBuf) Flush(client *mongo.Client, ctx *OpCtx, o *Options) {
}
ns := make(map[string][]interface{})
byId := make(map[interface{}][]*Op)
for _, op := range buf.Entries {
opList := make([]*Op, 0)
var appendOpList = func(op *Op) {
opList = append(opList, op)
if op.IsUpdate() && op.Doc == nil {
idKey := fmt.Sprintf("%s.%v", op.Namespace, op.Id)
ns[op.Namespace] = append(ns[op.Namespace], op.Id)
byId[idKey] = append(byId[idKey], op)
}
}
for _, op := range buf.Entries {
if !o.DisableFlatTransactionData && op.IsTransactionApplyOps() {
for _, newOp := range op.GetTransactionApplyOpsList() {
if newOp.matchesNsFilter(o) {
appendOpList(newOp)
}
}
} else {
appendOpList(op)
}
}
retry:
for n, opIds := range ns {
var parts = strings.SplitN(n, ".", 2)
Expand All @@ -798,7 +823,6 @@ retry:
op.processData(doc, o)
}
}

}
}
if err = cursor.Close(context.Background()); err != nil {
Expand All @@ -809,14 +833,61 @@ retry:
break retry
}
}
for _, op := range buf.Entries {
for _, op := range opList {
if op.matchesFilter(o) {
ctx.OpC <- op
}
}
buf.Entries = nil
}

func (op *Op) GetTransactionApplyOpsList() (ops []*Op) {
if !op.IsCommand() || op.Data == nil {
return
}
if applyOps, ok := op.Data["applyOps"].([]interface{}); ok {
for _, applyOp := range applyOps {
if opData, ok := applyOp.(map[string]interface{}); ok {
namespace, _ := opData["ns"].(string)
operation, _ := opData["op"].(string)
var data map[string]interface{}
var id interface{}
var b bool
var doc interface{}
if data, b = opData["o"].(map[string]interface{}); !b {
continue
}
switch operation {
case "i", "d":
id = data["_id"]
doc = data
case "u":
if update, ok := opData["o2"].(map[string]interface{}); ok {
id = update["_id"]
} else {
continue
}
default:
continue
}
newOp := &Op{
Id: id,
Operation: operation,
Namespace: namespace,
Data: data,
Timestamp: op.Timestamp,
Source: op.Source,
Doc: doc,
UpdateDescription: nil,
ResumeToken: op.ResumeToken,
}
ops = append(ops, newOp)
}
}
}
return
}

func (op *Op) shouldParse() bool {
return op.IsInsert() || op.IsDelete() || op.IsUpdate() || op.IsCommand()
}
Expand Down Expand Up @@ -915,6 +986,12 @@ func (op *Op) ParseLogEntry(entry *OpLog, o *Options) (include bool, err error)
rawField = entry.Doc
op.processData(rawField, o)
}
// The transaction oplog is a special log format,
// which needs to be unpacked here and then flattened into multiple entries in FetchDocuments before being filtered and matched.
if !o.DisableFlatTransactionData && op.IsTransactionApplyOps() {
include = true
return
}
if op.matchesNsFilter(o) {
if op.IsInsert() || op.IsDelete() || op.IsUpdate() {
if op.IsUpdate() {
Expand Down