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extrace raw fullDocument from changed stream #29

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extrace raw fullDocument from changed stream #29

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25 changes: 25 additions & 0 deletions gtm.go
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,7 @@ type Op struct {
Doc interface{} `json:"doc,omitempty"`
UpdateDescription map[string]interface{} `json:"updateDescription,omitempty"`
ResumeToken OpResumeToken `json:"-"`
RawFullDoc interface{} `json:"-"`
}

type ReplStatus struct {
Expand Down Expand Up @@ -144,6 +145,11 @@ type ChangeDoc struct {
UpdateDescription map[string]interface{} "updateDescription"
}

// extract fullDocument as bson.Raw
type fullDocOnly struct {
RawFullDoc bson.Raw "fullDocument"
}

func (cd *ChangeDoc) docId() interface{} {
return cd.DocKey["_id"]
}
Expand Down Expand Up @@ -1325,6 +1331,19 @@ func ConsumeChangeStream(ctx *OpCtx, client *mongo.Client, ns string, o *Options
ctx.ErrC <- errors.Wrap(err, "Error decoding change doc")
break
}

// get raw full document
var fullDoc fullDocOnly
if err = stream.Decode(&fullDoc); err != nil {
ctx.ErrC <- errors.Wrap(err, "Error decoding change doc")
break
}

if len(changeDoc.FullDoc) > 0 && len(fullDoc.RawFullDoc) <= 0 {
ctx.ErrC <- errors.New("extract raw fullDocument fail")
break
}

resumeAfter = changeDoc.Id
startAt = nil
startAfter = nil
Expand Down Expand Up @@ -1371,6 +1390,12 @@ func ConsumeChangeStream(ctx *OpCtx, client *mongo.Client, ns string, o *Options
Timestamp: changeDoc.mapTimestamp(),
ResumeToken: token,
}

// output raw full document
if len(fullDoc.RawFullDoc) > 0 {
op.RawFullDoc = fullDoc.RawFullDoc
}

if op.matchesNsFilter(o) {
if changeDoc.hasUpdate() {
op.UpdateDescription = changeDoc.UpdateDescription
Expand Down