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Parse Trace ID From Telemetry Payloads (#113)
* Parse Trace ID From Telemetry Payloads * Wiring up trace ID log decoration
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package telemetry | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "compress/gzip" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "strings" | ||
| ) | ||
|
|
||
| func parsePayload(data []byte) (metadata, uncompressedData map[string]json.RawMessage, err error) { | ||
| var arr [4]json.RawMessage | ||
|
|
||
| if err = json.Unmarshal(data, &arr); nil != err { | ||
| err = fmt.Errorf("unable to unmarshal payload data array: %v", err) | ||
| return | ||
| } | ||
|
|
||
| var dataJSON []byte | ||
| compressed := strings.Trim(string(arr[3]), `"`) | ||
|
|
||
| if dataJSON, err = decodeUncompress(compressed); nil != err { | ||
| err = fmt.Errorf("unable to uncompress payload: %v", err) | ||
| return | ||
| } | ||
|
|
||
| if err = json.Unmarshal(dataJSON, &uncompressedData); nil != err { | ||
| err = fmt.Errorf("unable to unmarshal uncompressed payload: %v", err) | ||
| return | ||
| } | ||
|
|
||
| if err = json.Unmarshal(arr[2], &metadata); nil != err { | ||
| err = fmt.Errorf("unable to unmarshal payload metadata: %v", err) | ||
| return | ||
| } | ||
|
|
||
| return | ||
| } | ||
|
|
||
| func decodeUncompress(input string) ([]byte, error) { | ||
| decoded, err := base64.StdEncoding.DecodeString(input) | ||
| if nil != err { | ||
| return nil, err | ||
| } | ||
|
|
||
| buf := bytes.NewBuffer(decoded) | ||
| gz, err := gzip.NewReader(buf) | ||
| if nil != err { | ||
| return nil, err | ||
| } | ||
|
|
||
| var out bytes.Buffer | ||
| io.Copy(&out, gz) | ||
| gz.Close() | ||
|
|
||
| return out.Bytes(), nil | ||
| } | ||
|
|
||
| // ExtracTraceID extracts the trace ID within a payload, if present | ||
| func ExtractTraceID(data []byte) (string, error) { | ||
| if !bytes.Contains(data, []byte("NR_LAMBDA_MONITORING")) { | ||
| return "", nil | ||
| } | ||
|
|
||
| _, segments, err := parsePayload(data) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| analyticEvents, ok := segments["analytic_event_data"] | ||
| if ok { | ||
| var parsedAnalyticEvents []json.RawMessage | ||
| if err := json.Unmarshal(analyticEvents, &parsedAnalyticEvents); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| if len(parsedAnalyticEvents) == 3 { | ||
| var analyticEvent [][]struct { | ||
| TraceID string `json:"traceId"` | ||
| } | ||
| if err := json.Unmarshal(parsedAnalyticEvents[2], &analyticEvent); err != nil { | ||
| return "", err | ||
| } | ||
| if len(analyticEvent) > 0 && len(analyticEvent[0]) > 0 { | ||
| return analyticEvent[0][0].TraceID, nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| spanEvents, ok := segments["span_event_data"] | ||
| if ok { | ||
| var parsedSpanEvents []json.RawMessage | ||
| if err := json.Unmarshal(spanEvents, &parsedSpanEvents); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| if len(parsedSpanEvents) == 3 { | ||
| var spanEvent [][]struct { | ||
| TraceID string `json:"traceId"` | ||
| } | ||
|
|
||
| if err := json.Unmarshal(parsedSpanEvents[2], &spanEvent); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| if len(spanEvent) > 0 && len(spanEvent[0]) > 0 { | ||
| return spanEvent[0][0].TraceID, nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return "", errors.New("No trace ID found in payload") | ||
| } |
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