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Catherine.Doce · ‎03-04-2020

Great Peter, exitcall.getCorrelationHeader(), this what I was looking for. Noe the first Lambda generates the correlation header then fetch the outgoing header and send it to each Lambda through it's exit call. Thanks a lot for your help, I'll mark this case as solved. Please let me know if I need to do anything else, like put ranks for you or anything else should be done when I'm closing a post. This is my first post on AppD community. Thanks

Catherine.Doce · ‎03-02-2020

Hi Peter, I passed a correct formate header to the first lambda and it's succeeded to pass it to the second lambda and correlate the transaction created from the first lambda, but I found that, the first Lambda is correlating to itself. I want the first Lambda to start the Transaction and generate the correlation header, then fetch this header and send it to the second Lambda. Any idea how I can fetch the generated header from first Lambda? what Package in AppD I can call it to get the generated header? Thanks

Catherine.Doce · ‎02-27-2020

Thanks Peter for your reply. Actually, I don't know how the correlation header should look like. I tried many entries, but in every time it returns malformed header and generate a new one like: [AppDynamics Tracer] [DEBUG]: Correlation Header generated => com.appdynamics.serverless.tracers.aws.correlation.CorrelationHeader@3fee9989 This is why I used it same as the generated value com.appdynamics.serverless.tracers.aws.correlation.CorrelationHeader without the sequence number at the end. Yes, I get a header chain generated after that and looks like that: HeaderChain{root='appId=300*ctrlguid=1570069847*acctguid=a678f643-40d2-4d5d-8a32-636b904e6186*ts=1582757985080*btid=145515*guid=98faae3f-ddfb-4904-bc01-19078418956d', fromCompChain='174213', toCompChain='', exitTypeCallChain='', exitSubtypeCallChain='', snapshotEnabledSet=false, fromCompIds=[174213], threadCallChainForOutOfProcess='null'} But, the generated correlation header is not fetched by the second Lambda. Second Lambda code: public String handleRequest(SNSEvent event, Context context) { String snsMsg = "Hello From Lambda To SNS"; String messasge = event.getRecords().get(0).getSNS().getMessage(); String correlationHeader=""; //Instantiate the tracer Tracer tracer = AppDynamics.getTracer(context); com.appdynamics.serverless.tracers.dependencies.com.google.gson.JsonParser parser = new JsonParser(); JsonObject inputObject = parser.parse(messasge).getAsJsonObject(); if (inputObject.has(Tracer.APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY)) { System.out.println("corrHeader in tracer"); correlationHeader = inputObject.get(Tracer.APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY).getAsString(); System.out.println(correlationHeader); } else { //Try reading from HTTP headers if (inputObject.has("headers")) { System.out.println("corrHeader in headers"); JsonObject httpHeaders = inputObject.getAsJsonObject("headers"); if (httpHeaders.has(Tracer.APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY)) { correlationHeader = httpHeaders.get(Tracer.APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY).getAsString(); System.out.println(correlationHeader); } } } //Create Transaction Transaction transaction = tracer.createTransaction(correlationHeader); //Start the transaction monitoring. transaction.start(); //Lambda code try{ context.getLogger().log("SNS Message: " + snsMsg); context.getLogger().log(event.getRecords().get(0).getSNS().getMessage()); return null; } finally { transaction.stop(); AppDynamics.cleanup(); } } } Cloud watch logs that showing receiving message to this Lambda: { "singularityheader": "com.appdynamics.serverless.tracers.aws.correlation.CorrelationHeader", "msg": "Hello from InitSample to SNS" } I'm still missing something on how to pass the generated header from the first lambda to the second one? Thanks

Catherine.Doce · ‎02-26-2020

Hi, I'm working on instrumenting Java Lambda. My environment contains 2 lambdas. the first one is triggering the second one through SNS. Also, implemented the sns exit call from the first lambda. Now, I'm trying to correlate the business transaction to be the same as started from the first lambda and passing to the second one. I'm using Manual Instrumentation and followed AppDynamics documentation: https://docs.appdynamics.com/display/PRO45/Manual+Tracer+Instrumentation This is a snippet from my code on how I'm fetching the correlation header from an input: public Context handleRequest (InputStream input , Context context) { if ( runAppDynamics ) { //Instantiate the tracer Tracer tracer = AppDynamics. getTracer (context) ; //Automatically Parse the correlation header InputStream inputStream = InputStreamConverter. convertToMarkSupportedInputStream (input) ; try { String inputAsString = IOUtils. toString (inputStream , Charset. forName ( "UTF-8" )) ; com.appdynamics.serverless.tracers.dependencies.com.google.gson.JsonParser parser = new JsonParser() ; JsonObject inputObject = parser.parse(inputAsString).getAsJsonObject() ; if (inputObject.has(Tracer. APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY )) { System. out .println( "corrHeader in tracer" ) ; correlationHeader = inputObject.get(Tracer. APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY ).getAsString() ; } else { //Try reading from HTTP headers if (inputObject.has( "headers" )) { System. out .println( "corrHeader in headers" ) ; JsonObject httpHeaders = inputObject.getAsJsonObject( "headers" ) ; if (httpHeaders.has(Tracer. APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY )) { correlationHeader = httpHeaders.get(Tracer. APPDYNAMICS_TRANSACTION_CORRELATION_HEADER_KEY ).getAsString() ; } } } } catch (IOException e){} if ( correlationHeader == null ) { correlationHeader = "corrheadertest" ; } //Create Transaction transaction = tracer.createTransaction( correlationHeader ) ; //Start the transaction monitoring. transaction .start() ; This is the Lambda Test input: { "key": "Content-Type", "singularityheader": "com.appdynamics.serverless.tracers.aws.correlation.CorrelationHeader" } Every time I test my Lambda it didn't correlate and cloud watch logs return: [AppDynamics Tracer] [DEBUG]: Creating transaction for header [com.appdynamics.serverless.tracers.aws.correlation.CorrelationHeader] [AppDynamics Tracer] [DEBUG]: Processing continuing transaction => com.appdynamics.serverless.tracers.aws.correlation.CorrelationHeader [AppDynamics Tracer] [DEBUG]: Caller chains read => [] [AppDynamics Tracer] [DEBUG]: Not correlating transaction due to potentially malformed header [com.appdynamics.serverless.tracers.aws.correlation.CorrelationHeader] I tried to change the value many times to represent valid correlation header, but it gives me the same message for every value I put. Any idea what I'm missing here and what should be a valid correlation header? Thanks

Date Registered	‎10-22-2018 08:08 PM
Date Last Visited	‎03-05-2020 03:15 PM
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