Change extension detection mechanism (#131)

* Change method of extension detection to use the filesystem

* Fix agent path

* Remove unused import

* Change lambda tracing to not include extension flushing

* Wrap handler correctly

* Fix lint error

Author: DarcyRaynerDD

integration_tests/snapshots/logs/async-metrics_node10.log

@@ -1,5 +1,4 @@
 START RequestId: XXXX Version: $LATEST
-HTTP GET http://127.0.0.1:8124/lambda/hello Headers: ["content-type:application/json","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]
 {"e":XXXX,"m":"aws.lambda.enhanced.invocations","t":["region:us-east-1","account_id:XXXX","functionname:integration-dev-async-metrics_node10","resource:integration-dev-async-metrics_node10","cold_start:true","memorysize:1024","datadog_lambda:vX.X.X","runtime:nodejs10.x"],"v":1}
 {"e":XXXX,"m":"serverless.integration_test.execution","t":["tagkey:tagvalue","eventsource:APIGateway","dd_lambda_layer:datadog-nodev10.XX.X"],"v":1}
 XXXX-XX-XX XX:XX:XX.XXX	XXXX-XXXX-XXXX-XXXX-XXXX	INFO	[dd.trace_id=XXXX dd.span_id=XXXX] Processed APIGateway request

integration_tests/snapshots/logs/async-metrics_node12.log

@@ -1,5 +1,4 @@
 START RequestId: XXXX Version: $LATEST
-HTTP GET http://127.0.0.1:8124/lambda/hello Headers: ["content-type:application/json","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]
 {"e":XXXX,"m":"aws.lambda.enhanced.invocations","t":["region:us-east-1","account_id:XXXX","functionname:integration-dev-async-metrics_node12","resource:integration-dev-async-metrics_node12","cold_start:true","memorysize:1024","datadog_lambda:vX.X.X","runtime:nodejs12.x"],"v":1}
 {"e":XXXX,"m":"serverless.integration_test.execution","t":["tagkey:tagvalue","eventsource:APIGateway","dd_lambda_layer:datadog-nodev12.XX.X"],"v":1}
 XXXX-XX-XX XX:XX:XX.XXX	XXXX-XXXX-XXXX-XXXX-XXXX	INFO	[dd.trace_id=XXXX dd.span_id=XXXX] Processed APIGateway request

integration_tests/snapshots/logs/http-requests_node10.log

@@ -1,5 +1,4 @@
 START RequestId: XXXX Version: $LATEST
-HTTP GET http://127.0.0.1:8124/lambda/hello Headers: ["content-type:application/json","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]
 {"e":XXXX,"m":"aws.lambda.enhanced.invocations","t":["region:us-east-1","account_id:XXXX","functionname:integration-dev-http-requests_node10","resource:integration-dev-http-requests_node10","cold_start:true","memorysize:1024","datadog_lambda:vX.X.X","runtime:nodejs10.x"],"v":1}
 HTTP GET https://ip-ranges.datadoghq.com/ Headers: ["Accept:application/json, text/plain, */*","User-Agent:axios/0.19.2","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]
 HTTP GET https://ip-ranges.datadoghq.eu/ Headers: ["Accept:application/json, text/plain, */*","User-Agent:axios/0.19.2","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]

integration_tests/snapshots/logs/http-requests_node10_with_plugin.log

@@ -2,7 +2,7 @@ START RequestId: XXXX Version: $LATEST
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 {"e":XXXX,"m":"serverless.integration_test.execution","t":["function:http-request","dd_lambda_layer:datadog-nodev10.XX.X"],"v":1}
 XXXX-XX-XX XX:XX:XX.XXX	XXXX-XXXX-XXXX-XXXX-XXXX	INFO	[dd.trace_id=XXXX dd.span_id=XXXX] Snapshot test http requests successfully made to URLs: https://ip-ranges.datadoghq.com,https://ip-ranges.datadoghq.eu
-{"traces":[[{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"http.request","resource":"GET","error":1,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node10_with_plugin","span.kind":"client","http.method":"GET","http.url":"http://127.0.0.1:8124/lambda/hello","error.type":"Error","error.msg":"connect ECONNREFUSED 127.0.0.1:8124","error.stack":"Error: connect ECONNREFUSED 127.0.0.1:8124\n    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1107:14)"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"integration-plugin-dev-http-requests_node10_with_plugin-http-client","type":"http"},{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"http.request","resource":"GET","error":0,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node10_with_plugin","span.kind":"client","http.method":"GET","http.url":"https://ip-ranges.datadoghq.com/","http.status_code":"200"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"integration-plugin-dev-http-requests_node10_with_plugin-http-client","type":"http"},{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"http.request","resource":"GET","error":0,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node10_with_plugin","span.kind":"client","http.method":"GET","http.url":"https://ip-ranges.datadoghq.eu/","http.status_code":"200"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"integration-plugin-dev-http-requests_node10_with_plugin-http-client","type":"http"},{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"aws.lambda","resource":"integration-plugin-dev-http-requests_node10_with_plugin","error":0,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node10_with_plugin","cold_start":"true","function_arn":"XXXX_node10_with_plugin","function_version":"$LATEST","request_id":"XXXX","resource_names":"integration-plugin-dev-http-requests_node10_with_plugin","datadog_lambda":"XXXX","dd_trace":"XXXX","_dd.parent_source":"xray"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"aws.lambda","type":"serverless"}]]}
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 END RequestId: XXXX
 REPORT RequestId: XXXX	Duration: XXXX ms	Billed Duration: XXXX ms	Memory Size: 1024 MB	Max Memory Used: XXXX MB	Init Duration: XXXX ms	
 XRAY TraceId: XXXX	SegmentId: XXXX	Sampled: true	

integration_tests/snapshots/logs/http-requests_node12.log

@@ -1,5 +1,4 @@
 START RequestId: XXXX Version: $LATEST
-HTTP GET http://127.0.0.1:8124/lambda/hello Headers: ["content-type:application/json","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]
 {"e":XXXX,"m":"aws.lambda.enhanced.invocations","t":["region:us-east-1","account_id:XXXX","functionname:integration-dev-http-requests_node12","resource:integration-dev-http-requests_node12","cold_start:true","memorysize:1024","datadog_lambda:vX.X.X","runtime:nodejs12.x"],"v":1}
 HTTP GET https://ip-ranges.datadoghq.com/ Headers: ["Accept:application/json, text/plain, */*","User-Agent:axios/0.19.2","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]
 HTTP GET https://ip-ranges.datadoghq.eu/ Headers: ["Accept:application/json, text/plain, */*","User-Agent:axios/0.19.2","x-datadog-parent-id:XXXX","x-datadog-sampling-priority:2","x-datadog-trace-id:XXXX"]

integration_tests/snapshots/logs/http-requests_node12_with_plugin.log

@@ -2,7 +2,7 @@ START RequestId: XXXX Version: $LATEST
 {"e":XXXX,"m":"aws.lambda.enhanced.invocations","t":["region:us-east-1","account_id:XXXX","functionname:integration-plugin-dev-http-requests_node12_with_plugin","resource:integration-plugin-dev-http-requests_node12_with_plugin","cold_start:true","memorysize:1024","datadog_lambda:vX.X.X","runtime:nodejs12.x"],"v":1}
 {"e":XXXX,"m":"serverless.integration_test.execution","t":["function:http-request","dd_lambda_layer:datadog-nodev12.XX.X"],"v":1}
 XXXX-XX-XX XX:XX:XX.XXX	XXXX-XXXX-XXXX-XXXX-XXXX	INFO	[dd.trace_id=XXXX dd.span_id=XXXX] Snapshot test http requests successfully made to URLs: https://ip-ranges.datadoghq.com,https://ip-ranges.datadoghq.eu
-{"traces":[[{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"http.request","resource":"GET","error":1,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node12_with_plugin","span.kind":"client","http.method":"GET","http.url":"http://127.0.0.1:8124/lambda/hello","error.type":"Error","error.msg":"connect ECONNREFUSED 127.0.0.1:8124","error.stack":"Error: connect ECONNREFUSED 127.0.0.1:8124\n    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1141:16)\n    at TCPConnectWrap.callbackTrampoline (internal/async_hooks.js:120:14)"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"integration-plugin-dev-http-requests_node12_with_plugin-http-client","type":"http"},{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"http.request","resource":"GET","error":0,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node12_with_plugin","span.kind":"client","http.method":"GET","http.url":"https://ip-ranges.datadoghq.com/","http.status_code":"200"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"integration-plugin-dev-http-requests_node12_with_plugin-http-client","type":"http"},{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"http.request","resource":"GET","error":0,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node12_with_plugin","span.kind":"client","http.method":"GET","http.url":"https://ip-ranges.datadoghq.eu/","http.status_code":"200"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"integration-plugin-dev-http-requests_node12_with_plugin-http-client","type":"http"},{"trace_id":"XXXX","span_id":"XXXX","parent_id":"XXXX","name":"aws.lambda","resource":"integration-plugin-dev-http-requests_node12_with_plugin","error":0,"meta":{"_dd.origin":"lambda","service":"integration-plugin-dev-http-requests_node12_with_plugin","cold_start":"true","function_arn":"XXXX_node12_with_plugin","function_version":"$LATEST","request_id":"XXXX","resource_names":"integration-plugin-dev-http-requests_node12_with_plugin","datadog_lambda":"XXXX","dd_trace":"XXXX","_dd.parent_source":"xray"},"metrics":{"_sample_rate":1,"_sampling_priority_v1":2},"start":XXXX,"duration":XXXX,"service":"aws.lambda","type":"serverless"}]]}
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 END RequestId: XXXX
 REPORT RequestId: XXXX	Duration: XXXX ms	Billed Duration: XXXX ms	Memory Size: 1024 MB	Max Memory Used: XXXX MB	Init Duration: XXXX ms	
 XRAY TraceId: XXXX	SegmentId: XXXX	Sampled: true	

integration_tests/snapshots/logs/process-input-traced_node10.log

@@ -1,7 +1,7 @@
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 {"e":XXXX,"m":"aws.lambda.enhanced.invocations","t":["region:us-east-1","account_id:XXXX","functionname:integration-dev-process-input-traced_node10","resource:integration-dev-process-input-traced_node10","cold_start:true","memorysize:1024","datadog_lambda:vX.X.X","runtime:nodejs10.x"],"v":1}
 {"e":XXXX,"m":"serverless.integration_test.execution","t":["function:process-input-traced","dd_lambda_layer:datadog-nodev10.XX.X"],"v":1}
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 END RequestId: XXXX
 REPORT RequestId: XXXX	Duration: XXXX ms	Billed Duration: XXXX ms	Memory Size: 1024 MB	Max Memory Used: XXXX MB	Init Duration: XXXX ms	
 XRAY TraceId: XXXX	SegmentId: XXXX	Sampled: true