Add option to trace eureka registration

CHANGELOG.md

@@ -6,6 +6,7 @@ This repo is part of the app-server Zowe Component, and the change logs here may
 ## 2.18.1
 - Bugfix: App-server could not register with discovery server when AT-TLS was enabled for app-server. (#581)
 - Bugfix: App-server /server/environment endpoint was missing the "agent" object, causing the Desktop to choose an indirect route to accessing ZSS. This fix improves latency and high availability behavior of ZSS APIs in the Desktop. (#589)
+- Bugfix: When eureka registration experienced a network failure, troubleshooting information was not available. The property `components.app-server.node.mediationLayer.traceTls` now exists for troubleshooting TLS issues. (#591)
 
 ## 2.17.0
 - Enhancement: Added function `isClientAttls(zoweConfig)` within `libs/util.js`. Whenever a plugin makes a network request, it should always use this to determine if a normally HTTPS request should instead be made as HTTP due to AT-TLS handling the TLS when enabled. (#544)

lib/apiml.js

@@ -79,9 +79,9 @@ const MEDIATION_LAYER_INSTANCE_DEFAULTS = (zluxProto, zluxHostname, zluxPort) =>
 }};
 
 function ApimlConnector({ hostName, port, discoveryUrls,
-                          discoveryPort, tlsOptions, eurekaOverrides, isClientAttls }) {
+                          discoveryPort, tlsOptions, eurekaOverrides, isClientAttls, traceTls }) {
   Object.assign(this, { hostName, port, discoveryUrls,
-                        discoveryPort, tlsOptions, eurekaOverrides, isClientAttls });
+                        discoveryPort, tlsOptions, eurekaOverrides, isClientAttls, traceTls });
   //TODO config should never be checked through env var, but is temporarily needed to temporarily read gateway's ATTLS state to provide it with Eureka info it can work with.
   const clientGlobalAttls = process.env['ZWE_zowe_network_client_tls_attls'];
   const clientGatewayAttls = process.env['ZWE_components_gateway_zowe_network_client_tls_attls'];
@@ -246,7 +246,11 @@ ApimlConnector.prototype = {
   },*/
 
   registerMainServerInstance() {
-    const overrideOptions = this.isClientAttls ? {} : Object.assign({},this.tlsOptions)
+    const overrideOptions = this.isClientAttls
+          ? {}
+    //Use server's own TLS options except for TLS tracing.
+          : Object.assign(Object.assign({},this.tlsOptions), {enableTrace: this.traceTls ? true : false});
+
     if (!this.tlsOptions.rejectUnauthorized) {
       //Keeping these certs causes an openssl error 46, unknown cert error in a dev environment
       delete overrideOptions.cert;

lib/index.js

@@ -220,6 +220,7 @@ Server.prototype = {
           port: this.port,
           discoveryUrls: apimlConfig.server.discoveryUrls || [`https://${apimlConfig.server.hostname}:${apimlConfig.server.port}/eureka/`],
           tlsOptions: this.tlsOptions,
+          traceTls: apimlConfig.traceTls,
           eurekaOverrides: apimlConfig.eureka,
           isClientAttls: util.isClientAttls(this.zoweConfig)
         });