Allow customisation of service name (#1056)

Signed-off-by: Assem Hafez <assem.hafez@uber.com>

Author: Assem-Uber

README.md

@@ -21,6 +21,7 @@ Set these environment variables if you need to change their defaults
 | CADENCE_WEB_HOSTNAME         | Host name to serve on                                                         | 0.0.0.0          |
 | CADENCE_ADMIN_SECURITY_TOKEN | Admin token for accessing admin methods                                       | ''               |
 | CADENCE_GRPC_TLS_CA_FILE     | Path to root CA certificate file for enabling one-way TLS on gRPC connections | ''               |
+| CADENCE_WEB_SERVICE_NAME     | Name of the web service used as GRPC caller and OTEL resource name            | cadence-web      |
 
 Note: To connect `cadence-web` to multiple clusters, you will need to add comma-delimted entries for `CADENCE_GRPC_PEERS`, `CADENCE_GRPC_SERVICES_NAMES` & `CADENCE_CLUSTERS_NAMES` for each cluster (each cluster values are grouped by their index within the Comma-delimited lists).
 

src/utils/grpc/grpc-service.ts

@@ -122,7 +122,7 @@ class GRPCService {
     const headers = merge(
       {
         'rpc-service': this.requestConfig.serviceName,
-        'rpc-caller': 'cadence-web',
+        'rpc-caller': process.env.CADENCE_WEB_SERVICE_NAME || 'cadence-web',
         'rpc-encoding': 'proto',
       },
       this.requestConfig.metadata,

src/utils/otel/otel-register.ts

@@ -11,7 +11,8 @@ import { type OtelRegisterConfig } from './otel.types';
 export async function otelRegister(config?: OtelRegisterConfig) {
   const sdk = new NodeSDK({
     resource: resourceFromAttributes({
-      [ATTR_SERVICE_NAME]: 'cadence-web',
+      [ATTR_SERVICE_NAME]:
+        process.env.CADENCE_WEB_SERVICE_NAME || 'cadence-web',
     }),
     textMapPropagator: new JaegerPropagator(),
     traceExporter: new OTLPTraceExporter(),