chore: add spanner_grpc_config.json and enable grpc-gcp support for spanner (#503)

Author: WeiranFang

src/index.ts

@@ -40,6 +40,8 @@ const gapic = Object.freeze({
   v1: require('./v1'),
 });
 
+const gcpApiConfig = require('./spanner_grpc_config.json');
+
 /*!
  * DO NOT DELETE THE FOLLOWING NAMESPACE DEFINITIONS
  */
@@ -206,6 +208,9 @@ class Spanner extends Service {
         },
         options || {});
 
+    // Enable grpc-gcp support
+    options = Object.assign({'grpc_gcp.apiConfig': gcpApiConfig}, options);
+
     const config = {
       baseUrl: options.servicePath || gapic.v1.SpannerClient.servicePath,
       protosDir: path.resolve(__dirname, '../protos'),

src/spanner_grpc_config.json

@@ -0,0 +1,92 @@
+{
+	"channelPool": {
+		"maxSize": 10,
+		"maxConcurrentStreamsLowWatermark": 100
+	},
+	"method": [
+		{
+			"name": [ "/google.spanner.v1.Spanner/CreateSession" ],
+			"affinity": {
+				"command": "BIND",
+				"affinityKey": "name"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/GetSession" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "name"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/DeleteSession" ],
+			"affinity": {
+				"command": "UNBIND",
+				"affinityKey": "name"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/ExecuteSql" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/ExecuteStreamingSql" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/Read" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/StreamingRead" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/BeginTransaction" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/Commit" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/Rollback" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/PartitionQuery" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		},
+		{
+			"name": [ "/google.spanner.v1.Spanner/PartitionRead" ],
+			"affinity": {
+				"command": "BOUND",
+				"affinityKey": "session"
+			}
+		}
+	]
+}

test/index.ts

@@ -27,6 +27,8 @@ import * as pfy from '@google-cloud/promisify';
 import * as sinon from 'sinon';
 import * as spnr from '../src';
 
+const apiConfig = require('../src/spanner_grpc_config.json');
+
 function getFake(obj: {}) {
   return obj as {
     calledWith_: IArguments;
@@ -187,6 +189,7 @@ describe('Spanner', () => {
         libName: 'gccl',
         libVersion: require('../../package.json').version,
         scopes: [],
+        'grpc_gcp.apiConfig': apiConfig,
       });
 
       assert.deepStrictEqual(
@@ -205,6 +208,7 @@ describe('Spanner', () => {
         libName: 'gccl',
         libVersion: require('../../package.json').version,
         scopes: expectedScopes,
+        'grpc_gcp.apiConfig': apiConfig,
       });
 
       assert.deepStrictEqual(
@@ -235,6 +239,7 @@ describe('Spanner', () => {
             libName: 'gccl',
             libVersion: require('../../package.json').version,
             scopes: [],
+            'grpc_gcp.apiConfig': apiConfig,
           }));
     });
 

tsconfig.json

@@ -3,12 +3,14 @@
   "compilerOptions": {
     "rootDir": ".",
     "outDir": "build",
-    "noImplicitAny": false
+    "noImplicitAny": false,
+    "resolveJsonModule": true
   },
   "include": [
     "src/*.ts",
     "src/v1/*.d.ts",
     "src/**/*.js",
+    "src/**/*.json",
     "test/*.ts",
     "system-test/*.ts",
   ]