update: coerce numbers to string, error on other non-string types for env values

Author: edaniszewski

package/lib/compileFunctions.js

@@ -47,13 +47,10 @@ module.exports = {
         'nodejs8';
       funcTemplate.properties.timeout =
         _.get(funcObject, 'timeout') || _.get(this, 'serverless.service.provider.timeout') || '60s';
-      funcTemplate.properties.environmentVariables = _.mapValues(
-        _.merge(
-          {},
-          _.get(this, 'serverless.service.provider.environment'),
-          funcObject.environment // eslint-disable-line comma-dangle
-        ),
-        (value) => value.toString()
+      funcTemplate.properties.environmentVariables = _.transform(
+        _.merge({}, _.get(this, 'serverless.service.provider.environment'), funcObject.environment),
+        (result, value, key) => coerceEnvOrError(result, key, value),
+        {}
       );
       funcTemplate.accessControl.gcpIamPolicy.bindings = _.unionBy(
         _.get(funcObject, 'iam.bindings'),
@@ -201,6 +198,20 @@ const validateIamProperty = (funcObject, functionName) => {
   }
 };
 
+const coerceEnvOrError = (result, key, value) => {
+  if (typeof value === 'string') {
+    result[key] = value;
+  } else if (typeof value === 'number') {
+    result[key] = value.toString();
+  } else {
+    const errorMessage = [
+      `The value for environment variable ${key} is an unsupported type: ${typeof value}.`,
+      ' Values must either be strings or numbers (which are coerced into strings at package time).',
+    ].join('');
+    throw new Error(errorMessage);
+  }
+};
+
 const getFunctionTemplate = (funcObject, projectName, region, sourceArchiveUrl) => {
   //eslint-disable-line
   return {

package/lib/compileFunctions.test.js

@@ -370,6 +370,64 @@ describe('CompileFunctions', () => {
       });
     });
 
+    it('should fail setting environment variable due to unsupported type (bool)', () => {
+      googlePackage.serverless.service.functions = {
+        func1: {
+          handler: 'func1',
+          environment: {
+            TEST_VAR: true,
+          },
+          events: [{ http: 'foo' }],
+        },
+      };
+
+      expect(() => googlePackage.compileFunctions()).toThrow(Error);
+    });
+
+    it('should fail setting environment variable due to unsupported type (null)', () => {
+      googlePackage.serverless.service.functions = {
+        func1: {
+          handler: 'func1',
+          environment: {
+            TEST_VAR: null,
+          },
+          events: [{ http: 'foo' }],
+        },
+      };
+
+      expect(() => googlePackage.compileFunctions()).toThrow(Error);
+    });
+
+    it('should fail setting environment variable due to unsupported type (object)', () => {
+      googlePackage.serverless.service.functions = {
+        func1: {
+          handler: 'func1',
+          environment: {
+            dev: {
+              TEST_VAR: 'test',
+            },
+          },
+          events: [{ http: 'foo' }],
+        },
+      };
+
+      expect(() => googlePackage.compileFunctions()).toThrow(Error);
+    });
+
+    it('should fail setting environment variable from provider due to unsupported type (bool)', () => {
+      googlePackage.serverless.service.functions = {
+        func1: {
+          handler: 'func1',
+          events: [{ http: 'foo' }],
+        },
+      };
+      googlePackage.serverless.service.provider.environment = {
+        TEST_VAR: true,
+      };
+
+      expect(() => googlePackage.compileFunctions()).toThrow(Error);
+    });
+
     it('should set the environment variables based on the function configuration', () => {
       googlePackage.serverless.service.functions = {
         func1: {
@@ -378,7 +436,6 @@ describe('CompileFunctions', () => {
             TEST_VAR: 'test',
             INT_VAR: 1,
             FLOAT_VAR: 3.141,
-            BOOL_VAR: true,
           },
           events: [{ http: 'foo' }],
         },
@@ -398,7 +455,6 @@ describe('CompileFunctions', () => {
               TEST_VAR: 'test',
               INT_VAR: '1',
               FLOAT_VAR: '3.141',
-              BOOL_VAR: 'true',
             },
             timeout: '60s',
             sourceArchiveUrl: 'gs://sls-my-service-dev-12345678/some-path/artifact.zip',
@@ -429,7 +485,6 @@ describe('CompileFunctions', () => {
         TEST_VAR: 'test',
         INT_VAR: 1,
         FLOAT_VAR: 3.141,
-        BOOL_VAR: true,
       };
 
       const compiledResources = [
@@ -446,7 +501,6 @@ describe('CompileFunctions', () => {
               TEST_VAR: 'test',
               INT_VAR: '1',
               FLOAT_VAR: '3.141',
-              BOOL_VAR: 'true',
             },
             timeout: '60s',
             sourceArchiveUrl: 'gs://sls-my-service-dev-12345678/some-path/artifact.zip',
@@ -473,15 +527,13 @@ describe('CompileFunctions', () => {
           environment: {
             TEST_VAR: 'test_var',
             TEST_VALUE: 'foobar',
-            TEST_BOOL: true,
           },
           events: [{ http: 'foo' }],
         },
       };
       googlePackage.serverless.service.provider.environment = {
         TEST_VAR: 'test',
         TEST_FOO: 'foo',
-        TEST_BOOL: false,
       };
 
       const compiledResources = [
@@ -498,7 +550,6 @@ describe('CompileFunctions', () => {
               TEST_VAR: 'test_var',
               TEST_VALUE: 'foobar',
               TEST_FOO: 'foo',
-              TEST_BOOL: 'true',
             },
             timeout: '60s',
             sourceArchiveUrl: 'gs://sls-my-service-dev-12345678/some-path/artifact.zip',
@@ -518,7 +569,6 @@ describe('CompileFunctions', () => {
         expect(googlePackage.serverless.service.provider.environment).toEqual({
           TEST_VAR: 'test',
           TEST_FOO: 'foo',
-          TEST_BOOL: false,
         });
       });
     });