Add logger builder

CHANGELOG.md

@@ -64,51 +64,51 @@ All notable changes to this project will be documented in this file. See [standa
 
 * add getCapabilities method to Search interface ([#42](https://github.com/awslabs/fhir-works-on-aws-interface/issues/42)) ([b274566](https://github.com/awslabs/fhir-works-on-aws-interface/commit/b274566c71899a2bd7c7d9112bfd85c889678ad4))
 
-## [6.0.1] - 2021-01-06
-
-### Updated
-* `GetSearchFilterBasedOnIdentityRequest.operation` now includes `history-instance`
-
-## [6.0.0] - 2020-12-21
-
-### Added
-- `SearchFilter` interface to allow `fhir-works-on-aws-search` to filter search results
-- `GetSearchFilterBasedOnIdentity` interface so `fhir-works-on-aws-authz` can provide `SearchFilter` that can be used for filtering search results
-- `InvalidSearchParameterError`: A new error for search to throw when search parameters are invalid
-
-## [5.0.0] - 2020-12-11
-
-### Added
-- `ProductInfo` interface to collect product and business information about the FHIR server
-
-## [4.0.0] - 2020-11-20
-
-### Added
-- `SmartStrategy` for passing in SMART Auth configurations
-- `SmartAuthorization` for class implementing SMART Auth 
-
-### Updated
-- Authorization interfaces to use `userIdentity` instead of `accessToken`
-- isAuthorized renamed to verifyAccessToken
-- getRequesterUserId method removed
-
-## [3.0.0] - 2020-11-11
-
-### Added
-- Required methods for SMART on FHIR interactions
-- Export UnauthorizedError to be usable
-- Required interfaces and types for bulk data export
-
-## [2.0.0] - 2020-09-25
-
-### Added
-- `getAllowedResourceTypesForOperation` method to `Authorization` interface.
-
-### Updated
-- `Authorization.isAuthorized` to return a promise.
-
-## [1.0.0] - 2020-08-31
-
-### Added
-
-- Initial launch! :rocket:
+## [6.0.1] - 2021-01-06
+
+### Updated
+* `GetSearchFilterBasedOnIdentityRequest.operation` now includes `history-instance`
+
+## [6.0.0] - 2020-12-21
+
+### Added
+- `SearchFilter` interface to allow `fhir-works-on-aws-search` to filter search results
+- `GetSearchFilterBasedOnIdentity` interface so `fhir-works-on-aws-authz` can provide `SearchFilter` that can be used for filtering search results
+- `InvalidSearchParameterError`: A new error for search to throw when search parameters are invalid
+
+## [5.0.0] - 2020-12-11
+
+### Added
+- `ProductInfo` interface to collect product and business information about the FHIR server
+
+## [4.0.0] - 2020-11-20
+
+### Added
+- `SmartStrategy` for passing in SMART Auth configurations
+- `SmartAuthorization` for class implementing SMART Auth 
+
+### Updated
+- Authorization interfaces to use `userIdentity` instead of `accessToken`
+- isAuthorized renamed to verifyAccessToken
+- getRequesterUserId method removed
+
+## [3.0.0] - 2020-11-11
+
+### Added
+- Required methods for SMART on FHIR interactions
+- Export UnauthorizedError to be usable
+- Required interfaces and types for bulk data export
+
+## [2.0.0] - 2020-09-25
+
+### Added
+- `getAllowedResourceTypesForOperation` method to `Authorization` interface.
+
+### Updated
+- `Authorization.isAuthorized` to return a promise.
+
+## [1.0.0] - 2020-08-31
+
+### Added
+
+- Initial launch! :rocket:

package.json

@@ -27,7 +27,10 @@
     "local": "node .",
     "prepublish": "tsc"
   },
-  "dependencies": {},
+  "dependencies": {
+    "winston": "^3.3.3",
+    "winston-transport": "^4.4.0"
+  },
   "devDependencies": {
     "@types/jest": "^26.0.19",
     "@types/node": "^12",

src/fhirConfig.ts

@@ -82,10 +82,6 @@ export interface Server {
     url: string;
 }
 
-export interface Logging {
-    level: 'debug' | 'info' | 'warn' | 'error';
-}
-
 export interface Resource {
     operations: TypeOperation[];
     fhirVersions: FhirVersion[];
@@ -160,7 +156,6 @@ export interface FhirConfig {
     productInfo: ProductInfo;
     auth: Auth;
     server: Server;
-    logging: Logging;
     profile: Profile;
     validators: Validator[];
 }

src/index.ts

@@ -23,4 +23,5 @@ export * from './errors/UnauthorizedError';
 export * from './errors/TooManyConcurrentExportRequestsError';
 export * from './errors/InvalidSearchParameterError';
 export * from './validator';
+export { makeLogger } from './loggerBuilder';
 export { stubs } from './stubs';

src/loggerBuilder.ts

@@ -0,0 +1,46 @@
+import { createLogger, Logger } from 'winston';
+import Transport from 'winston-transport';
+
+class SimpleConsole extends Transport {
+    log(info: any, callback: () => void) {
+        setImmediate(() => this.emit('logged', info));
+        const msg = [info.meta, info.message];
+        if (info[Symbol.for('splat')]) {
+            msg.push(...info[Symbol.for('splat')]);
+        }
+
+        // Use console here so request ID and log level can be automatically attached in CloudWatch log
+        /* eslint-disable no-console */
+        switch (info[Symbol.for('level')]) {
+            case 'debug':
+                console.debug(...msg);
+                break;
+            case 'info':
+                console.info(...msg);
+                break;
+            case 'warn':
+                console.warn(...msg);
+                break;
+            case 'error':
+                console.error(...msg);
+                break;
+            default:
+                console.log(...msg);
+                break;
+        }
+        /* eslint-enable no-console */
+
+        if (callback) {
+            callback();
+        }
+    }
+}
+
+// eslint-disable-next-line import/prefer-default-export
+export function makeLogger(metadata?: any, logLevel: string | undefined = process.env.LOG_LEVEL): Logger {
+    return createLogger({
+        level: logLevel,
+        transports: [new SimpleConsole()],
+        defaultMeta: { meta: metadata },
+    });
+}