Merge pull request #34 from hyperledger/configurable-log-level

Configurable log level

Author: gabriel-indik

lib/logger.ts

@@ -1,28 +1,56 @@
+enum logLevels {
+  LEVEL_NONE,
+  LEVEL_ERROR,
+  LEVEL_WARN,
+  LEVEL_LOG,
+  LEVEL_INFO,
+  LEVEL_DEBUG,
+  LEVEL_TRACE
+}
+
 export default class Logger {
-  constructor(private prefix: string) {}
+
+  private logLevel = logLevels.LEVEL_LOG;
+
+  constructor(private prefix: string) {
+    switch (process.env.FF_SDK_LOG_LEVEL) {
+      case 'NONE': this.logLevel = logLevels.LEVEL_NONE; break;
+      case 'ERROR': this.logLevel = logLevels.LEVEL_ERROR; break;
+      case 'WARN': this.logLevel = logLevels.LEVEL_WARN; break;
+      case 'LOG': this.logLevel = logLevels.LEVEL_LOG; break;
+      case 'INFO': this.logLevel = logLevels.LEVEL_INFO; break;
+      case 'DEBUG': this.logLevel = logLevels.LEVEL_DEBUG; break;
+      case 'TRACE': this.logLevel = logLevels.LEVEL_TRACE; break;
+    }
+  }
 
   private formatMessage(message: string) {
     const now = new Date().toISOString();
     return `${now} [${this.prefix}] ${message}`;
   }
 
-  log(message?: any, ...optionalParams: any[]): void {
-    console.log(this.formatMessage(message), ...optionalParams);
+  error(message?: any, ...optionalParams: any[]): void {
+    this.logLevel >= logLevels.LEVEL_ERROR && console.error(this.formatMessage(message), ...optionalParams);
   }
 
-  debug(message?: any, ...optionalParams: any[]): void {
-    console.debug(this.formatMessage(message), ...optionalParams);
+  warn(message?: any, ...optionalParams: any[]): void {
+    this.logLevel >= logLevels.LEVEL_WARN && console.warn(this.formatMessage(message), ...optionalParams);
   }
 
-  trace(message?: any, ...optionalParams: any[]): void {
-    console.trace(this.formatMessage(message), ...optionalParams);
+  log(message?: any, ...optionalParams: any[]): void {
+    this.logLevel >= logLevels.LEVEL_LOG && console.log(this.formatMessage(message), ...optionalParams);
   }
 
-  warn(message?: any, ...optionalParams: any[]): void {
-    console.warn(this.formatMessage(message), ...optionalParams);
+  info(message?: any, ...optionalParams: any[]): void {
+    this.logLevel >= logLevels.LEVEL_INFO && console.info(this.formatMessage(message), ...optionalParams);
   }
 
-  error(message?: any, ...optionalParams: any[]): void {
-    console.error(this.formatMessage(message), ...optionalParams);
+  debug(message?: any, ...optionalParams: any[]): void {
+    this.logLevel >= logLevels.LEVEL_DEBUG && console.debug(this.formatMessage(message), ...optionalParams);
   }
+
+  trace(message?: any, ...optionalParams: any[]): void {
+    this.logLevel >= logLevels.LEVEL_TRACE && console.trace(this.formatMessage(message), ...optionalParams);
+  }
+
 }