1 files changed, 89 insertions, 0 deletions
diff --git a/packages/taler-wallet-core/src/util/logging.ts b/packages/taler-wallet-core/src/util/logging.ts
new file mode 100644
index 000000000..e4f3be2ff
--- /dev/null
+++ b/packages/taler-wallet-core/src/util/logging.ts
@@ -0,0 +1,89 @@
+/*
+ This file is part of TALER
+ (C) 2019 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Check if we are running under nodejs.
+ */
+
+const isNode =
+  typeof process !== "undefined" && process.release.name === "node";
+
+function writeNodeLog(
+  message: string,
+  tag: string,
+  level: string,
+  args: any[],
+): void {
+  process.stderr.write(`${new Date().toISOString()} ${tag} ${level} `);
+  process.stderr.write(message);
+  if (args.length != 0) {
+    process.stderr.write(" ");
+    process.stderr.write(JSON.stringify(args, undefined, 2));
+  }
+  process.stderr.write("\n");
+}
+
+/**
+ * Logger that writes to stderr when running under node,
+ * and uses the corresponding console.* method to log in the browser.
+ */
+export class Logger {
+  constructor(private tag: string) {}
+
+  info(message: string, ...args: any[]): void {
+    if (isNode) {
+      writeNodeLog(message, this.tag, "INFO", args);
+    } else {
+      console.info(
+        `${new Date().toISOString()} ${this.tag} INFO ` + message,
+        ...args,
+      );
+    }
+  }
+
+  warn(message: string, ...args: any[]): void {
+    if (isNode) {
+      writeNodeLog(message, this.tag, "WARN", args);
+    } else {
+      console.warn(
+        `${new Date().toISOString()} ${this.tag} INFO ` + message,
+        ...args,
+      );
+    }
+  }
+
+  error(message: string, ...args: any[]): void {
+    if (isNode) {
+      writeNodeLog(message, this.tag, "ERROR", args);
+    } else {
+      console.info(
+        `${new Date().toISOString()} ${this.tag} ERROR ` + message,
+        ...args,
+      );
+    }
+  }
+
+  trace(message: any, ...args: any[]): void {
+    if (isNode) {
+      writeNodeLog(message, this.tag, "TRACE", args);
+    } else {
+      console.info(
+        `${new Date().toISOString()} ${this.tag} TRACE ` + message,
+        ...args,
+      );
+    }
+  }
+}