move logger, pseudorandom, wrapper_interfaces to framework/utils/

contracts/integrations/test/framework/utils/logger.ts

@@ -0,0 +1,55 @@
+import { TxData } from 'ethereum-types';
+
+import { Pseudorandom } from '../utils/pseudorandom';
+
+// tslint:disable:no-console
+
+class Logger {
+    private _step = 0;
+
+    constructor() {
+        console.warn(
+            JSON.stringify({
+                level: 'info',
+                time: new Date(),
+                msg: `Pseudorandom seed: ${Pseudorandom.seed}`,
+            }),
+        );
+    }
+
+    /*
+     * Logs the name of the function executed, the arguments and transaction data it was
+     * called with, and the current step of the simulation.
+     */
+    public logFunctionAssertion(functionName: string, functionArgs: any[], txData: Partial<TxData>): void {
+        console.warn(
+            JSON.stringify({
+                level: 'info',
+                time: new Date(),
+                msg: `Function called: ${functionName}(${functionArgs
+                    .map(arg => JSON.stringify(arg).replace(/"/g, "'"))
+                    .join(', ')})`,
+                step: this._step++,
+                txData,
+            }),
+        );
+    }
+
+    /*
+     * Logs information about a assertion failure. Dumps the error thrown and arbitrary data from
+     * the calling context.
+     */
+    public logFailure(error: Error, data: string): void {
+        console.warn(
+            JSON.stringify({
+                level: 'error',
+                time: new Date(),
+                step: this._step,
+                error,
+                data,
+            }),
+        );
+    }
+}
+
+export const logger = new Logger();