Pass validation errors with InvalidMessage error

Pass the array describing the validation errors occuring with the
InvalidMessage error throw and print it to the console.

lib/errors.js

@@ -7,7 +7,12 @@ class CommandError extends Error { }
 class RequestError extends Error { }
 
 // Signal for messages that fail validation
-class InvalidMessage extends Error { }
+class InvalidMessage extends Error {
+	constructor(msg, errors) {
+		super(msg);
+		this.errors = errors || null;
+	}
+}
 
 // Errror class for known errors occuring during startup
 class StartupError extends Error { }

lib/link/link.js

@@ -33,6 +33,10 @@ class Link {
 			} catch (err) {
 				if (err instanceof errors.InvalidMessage) {
 					this.connector.close(`Invalid message: ${err.message}`);
+					console.error(`Invalid message on ${this.source}-${this.target} link: ${err.message}`)
+					if (err.errors) {
+						console.error(err.errors);
+					}
 				} else {
 					this.connector.emit('error', err);
 				}
@@ -57,7 +61,7 @@ class Link {
 	 */
 	processMessage(message) {
 		if (!schema.message(message)) {
-			throw new errors.InvalidMessage("Malformed");
+			throw new errors.InvalidMessage("Malformed", schema.message.errors);
 		}
 
 		let validator = this._validators.get(message.type);
@@ -66,9 +70,7 @@ class Link {
 		}
 
 		if (!validator(message)) {
-			// TODO better logging of errors encountered validating
-			console.error(validator.errors);
-			throw new errors.InvalidMessage(`Validation failed for ${message.type}`);
+			throw new errors.InvalidMessage(`Validation failed for ${message.type}`, validator.errors);
 		}
 
 		let hadHandlers = this._processHandler(message);

test/lib/link/link.js

@@ -90,7 +90,7 @@ describe("lib/link/link", function() {
 			it("should throw on invalid message", function() {
 				assert.throws(
 					() => testLink.processMessage({ data: "invalid message" }),
-					new errors.InvalidMessage("Malformed")
+					{ message: "Malformed" }
 				);
 			});
 			it("should throw on message without validator", function() {
@@ -102,7 +102,7 @@ describe("lib/link/link", function() {
 			it("should throw on message failing validation", function() {
 				assert.throws(
 					() => testLink.processMessage({ seq: 1, type: 'simple', data: { string: 1 }}),
-					new errors.InvalidMessage("Validation failed for simple")
+					{ message: "Validation failed for simple" }
 				);
 			});
 			it("should throw on unhandled message", function() {