Create Printer Health Check

client/printing/print_client.js

@@ -3,6 +3,22 @@ const fs = require('fs');
 const messages = require('./print_pb');
 const services = require('./print_grpc_pb');
 
+function healthCheck() {
+ const client = new services.PrinterClient(
+ 'localhost:50051', grpc.credentials.createInsecure()
+ );
+ const healthCheckRequest = new messages.PrintRequest();
+ return new Promise(function(resolve, reject) {
+ client.healthCheck(healthCheckRequest, function(err, response) {
+ if (err || !response) {
+ reject({ message: 'Printer is down', error: true });
+ } else {
+ resolve({ message: response, error: false });
+ }
+ });
+ });
+}
+
 function sendPrintRequest(raw, copies, sides, pageRanges, destination) {
  printOptions = {
  'sides': sides,
@@ -30,4 +46,4 @@ function sendPrintRequest(raw, copies, sides, pageRanges, destination) {
  });
 }
 
-module.exports = { sendPrintRequest };
+module.exports = { sendPrintRequest, healthCheck };

client/printing/print_grpc_pb.js

@@ -4,6 +4,17 @@
 var grpc = require('grpc');
 var print_pb = require('./print_pb.js');
 
+function serialize_HealthCheckUpRequest(arg) {
+ if (!(arg instanceof print_pb.HealthCheckUpRequest)) {
+ throw new Error('Expected argument of type HealthCheckUpRequest');
+ }
+ return Buffer.from(arg.serializeBinary());
+}
+
+function deserialize_HealthCheckUpRequest(buffer_arg) {
+ return print_pb.HealthCheckUpRequest.deserializeBinary(new Uint8Array(buffer_arg));
+}
+
 function serialize_PrintRequest(arg) {
  if (!(arg instanceof print_pb.PrintRequest)) {
  throw new Error('Expected argument of type PrintRequest');
@@ -26,6 +37,17 @@ function deserialize_PrintResponse(buffer_arg) {
  return print_pb.PrintResponse.deserializeBinary(new Uint8Array(buffer_arg));
 }
 
+function serialize_PrinterHealthStatus(arg) {
+ if (!(arg instanceof print_pb.PrinterHealthStatus)) {
+ throw new Error('Expected argument of type PrinterHealthStatus');
+ }
+ return Buffer.from(arg.serializeBinary());
+}
+
+function deserialize_PrinterHealthStatus(buffer_arg) {
+ return print_pb.PrinterHealthStatus.deserializeBinary(new Uint8Array(buffer_arg));
+}
+
 
 var PrinterService = exports.PrinterService = {
  printPage: {
@@ -39,6 +61,17 @@ var PrinterService = exports.PrinterService = {
  responseSerialize: serialize_PrintResponse,
  responseDeserialize: deserialize_PrintResponse,
  },
+ healthCheck: {
+ path: '/Printer/HealthCheck',
+ requestStream: false,
+ responseStream: false,
+ requestType: print_pb.HealthCheckUpRequest,
+ responseType: print_pb.PrinterHealthStatus,
+ requestSerialize: serialize_HealthCheckUpRequest,
+ requestDeserialize: deserialize_HealthCheckUpRequest,
+ responseSerialize: serialize_PrinterHealthStatus,
+ responseDeserialize: deserialize_PrinterHealthStatus,
+ },
 };
 
 exports.PrinterClient = grpc.makeGenericClientConstructor(PrinterService);

client/printing/print_pb.js

@@ -11,8 +11,10 @@ var jspb = require('google-protobuf');
 var goog = jspb;
 var global = Function('return this')();
 
+goog.exportSymbol('proto.HealthCheckUpRequest', null, global);
 goog.exportSymbol('proto.PrintRequest', null, global);
 goog.exportSymbol('proto.PrintResponse', null, global);
+goog.exportSymbol('proto.PrinterHealthStatus', null, global);
 
 /**
  * Generated by JsPbCodeGenerator.
@@ -404,4 +406,288 @@ proto.PrintResponse.prototype.setMessage = function(value) {
 };
 
 
+
+/**
+ * Generated by JsPbCodeGenerator.
+ * @param {Array=} opt_data Optional initial data array, typically from a
+ * server response, or constructed directly in Javascript. The array is used
+ * in place and becomes part of the constructed object. It is not cloned.
+ * If no data is provided, the constructed object will be empty, but still
+ * valid.
+ * @extends {jspb.Message}
+ * @constructor
+ */
+proto.HealthCheckUpRequest = function(opt_data) {
+ jspb.Message.initialize(this, opt_data, 0, -1, null, null);
+};
+goog.inherits(proto.HealthCheckUpRequest, jspb.Message);
+if (goog.DEBUG && !COMPILED) {
+ proto.HealthCheckUpRequest.displayName = 'proto.HealthCheckUpRequest';
+}
+
+
+if (jspb.Message.GENERATE_TO_OBJECT) {
+/**
+ * Creates an object representation of this proto suitable for use in Soy templates.
+ * Field names that are reserved in JavaScript and will be renamed to pb_name.
+ * To access a reserved field use, foo.pb_<name>, eg, foo.pb_default.
+ * For the list of reserved names please see:
+ * com.google.apps.jspb.JsClassTemplate.JS_RESERVED_WORDS.
+ * @param {boolean=} opt_includeInstance Whether to include the JSPB instance
+ * for transitional soy proto support: http://goto/soy-param-migration
+ * @return {!Object}
+ */
+proto.HealthCheckUpRequest.prototype.toObject = function(opt_includeInstance) {
+ return proto.HealthCheckUpRequest.toObject(opt_includeInstance, this);
+};
+
+
+/**
+ * Static version of the {@see toObject} method.
+ * @param {boolean|undefined} includeInstance Whether to include the JSPB
+ * instance for transitional soy proto support:
+ * http://goto/soy-param-migration
+ * @param {!proto.HealthCheckUpRequest} msg The msg instance to transform.
+ * @return {!Object}
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.HealthCheckUpRequest.toObject = function(includeInstance, msg) {
+ var f, obj = {
+ memberName: jspb.Message.getFieldWithDefault(msg, 1, "")
+ };
+
+ if (includeInstance) {
+ obj.$jspbMessageInstance = msg;
+ }
+ return obj;
+};
+}
+
+
+/**
+ * Deserializes binary data (in protobuf wire format).
+ * @param {jspb.ByteSource} bytes The bytes to deserialize.
+ * @return {!proto.HealthCheckUpRequest}
+ */
+proto.HealthCheckUpRequest.deserializeBinary = function(bytes) {
+ var reader = new jspb.BinaryReader(bytes);
+ var msg = new proto.HealthCheckUpRequest;
+ return proto.HealthCheckUpRequest.deserializeBinaryFromReader(msg, reader);
+};
+
+
+/**
+ * Deserializes binary data (in protobuf wire format) from the
+ * given reader into the given message object.
+ * @param {!proto.HealthCheckUpRequest} msg The message object to deserialize into.
+ * @param {!jspb.BinaryReader} reader The BinaryReader to use.
+ * @return {!proto.HealthCheckUpRequest}
+ */
+proto.HealthCheckUpRequest.deserializeBinaryFromReader = function(msg, reader) {
+ while (reader.nextField()) {
+ if (reader.isEndGroup()) {
+ break;
+ }
+ var field = reader.getFieldNumber();
+ switch (field) {
+ case 1:
+ var value = /** @type {string} */ (reader.readString());
+ msg.setMemberName(value);
+ break;
+ default:
+ reader.skipField();
+ break;
+ }
+ }
+ return msg;
+};
+
+
+/**
+ * Serializes the message to binary data (in protobuf wire format).
+ * @return {!Uint8Array}
+ */
+proto.HealthCheckUpRequest.prototype.serializeBinary = function() {
+ var writer = new jspb.BinaryWriter();
+ proto.HealthCheckUpRequest.serializeBinaryToWriter(this, writer);
+ return writer.getResultBuffer();
+};
+
+
+/**
+ * Serializes the given message to binary data (in protobuf wire
+ * format), writing to the given BinaryWriter.
+ * @param {!proto.HealthCheckUpRequest} message
+ * @param {!jspb.BinaryWriter} writer
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.HealthCheckUpRequest.serializeBinaryToWriter = function(message, writer) {
+ var f = undefined;
+ f = message.getMemberName();
+ if (f.length > 0) {
+ writer.writeString(
+ 1,
+ f
+ );
+ }
+};
+
+
+/**
+ * optional string member_name = 1;
+ * @return {string}
+ */
+proto.HealthCheckUpRequest.prototype.getMemberName = function() {
+ return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 1, ""));
+};
+
+
+/** @param {string} value */
+proto.HealthCheckUpRequest.prototype.setMemberName = function(value) {
+ jspb.Message.setProto3StringField(this, 1, value);
+};
+
+
+
+/**
+ * Generated by JsPbCodeGenerator.
+ * @param {Array=} opt_data Optional initial data array, typically from a
+ * server response, or constructed directly in Javascript. The array is used
+ * in place and becomes part of the constructed object. It is not cloned.
+ * If no data is provided, the constructed object will be empty, but still
+ * valid.
+ * @extends {jspb.Message}
+ * @constructor
+ */
+proto.PrinterHealthStatus = function(opt_data) {
+ jspb.Message.initialize(this, opt_data, 0, -1, null, null);
+};
+goog.inherits(proto.PrinterHealthStatus, jspb.Message);
+if (goog.DEBUG && !COMPILED) {
+ proto.PrinterHealthStatus.displayName = 'proto.PrinterHealthStatus';
+}
+
+
+if (jspb.Message.GENERATE_TO_OBJECT) {
+/**
+ * Creates an object representation of this proto suitable for use in Soy templates.
+ * Field names that are reserved in JavaScript and will be renamed to pb_name.
+ * To access a reserved field use, foo.pb_<name>, eg, foo.pb_default.
+ * For the list of reserved names please see:
+ * com.google.apps.jspb.JsClassTemplate.JS_RESERVED_WORDS.
+ * @param {boolean=} opt_includeInstance Whether to include the JSPB instance
+ * for transitional soy proto support: http://goto/soy-param-migration
+ * @return {!Object}
+ */
+proto.PrinterHealthStatus.prototype.toObject = function(opt_includeInstance) {
+ return proto.PrinterHealthStatus.toObject(opt_includeInstance, this);
+};
+
+
+/**
+ * Static version of the {@see toObject} method.
+ * @param {boolean|undefined} includeInstance Whether to include the JSPB
+ * instance for transitional soy proto support:
+ * http://goto/soy-param-migration
+ * @param {!proto.PrinterHealthStatus} msg The msg instance to transform.
+ * @return {!Object}
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.PrinterHealthStatus.toObject = function(includeInstance, msg) {
+ var f, obj = {
+ message: jspb.Message.getFieldWithDefault(msg, 1, "")
+ };
+
+ if (includeInstance) {
+ obj.$jspbMessageInstance = msg;
+ }
+ return obj;
+};
+}
+
+
+/**
+ * Deserializes binary data (in protobuf wire format).
+ * @param {jspb.ByteSource} bytes The bytes to deserialize.
+ * @return {!proto.PrinterHealthStatus}
+ */
+proto.PrinterHealthStatus.deserializeBinary = function(bytes) {
+ var reader = new jspb.BinaryReader(bytes);
+ var msg = new proto.PrinterHealthStatus;
+ return proto.PrinterHealthStatus.deserializeBinaryFromReader(msg, reader);
+};
+
+
+/**
+ * Deserializes binary data (in protobuf wire format) from the
+ * given reader into the given message object.
+ * @param {!proto.PrinterHealthStatus} msg The message object to deserialize into.
+ * @param {!jspb.BinaryReader} reader The BinaryReader to use.
+ * @return {!proto.PrinterHealthStatus}
+ */
+proto.PrinterHealthStatus.deserializeBinaryFromReader = function(msg, reader) {
+ while (reader.nextField()) {
+ if (reader.isEndGroup()) {
+ break;
+ }
+ var field = reader.getFieldNumber();
+ switch (field) {
+ case 1:
+ var value = /** @type {string} */ (reader.readString());
+ msg.setMessage(value);
+ break;
+ default:
+ reader.skipField();
+ break;
+ }
+ }
+ return msg;
+};
+
+
+/**
+ * Serializes the message to binary data (in protobuf wire format).
+ * @return {!Uint8Array}
+ */
+proto.PrinterHealthStatus.prototype.serializeBinary = function() {
+ var writer = new jspb.BinaryWriter();
+ proto.PrinterHealthStatus.serializeBinaryToWriter(this, writer);
+ return writer.getResultBuffer();
+};
+
+
+/**
+ * Serializes the given message to binary data (in protobuf wire
+ * format), writing to the given BinaryWriter.
+ * @param {!proto.PrinterHealthStatus} message
+ * @param {!jspb.BinaryWriter} writer
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.PrinterHealthStatus.serializeBinaryToWriter = function(message, writer) {
+ var f = undefined;
+ f = message.getMessage();
+ if (f.length > 0) {
+ writer.writeString(
+ 1,
+ f
+ );
+ }
+};
+
+
+/**
+ * optional string message = 1;
+ * @return {string}
+ */
+proto.PrinterHealthStatus.prototype.getMessage = function() {
+ return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 1, ""));
+};
+
+
+/** @param {string} value */
+proto.PrinterHealthStatus.prototype.setMessage = function(value) {
+ jspb.Message.setProto3StringField(this, 1, value);
+};
+
+
 goog.object.extend(exports, proto);