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/*
*
* Copyright 2016 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
'use strict';
var _ = require('lodash');
var grpc = require('../../..');
var proto = grpc.load(__dirname + '/../../proto/grpc/testing/metrics.proto');
var metrics = proto.grpc.testing;
function getGauge(call, callback) {
/* jshint validthis: true */
// Should be bound to a MetricsServer object
var name = call.request.name;
if (this.gauges.hasOwnProperty(name)) {
callback(null, _.assign({name: name}, this.gauges[name]()));
} else {
callback({code: grpc.status.NOT_FOUND,
details: 'No such gauge: ' + name});
}
}
function getAllGauges(call) {
/* jshint validthis: true */
// Should be bound to a MetricsServer object
_.each(this.gauges, function(getter, name) {
call.write(_.assign({name: name}, getter()));
});
call.end();
}
function MetricsServer(port) {
var server = new grpc.Server();
server.addService(metrics.MetricsService.service, {
getGauge: _.bind(getGauge, this),
getAllGauges: _.bind(getAllGauges, this)
});
server.bind('localhost:' + port, grpc.ServerCredentials.createInsecure());
this.server = server;
this.gauges = {};
}
MetricsServer.prototype.start = function() {
this.server.start();
}
MetricsServer.prototype.registerGauge = function(name, getter) {
this.gauges[name] = getter;
};
MetricsServer.prototype.shutdown = function() {
this.server.forceShutdown();
};
module.exports = MetricsServer;
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