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var assert = require('assert');
var client = require('../surface_client.js');
var ProtoBuf = require('protobufjs');
var port_picker = require('../port_picker');
var builder = ProtoBuf.loadProtoFile(__dirname + '/../examples/math.proto');
var math = builder.build('math');
/**
* Get a function that deserializes a specific type of protobuf.
* @param {function()} cls The constructor of the message type to deserialize
* @return {function(Buffer):cls} The deserialization function
*/
function deserializeCls(cls) {
/**
* Deserialize a buffer to a message object
* @param {Buffer} arg_buf The buffer to deserialize
* @return {cls} The resulting object
*/
return function deserialize(arg_buf) {
return cls.decode(arg_buf);
};
}
/**
* Serialize an object to a buffer
* @param {*} arg The object to serialize
* @return {Buffer} The serialized object
*/
function serialize(arg) {
return new Buffer(arg.encode().toBuffer());
}
/**
* Sends a Div request on the channel.
* @param {client.Channel} channel The channel on which to make the request
* @param {DivArg} argument The argument to the call. Should be serializable
* with serialize
* @param {function(?Error, value=)} The callback to for when the response is
* received
* @param {array=} Array of metadata key/value pairs to add to the call
* @param {(number|Date)=} deadline The deadline for processing this request.
* Defaults to infinite future
* @return {EventEmitter} An event emitter for stream related events
*/
var div = client.makeUnaryRequestFunction(
'/Math/Div',
serialize,
deserializeCls(math.DivReply));
/**
* Sends a Fib request on the channel.
* @param {client.Channel} channel The channel on which to make the request
* @param {*} argument The argument to the call. Should be serializable with
* serialize
* @param {array=} Array of metadata key/value pairs to add to the call
* @param {(number|Date)=} deadline The deadline for processing this request.
* Defaults to infinite future
* @return {EventEmitter} An event emitter for stream related events
*/
var fib = client.makeServerStreamRequestFunction(
'/Math/Fib',
serialize,
deserializeCls(math.Num));
/**
* Sends a Sum request on the channel.
* @param {client.Channel} channel The channel on which to make the request
* @param {function(?Error, value=)} The callback to for when the response is
* received
* @param {array=} Array of metadata key/value pairs to add to the call
* @param {(number|Date)=} deadline The deadline for processing this request.
* Defaults to infinite future
* @return {EventEmitter} An event emitter for stream related events
*/
var sum = client.makeClientStreamRequestFunction(
'/Math/Sum',
serialize,
deserializeCls(math.Num));
/**
* Sends a DivMany request on the channel.
* @param {client.Channel} channel The channel on which to make the request
* @param {array=} Array of metadata key/value pairs to add to the call
* @param {(number|Date)=} deadline The deadline for processing this request.
* Defaults to infinite future
* @return {EventEmitter} An event emitter for stream related events
*/
var divMany = client.makeBidiStreamRequestFunction(
'/Math/DivMany',
serialize,
deserializeCls(math.DivReply));
/**
* Channel to use to make requests to a running server.
*/
var channel;
/**
* Server to test against
*/
var server = require('../examples/math_server.js');
describe('Math client', function() {
before(function(done) {
port_picker.nextAvailablePort(function(port) {
server.bind(port).listen();
channel = new client.Channel(port);
done();
});
});
after(function() {
server.shutdown();
});
it('should handle a single request', function(done) {
var arg = new math.DivArgs({dividend: 7, divisor: 4});
var call = div(channel, arg, function handleDivResult(err, value) {
assert.ifError(err);
assert.equal(value.get('quotient'), 1);
assert.equal(value.get('remainder'), 3);
});
call.on('status', function checkStatus(status) {
assert.strictEqual(status.code, client.status.OK);
done();
});
});
it('should handle a server streaming request', function(done) {
var arg = new math.FibArgs({limit: 7});
var call = fib(channel, arg);
var expected_results = [1, 1, 2, 3, 5, 8, 13];
var next_expected = 0;
call.on('data', function checkResponse(value) {
assert.equal(value.get('num'), expected_results[next_expected]);
next_expected += 1;
});
call.on('status', function checkStatus(status) {
assert.strictEqual(status.code, client.status.OK);
done();
});
});
it('should handle a client streaming request', function(done) {
var call = sum(channel, function handleSumResult(err, value) {
assert.ifError(err);
assert.equal(value.get('num'), 21);
});
for (var i = 0; i < 7; i++) {
call.write(new math.Num({'num': i}));
}
call.end();
call.on('status', function checkStatus(status) {
assert.strictEqual(status.code, client.status.OK);
done();
});
});
it('should handle a bidirectional streaming request', function(done) {
function checkResponse(index, value) {
assert.equal(value.get('quotient'), index);
assert.equal(value.get('remainder'), 1);
}
var call = divMany(channel);
var response_index = 0;
call.on('data', function(value) {
checkResponse(response_index, value);
response_index += 1;
});
for (var i = 0; i < 7; i++) {
call.write(new math.DivArgs({dividend: 2 * i + 1, divisor: 2}));
}
call.end();
call.on('status', function checkStatus(status) {
assert.strictEqual(status.code, client.status.OK);
done();
});
});
});
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