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Add health checks to Node.js services (#26)

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* Move Node healthchecks to gRPC

* gitignore proto files

* Switch to standard health RPC

* Fix lint

* Update client.js

* Add protos back + update them

* node services: fix & run genproto.sh

this gets currencyservice to work but paymentservice is still crashing
in the docker container.

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

* Fix docker breaking

* update dockerfiles with released health probe

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>
This commit is contained in:
Ace Nassri 2018-09-19 12:35:22 -07:00 • committed by Ahmet Alp Balkan
parent 360d983512
commit 6c37a96f3a
18 changed files with 313 additions and 109 deletions
Download patch file Download diff file Expand all files Collapse all files

48
src/currencyservice/server.js
View file

@ -16,27 +16,49 @@
require('@google-cloud/profiler').start({
serviceContext: {
service: 'currencyservice',
version: '1.0.0'
service: 'currencyservice',
version: '1.0.0'
}
});
require('@google-cloud/trace-agent').start();
require('@google-cloud/debug-agent').start({
require('@google-cloud/trace-agent').start();
require('@google-cloud/debug-agent').start({
serviceContext: {
service: 'currencyservice',
version: 'VERSION'
}
})
});
const path = require('path');
const grpc = require('grpc');
const request = require('request');
const xml2js = require('xml2js');
const protoLoader = require('@grpc/proto-loader');
const MAIN_PROTO_PATH = path.join(__dirname, './proto/demo.proto');
const HEALTH_PROTO_PATH = path.join(__dirname, './proto/grpc/health/v1/health.proto');
const PROTO_PATH = path.join(__dirname, './proto/demo.proto');
const PORT = 7000;
const DATA_URL = 'http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml';
const shopProto = grpc.load(PROTO_PATH).hipstershop;
const shopProto = _loadProto(MAIN_PROTO_PATH).hipstershop;
const healthProto = _loadProto(HEALTH_PROTO_PATH).grpc.health.v1;
/**
* Helper function that loads a protobuf file.
*/
function _loadProto (path) {
const packageDefinition = protoLoader.loadSync(
path,
{
keepCase: true,
longs: String,
enums: String,
defaults: true,
oneofs: true
}
);
return grpc.loadPackageDefinition(packageDefinition);
}
/**
* Helper function that gets currency data from an XML webpage
@ -116,8 +138,8 @@ function convert (call, callback) {
nanos: euros.nanos * data[request.to_code]
});
result.units = Math.floor(result.units)
result.nanos = Math.floor(result.nanos)
result.units = Math.floor(result.units);
result.nanos = Math.floor(result.nanos);
result.currency_code = request.to_code;
console.log(`conversion request successful`);
@ -130,6 +152,13 @@ function convert (call, callback) {
}
}
/**
* Endpoint for health checks
*/
function check (call, callback) {
callback(null, { status: 'SERVING' });
}
/**
* Starts an RPC server that receives requests for the
* CurrencyConverter service at the sample server port
@ -138,6 +167,7 @@ function main () {
console.log(`Starting gRPC server on port ${PORT}...`);
const server = new grpc.Server();
server.addService(shopProto.CurrencyService.service, {getSupportedCurrencies, convert});
server.addService(healthProto.Health.service, {check});
server.bind(`0.0.0.0:${PORT}`, grpc.ServerCredentials.createInsecure());
server.start();
}