@creditkarma/zipkin-client-filter
v0.11.0-alpha.0
Published
Express server middleware for the Apache Thrift protocol
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Zipkin Client Filter
One of the problems that arise in microservice architectures is tracing the life of a request. Where do errors occur? Where are latencies? Just understanding all of the services a request touches can be non-trivial in complex systems.
This filter for @creditkarma/thrift-client helps to solve this problem by adding support for distributed tracing with Zipkin.
Installation
ZipkinClientFilter
has a few peerDependencies
.
npm install --save @creditkarma/thrift-server-core
npm install --save @creditkarma/thrift-client
npm install --save @creditkarma/thrift-zipkin-core
npm install --save @creditkarma/zipkin-client-filter
Usage
Zipkin tracing is added to your Thrift client through filters.
import {
createHttpClient,
} from '@creditkaram/thrift-client'
import {
ZipkinClientFilter,
} from '@creditkarma/zipkin-client-filter'
import { Calculator } from './codegen/calculator'
const thriftClient: Calculator.Client<ThriftContext<CoreOptions>> =
createHttpClient(Calculator.Client, {
hostName: 'localhost',
port: 8080,
register: [ ZipkinClientFilter({
localServiceName: 'calculator-client',
remoteServiceName: 'calculator-service',
tracerConfig: {
endpoint: 'http://localhost:9411/api/v1/spans',
sampleRate: 0.1,
}
}) ]
})
In order for tracing to be useful the services you are communicating with will also need to be setup with Zipkin tracing. Plugins are available for thrift-server-hapi
and thrift-server-express
. The provided plugins in Thrift Server only support HTTP transport at the moment.
Options
- localServiceName (required): The name of your service.
- remoteServiceName (optional): The name of the service you are calling.
- tracerConfig.debug (optional): In debug mode all requests are sampled.
- tracerConfig.endpoint (optional): URL of your collector (where to send traces).
- tracerConfig.sampleRate (optional): Percentage (from 0 to 1) of requests to sample. Defaults to 0.1.
- tracerConfig.httpInterval (optional): Sampling data is batched to reduce network load. This is the rate (in milliseconds) at which to empty the sample queue. Defaults to 1000.
If the endpoint is set then the plugin will send sampling data to the given endpoint over HTTP. If the endpoint is not set then sampling data will just be logged to the console.
Tracing Non-Thrift Endpoints
Sometimes, as part of completing your service request, you may need to gather data from both Thrift and non-Thrift endpoints. To get a complete picture you need to trace all of these calls. You can add Zipkin to other requests with instrumentation provided by the OpenZipkin project.
When constructing instrumentation provided by another library you need to use the same Tracer
in order to maintain the correct trace context. You can import this shared Tracer
through a call to getTracerForService
. This assumes a Tracer
has already been created for your service by usage of one of the Thrift Zipkin plugins.
import { getTracerForService } from '@creditkarma/thrift-server-core'
import * as wrapRequest from 'zipkin-instrumentation-request'
import * as request from 'request'
const tracer = getTracerForService('calculator-client')
const zipkinRequest = wrapRequest(request, { tracer, remoteServiceName: 'calculator-service' })
zipkinRequest.get(url, (err, resp, body) => {
// Do something
})
Contributing
For more information about contributing new features and bug fixes, see our Contribution Guidelines. External contributors must sign Contributor License Agreement (CLA)
License
This project is licensed under Apache License Version 2.0