package tracing provides Dapper-style request tracing to services.
An implementation exists for Zipkin; Appdash support is planned.
Request tracing is a fundamental building block for large distributed applications. It's instrumental in understanding request flows, identifying hot spots, and diagnosing errors. All microservice infrastructures will benefit from request tracing; sufficiently large infrastructures will require it.
Wrap a server- or client-side endpoint so that it emits traces to a Zipkin collector.
func main() {
var (
myHost = "instance01.addsvc.internal.net"
myMethod = "ADD"
scribeHost = "scribe.internal.net"
timeout = 50 * time.Millisecond
batchSize = 100
batchInterval = 5 * time.Second
)
spanFunc := zipkin.NewSpanFunc(myHost, myMethod)
collector, _ := zipkin.NewScribeCollector(scribeHost, timeout, batchSize, batchInterval)
// Server-side
var server endpoint.Endpoint
server = makeEndpoint() // for your service
server = zipkin.AnnotateServer(spanFunc, collector)(server)
go serveViaHTTP(server)
// Client-side
before := httptransport.ClientBefore(zipkin.ToRequest(spanFunc))
var client endpoint.Endpoint
client = httptransport.NewClient(addr, codec, factory, before)
client = zipkin.AnnotateClient(spanFunc, collector)(client)
}