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@yurishkuro @peterbourgon
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// Package client provides a profilesvc client based on a predefined Consul
// service name and relevant tags. Users must only provide the address of a
// Consul server.
package client
import (
"io"
"time"
consulapi "github.com/hashicorp/consul/api"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/examples/profilesvc"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/sd"
"github.com/go-kit/kit/sd/consul"
"github.com/go-kit/kit/sd/lb"
)
// New returns a service that's load-balanced over instances of profilesvc found
// in the provided Consul server. The mechanism of looking up profilesvc
// instances in Consul is hard-coded into the client.
func New(consulAddr string, logger log.Logger) (profilesvc.Service, error) {
apiclient, err := consulapi.NewClient(&consulapi.Config{
Address: consulAddr,
})
if err != nil {
return nil, err
}
// As the implementer of profilesvc, we declare and enforce these
// parameters for all of the profilesvc consumers.
var (
consulService = "profilesvc"
consulTags = []string{"prod"}
passingOnly = true
retryMax = 3
retryTimeout = 500 * time.Millisecond
)
var (
sdclient = consul.NewClient(apiclient)
instancer = consul.NewInstancer(sdclient, logger, consulService, consulTags, passingOnly)
endpoints profilesvc.Endpoints
)
{
factory := factoryFor(profilesvc.MakePostProfileEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.PostProfileEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakeGetProfileEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.GetProfileEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakePutProfileEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.PutProfileEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakePatchProfileEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.PatchProfileEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakeDeleteProfileEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.DeleteProfileEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakeGetAddressesEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.GetAddressesEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakeGetAddressEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.GetAddressEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakePostAddressEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.PostAddressEndpoint = retry
}
{
factory := factoryFor(profilesvc.MakeDeleteAddressEndpoint)
endpointer := sd.NewEndpointer(instancer, factory, logger)
balancer := lb.NewRoundRobin(endpointer)
retry := lb.Retry(retryMax, retryTimeout, balancer)
endpoints.DeleteAddressEndpoint = retry
}
return endpoints, nil
}
func factoryFor(makeEndpoint func(profilesvc.Service) endpoint.Endpoint) sd.Factory {
return func(instance string) (endpoint.Endpoint, io.Closer, error) {
service, err := profilesvc.MakeClientEndpoints(instance)
if err != nil {
return nil, nil, err
}
return makeEndpoint(service), nil, nil
}
}
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