micro/network/router/service/service.go

238 lines
4.8 KiB
Go

package service
import (
"context"
"errors"
"sync"
"github.com/google/uuid"
"github.com/micro/go-micro/client"
"github.com/micro/go-micro/network/router"
pb "github.com/micro/go-micro/network/router/proto"
)
var (
// ErrNotImplemented means the functionality has not been implemented
ErrNotImplemented = errors.New("not implemented")
)
type svc struct {
opts router.Options
router pb.RouterService
status router.Status
watchers map[string]*svcWatcher
sync.RWMutex
}
// NewRouter creates new service router and returns it
func NewRouter(opts ...router.Option) router.Router {
// get default options
options := router.DefaultOptions()
// apply requested options
for _, o := range opts {
o(&options)
}
// NOTE: might need some client opts here
client := client.DefaultClient
// NOTE: should we have Client/Service option in router.Options?
s := &svc{
opts: options,
router: pb.NewRouterService(router.DefaultName, client),
status: router.Status{Code: router.Stopped, Error: nil},
watchers: make(map[string]*svcWatcher),
}
return s
}
// Init initializes router with given options
func (s *svc) Init(opts ...router.Option) error {
for _, o := range opts {
o(&s.opts)
}
return nil
}
// Options returns router options
func (s *svc) Options() router.Options {
return s.opts
}
// Run runs the router.
// It returns error if the router is already running.
func (s *svc) run() {
s.Lock()
defer s.Unlock()
switch s.status.Code {
case router.Stopped, router.Error:
// TODO: start event stream watcher
// TODO: start watchError monitor
}
}
// Advertise advertises routes to the network
func (s *svc) Advertise() (<-chan *router.Advert, error) {
// TODO: start advert stream watcher
return nil, nil
}
// Process processes incoming adverts
func (s *svc) Process(a *router.Advert) error {
return nil
}
// Create new route in the routing table
func (s *svc) Create(r router.Route) error {
route := &pb.Route{
Service: r.Service,
Address: r.Address,
Gateway: r.Gateway,
Network: r.Network,
Link: r.Link,
Metric: int64(r.Metric),
}
if _, err := s.router.Create(context.Background(), route); err != nil {
return err
}
return nil
}
// Delete deletes existing route from the routing table
func (s *svc) Delete(r router.Route) error {
route := &pb.Route{
Service: r.Service,
Address: r.Address,
Gateway: r.Gateway,
Network: r.Network,
Link: r.Link,
Metric: int64(r.Metric),
}
if _, err := s.router.Delete(context.Background(), route); err != nil {
return err
}
return nil
}
// Update updates route in the routing table
func (s *svc) Update(r router.Route) error {
route := &pb.Route{
Service: r.Service,
Address: r.Address,
Gateway: r.Gateway,
Network: r.Network,
Link: r.Link,
Metric: int64(r.Metric),
}
if _, err := s.router.Update(context.Background(), route); err != nil {
return err
}
return nil
}
// List returns the list of all routes in the table
func (s *svc) List() ([]router.Route, error) {
resp, err := s.router.List(context.Background(), &pb.ListRequest{})
if err != nil {
return nil, err
}
routes := make([]router.Route, len(resp.Routes))
for i, route := range resp.Routes {
routes[i] = router.Route{
Service: route.Service,
Address: route.Address,
Gateway: route.Gateway,
Network: route.Network,
Link: route.Link,
Metric: int(route.Metric),
}
}
return routes, nil
}
// Lookup looks up routes in the routing table and returns them
func (s *svc) Lookup(q router.Query) ([]router.Route, error) {
// call the router
resp, err := s.router.Lookup(context.Background(), &pb.LookupRequest{
Query: &pb.Query{
Service: q.Options().Service,
Gateway: q.Options().Gateway,
Network: q.Options().Network,
},
})
// errored out
if err != nil {
return nil, err
}
routes := make([]router.Route, len(resp.Routes))
for i, route := range resp.Routes {
routes[i] = router.Route{
Service: route.Service,
Address: route.Address,
Gateway: route.Gateway,
Network: route.Network,
Link: route.Link,
Metric: int(route.Metric),
}
}
return routes, nil
}
// Watch returns a watcher which allows to track updates to the routing table
func (s *svc) Watch(opts ...router.WatchOption) (router.Watcher, error) {
wopts := router.WatchOptions{
Service: "*",
}
for _, o := range opts {
o(&wopts)
}
w := &svcWatcher{
opts: wopts,
resChan: make(chan *router.Event, 10),
done: make(chan struct{}),
}
s.Lock()
s.watchers[uuid.New().String()] = w
s.Unlock()
return w, nil
}
// Status returns router status
func (s *svc) Status() router.Status {
s.RLock()
defer s.RUnlock()
// make a copy of the status
status := s.status
return status
}
// Stop stops the router
func (s *svc) Stop() error {
return nil
}
// Returns the router implementation
func (s *svc) String() string {
return "service"
}