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discovery.go
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/
discovery.go
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package discovery
import (
"errors"
"fmt"
"net/url"
log "github.com/Sirupsen/logrus"
)
type Node struct {
url string
}
func NewNode(url string) *Node {
return &Node{url: url}
}
func (n Node) String() string {
return n.url
}
type WatchCallback func(nodes []*Node)
type DiscoveryService interface {
Initialize(string, int) error
Fetch() ([]*Node, error)
Watch(WatchCallback)
Register(string) error
}
var (
discoveries map[string]DiscoveryService
ErrNotSupported = errors.New("discovery service not supported")
ErrNotImplemented = errors.New("not implemented in this discovery service")
)
func init() {
discoveries = make(map[string]DiscoveryService)
}
func Register(scheme string, d DiscoveryService) error {
if _, exists := discoveries[scheme]; exists {
return fmt.Errorf("scheme already registered %s", scheme)
}
log.Debugf("Registering %q discovery service", scheme)
discoveries[scheme] = d
return nil
}
func New(rawurl string, heartbeat int) (DiscoveryService, error) {
url, err := url.Parse(rawurl)
if err != nil {
return nil, err
}
if discovery, exists := discoveries[url.Scheme]; exists {
log.Debugf("Initializing %q discovery service with %q", url.Scheme, url.Host+url.Path)
err := discovery.Initialize(url.Host+url.Path, heartbeat)
return discovery, err
}
return nil, ErrNotSupported
}