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discovery.go
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discovery.go
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/*
* MIT License
*
* Copyright (c) 2022-2024 Tochemey
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package cluster
import (
golog "log"
"strings"
"github.com/buraksezer/olric/pkg/service_discovery"
"github.com/pkg/errors"
"github.com/tochemey/goakt/discovery"
)
// discoveryProvider wraps the Cluster engine discovery and implements
// service_discovery.ServiceDiscovery
type discoveryProvider struct {
provider discovery.Provider
log *golog.Logger
}
// enforce compilation error
var _ service_discovery.ServiceDiscovery = &discoveryProvider{}
// Initialize implementation
func (d *discoveryProvider) Initialize() error {
// check whether the provider is set or not
if d.provider == nil {
return errors.New("discovery provider is not set")
}
// call the initialize method of the provider
if err := d.provider.Initialize(); err != nil {
if !errors.Is(err, discovery.ErrAlreadyInitialized) {
return err
}
}
return nil
}
// SetConfig implementation
func (d *discoveryProvider) SetConfig(c map[string]any) error {
// check whether the id is provided or not
id, ok := c["id"]
if !ok {
return errors.New("discovery provider id is not set")
}
// validate the id
idVal := id.(string)
if !strings.EqualFold(idVal, d.provider.ID()) {
return errors.New("invalid discovery provider id")
}
// let us extract the options
options, ok := c["options"]
if !ok {
return errors.New("discovery provider options is not set")
}
// let us cast the options to disco Meta
meta := options.(discovery.Config)
// call the underlying provider
if err := d.provider.SetConfig(meta); err != nil {
if !errors.Is(err, discovery.ErrAlreadyInitialized) {
return err
}
}
return nil
}
// SetLogger implementation
func (d *discoveryProvider) SetLogger(l *golog.Logger) {
d.log = l
}
// Register implementation
func (d *discoveryProvider) Register() error {
// check whether the provider is set or not
if d.provider == nil {
return errors.New("discovery provider is not set")
}
// call the provider register
if err := d.provider.Register(); err != nil {
if !errors.Is(err, discovery.ErrAlreadyRegistered) {
return err
}
}
return nil
}
// Deregister implementation
func (d *discoveryProvider) Deregister() error {
// check whether the provider is set or not
if d.provider == nil {
return errors.New("discovery provider is not set")
}
// call the provider de-register
return d.provider.Deregister()
}
// DiscoverPeers implementation
func (d *discoveryProvider) DiscoverPeers() ([]string, error) {
// check whether the provider is set or not
if d.provider == nil {
return nil, errors.New("discovery provider is not set")
}
// call the provider discover peers
return d.provider.DiscoverPeers()
}
// Close implementation
func (d *discoveryProvider) Close() error {
return d.provider.Close()
}