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service.go
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service.go
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// Copyright 2017 Microsoft. All rights reserved.
// MIT License
package cns
import (
"net/http"
"net/url"
"github.com/Azure/azure-container-networking/cns/common"
acn "github.com/Azure/azure-container-networking/common"
"github.com/Azure/azure-container-networking/log"
"github.com/Azure/azure-container-networking/store"
)
const (
// Default CNS server URL.
defaultAPIServerURL = "tcp://localhost:10090"
genericData = "com.microsoft.azure.network.generic"
)
// Service defines Container Networking Service.
type Service struct {
*common.Service
EndpointType string
Listener *acn.Listener
}
// NewService creates a new Service object.
func NewService(name, version string, store store.KeyValueStore) (*Service, error) {
service, err := common.NewService(name, version, store)
if err != nil {
return nil, err
}
return &Service{
Service: service,
}, nil
}
// GetAPIServerURL returns the API server URL.
func (service *Service) getAPIServerURL() string {
urls, _ := service.GetOption(acn.OptCnsURL).(string)
if urls == "" {
urls = defaultAPIServerURL
}
return urls
}
// Initialize initializes the service and starts the listener.
func (service *Service) Initialize(config *common.ServiceConfig) error {
log.Debugf("[Azure CNS] Going to initialize a service with config: %+v", config)
// Initialize the base service.
service.Service.Initialize(config)
// Initialize the listener.
if config.Listener == nil {
// Fetch and parse the API server URL.
u, err := url.Parse(service.getAPIServerURL())
if err != nil {
return err
}
// Create the listener.
listener, err := acn.NewListener(u)
if err != nil {
return err
}
// Start the listener.
err = listener.Start(config.ErrChan)
if err != nil {
return err
}
config.Listener = listener
}
service.Listener = config.Listener
log.Debugf("[Azure CNS] Successfully initialized a service with config: %+v", config)
return nil
}
// Uninitialize cleans up the plugin.
func (service *Service) Uninitialize() {
service.Listener.Stop()
service.Service.Uninitialize()
}
// ParseOptions returns generic options from a libnetwork request.
func (service *Service) ParseOptions(options OptionMap) OptionMap {
opt, _ := options[genericData].(OptionMap)
return opt
}
// SendErrorResponse sends and logs an error response.
func (service *Service) SendErrorResponse(w http.ResponseWriter, errMsg error) {
resp := errorResponse{errMsg.Error()}
err := service.Listener.Encode(w, &resp)
log.Errorf("[%s] %+v %s.", service.Name, &resp, err.Error())
}