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client.go
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client.go
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// Copyright 2016-2019 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kvstore
import (
"fmt"
)
var (
// defaultClient is the default client initialized by initClient
defaultClient BackendOperations
// defaultClientSet is a channel that is closed whenever the defaultClient
// is set.
defaultClientSet = make(chan struct{})
)
func initClient(module backendModule, opts *ExtraOptions) error {
scopedLog := log.WithField(fieldKVStoreModule, module.getName())
c, errChan := module.newClient(opts)
if c == nil {
err := <-errChan
scopedLog.WithError(err).Fatal("Unable to create kvstore client")
}
defaultClient = c
select {
case <-defaultClientSet:
// avoid closing channel already closed.
default:
close(defaultClientSet)
}
go func() {
err, isErr := <-errChan
if isErr && err != nil {
scopedLog.WithError(err).Fatal("Unable to connect to kvstore")
}
deleteLegacyPrefixes()
}()
return nil
}
// Client returns the global kvstore client or nil if the client is not configured yet
func Client() BackendOperations {
<-defaultClientSet
return defaultClient
}
// NewClient returns a new kvstore client based on the configuration
func NewClient(selectedBackend string, opts map[string]string, options *ExtraOptions) (BackendOperations, chan error) {
// Channel used to report immediate errors, module.newClient will
// create and return a different channel, caller doesn't need to know
errChan := make(chan error, 1)
defer close(errChan)
module := getBackend(selectedBackend)
if module == nil {
errChan <- fmt.Errorf("unknown key-value store type %q. See cilium.link/err-kvstore for details", selectedBackend)
return nil, errChan
}
if err := module.setConfig(opts); err != nil {
errChan <- err
return nil, errChan
}
if err := module.setExtraConfig(options); err != nil {
errChan <- err
return nil, errChan
}
return module.newClient(options)
}