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clients.go
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clients.go
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//
// DISCLAIMER
//
// Copyright 2016-2024 ArangoDB GmbH, Cologne, Germany
//
// 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.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package storage
import (
"context"
"fmt"
"time"
"github.com/arangodb/kube-arangodb/pkg/storage/provisioner"
"github.com/arangodb/kube-arangodb/pkg/storage/provisioner/client"
"github.com/arangodb/kube-arangodb/pkg/util/errors"
"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
)
type Clients map[string]provisioner.API
func (c Clients) Copy() Clients {
r := make(Clients, len(c))
for k, v := range c {
r[k] = v
}
return r
}
func (c Clients) Filter(f func(node string, client provisioner.API) bool) Clients {
r := make(Clients, len(c))
for k, v := range c {
if f(k, v) {
r[k] = v
}
}
return r
}
func (c Clients) Keys() []string {
r := make([]string, 0, len(c))
for k := range c {
r = append(r, k)
}
return r
}
// createProvisionerClients creates a list of clients for all known
// provisioners.
func (ls *LocalStorage) createProvisionerClients(ctx context.Context) (Clients, error) {
// Find provisioner endpoints
ns := ls.apiObject.GetNamespace()
listOptions := k8sutil.LocalStorageListOpt(ls.apiObject.GetName(), roleProvisioner)
items, err := ls.deps.Client.Kubernetes().CoreV1().Endpoints(ns).List(context.Background(), listOptions)
if err != nil {
return nil, errors.WithStack(err)
}
addrs := createValidEndpointList(items)
if len(addrs) == 0 {
// No provisioners available
return nil, nil
}
// Create clients for endpoints
clients := make(map[string]provisioner.API, len(addrs))
for _, addr := range addrs {
c, err := client.New(fmt.Sprintf("http://%s", addr))
if err != nil {
return nil, errors.WithStack(err)
}
if info, err := ls.fetchClientNodeInfo(ctx, c); err == nil {
clients[info.NodeName] = c
}
}
return clients, nil
}
func (ls *LocalStorage) fetchClientNodeInfo(ctx context.Context, c provisioner.API) (provisioner.NodeInfo, error) {
nctx, cancel := context.WithTimeout(ctx, 3*time.Second)
defer cancel()
return c.GetNodeInfo(nctx)
}
// GetClientByNodeName looks for a client that serves the given node name.
// Returns an error if no such client is found.
func (ls *LocalStorage) GetClientByNodeName(ctx context.Context, nodeName string) (provisioner.API, error) {
clients, err := ls.createProvisionerClients(ctx)
if err != nil {
return nil, errors.WithStack(err)
}
// Find matching client
if c, ok := clients[nodeName]; ok {
return c, nil
}
return nil, errors.WithStack(errors.Errorf("No client found for node name '%s'", nodeName))
}