mirror of
https://github.com/gravitational/teleport.git
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76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
/*
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Copyright 2022 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package azure
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import (
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"sync"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore/arm"
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"github.com/gravitational/trace"
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)
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// ClientMap is a generic map that caches a collection of Azure clients by
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// subscriptions.
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type ClientMap[ClientType any] struct {
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mu sync.RWMutex
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clients map[string]ClientType
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newClient func(string, azcore.TokenCredential, *arm.ClientOptions) (ClientType, error)
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}
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// NewClientMap creates a new ClientMap.
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func NewClientMap[ClientType any](newClient func(string, azcore.TokenCredential, *arm.ClientOptions) (ClientType, error)) ClientMap[ClientType] {
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return ClientMap[ClientType]{
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clients: make(map[string]ClientType),
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newClient: newClient,
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}
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}
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// Get returns an Azure client by subscription. A new client is created if the
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// subscription is not found in the map.
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func (m *ClientMap[ClientType]) Get(subscription string, getCredentials func() (azcore.TokenCredential, error)) (client ClientType, err error) {
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m.mu.RLock()
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if client, ok := m.clients[subscription]; ok {
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m.mu.RUnlock()
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return client, nil
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}
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m.mu.RUnlock()
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m.mu.Lock()
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defer m.mu.Unlock()
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// If some other thread already got here first.
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if client, ok := m.clients[subscription]; ok {
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return client, nil
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}
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cred, err := getCredentials()
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if err != nil {
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return client, trace.Wrap(err)
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}
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// TODO(gavin): if/when we support AzureChina/AzureGovernment, we will need to specify the cloud in these options
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options := &arm.ClientOptions{}
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client, err = m.newClient(subscription, cred, options)
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if err != nil {
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return client, trace.Wrap(err)
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}
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m.clients[subscription] = client
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return client, nil
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}
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