mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-03 16:14:19 +08:00
rosstimothy
8410d1e4fb
The imds pacakges are inteneded to be very lightweight and consumable by client tools without any additional cloud specific dependencies. By inverting dependencies such that lib/cloud/gcp depends on lib/cloud/imds/gcp client tools no longer transatively import the very large `cloud.google.com/go/compute/apiv1`. The depguard rules were also updated to prevent any accidental regressions.
67 lines
2.0 KiB
Go
67 lines
2.0 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package cloud
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import (
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"context"
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"time"
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"github.com/gravitational/trace"
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"github.com/gravitational/teleport/lib/cloud/imds"
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)
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// discoverInstanceMetadataTimeout is the maximum amount of time allowed
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// to discover an instance metadata service. The timeout is short to
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// minimize Teleport's startup time when it isn't running on any cloud
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// instance. Checking for instance metadata typically takes less than 30ms.
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const discoverInstanceMetadataTimeout = 500 * time.Millisecond
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// DiscoverInstanceMetadata checks which cloud instance type Teleport is
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// running on, if any.
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func DiscoverInstanceMetadata(ctx context.Context, providers []func(ctx context.Context) (imds.Client, error)) (imds.Client, error) {
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ctx, cancel := context.WithTimeout(ctx, discoverInstanceMetadataTimeout)
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defer cancel()
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c := make(chan imds.Client)
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clients := make([]imds.Client, 0, len(providers))
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for _, constructor := range providers {
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im, err := constructor(ctx)
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if err == nil {
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clients = append(clients, im)
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}
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}
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for _, client := range clients {
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client := client
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go func() {
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if client.IsAvailable(ctx) {
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c <- client
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}
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}()
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}
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select {
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case client := <-c:
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return client, nil
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case <-ctx.Done():
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return nil, trace.NotFound("no instance metadata service found")
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}
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}
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