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ebeef28525
This PR adds a new controller - `DNSServerController` that starts tcp and udp dns servers locally. Just like `EtcFileController` it monitors `ResolverStatusType` and updates the list of destinations from there. Most of the caching logic is in our "lobotomized" "`CoreDNS` fork. We need this fork because default `CoreDNS` carries full Caddy server and various other modules that we don't need in Talos. On our side we implement random selection of the actual dns and request forwarding. Closes #7693 Signed-off-by: Dmitriy Matrenichev <dmitry.matrenichev@siderolabs.com>
28 lines
849 B
Go
28 lines
849 B
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// Package ctxutil provides utilities for working with contexts.
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package ctxutil
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import "context"
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// MonitorFn starts a function in a new goroutine and cancels the context with error as cause when the function returns.
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// It returns the new context.
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func MonitorFn(ctx context.Context, fn func() error) context.Context {
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ctx, cancel := context.WithCancelCause(ctx)
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go func() { cancel(fn()) }()
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return ctx
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}
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// Cause returns the cause of the context error, or nil if there is no error or the error is a usual context error.
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func Cause(ctx context.Context) error {
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if c := context.Cause(ctx); c != ctx.Err() {
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return c
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}
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return nil
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}
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