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net/dns: move mutex before the field it guards

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And some misc doc tweaks for idiomatic Go style.

Updates #cleanup

Change-Id: I3ca45f78aaca037f433538b847fd6a9571a2d918
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2024-06-25 12:21:32 -07:00 committed by Brad Fitzpatrick
parent 94defc4056
commit 9766f0e110
3 changed files with 14 additions and 10 deletions
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12
net/dns/manager.go
View File

@ -59,11 +59,10 @@ type Manager struct {
knobs *controlknobs.Knobs // or nil
goos string // if empty, gets set to runtime.GOOS
// The last configuration we successfully compiled. Set to nil if
// there was any failure applying the last configuration
mu sync.Mutex // guards following
// config is the last configuration we successfully compiled or nil if there
// was any failure applying the last configuration.
config *Config
// Must be held when accessing/setting config.
mu sync.Mutex
}
// NewManagers created a new manager from the given config.
@ -123,8 +122,9 @@ func (m *Manager) Set(cfg Config) error {
return m.setLocked(cfg)
}
// Sets the DNS configuration.
// m.mu must be held
// setLocked sets the DNS configuration.
//
// m.mu must be held.
func (m *Manager) setLocked(cfg Config) error {
syncs.AssertLocked(&m.mu)

4
net/dns/resolver/forwarder.go
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@ -212,7 +212,9 @@ type forwarder struct {
// resolver lookup.
cloudHostFallback []resolverAndDelay
// To be called when a SERVFAIL is returned due to missing upstream resolvers.
// missingUpstreamRecovery, if non-nil, is set called when a SERVFAIL is
// returned due to missing upstream resolvers.
//
// This should attempt to properly (re)set the upstream resolvers.
missingUpstreamRecovery func()
}

8
net/dns/resolver/tsdns.go
View File

@ -244,9 +244,11 @@ func New(logf logger.Logf, linkSel ForwardLinkSelector, dialer *tsdial.Dialer, k
return r
}
// Called by the forwarder on SERVFAIL due to missing upstream resolvers
// The func passed in here should attempt to re-query for those resolvers,
// repair, or recover
// SetMissingUpstreamRecovery sets a callback to be called upon encountering
// a SERVFAIL due to missing upstream resolvers.
//
// This call should only happen before the resolver is used. It is not safe
// for concurrent use.
func (r *Resolver) SetMissingUpstreamRecovery(f func()) {
r.forwarder.missingUpstreamRecovery = f
}