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Use cancelable contexts for cloud provider plugin refreshes (#4226)

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This commit uses a cancelable context to spawn goroutines that refresh
records from a cloud DNS provider. The Caddy shutdown routine uses the
returned cancel function to terminate existing goroutines when a USR1
reload signal is received.

Signed-off-by: Matt Kulka <mkulka@parchment.com>
This commit is contained in:
Matt Kulka
2020-10-24 05:37:01 -07:00
committed by GitHub
parent 054c9ae1fb
commit 3168a722ca
6 changed files with 12 additions and 11 deletions
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4
plugin/clouddns/clouddns.go
View File

@@ -85,11 +85,11 @@ func (h *CloudDNS) Run(ctx context.Context) error {
for {
select {
case <-ctx.Done():
log.Infof("Breaking out of CloudDNS update loop: %v", ctx.Err())
log.Debugf("Breaking out of CloudDNS update loop for %v: %v", h.zoneNames, ctx.Err())
return
case <-time.After(1 * time.Minute):
if err := h.updateZones(ctx); err != nil && ctx.Err() == nil /* Don't log error if ctx expired. */ {
log.Errorf("Failed to update zones: %v", err)
log.Errorf("Failed to update zones %v: %v", h.zoneNames, err)
}
}
}

4
plugin/clouddns/setup.go
View File

@@ -78,7 +78,7 @@ func setup(c *caddy.Controller) error {
}
}
ctx := context.Background()
ctx, cancel := context.WithCancel(context.Background())
client, err := f(ctx, opt)
if err != nil {
return err
@@ -98,7 +98,7 @@ func setup(c *caddy.Controller) error {
h.Next = next
return h
})
c.OnShutdown(func() error { ctx.Done(); return nil })
c.OnShutdown(func() error { cancel(); return nil })
}
return nil