7db1d4f6e9
Signed-off-by: vanceli <vanceli@tencent.com> Signed-off-by: Vance Li <vncl@YingyingM1.local> Co-authored-by: vanceli <vanceli@tencent.com>
108 lines
2.3 KiB
Go
108 lines
2.3 KiB
Go
package proxy
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import (
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"crypto/tls"
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"runtime"
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"sync/atomic"
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"time"
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"github.com/coredns/coredns/plugin/pkg/log"
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"github.com/coredns/coredns/plugin/pkg/up"
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)
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// Proxy defines an upstream host.
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type Proxy struct {
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fails uint32
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addr string
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transport *Transport
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readTimeout time.Duration
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// health checking
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probe *up.Probe
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health HealthChecker
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}
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// NewProxy returns a new proxy.
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func NewProxy(addr, trans string) *Proxy {
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p := &Proxy{
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addr: addr,
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fails: 0,
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probe: up.New(),
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readTimeout: 2 * time.Second,
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transport: newTransport(addr),
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}
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p.health = NewHealthChecker(trans, true, ".")
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runtime.SetFinalizer(p, (*Proxy).finalizer)
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return p
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}
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func (p *Proxy) Addr() string { return p.addr }
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// SetTLSConfig sets the TLS config in the lower p.transport and in the healthchecking client.
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func (p *Proxy) SetTLSConfig(cfg *tls.Config) {
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p.transport.SetTLSConfig(cfg)
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p.health.SetTLSConfig(cfg)
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}
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// SetExpire sets the expire duration in the lower p.transport.
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func (p *Proxy) SetExpire(expire time.Duration) { p.transport.SetExpire(expire) }
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func (p *Proxy) GetHealthchecker() HealthChecker {
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return p.health
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}
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func (p *Proxy) Fails() uint32 {
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return atomic.LoadUint32(&p.fails)
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}
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// Healthcheck kicks of a round of health checks for this proxy.
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func (p *Proxy) Healthcheck() {
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if p.health == nil {
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log.Warning("No healthchecker")
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return
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}
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p.probe.Do(func() error {
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return p.health.Check(p)
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})
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}
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// Down returns true if this proxy is down, i.e. has *more* fails than maxfails.
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func (p *Proxy) Down(maxfails uint32) bool {
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if maxfails == 0 {
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return false
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}
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fails := atomic.LoadUint32(&p.fails)
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return fails > maxfails
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}
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// Stop close stops the health checking goroutine.
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func (p *Proxy) Stop() { p.probe.Stop() }
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func (p *Proxy) finalizer() { p.transport.Stop() }
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// Start starts the proxy's healthchecking.
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func (p *Proxy) Start(duration time.Duration) {
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p.probe.Start(duration)
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p.transport.Start()
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}
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func (p *Proxy) SetReadTimeout(duration time.Duration) {
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p.readTimeout = duration
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}
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// incrementFails increments the number of fails safely.
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func (p *Proxy) incrementFails() {
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curVal := atomic.LoadUint32(&p.fails)
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if curVal > curVal+1 {
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// overflow occurred, do not update the counter again
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return
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}
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atomic.AddUint32(&p.fails, 1)
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}
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const (
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maxTimeout = 2 * time.Second
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)
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