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https://github.com/coredns/coredns.git
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5b844b5017
* plugin/forward: add it This moves coredns/forward into CoreDNS. Fixes as a few bugs, adds a policy option and more tests to the plugin. Update the documentation, test IPv6 address and add persistent tests. * Always use random policy when spraying * include scrub fix here as well * use correct var name * Code review * go vet * Move logging to metrcs * Small readme updates * Fix readme
78 lines
1.5 KiB
Go
78 lines
1.5 KiB
Go
package forward
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import (
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"crypto/tls"
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"sync"
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"time"
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"github.com/miekg/dns"
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)
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// Proxy defines an upstream host.
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type Proxy struct {
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host *host
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transport *transport
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// copied from Forward.
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hcInterval time.Duration
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forceTCP bool
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stop chan bool
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sync.RWMutex
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}
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// NewProxy returns a new proxy.
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func NewProxy(addr string) *Proxy {
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host := newHost(addr)
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p := &Proxy{
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host: host,
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hcInterval: hcDuration,
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stop: make(chan bool),
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transport: newTransport(host),
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}
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return p
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}
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// SetTLSConfig sets the TLS config in the lower p.host.
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func (p *Proxy) SetTLSConfig(cfg *tls.Config) { p.host.tlsConfig = cfg }
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// SetExpire sets the expire duration in the lower p.host.
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func (p *Proxy) SetExpire(expire time.Duration) { p.host.expire = expire }
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func (p *Proxy) close() { p.stop <- true }
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// Dial connects to the host in p with the configured transport.
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func (p *Proxy) Dial(proto string) (*dns.Conn, error) { return p.transport.Dial(proto) }
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// Yield returns the connection to the pool.
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func (p *Proxy) Yield(c *dns.Conn) { p.transport.Yield(c) }
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// Down returns if this proxy is up or down.
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func (p *Proxy) Down(maxfails uint32) bool { return p.host.down(maxfails) }
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func (p *Proxy) healthCheck() {
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// stop channel
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p.host.SetClient()
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p.host.Check()
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tick := time.NewTicker(p.hcInterval)
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for {
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select {
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case <-tick.C:
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p.host.Check()
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case <-p.stop:
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return
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}
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}
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}
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const (
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dialTimeout = 4 * time.Second
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timeout = 2 * time.Second
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hcDuration = 500 * time.Millisecond
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)
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