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mw/proxy: simplify google code (#1019)

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* mw/proxy: simplify google code

Minimize bootstrap code a bit, and block on the first resolve of the
google https endpont. Add more logging and include actual error in the
returned errors.

Also re-resolve every 120 seconds, instead of 300 (might eventually make
this an option).

* fix test
This commit is contained in:
Miek Gieben
2017-09-02 18:43:52 +02:00
committed by GitHub
parent 3a96d1ab77
commit 9bcddc5c16
5 changed files with 48 additions and 43 deletions
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12
middleware/proxy/proxy.go
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@@ -3,6 +3,7 @@ package proxy
import (
"errors"
"fmt"
"sync/atomic"
"time"
@@ -70,6 +71,8 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
for {
start := time.Now()
reply := new(dns.Msg)
var backendErr error
// Since Select() should give us "up" hosts, keep retrying
// hosts until timeout (or until we get a nil host).
@@ -79,7 +82,7 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
RequestDuration.WithLabelValues(state.Proto(), upstream.Exchanger().Protocol(), upstream.From()).Observe(float64(time.Since(start) / time.Millisecond))
return dns.RcodeServerFailure, errUnreachable
return dns.RcodeServerFailure, fmt.Errorf("%s: %s", errUnreachable, "no upstream host")
}
if span != nil {
@@ -90,7 +93,7 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
atomic.AddInt64(&host.Conns, 1)
queryEpoch := msg.Epoch()
reply, backendErr := upstream.Exchanger().Exchange(ctx, host.Name, state)
reply, backendErr = upstream.Exchanger().Exchange(ctx, host.Name, state)
respEpoch := msg.Epoch()
atomic.AddInt64(&host.Conns, -1)
@@ -99,8 +102,7 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
child.Finish()
}
taperr := toDnstap(ctx, host.Name, upstream.Exchanger(), state, reply,
queryEpoch, respEpoch)
taperr := toDnstap(ctx, host.Name, upstream.Exchanger(), state, reply, queryEpoch, respEpoch)
if backendErr == nil {
w.WriteMsg(reply)
@@ -123,7 +125,7 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
RequestDuration.WithLabelValues(state.Proto(), upstream.Exchanger().Protocol(), upstream.From()).Observe(float64(time.Since(start) / time.Millisecond))
return dns.RcodeServerFailure, errUnreachable
return dns.RcodeServerFailure, fmt.Errorf("%s: %s", errUnreachable, backendErr)
}
}