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perf: excessive torrent tracker dns resolve (GopeedLab#634)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package bt | ||
|
|
||
| import ( | ||
| "context" | ||
| "net" | ||
| "time" | ||
|
|
||
| "github.com/rs/dnscache" | ||
| ) | ||
|
|
||
| // DnsCacheResolver resolves DNS requests for an HTTP client using an in-memory cache. | ||
| type DnsCacheResolver struct { | ||
| RefreshTimeout time.Duration | ||
|
|
||
| resolver dnscache.Resolver | ||
| } | ||
|
|
||
| func (r *DnsCacheResolver) DialContext(ctx context.Context, network, address string) (net.Conn, error) { | ||
| host, port, err := net.SplitHostPort(address) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| ips, err := r.resolver.LookupHost(ctx, host) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var conn net.Conn | ||
| for _, ip := range ips { | ||
| var dialer net.Dialer | ||
| conn, err = dialer.DialContext(ctx, network, net.JoinHostPort(ip, port)) | ||
| if err == nil { | ||
| break | ||
| } | ||
| } | ||
| return conn, err | ||
| } | ||
|
|
||
| func (r *DnsCacheResolver) Run(ctx context.Context) { | ||
| ticker := time.NewTicker(r.RefreshTimeout) | ||
| defer ticker.Stop() | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case <-ticker.C: | ||
| r.resolver.Refresh(true) | ||
| } | ||
| } | ||
| } |
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