Reuse http.DefaultTransport in UIMetricsProxy (#14521)

http.Transport keeps a pool of connections and should be reused when possible. We instantiate a new http.DefaultTransport for every metrics request, making large numbers of concurrent requests inefficiently spin up new connections instead of reusing open ones.
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Chris S. Kim 2022-09-08 11:02:05 -04:00 committed by GitHub
parent 6cd25728e5
commit 331c756471
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4 changed files with 11 additions and 2 deletions

3
.changelog/14521.txt Normal file
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@ -0,0 +1,3 @@
```release-note:improvement
ui: Reuse connections for requests to /v1/internal/ui/metrics-proxy/
```

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@ -939,8 +939,9 @@ func (a *Agent) listenHTTP() ([]apiServer, error) {
}
srv := &HTTPHandlers{
agent: a,
denylist: NewDenylist(a.config.HTTPBlockEndpoints),
agent: a,
denylist: NewDenylist(a.config.HTTPBlockEndpoints),
proxyTransport: http.DefaultTransport,
}
a.configReloaders = append(a.configReloaders, srv.ReloadConfig)
a.httpHandlers = srv

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@ -81,6 +81,10 @@ type HTTPHandlers struct {
configReloaders []ConfigReloader
h http.Handler
metricsProxyCfg atomic.Value
// proxyTransport is used by UIMetricsProxy to keep
// a managed pool of connections.
proxyTransport http.RoundTripper
}
// endpoint is a Consul-specific HTTP handler that takes the usual arguments in

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@ -771,6 +771,7 @@ func (s *HTTPHandlers) UIMetricsProxy(resp http.ResponseWriter, req *http.Reques
Director: func(r *http.Request) {
r.URL = u
},
Transport: s.proxyTransport,
ErrorLog: log.StandardLogger(&hclog.StandardLoggerOptions{
InferLevels: true,
}),