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117 lines
3.2 KiB
117 lines
3.2 KiB
/* |
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Copyright 2015 The Kubernetes Authors. |
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Licensed under the Apache License, Version 2.0 (the "License"); |
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you may not use this file except in compliance with the License. |
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You may obtain a copy of the License at |
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http://www.apache.org/licenses/LICENSE-2.0 |
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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*/ |
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package transport |
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import ( |
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"fmt" |
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"net" |
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"net/http" |
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"sync" |
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"time" |
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utilnet "k8s.io/apimachinery/pkg/util/net" |
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) |
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// TlsTransportCache caches TLS http.RoundTrippers different configurations. The |
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// same RoundTripper will be returned for configs with identical TLS options If |
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// the config has no custom TLS options, http.DefaultTransport is returned. |
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type tlsTransportCache struct { |
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mu sync.Mutex |
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transports map[tlsCacheKey]*http.Transport |
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} |
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const idleConnsPerHost = 25 |
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var tlsCache = &tlsTransportCache{transports: make(map[tlsCacheKey]*http.Transport)} |
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type tlsCacheKey struct { |
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insecure bool |
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caData string |
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certData string |
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keyData string |
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getCert string |
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serverName string |
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dial string |
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} |
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func (t tlsCacheKey) String() string { |
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keyText := "<none>" |
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if len(t.keyData) > 0 { |
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keyText = "<redacted>" |
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} |
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return fmt.Sprintf("insecure:%v, caData:%#v, certData:%#v, keyData:%s, getCert: %s, serverName:%s, dial:%s", t.insecure, t.caData, t.certData, keyText, t.getCert, t.serverName, t.dial) |
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} |
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func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) { |
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key, err := tlsConfigKey(config) |
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if err != nil { |
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return nil, err |
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} |
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// Ensure we only create a single transport for the given TLS options |
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c.mu.Lock() |
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defer c.mu.Unlock() |
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// See if we already have a custom transport for this config |
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if t, ok := c.transports[key]; ok { |
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return t, nil |
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} |
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// Get the TLS options for this client config |
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tlsConfig, err := TLSConfigFor(config) |
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if err != nil { |
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return nil, err |
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} |
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// The options didn't require a custom TLS config |
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if tlsConfig == nil && config.Dial == nil { |
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return http.DefaultTransport, nil |
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} |
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dial := config.Dial |
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if dial == nil { |
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dial = (&net.Dialer{ |
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Timeout: 30 * time.Second, |
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KeepAlive: 30 * time.Second, |
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}).DialContext |
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} |
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// Cache a single transport for these options |
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c.transports[key] = utilnet.SetTransportDefaults(&http.Transport{ |
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Proxy: http.ProxyFromEnvironment, |
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TLSHandshakeTimeout: 10 * time.Second, |
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TLSClientConfig: tlsConfig, |
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MaxIdleConnsPerHost: idleConnsPerHost, |
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DialContext: dial, |
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}) |
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return c.transports[key], nil |
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} |
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// tlsConfigKey returns a unique key for tls.Config objects returned from TLSConfigFor |
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func tlsConfigKey(c *Config) (tlsCacheKey, error) { |
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// Make sure ca/key/cert content is loaded |
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if err := loadTLSFiles(c); err != nil { |
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return tlsCacheKey{}, err |
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} |
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return tlsCacheKey{ |
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insecure: c.TLS.Insecure, |
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caData: string(c.TLS.CAData), |
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certData: string(c.TLS.CertData), |
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keyData: string(c.TLS.KeyData), |
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getCert: fmt.Sprintf("%p", c.TLS.GetCert), |
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serverName: c.TLS.ServerName, |
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dial: fmt.Sprintf("%p", c.Dial), |
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}, nil |
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}
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