+func (kc *KeepClient) cache() *BlockCache {
+ if kc.BlockCache != nil {
+ return kc.BlockCache
+ } else {
+ return DefaultBlockCache
+ }
+}
+
+func (kc *KeepClient) ClearBlockCache() {
+ kc.cache().Clear()
+}
+
+var (
+ // There are four global http.Client objects for the four
+ // possible permutations of TLS behavior (verify/skip-verify)
+ // and timeout settings (proxy/non-proxy).
+ defaultClient = map[bool]map[bool]HTTPClient{
+ // defaultClient[false] is used for verified TLS reqs
+ false: {},
+ // defaultClient[true] is used for unverified
+ // (insecure) TLS reqs
+ true: {},
+ }
+ defaultClientMtx sync.Mutex
+)
+
+// httpClient returns the HTTPClient field if it's not nil, otherwise
+// whichever of the four global http.Client objects is suitable for
+// the current environment (i.e., TLS verification on/off, keep
+// services are/aren't proxies).
+func (kc *KeepClient) httpClient() HTTPClient {
+ if kc.HTTPClient != nil {
+ return kc.HTTPClient
+ }
+ defaultClientMtx.Lock()
+ defer defaultClientMtx.Unlock()
+ if c, ok := defaultClient[kc.Arvados.ApiInsecure][kc.foundNonDiskSvc]; ok {
+ return c
+ }
+
+ var requestTimeout, connectTimeout, keepAlive, tlsTimeout time.Duration
+ if kc.foundNonDiskSvc {
+ // Use longer timeouts when connecting to a proxy,
+ // because this usually means the intervening network
+ // is slower.
+ requestTimeout = DefaultProxyRequestTimeout
+ connectTimeout = DefaultProxyConnectTimeout
+ tlsTimeout = DefaultProxyTLSHandshakeTimeout
+ keepAlive = DefaultProxyKeepAlive
+ } else {
+ requestTimeout = DefaultRequestTimeout
+ connectTimeout = DefaultConnectTimeout
+ tlsTimeout = DefaultTLSHandshakeTimeout
+ keepAlive = DefaultKeepAlive
+ }
+
+ transport, ok := http.DefaultTransport.(*http.Transport)
+ if ok {
+ copy := *transport
+ transport = ©
+ } else {
+ // Evidently the application has replaced
+ // http.DefaultTransport with a different type, so we
+ // need to build our own from scratch using the Go 1.8
+ // defaults.
+ transport = &http.Transport{
+ MaxIdleConns: 100,
+ IdleConnTimeout: 90 * time.Second,
+ ExpectContinueTimeout: time.Second,
+ }
+ }
+ transport.DialContext = (&net.Dialer{
+ Timeout: connectTimeout,
+ KeepAlive: keepAlive,
+ DualStack: true,
+ }).DialContext
+ transport.TLSHandshakeTimeout = tlsTimeout
+ transport.TLSClientConfig = arvadosclient.MakeTLSConfig(kc.Arvados.ApiInsecure)
+ c := &http.Client{
+ Timeout: requestTimeout,
+ Transport: transport,
+ }
+ defaultClient[kc.Arvados.ApiInsecure][kc.foundNonDiskSvc] = c
+ return c
+}
+