Package jetbrains.buildServer.controllers.interceptors.proxy

Class ExternalLoadBalancerInterceptor

java.lang.Object

jetbrains.buildServer.controllers.interceptors.proxy.ExternalLoadBalancerInterceptor

All Implemented Interfaces:

org.springframework.web.servlet.AsyncHandlerInterceptor, org.springframework.web.servlet.HandlerInterceptor

public class ExternalLoadBalancerInterceptor
extends Object
implements org.springframework.web.servlet.AsyncHandlerInterceptor

Interceptor, responsible for managing requests that come from external load balancers When external proxy is used to route requests between agents and multi-node TeamCity setup, the agents use cookies to hint proxy where to route the request. On the server side, we check whether the request landed on a node which is responsible for the build that produced the request or not. If the request has landed on a responsible node, ExternalLoadBalancerInterceptor prolongs the lifetime of the cookie by the value of PROPERTY_MULTI_NODE_COOKIE_LONG_LIFETIME property If (when the responsible node is down) the request has landed on another node for the first time, ExternalLoadBalancerInterceptor sets a new cookie lifetime with value of PROPERTY_MULTI_NODE_COOKIE_SHORT_LIFETIME and refuses to process the request by sending HttpStatus.SC_SERVICE_UNAVAILABLE. When the cookie expires and the request without cookie lands on any node that is capable of taking the responsibility for the build, the build is reassigned to this node, a new cookie with PROPERTY_MULTI_NODE_COOKIE_LONG_LIFETIME is set and the node proceeds with processing the request.

Author:

Oleg Rybak (oleg.rybak@jetbrains.com)

See Also:

TW-66859 issue in YouTrack

Constructor Summary

Constructors

Constructor	Description
ExternalLoadBalancerInterceptor(TimeService timeService, BuildPromotionManagerEx buildPromotionManager, BuildsManager buildsManager, TeamCityNodes teamCityNodes, BuildAgentMessagesQueue buildAgentMessagesQueue, ServerResponsibility serverResponsibility)

Method Summary

Modifier and Type	Method	Description
long	getLongCookieLifetimeMillis()
long	getShortCookieLifetimeMillis()
boolean	preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.springframework.web.servlet.AsyncHandlerInterceptor

afterConcurrentHandlingStarted

Methods inherited from interface org.springframework.web.servlet.HandlerInterceptor

afterCompletion, postHandle

Constructor Detail

ExternalLoadBalancerInterceptor

public ExternalLoadBalancerInterceptor(@NotNull
                                       TimeService timeService,
                                       @NotNull
                                       BuildPromotionManagerEx buildPromotionManager,
                                       @NotNull
                                       BuildsManager buildsManager,
                                       @NotNull
                                       TeamCityNodes teamCityNodes,
                                       @NotNull
                                       BuildAgentMessagesQueue buildAgentMessagesQueue,
                                       @NotNull
                                       ServerResponsibility serverResponsibility)

Method Detail

preHandle

public boolean preHandle(@NotNull
                         javax.servlet.http.HttpServletRequest request,
                         @NotNull
                         javax.servlet.http.HttpServletResponse response,
                         @NotNull
                         Object handler)
                  throws Exception

Specified by:

preHandle in interface org.springframework.web.servlet.HandlerInterceptor

Throws:

Exception

getShortCookieLifetimeMillis

public long getShortCookieLifetimeMillis()

getLongCookieLifetimeMillis

public long getLongCookieLifetimeMillis()