Module org.elasticsearch.server

Package org.elasticsearch.plugins.interceptor

Interface RestServerActionPlugin

All Superinterfaces:

ActionPlugin

public interface RestServerActionPlugin
extends ActionPlugin

An action plugin that intercepts incoming the REST requests.

Nested Class Summary

Nested classes/interfaces inherited from interface org.elasticsearch.plugins.ActionPlugin

ActionPlugin.ActionHandler<Request extends ActionRequest,Response extends ActionResponse>

Method Summary

Modifier and Type	Method	Description
default RestController	getRestController(RestInterceptor interceptor, NodeClient client, CircuitBreakerService circuitBreakerService, UsageService usageService, Tracer tracer)	Returns a replacement RestController to be used in the server.
RestInterceptor	getRestHandlerInterceptor(ThreadContext threadContext)	Returns a function used to intercept each rest request before handling the request.

Methods inherited from interface org.elasticsearch.plugins.ActionPlugin

getActionFilters, getActions, getRestHandlers, getRestHeaders, getTaskHeaders, indicesAliasesRequestValidators, mappingRequestValidators

Method Details

getRestHandlerInterceptor

RestInterceptor getRestHandlerInterceptor(ThreadContext threadContext)

Returns a function used to intercept each rest request before handling the request. The returned UnaryOperator is called for every incoming rest request and receives the original rest handler as it's input. This allows adding arbitrary functionality around rest request handlers to do for instance logging or authentication. A simple example of how to only allow GET request is here:

 
    UnaryOperator<RestHandler> getRestHandlerInterceptor(ThreadContext threadContext) {
      return originalHandler -> (RestHandler) (request, channel, client) -> {
        if (request.method() != Method.GET) {
          throw new IllegalStateException("only GET requests are allowed");
        }
        originalHandler.handleRequest(request, channel, client);
      };
    }
 
 

Note: Only one installed plugin may implement a rest interceptor.

getRestController

@Nullable
default RestController getRestController(@Nullable
 RestInterceptor interceptor,
 NodeClient client,
 CircuitBreakerService circuitBreakerService,
 UsageService usageService,
 Tracer tracer)

Returns a replacement RestController to be used in the server. Note: Only one installed plugin may override the rest controller.