org.apache.flink.runtime.rest.handler.legacy.files

Class StaticFileServerHandler<T extends RestfulGateway>

java.lang.Object

org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerAdapter

org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler<RoutedRequest>

org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler<T>

org.apache.flink.runtime.rest.handler.legacy.files.StaticFileServerHandler<T>

All Implemented Interfaces:

org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler, org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandler

@ChannelHandler.Sharable
public class StaticFileServerHandler<T extends RestfulGateway>
extends LeaderRetrievalHandler<T>

Simple file server handler that serves requests to web frontend's static files, such as HTML, CSS, or JS files.

This code is based on the "HttpStaticFileServerHandler" from the Netty project's HTTP server example.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field and Description
static String	HTTP_DATE_FORMAT Date format for HTTP.

Fields inherited from class org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler

leaderRetriever, logger, responseHeaders, timeout

Constructor Summary

Constructors

Constructor and Description
StaticFileServerHandler(GatewayRetriever<? extends T> retriever, org.apache.flink.api.common.time.Time timeout, File rootPath)

Method Summary

Modifier and Type	Method and Description
static void	checkFileValidity(File file, File rootPath, org.slf4j.Logger logger) Checks various conditions for file access.
void	exceptionCaught(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext ctx, Throwable cause)
protected void	respondAsLeader(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext channelHandlerContext, RoutedRequest routedRequest, T gateway)
static void	sendNotModified(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext ctx) Send the "304 Not Modified" response.
static void	setContentTypeHeader(org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponse response, File file) Sets the content type header for the HTTP Response.
static void	setDateAndCacheHeaders(org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponse response, File fileToCache) Sets the "date" and "cache" headers for the HTTP Response.
static void	setDateHeader(org.apache.flink.shaded.netty4.io.netty.handler.codec.http.FullHttpResponse response) Sets the "date" header for the HTTP response.

Methods inherited from class org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler

channelRead0, getTimeout

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler

acceptInboundMessage, channelRead

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, userEventTriggered

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

handlerAdded, handlerRemoved

Field Detail

HTTP_DATE_FORMAT

public static final String HTTP_DATE_FORMAT

Date format for HTTP.

See Also:

Constant Field Values

Constructor Detail

StaticFileServerHandler

public StaticFileServerHandler(GatewayRetriever<? extends T> retriever,
                               org.apache.flink.api.common.time.Time timeout,
                               File rootPath)
                        throws IOException

Throws:

IOException

Method Detail

respondAsLeader

protected void respondAsLeader(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext channelHandlerContext,
                               RoutedRequest routedRequest,
                               T gateway)
                        throws Exception

Specified by:

respondAsLeader in class LeaderRetrievalHandler<T extends RestfulGateway>

Throws:

Exception

exceptionCaught

public void exceptionCaught(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext ctx,
                            Throwable cause)

Specified by:

exceptionCaught in interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

Specified by:

exceptionCaught in interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandler

Overrides:

exceptionCaught in class org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

sendNotModified

public static void sendNotModified(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext ctx)

Send the "304 Not Modified" response. This response can be used when the file timestamp is the same as what the browser is sending up.

Parameters:

ctx - The channel context to write the response to.

setDateHeader

public static void setDateHeader(org.apache.flink.shaded.netty4.io.netty.handler.codec.http.FullHttpResponse response)

Sets the "date" header for the HTTP response.

Parameters:

response - HTTP response

setDateAndCacheHeaders

public static void setDateAndCacheHeaders(org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponse response,
                                          File fileToCache)

Sets the "date" and "cache" headers for the HTTP Response.

Parameters:

response - The HTTP response object.

fileToCache - File to extract the modification timestamp from.

setContentTypeHeader

public static void setContentTypeHeader(org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponse response,
                                        File file)

Sets the content type header for the HTTP Response.

Parameters:

response - HTTP response

file - file to extract content type

checkFileValidity

public static void checkFileValidity(File file,
                                     File rootPath,
                                     org.slf4j.Logger logger)
                              throws IOException,
                                     RestHandlerException

Checks various conditions for file access. If all checks pass this method returns, and processing of the request may continue. If any check fails this method throws a RestHandlerException, and further processing of the request must be limited to sending an error response.

Throws:

IOException

RestHandlerException