feature/undertow #4

Merged
manuel merged 15 commits from feature/undertow into master 2023-04-08 22:40:46 +02:00
15 changed files with 632 additions and 641 deletions

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@ -1,7 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd" <settings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/SETTINGS/1.1.0" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> xmlns="http://maven.apache.org/SETTINGS/1.1.0">
<servers> <servers>
<server> <server>
<id>repo.gittr.ch</id> <id>repo.gittr.ch</id>

75
pom.xml
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@ -1,5 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <modelVersion>4.0.0</modelVersion>
<parent> <parent>
@ -11,20 +12,43 @@
<groupId>ch.fritteli.labyrinth</groupId> <groupId>ch.fritteli.labyrinth</groupId>
<artifactId>labyrinth-server</artifactId> <artifactId>labyrinth-server</artifactId>
<version>0.0.2-SNAPSHOT</version> <version>0.0.2-SNAPSHOT</version>
<description>The Labyrinth server, offering a REST endpoint to access the Labyrinth Generator.</description>
<url>https://manuel.friedli.info/labyrinth.html</url>
<properties> <properties>
<logback.version>1.4.6</logback.version>
<lombok.version>1.18.26</lombok.version>
<slf4j.version>2.0.5</slf4j.version>
<java.source.version>17</java.source.version> <java.source.version>17</java.source.version>
<java.target.version>17</java.target.version> <java.target.version>17</java.target.version>
<jetbrains-annotations.version>24.0.1</jetbrains-annotations.version>
<junit-jupiter.version>5.9.2</junit-jupiter.version>
<labyrinth-generator.version>0.0.4</labyrinth-generator.version>
<logback.version>1.4.6</logback.version>
<lombok.version>1.18.26</lombok.version>
<slf4j.version>2.0.7</slf4j.version>
<undertow.version>2.3.5.Final</undertow.version>
<vavr.version>0.10.4</vavr.version>
</properties> </properties>
<developers>
<developer>
<name>Manuel Friedli</name>
<id>manuel</id>
<url>https://www.fritteli.ch/</url>
<email>manuel@fritteli.ch</email>
<timezone>Europe/Zurich</timezone>
<roles>
<role>Project Lead</role>
<role>Software Architect</role>
<role>Software Engineer</role>
<role>Operations Manager</role>
</roles>
</developer>
</developers>
<dependencies> <dependencies>
<dependency> <dependency>
<groupId>ch.fritteli.labyrinth</groupId> <groupId>ch.fritteli.labyrinth</groupId>
<artifactId>labyrinth-generator</artifactId> <artifactId>labyrinth-generator</artifactId>
<version>0.0.2</version> <version>${labyrinth-generator.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>io.vavr</groupId> <groupId>io.vavr</groupId>
@ -48,10 +72,14 @@
<artifactId>logback-classic</artifactId> <artifactId>logback-classic</artifactId>
<version>${logback.version}</version> <version>${logback.version}</version>
</dependency> </dependency>
<dependency>
<groupId>io.undertow</groupId>
<artifactId>undertow-core</artifactId>
<version>${undertow.version}</version>
</dependency>
<dependency> <dependency>
<groupId>org.junit.jupiter</groupId> <groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId> <artifactId>junit-jupiter-api</artifactId>
<scope>test</scope>
</dependency> </dependency>
</dependencies> </dependencies>
@ -60,13 +88,22 @@
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId> <artifactId>maven-shade-plugin</artifactId>
<version>3.2.4</version> <version>3.4.1</version>
<configuration> <configuration>
<transformers> <transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"> <transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>ch.fritteli.labyrinth.server.Main</mainClass> <mainClass>ch.fritteli.labyrinth.server.Main</mainClass>
</transformer> </transformer>
</transformers> </transformers>
<filters>
<filter>
<artifact>ch.fritteli.labyrinth:labyrinth-generator</artifact>
<excludes>
<exclude>logback.xml</exclude>
</excludes>
</filter>
</filters>
</configuration> </configuration>
<executions> <executions>
<execution> <execution>
@ -77,13 +114,31 @@
</execution> </execution>
</executions> </executions>
</plugin> </plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<executions>
<execution>
<id>attach-sources</id>
<phase>verify</phase>
<goals>
<goal>jar-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
<version>4.0.0-M6</version>
</plugin>
</plugins> </plugins>
</build> </build>
<scm> <scm>
<connection>scm:git:git://gittr.ch/java/labyrinth-server.git</connection> <connection>scm:git:https://gittr.ch/java/labyrinth-server.git</connection>
<developerConnection>scm:git:ssh://git@gittr.ch/java/labyrinth-server.git</developerConnection> <developerConnection>scm:git:ssh://git@gittr.ch/java/labyrinth-server.git</developerConnection>
<url>https://gittr.ch/java/labyrinth-server</url> <url>https://gittr.ch/java/labyrinth-server</url>
<tag>v0.0.1</tag> <tag>HEAD</tag>
</scm> </scm>
<distributionManagement> <distributionManagement>
<repository> <repository>

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@ -1,323 +1,59 @@
package ch.fritteli.labyrinth.server; package ch.fritteli.labyrinth.server;
import ch.fritteli.labyrinth.generator.model.Labyrinth; import ch.fritteli.labyrinth.server.handler.CreateHandler;
import ch.fritteli.labyrinth.generator.renderer.html.HTMLRenderer; import ch.fritteli.labyrinth.server.handler.RenderHandler;
import ch.fritteli.labyrinth.generator.renderer.pdf.PDFRenderer; import io.undertow.Undertow;
import ch.fritteli.labyrinth.generator.renderer.text.TextRenderer; import io.undertow.server.RoutingHandler;
import ch.fritteli.labyrinth.generator.serialization.SerializerDeserializer;
import com.sun.net.httpserver.Headers;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpServer;
import io.vavr.collection.HashMap;
import io.vavr.collection.HashSet;
import io.vavr.collection.List;
import io.vavr.collection.Map;
import io.vavr.collection.Set;
import io.vavr.collection.Stream;
import io.vavr.control.Option;
import io.vavr.control.Try; import io.vavr.control.Try;
import lombok.Getter; import java.net.InetSocketAddress;
import lombok.NonNull; import lombok.NonNull;
import lombok.extern.slf4j.Slf4j; import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.Nullable;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Function;
@Slf4j @Slf4j
public class LabyrinthServer { public class LabyrinthServer {
@NonNull
private final HttpServer httpServer;
@NonNull
private final ExecutorService executorService = new ThreadPoolExecutor(0,
1_000,
5,
TimeUnit.SECONDS,
new SynchronousQueue<>()
);
public static Option<LabyrinthServer> createAndStartServer() { @NonNull
final Option<LabyrinthServer> serverOption = Try.of(ServerConfig::init) private final Undertow undertow;
.mapTry(LabyrinthServer::new)
.onFailure(cause -> log.error( private LabyrinthServer(@NonNull final ServerConfig config) {
"Failed to create LabyrinthServer.", final String hostAddress = config.getAddress().getHostAddress();
cause final int port = config.getPort();
)) log.info("Starting Server at http://{}:{}/", hostAddress, port);
.toOption(); final RoutingHandler routingHandler = new RoutingHandler()
serverOption.forEach(LabyrinthServer::start); .get(CreateHandler.PATH_TEMPLATE, new CreateHandler())
return serverOption; .post(RenderHandler.PATH_TEMPLATE, new RenderHandler());
this.undertow = Undertow.builder()
.addHttpListener(port, hostAddress)
.setHandler(routingHandler)
.build();
} }
public LabyrinthServer(@NonNull final ServerConfig config) throws IOException { @NonNull
this.httpServer = HttpServer.create(new InetSocketAddress(config.getAddress(), config.getPort()), 5); public static Try<LabyrinthServer> createAndStartServer() {
this.httpServer.createContext("/", new StaticResourcesFileHandler(this.executorService)); return Try.of(ServerConfig::init)
this.httpServer.createContext("/create", this::handleCreate); .flatMapTry(LabyrinthServer::createAndStartServer);
this.httpServer.createContext("/render", this::handleRender);
} }
public void start() { @NonNull
public static Try<LabyrinthServer> createAndStartServer(@NonNull final ServerConfig config) {
return Try.of(() -> new LabyrinthServer(config))
.peek(LabyrinthServer::start);
}
private void start() {
Runtime.getRuntime().addShutdownHook(new Thread(this::stop, "listener-stopper")); Runtime.getRuntime().addShutdownHook(new Thread(this::stop, "listener-stopper"));
this.httpServer.start(); this.undertow.start();
log.info("Listening on http://{}:{}", final InetSocketAddress address = (InetSocketAddress) this.undertow.getListenerInfo().get(0).getAddress();
this.httpServer.getAddress().getHostString(), final String hostAddress = address.getAddress().getHostAddress();
this.httpServer.getAddress().getPort() final int port = address.getPort();
);
log.info("Listening on http://{}:{}", hostAddress, port);
} }
private void handleCreate(HttpExchange exchange) { private void stop() {
this.executorService.submit(() -> {
log.debug("Handling request to {}", exchange.getRequestURI());
try {
final String requestMethod = exchange.getRequestMethod();
if (!requestMethod.equals("GET")) {
exchange.getResponseBody().close();
exchange.sendResponseHeaders(405, -1);
return;
}
final Map<RequestParameter, String> requestParams = this.parseQueryString(exchange.getRequestURI()
.getQuery());
final int width = this.getOrDefault(requestParams.get(RequestParameter.WIDTH), Integer::valueOf, 5);
final int height = this.getOrDefault(requestParams.get(RequestParameter.HEIGHT), Integer::valueOf, 7);
final Option<Long> idOption = requestParams.get(RequestParameter.ID)
.toTry()
.map(Long::valueOf)
.toOption();
final Option<OutputType> outputOption = requestParams.get(RequestParameter.OUTPUT)
.flatMap(OutputType::ofString);
final Headers responseHeaders = exchange.getResponseHeaders();
final AtomicBoolean needsRedirect = new AtomicBoolean(false);
final long id = idOption.onEmpty(() -> needsRedirect.set(true)).getOrElse(System::nanoTime);
final OutputType output = outputOption.onEmpty(() -> needsRedirect.set(true))
.getOrElse(OutputType.HTML);
if (needsRedirect.get()) {
responseHeaders.add("Location",
"create?width=" + width + "&height=" + height + "&output=" + output.toString() +
"&id=" + id
);
exchange.sendResponseHeaders(302, -1);
return;
}
final byte[] render;
try {
final Labyrinth labyrinth = new Labyrinth(width, height, id);
render = output.render(labyrinth);
} catch (Exception e) {
responseHeaders.add("Content-type", "text/plain; charset=UTF-8");
exchange.sendResponseHeaders(500, 0);
final OutputStream responseBody = exchange.getResponseBody();
responseBody.write(("Error: " + e.getMessage()).getBytes(StandardCharsets.UTF_8));
responseBody.flush();
return;
}
responseHeaders.add("Content-type", output.getContentType());
if (output.isAttachment()) {
responseHeaders.add(
"Content-disposition",
String.format("attachment; filename=\"labyrinth-%dx%d-%d.%s\"",
width,
height,
id,
output.getFileExtension()
)
);
}
exchange.sendResponseHeaders(200, 0);
final OutputStream responseBody = exchange.getResponseBody();
responseBody.write(render);
responseBody.flush();
} catch (Exception e) {
log.error("FSCK!", e);
} finally {
exchange.close();
}
});
}
private void handleRender(final HttpExchange exchange) {
this.executorService.submit(() -> {
try {
log.debug("Handling request to {}", exchange.getRequestURI());
final String requestMethod = exchange.getRequestMethod();
if (!requestMethod.equals("POST")) {
exchange.getResponseBody().close();
exchange.sendResponseHeaders(405, -1);
return;
}
final byte[] bytes = exchange.getRequestBody().readAllBytes();
final Labyrinth labyrinth = SerializerDeserializer.deserialize(bytes);
final OutputType output = exchange.getRequestHeaders()
.get("Accept")
.contains(OutputType.HTML.getContentType()) ?
OutputType.HTML :
OutputType.TEXT_PLAIN;
final byte[] render;
final Headers responseHeaders = exchange.getResponseHeaders();
try {
render = output.render(labyrinth);
} catch (Exception e) {
responseHeaders.add("Content-type", "text/plain; charset=UTF-8");
exchange.sendResponseHeaders(500, 0);
final OutputStream responseBody = exchange.getResponseBody();
responseBody.write(("Error: " + e).getBytes(StandardCharsets.UTF_8));
responseBody.flush();
return;
}
responseHeaders.add("Content-type", output.getContentType());
exchange.sendResponseHeaders(200, 0);
final OutputStream responseBody = exchange.getResponseBody();
responseBody.write(render);
responseBody.flush();
} catch (Exception e) {
log.error("FSCK!", e);
} finally {
exchange.close();
}
});
}
public void stop() {
log.info("Stopping server ..."); log.info("Stopping server ...");
this.httpServer.stop(5); this.undertow.stop();
this.executorService.shutdown();
try {
if (!this.executorService.awaitTermination(5, TimeUnit.SECONDS)) {
log.warn("Timeout occurred while awaiting termination of executor service");
}
} catch (final InterruptedException e) {
log.error("Failed to await termination of executor service", e);
}
log.info("Server stopped."); log.info("Server stopped.");
} }
@NonNull
private Map<RequestParameter, String> parseQueryString(@Nullable final String query) {
if (query == null) {
return HashMap.empty();
}
HashMap<RequestParameter, String> result = HashMap.empty();
final String[] parts = query.split("&");
for (final String part : parts) {
final int split = part.indexOf('=');
if (split == -1) {
final Try<RequestParameter> tryKey = Try.of(() -> this.normalizeParameterName(part));
if (tryKey.isSuccess()) {
result = result.put(tryKey.get(), null);
}
} else {
final String key = part.substring(0, split);
final String value = part.substring(split + 1);
final Try<RequestParameter> tryKey = Try.of(() -> this.normalizeParameterName(key));
if (tryKey.isSuccess()) {
result = result.put(tryKey.get(), value);
}
}
}
return result;
}
private <T> T getOrDefault(@NonNull final Option<String> input,
@NonNull final Function<String, T> mapper,
@Nullable final T defaultValue) {
return input.toTry().map(mapper).getOrElse(defaultValue);
}
private RequestParameter normalizeParameterName(final String paramName) {
return RequestParameter.parseName(paramName).get();
}
private enum RequestParameter {
WIDTH("w", "width"),
HEIGHT("h", "height"),
ID("i", "id"),
OUTPUT("o", "output");
private final Set<String> names;
RequestParameter(@NonNull final String... names) {
this.names = HashSet.of(names);
}
static Option<RequestParameter> parseName(@Nullable final String name) {
if (name == null) {
return Option.none();
}
return Stream.of(values()).find(param -> param.names.exists(name::equalsIgnoreCase));
}
}
private enum OutputType {
TEXT_PLAIN("text/plain; charset=UTF-8",
labyrinth -> TextRenderer.newInstance().render(labyrinth).getBytes(StandardCharsets.UTF_8),
"txt",
false,
"t",
"text"
),
HTML("text/html",
labyrinth -> HTMLRenderer.newInstance().render(labyrinth).getBytes(StandardCharsets.UTF_8),
"html",
false,
"h",
"html"
),
PDF("application/pdf", labyrinth -> PDFRenderer.newInstance().render(labyrinth), "pdf", false, "p", "pdf"),
PDFFILE("application/pdf",
labyrinth -> PDFRenderer.newInstance().render(labyrinth),
"pdf",
true,
"f",
"pdffile"
),
BINARY("application/octet-stream", SerializerDeserializer::serialize, "laby", true, "b", "binary");
@Getter
@NonNull
private final String contentType;
@NonNull
private final List<String> names;
@NonNull
private final Function<Labyrinth, byte[]> render;
@Getter
private final boolean attachment;
@Getter
@NonNull
private final String fileExtension;
OutputType(@NonNull final String contentType,
@NonNull final Function<Labyrinth, byte[]> render,
@NonNull final String fileExtension,
final boolean attachment,
@NonNull final String... names) {
this.contentType = contentType;
this.render = render;
this.fileExtension = fileExtension;
this.attachment = attachment;
this.names = List.of(names);
}
static Option<OutputType> ofString(@Nullable final String name) {
if (name == null) {
return Option.none();
}
final String nameLC = name.toLowerCase();
return Stream.of(values()).find(param -> param.names.contains(nameLC));
}
@Override
public String toString() {
return this.names.last();
}
byte[] render(@NonNull final Labyrinth labyrinth) {
return this.render.apply(labyrinth);
}
}
} }

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@ -1,11 +1,14 @@
package ch.fritteli.labyrinth.server; package ch.fritteli.labyrinth.server;
import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j; import lombok.extern.slf4j.Slf4j;
@Slf4j @Slf4j
@UtilityClass
public class Main { public class Main {
public static void main(String[] args) { public static void main(String[] args) {
LabyrinthServer.createAndStartServer() LabyrinthServer.createAndStartServer()
.onEmpty(() -> log.error("Failed to create server. Stopping.")); .onFailure(e -> log.error("Failed to create server. Stopping.", e));
} }
} }

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@ -0,0 +1,94 @@
package ch.fritteli.labyrinth.server;
import ch.fritteli.labyrinth.generator.model.Labyrinth;
import ch.fritteli.labyrinth.generator.renderer.html.HTMLRenderer;
import ch.fritteli.labyrinth.generator.renderer.pdf.PDFRenderer;
import ch.fritteli.labyrinth.generator.renderer.text.TextRenderer;
import ch.fritteli.labyrinth.generator.serialization.SerializerDeserializer;
import io.vavr.collection.List;
import io.vavr.collection.Stream;
import io.vavr.control.Option;
import lombok.Getter;
import lombok.NonNull;
import org.jetbrains.annotations.Nullable;
import java.nio.charset.StandardCharsets;
import java.util.function.Function;
public enum OutputType {
TEXT_PLAIN("text/plain; charset=UTF-8",
"txt",
labyrinth -> TextRenderer.newInstance().render(labyrinth).getBytes(StandardCharsets.UTF_8),
false,
"t",
"text"),
HTML("text/html",
"html",
labyrinth -> HTMLRenderer.newInstance().render(labyrinth).getBytes(StandardCharsets.UTF_8),
false,
"h",
"html"),
PDF("application/pdf",
"pdf",
labyrinth -> PDFRenderer.newInstance().render(labyrinth).toByteArray(),
false,
"p",
"pdf"),
PDFFILE("application/pdf",
"pdf",
labyrinth -> PDFRenderer.newInstance().render(labyrinth).toByteArray(),
true,
"f",
"pdffile"),
BINARY("application/octet-stream",
"laby",
SerializerDeserializer::serialize,
true,
"b",
"binary");
@Getter
@NonNull
private final String contentType;
@Getter
@NonNull
private final String fileExtension;
@NonNull
private final Function<Labyrinth, byte[]> render;
@Getter
private final boolean attachment;
@Getter
@NonNull
private final List<String> names;
OutputType(@NonNull final String contentType,
@NonNull final String fileExtension,
@NonNull final Function<Labyrinth, byte[]> render,
final boolean attachment,
@NonNull final String... names) {
this.contentType = contentType;
this.render = render;
this.fileExtension = fileExtension;
this.attachment = attachment;
this.names = List.of(names);
}
@NonNull
public static Option<OutputType> ofString(@Nullable final String name) {
return Option.of(name)
.map(String::toLowerCase)
.flatMap(nameLC -> Stream.of(values())
.find(param -> param.names.contains(nameLC)));
}
@NonNull
@Override
public String toString() {
return this.names.last();
}
@NonNull
public byte[] render(@NonNull final Labyrinth labyrinth) {
return this.render.apply(labyrinth);
}
}

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@ -10,7 +10,6 @@ import org.jetbrains.annotations.Nullable;
import java.net.InetAddress; import java.net.InetAddress;
@AllArgsConstructor(access = AccessLevel.PRIVATE) @AllArgsConstructor(access = AccessLevel.PRIVATE)
@Slf4j @Slf4j
@Value @Value
@ -39,7 +38,17 @@ public class ServerConfig {
@NonNull @NonNull
private static InetAddress validateAddress(@Nullable final String address) { private static InetAddress validateAddress(@Nullable final String address) {
return Try.of(() -> InetAddress.getByName(address)) return Try.of(() -> InetAddress.getByName(address))
.getOrElseThrow(cause -> new ConfigurationException("Invalid hostname/address: " + address, cause)); .getOrElseThrow(cause -> new ConfigurationException(
"Invalid hostname/address: %s".formatted(address),
cause
));
}
private static int validatePort(final int port) {
if (port < 0 || port > 0xFFFF) {
throw new ConfigurationException("Port out of range (0..65535): %s".formatted(port));
}
return port;
} }
private static int validatePort(@Nullable final String portString) { private static int validatePort(@Nullable final String portString) {
@ -48,14 +57,9 @@ public class ServerConfig {
return 0; return 0;
} }
return Try.of(() -> Integer.valueOf(portString)) return Try.of(() -> Integer.valueOf(portString))
.map(ServerConfig::validatePort) .getOrElseThrow(cause -> new ConfigurationException(
.getOrElseThrow(cause -> new ConfigurationException("Failed to parse port specified in system property '" + SYSPROP_PORT + "': " + portString, cause)); "Failed to parse port specified in system property '%s': %s".formatted(SYSPROP_PORT, portString),
} cause
));
private static int validatePort(final int port) {
if (port < 0 || port > 0xFFFF) {
throw new ConfigurationException("Port out of range (0..65535): " + port);
}
return port;
} }
} }

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@ -1,101 +0,0 @@
package ch.fritteli.labyrinth.server;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.apache.pdfbox.io.IOUtils;
import org.jetbrains.annotations.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutorService;
@Slf4j
public class StaticResourcesFileHandler implements HttpHandler {
public static final String WEBASSETS_DIRECTORY = "webassets";
private final ExecutorService executorService;
public StaticResourcesFileHandler(final ExecutorService executorService) {
this.executorService = executorService;
log.debug("Created {}", this.getClass().getSimpleName());
}
private static void redirect(@NonNull final HttpExchange exchange, @NonNull final String target) throws IOException {
log.debug("Sending redirect to {}", target);
exchange.getResponseHeaders().add("Location", target);
exchange.sendResponseHeaders(302, -1);
}
private static void notFound(@NonNull final HttpExchange exchange, @NonNull final String path) throws IOException {
log.debug("Resource '{}' not found, replying with HTTP 404", path);
exchange.getResponseHeaders().add("Content-type", "text/plain; charset=utf-8");
exchange.sendResponseHeaders(404, 0);
exchange.getResponseBody().write("404 - Not found".getBytes(StandardCharsets.UTF_8));
exchange.getResponseBody().flush();
}
@NonNull
private static byte[] getBytes(@NonNull final String path) throws IOException {
final InputStream stream = StaticResourcesFileHandler.class.getClassLoader().getResourceAsStream(WEBASSETS_DIRECTORY + path);
if (stream == null) {
log.debug("Resource '{}' not found in classpath.", path);
return new byte[0];
}
final byte[] response = IOUtils.toByteArray(stream);
log.debug("Sending reply; {} bytes", response.length);
return response;
}
@Nullable
private static String getMimeType(@NonNull final String path) {
if (path.endsWith(".html")) {
return "text/html";
}
if (path.endsWith(".css")) {
return "text/css";
}
return null;
}
@Override
public void handle(@NonNull final HttpExchange exchange) throws IOException {
this.executorService.submit(() -> {
try {
final URI requestURI = exchange.getRequestURI();
final String path = requestURI.getPath();
log.debug("Handling request to {}", path);
if ("/".equals(path)) {
redirect(exchange, "index.html");
return;
}
if (!path.startsWith("/")) {
notFound(exchange, path);
return;
}
final String mimeType = getMimeType(path);
if (mimeType == null) {
notFound(exchange, path);
return;
}
final byte[] responseBytes = getBytes(path);
if (responseBytes.length == 0) {
notFound(exchange, path);
return;
}
log.debug("Serving {}{} with mimetype {}: {} bytes", WEBASSETS_DIRECTORY, path, mimeType, responseBytes.length);
exchange.getResponseHeaders().add("Content-type", mimeType);
exchange.sendResponseHeaders(200, 0);
exchange.getResponseBody().write(responseBytes);
exchange.getResponseBody().flush();
} catch (Exception e) {
log.error("FSCK!", e);
} finally {
exchange.close();
}
});
}
}

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@ -0,0 +1,39 @@
package ch.fritteli.labyrinth.server.handler;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.StatusCodes;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.MDC;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.UUID;
@Slf4j
public abstract class AbstractHttpHandler implements HttpHandler {
@Override
public final void handleRequest(@NonNull final HttpServerExchange exchange) {
final Instant start = Instant.now();
try (final MDC.MDCCloseable closeable = MDC.putCloseable("correlationId", UUID.randomUUID().toString())) {
if (exchange.isInIoThread()) {
log.debug("Dispatching request");
exchange.dispatch(this);
return;
}
try {
this.handle(exchange);
} catch (@NonNull final Exception e) {
log.error("Error handling request", e);
exchange.setStatusCode(StatusCodes.INTERNAL_SERVER_ERROR)
.getResponseSender()
.send(StatusCodes.INTERNAL_SERVER_ERROR_STRING);
}
log.debug("Completed request in {}ms.", start.until(Instant.now(), ChronoUnit.MILLIS));
}
}
protected abstract void handle(@NonNull final HttpServerExchange exchange) throws Exception;
}

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@ -0,0 +1,76 @@
package ch.fritteli.labyrinth.server.handler;
import ch.fritteli.labyrinth.generator.model.Labyrinth;
import ch.fritteli.labyrinth.server.OutputType;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.Headers;
import io.undertow.util.HttpString;
import io.undertow.util.StatusCodes;
import io.vavr.Tuple2;
import io.vavr.control.Try;
import java.nio.ByteBuffer;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.Deque;
import java.util.Map;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.MDC;
@Slf4j
public class CreateHandler extends AbstractHttpHandler {
public static final String PATH_TEMPLATE = "/create/{output}";
@Override
protected void handle(@NonNull final HttpServerExchange exchange) {
final Instant start = Instant.now();
log.debug("Handling create request");
this.createLabyrinthFromRequestParameters(exchange.getQueryParameters())
.onFailure(e -> {
log.error("Error creating Labyrinth from request", e);
exchange.setStatusCode(StatusCodes.INTERNAL_SERVER_ERROR)
.setReasonPhrase(StatusCodes.INTERNAL_SERVER_ERROR_STRING)
.getResponseSender()
.send(e.getMessage());
})
.forEach(tuple -> {
final OutputType outputType = tuple._1();
final Labyrinth labyrinth = tuple._2();
final byte[] bytes;
try {
bytes = outputType.render(labyrinth);
} catch (@NonNull final Exception e) {
log.error("Error rendering Labyrinth", e);
exchange.setStatusCode(StatusCodes.INTERNAL_SERVER_ERROR)
.setReasonPhrase(StatusCodes.INTERNAL_SERVER_ERROR_STRING)
.getResponseSender()
.send("Error creating the Labyrinth. Please contact the administrator. Request id=%s".formatted(MDC.get("correlationId")));
return;
}
final long durationMillis = start.until(Instant.now(), ChronoUnit.MILLIS);
exchange.getResponseHeaders()
.put(Headers.CONTENT_TYPE, outputType.getContentType())
.put(HttpString.tryFromString("X-Labyrinth-ID"), String.valueOf(labyrinth.getRandomSeed()))
.put(HttpString.tryFromString("X-Labyrinth-Width"), String.valueOf(labyrinth.getWidth()))
.put(HttpString.tryFromString("X-Labyrinth-Height"), String.valueOf(labyrinth.getHeight()))
.put(HttpString.tryFromString("X-Labyrinth-Generation-Duration-millis"), String.valueOf(durationMillis));
if (outputType.isAttachment()) {
exchange.getResponseHeaders()
.put(Headers.CONTENT_DISPOSITION, "attachment; filename=\"labyrinth-%dx%d-%d.%s\"".formatted(
labyrinth.getWidth(),
labyrinth.getHeight(),
labyrinth.getRandomSeed(),
outputType.getFileExtension()
));
}
exchange.getResponseSender().send(ByteBuffer.wrap(bytes));
log.debug("Create request handled in {}ms.", durationMillis);
});
}
@NonNull
private Try<Tuple2<OutputType, Labyrinth>> createLabyrinthFromRequestParameters(final Map<String, Deque<String>> queryParameters) {
return new ParametersToLabyrinthExtractor(queryParameters).createLabyrinth();
}
}

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@ -0,0 +1,55 @@
package ch.fritteli.labyrinth.server.handler;
import ch.fritteli.labyrinth.generator.model.Labyrinth;
import ch.fritteli.labyrinth.server.OutputType;
import io.vavr.Tuple;
import io.vavr.Tuple2;
import io.vavr.collection.Stream;
import io.vavr.control.Option;
import io.vavr.control.Try;
import java.util.Deque;
import java.util.Map;
import java.util.Random;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
@RequiredArgsConstructor
class ParametersToLabyrinthExtractor {
@NonNull
private final Map<String, Deque<String>> queryParameters;
@NonNull
Try<Tuple2<OutputType, Labyrinth>> createLabyrinth() {
final Option<OutputType> output = getParameterValue(RequestParameter.OUTPUT);
final Option<Integer> width = getParameterValue(RequestParameter.WIDTH);
final Option<Integer> height = getParameterValue(RequestParameter.HEIGHT);
final Option<Long> id = getParameterValue(RequestParameter.ID);
if (output.isEmpty()) {
return Try.failure(new IllegalArgumentException("Path parameter %s is required and must be one of: %s".formatted(
RequestParameter.OUTPUT.getNames().mkString("'", " / ", "'"),
Stream.of(OutputType.values())
.flatMap(OutputType::getNames)
.mkString(", ")
)));
}
if (width.isEmpty()) {
return Try.failure(new IllegalArgumentException("Query parameter %s is required and must be a positive integer value".formatted(
RequestParameter.WIDTH.getNames().mkString("'", " / ", "'")
)));
}
if (height.isEmpty()) {
return Try.failure(new IllegalArgumentException("Query parameter %s is required and must be a positive integer value".formatted(
RequestParameter.HEIGHT.getNames().mkString("'", " / ", "'")
)));
}
return Try.of(() -> Tuple.of(output.get(), new Labyrinth(width.get(), height.get(), id.getOrElse(() -> new Random().nextLong()))));
}
@NonNull
private <T> Option<T> getParameterValue(@NonNull final RequestParameter parameter) {
return parameter.getParameterValue(this.queryParameters);
}
}

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@ -0,0 +1,60 @@
package ch.fritteli.labyrinth.server.handler;
import ch.fritteli.labyrinth.generator.model.Labyrinth;
import ch.fritteli.labyrinth.generator.serialization.SerializerDeserializer;
import ch.fritteli.labyrinth.server.OutputType;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.HeaderValues;
import io.undertow.util.Headers;
import io.undertow.util.StatusCodes;
import java.nio.ByteBuffer;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
@Slf4j
public class RenderHandler extends AbstractHttpHandler {
public static final String PATH_TEMPLATE = "/render/{output}";
@Override
public void handle(final HttpServerExchange exchange) {
log.debug("Handling render request");
if (exchange.isInIoThread()) {
exchange.dispatch(this);
return;
}
exchange.getRequestReceiver().receiveFullBytes((httpServerExchange, bytes) -> {
final OutputType output = this.getOutputType(httpServerExchange);
final byte[] render;
try {
final Labyrinth labyrinth = SerializerDeserializer.deserialize(bytes);
render = output.render(labyrinth);
} catch (final Exception e) {
log.error("Error rendering binary labyrinth data", e);
httpServerExchange.setStatusCode(StatusCodes.INTERNAL_SERVER_ERROR)
.getResponseSender()
.send("Error rendering labyrinth: %s".formatted(e.getMessage()));
return;
}
httpServerExchange
.setStatusCode(StatusCodes.OK)
.getResponseHeaders()
.put(Headers.CONTENT_TYPE, output.getContentType());
httpServerExchange.getResponseSender()
.send(ByteBuffer.wrap(render));
});
}
@NonNull
private OutputType getOutputType(@NonNull final HttpServerExchange httpServerExchange) {
return RequestParameter.OUTPUT.<OutputType>getParameterValue(httpServerExchange.getQueryParameters())
.getOrElse(() -> {
final HeaderValues accept = httpServerExchange.getRequestHeaders().get(Headers.ACCEPT);
if (accept.contains(OutputType.HTML.getContentType())) {
return OutputType.HTML;
}
return OutputType.TEXT_PLAIN;
});
}
}

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@ -0,0 +1,54 @@
package ch.fritteli.labyrinth.server.handler;
import ch.fritteli.labyrinth.server.OutputType;
import io.vavr.Tuple2;
import io.vavr.collection.HashMap;
import io.vavr.collection.HashSet;
import io.vavr.collection.Set;
import io.vavr.control.Option;
import io.vavr.control.Try;
import java.util.Deque;
import java.util.Map;
import java.util.function.Function;
import lombok.Getter;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
@Slf4j
enum RequestParameter {
WIDTH(p -> Try.of(() -> Integer.parseInt(p))
.toOption()
.onEmpty(() -> log.debug("Unparseable value for parameter 'width': '{}'", p)), "w", "width"),
HEIGHT(p -> Try.of(() -> Integer.parseInt(p))
.toOption()
.onEmpty(() -> log.debug("Unparseable value for parameter 'height': '{}'", p)), "h", "height"),
ID(p -> Try.of(() -> Long.parseLong(p))
.toOption()
.onEmpty(() -> log.debug("Unparseable value for parameter 'id': '{}'", p)), "i", "id"),
OUTPUT(p -> OutputType.ofString(p)
.onEmpty(() -> log.debug("Unparseable value for parameter 'output': '{}'", p)), "o", "output");
@NonNull
private final Function<String, Option<?>> extractor;
@Getter
@NonNull
private final Set<String> names;
RequestParameter(@NonNull final Function<String, Option<?>> extractor, @NonNull final String... names) {
this.extractor = extractor;
this.names = HashSet.of(names);
}
@NonNull
Option<?> extractParameterValue(@NonNull final String parameter) {
return this.extractor.apply(parameter);
}
@NonNull
public <T> Option<T> getParameterValue(@NonNull final Map<String, Deque<String>> queryParameters) {
return (Option<T>) HashMap.ofAll(queryParameters)
.filterKeys(this.names::contains)
.flatMap(Tuple2::_2)
.flatMap(this::extractParameterValue)
.headOption();
}
}

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@ -6,12 +6,12 @@
<!-- encoders are by default assigned the type <!-- encoders are by default assigned the type
ch.qos.logback.classic.encoder.PatternLayoutEncoder --> ch.qos.logback.classic.encoder.PatternLayoutEncoder -->
<encoder> <encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern> <pattern>%d{HH:mm:ss.SSS} %-5level %X{correlationId} [%thread] %logger{36} - %msg%n</pattern>
</encoder> </encoder>
</appender> </appender>
<root level="info"> <root level="info">
<appender-ref ref="STDOUT"/> <appender-ref ref="STDOUT"/>
</root> </root>
<logger name="ch.fritteli.labyrinth.server.StaticResourcesFileHandler" level="debug"/> <logger name="ch.fritteli.labyrinth.*" level="debug"/>
</configuration> </configuration>

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@ -1,33 +0,0 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Labyrinth Generator</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="content">
<h1>Labyrinth Generator</h1>
<p>Enter some values, click the "Create!" button and see what happens!</p>
<form action="/create" method="get">
<div class="inputs-wrapper">
<label for="width">Width:</label><input id="width" name="width" type="number" min="1" required>
<label for="height">Height:</label><input id="height" name="height" type="number" min="1" required>
<label for="output">Output format:</label>
<select id="output" name="output" required>
<option label="HTML Document" value="html"></option>
<option label="Plain text" value="text"></option>
<option label="PDF Document" value="pdf"></option>
<option label="PDF Document (Download)" value="pdffile"></option>
<option label="Binary" value="binary"></option>
</select>
<label for="id">Seed (optional):</label><input id="id" name="id" type="number">
</div>
<div class="controls-wrapper">
<button type="submit" class="primary">Create!</button>
<button type="reset">Reset form</button>
</div>
</form>
</div>
</body>
</html>

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@ -1,51 +0,0 @@
:root {
--color-background: #181a1b;
--color-foreground: #e8e6e3;
--color-border: #5d6164;
--color-background-highlight: #292b2c;
--color-foreground-highlight: #f8f7f4;
--color-border-highlight: #6e7275;
}
body {
display: flex;
font-family: sans-serif;
justify-content: center;
}
body, button, input, select {
background-color: var(--color-background);
color: var(--color-foreground);
}
button, input, select {
border: 1px solid var(--color-border);
}
button:active, input:active, select:active,
button:focus, input:focus, select:focus,
button:hover, input:hover, select:hover {
background-color: var(--color-background-highlight);
border-color: var(--color-border-highlight);
color: var(--color-foreground-highlight);
}
button.primary {
background-color: #ffcc00;
border-color: #eebb00;
color: var(--color-background);
}
.content {
width: 75%;
}
.content h1 {
text-align: center;
}
.inputs-wrapper {
display: grid;
grid-row-gap: 1em;
grid-template-columns: 0.5fr 1fr;
}