quick-e2e: Add Context and StartScriptService to manage server environment and script generation

tools/quick-e2e/src/main/java/de/oliver/quicke2e/Main.java

@@ -1,8 +1,10 @@
 package de.oliver.quicke2e;
 
 import de.oliver.quicke2e.config.Configuration;
+import de.oliver.quicke2e.config.Context;
 import de.oliver.quicke2e.eula.EulaService;
 import de.oliver.quicke2e.paper.PaperDownloadService;
+import de.oliver.quicke2e.startScript.StartScriptService;
 
 public class Main {
 
@@ -17,6 +19,8 @@ public class Main {
                 "25565"
         );
 
+        Context context = new Context(config);
+
         PaperDownloadService paper = new PaperDownloadService();
 //        paper.downloadServerFile(config.type(), config.version(), config.build());
 
@@ -24,6 +28,9 @@ public class Main {
         if (config.eula()) {
             eula.setEulaToTrue(String.format("servers/%s_%s_%s/eula.txt", config.type(), config.version(), config.build()));
         }
+
+        StartScriptService startScript = new StartScriptService();
+        startScript.writeStartScript(context);
     }
 
 }

tools/quick-e2e/src/main/java/de/oliver/quicke2e/config/Context.java

@@ -0,0 +1,57 @@
+package de.oliver.quicke2e.config;
+
+import java.nio.file.Path;
+
+public class Context {
+
+    private final Configuration configuration;
+    private String actualBuildNumber;
+    private Path serverEnvPath;
+    private Path serverJarPath;
+    private Path startScriptPath;
+
+    public Context(Configuration configuration) {
+        this.configuration = configuration;
+        this.actualBuildNumber = configuration.build();
+    }
+
+    public Configuration configuration() {
+        return configuration;
+    }
+
+    public String actualBuildNumber() {
+        return actualBuildNumber;
+    }
+
+    public void setActualBuildNumber(String actualBuildNumber) {
+        this.actualBuildNumber = actualBuildNumber;
+    }
+
+    public String serverFileName() {
+        return String.format("%s-%s-%s.jar", configuration.type(), configuration.version(), actualBuildNumber);
+    }
+
+    public Path serverEnvPath() {
+        return serverEnvPath;
+    }
+
+    public void setServerEnvPath(Path serverEnvPath) {
+        this.serverEnvPath = serverEnvPath;
+    }
+
+    public Path serverJarPath() {
+        return serverJarPath;
+    }
+
+    public void setServerJarPath(Path serverJarPath) {
+        this.serverJarPath = serverJarPath;
+    }
+
+    public Path startScriptPath() {
+        return startScriptPath;
+    }
+
+    public void setStartScriptPath(Path startScriptPath) {
+        this.startScriptPath = startScriptPath;
+    }
+}

tools/quick-e2e/src/main/java/de/oliver/quicke2e/startScript/StartScriptService.java

@@ -0,0 +1,59 @@
+package de.oliver.quicke2e.startScript;
+
+import de.oliver.quicke2e.config.Context;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.stream.Collectors;
+
+public class StartScriptService {
+
+    private String startScriptContent;
+
+    public StartScriptService() {
+        try {
+            startScriptContent = getResourceFileAsString("start.sh");
+        } catch (IOException e) {
+            startScriptContent = "echo No start script found!";
+        }
+    }
+
+    /**
+     * Reads given resource file as a string.
+     *
+     * @param fileName path to the resource file
+     * @return the file's contents
+     * @throws IOException if read fails for any reason
+     */
+    private static String getResourceFileAsString(String fileName) throws IOException {
+        ClassLoader classLoader = ClassLoader.getSystemClassLoader();
+        try (InputStream is = classLoader.getResourceAsStream(fileName)) {
+            if (is == null) return null;
+            try (InputStreamReader isr = new InputStreamReader(is);
+                 BufferedReader reader = new BufferedReader(isr)) {
+                return reader.lines().collect(Collectors.joining(System.lineSeparator()));
+            }
+        }
+    }
+
+    public boolean writeStartScript(Context context) {
+        Path startScriptPath = Path.of(String.format("%s/start.sh", context.serverEnvPath().toString()));
+
+        String content = startScriptContent
+                .replace("%SERVER_FILE%", context.serverFileName());
+
+        try {
+            Files.writeString(startScriptPath, content);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return false;
+        }
+
+        context.setStartScriptPath(startScriptPath);
+        return true;
+    }
+}

tools/quick-e2e/src/main/resources/start.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+java -Xms4096M -Xmx4096M -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+ParallelRefProcEnabled -XX:+PerfDisableSharedMem -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:G1HeapWastePercent=5 -XX:G1MaxNewSizePercent=40 -XX:G1MixedGCCountTarget=4 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1NewSizePercent=30 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:G1ReservePercent=20 -XX:InitiatingHeapOccupancyPercent=15 -XX:MaxGCPauseMillis=200 -XX:MaxTenuringThreshold=1 -XX:SurvivorRatio=32 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -jar %SERVER_FILE% nogui