Merge pull request #97 from codecrafters-io/andy/add-scala

CC-2126: Add Scala starter code

Author: andy1li

compiled_starters/scala/.codecrafters/compile.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+# The option is needed for Java 17+ to allow native memory access operations.
+SBT_OPTS="--enable-native-access=ALL-UNNAMED --sun-misc-unsafe-memory-access=allow" sbt -error assembly

compiled_starters/scala/.codecrafters/run.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+exec java -jar "$(dirname "$0")/target/scala-3.8.2/kafka.jar" "$@"

compiled_starters/scala/.gitattributes

@@ -0,0 +1 @@
+* text=auto

compiled_starters/scala/.gitignore

@@ -0,0 +1,28 @@
+# macOS
+.DS_Store
+
+# sbt specific
+dist/*
+debug/
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+project/local-plugins.sbt
+.history
+.ensime
+.ensime_cache/
+.sbt-scripted/
+local.sbt
+
+# Bloop
+.bsp
+
+# VS Code
+.vscode/
+
+# Metals
+.bloop/
+.metals/
+metals.sbt

compiled_starters/scala/README.md

@@ -0,0 +1,35 @@
+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/kafka.png)
+
+This is a starting point for Scala solutions to the
+["Build Your Own Kafka" Challenge](https://codecrafters.io/challenges/kafka).
+
+In this challenge, you'll build a toy Kafka clone that's capable of accepting
+and responding to ApiVersions & Fetch API requests. You'll also learn about
+encoding and decoding messages using the Kafka wire protocol. You'll also learn
+about handling the network protocol, event loops, TCP sockets and more.
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your Kafka implementation is in
+`src/main/scala/codecrafters_kafka/App.scala`. Study and uncomment the relevant
+code, and push your changes to pass the first stage:
+
+```sh
+git commit -am "pass 1st stage" # any msg
+git push origin master
+```
+
+That's all!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `sbt (1.12.5)` installed locally
+1. Run `./your_program.sh` to run your Kafka broker, which is implemented in
+   `src/main/scala/codecrafters_kafka/App.scala`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.

compiled_starters/scala/build.sbt

@@ -0,0 +1,14 @@
+ThisBuild / scalaVersion     := "3.8.2"
+ThisBuild / version          := "0.1.0-SNAPSHOT"
+ThisBuild / organization     := "com.codecrafters"
+ThisBuild / organizationName := "CodeCrafters"
+
+assembly / assemblyJarName := "kafka.jar"
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "codecrafter-kafka",
+    // List your dependencies here
+    libraryDependencies ++= Seq(
+    )
+  )

compiled_starters/scala/codecrafters.yml

@@ -0,0 +1,11 @@
+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Scala version used to run your code
+# on Codecrafters.
+#
+# Available versions: scala-3.8
+buildpack: scala-3.8

compiled_starters/scala/project/assembly.sbt

@@ -0,0 +1 @@
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")

compiled_starters/scala/project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.12.5

compiled_starters/scala/src/main/scala/codecrafters_kafka/App.scala

@@ -0,0 +1,32 @@
+package codecrafters_kafka
+
+import java.io.IOException
+import java.net.{ServerSocket, Socket}
+
+object Main extends App {
+  var clientSocket: Socket = null
+  val port = 9092
+
+  try {
+    // You can use print statements as follows for debugging, they'll be visible when running tests.
+    System.err.println("Logs from your program will appear here!")
+
+    // TODO: Uncomment the code below to pass the first stage
+    // val serverSocket = new ServerSocket(port)
+    // // Since the tester restarts your program quite often, setting SO_REUSEADDR
+    // // ensures that we don't run into 'Address already in use' errors
+    // serverSocket.setReuseAddress(true)
+    // // Wait for connection from client.
+    // clientSocket = serverSocket.accept()
+  } catch {
+    case e: IOException => System.out.println("IOException: " + e.getMessage)
+  } finally {
+    try {
+      if (clientSocket != null) {
+        clientSocket.close()
+      }
+    } catch {
+      case e: IOException => System.out.println("IOException: " + e.getMessage)
+    }
+  }
+}