Merge pull request #20 from codecrafters-io/add-cpp-support

CC-1485: Add C++ support for Kafka

compiled_starters/cpp/.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
+
+cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake
+cmake --build ./build

compiled_starters/cpp/.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 $(dirname $0)/build/kafka "$@"

compiled_starters/cpp/.gitattributes

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

compiled_starters/cpp/.gitignore

@@ -0,0 +1,55 @@
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+build
+vcpkg_installed

compiled_starters/cpp/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.13)
+
+project(codecrafters-kafka)
+
+set(CMAKE_CXX_STANDARD 23) # Enable the C++23 standard
+
+file(GLOB_RECURSE SOURCE_FILES src/*.cpp src/*.hpp)
+
+add_executable(kafka ${SOURCE_FILES})

compiled_starters/cpp/README.md

@@ -0,0 +1,34 @@
+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/kafka.png)
+
+This is a starting point for C++ 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.cpp`. 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 `cmake` installed locally
+1. Run `./your_program.sh` to run your Kafka broker, which is implemented in
+   `src/main.cpp`.
+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/cpp/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 C++ version used to run your code
+# on Codecrafters.
+#
+# Available versions: cpp-23
+language_pack: cpp-23

compiled_starters/cpp/src/main.cpp

@@ -0,0 +1,65 @@
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <netdb.h>
+#include <string>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+int main(int argc, char* argv[]) {
+    // Disable output buffering
+    std::cout << std::unitbuf;
+    std::cerr << std::unitbuf;
+
+    int server_fd = socket(AF_INET, SOCK_STREAM, 0);
+    if (server_fd < 0) {
+        std::cerr << "Failed to create server socket: " << std::endl;
+        return 1;
+    }
+
+    // Since the tester restarts your program quite often, setting SO_REUSEADDR
+    // ensures that we don't run into 'Address already in use' errors
+    int reuse = 1;
+    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
+        close(server_fd);
+        std::cerr << "setsockopt failed: " << std::endl;
+        return 1;
+    }
+
+    struct sockaddr_in server_addr{};
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_addr.s_addr = INADDR_ANY;
+    server_addr.sin_port = htons(9092);
+
+    if (bind(server_fd, reinterpret_cast<struct sockaddr*>(&server_addr), sizeof(server_addr)) != 0) {
+        close(server_fd);
+        std::cerr << "Failed to bind to port 9092" << std::endl;
+        return 1;
+    }
+
+    int connection_backlog = 5;
+    if (listen(server_fd, connection_backlog) != 0) {
+        close(server_fd);
+        std::cerr << "listen failed" << std::endl;
+        return 1;
+    }
+
+    std::cout << "Waiting for a client to connect...\n";
+
+    struct sockaddr_in client_addr{};
+    socklen_t client_addr_len = sizeof(client_addr);
+
+    // You can use print statements as follows for debugging, they'll be visible when running tests.
+    std::cerr << "Logs from your program will appear here!\n";
+
+    // Uncomment this block to pass the first stage
+    // 
+    // int client_fd = accept(server_fd, reinterpret_cast<struct sockaddr*>(&client_addr), &client_addr_len);
+    // std::cout << "Client connected\n";
+    // close(client_fd);
+
+    close(server_fd);
+    return 0;
+}

compiled_starters/cpp/vcpkg-configuration.json

@@ -0,0 +1,14 @@
+{
+    "default-registry": {
+        "kind": "git",
+        "baseline": "c4af3593e1f1aa9e14a560a09e45ea2cb0dfd74d",
+        "repository": "https://github.com/microsoft/vcpkg"
+    },
+    "registries": [
+        {
+            "kind": "artifact",
+            "location": "https://github.com/microsoft/vcpkg-ce-catalog/archive/refs/heads/main.zip",
+            "name": "microsoft"
+        }
+    ]
+}

compiled_starters/cpp/vcpkg.json

@@ -0,0 +1,3 @@
+{
+    "dependencies": []
+}

compiled_starters/cpp/your_program.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+#
+# Use this script to run your program LOCALLY.
+#
+# Note: Changing this script WILL NOT affect how CodeCrafters runs your program.
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit early if any commands fail
+
+# Copied from .codecrafters/compile.sh
+#
+# - Edit this to change how your program compiles locally
+# - Edit .codecrafters/compile.sh to change how your program compiles remotely
+(
+  cd "$(dirname "$0")" # Ensure compile steps are run within the repository directory
+  cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake
+  cmake --build ./build
+)
+
+# Copied from .codecrafters/run.sh
+#
+# - Edit this to change how your program runs locally
+# - Edit .codecrafters/run.sh to change how your program runs remotely
+exec $(dirname $0)/build/kafka "$@"

course-definition.yml

@@ -15,6 +15,7 @@ short_description_md: |-
 completion_percentage: 15
 
 languages:
+  - slug: "cpp"
   - slug: "gleam"
   - slug: "go"
   - slug: "java"

dockerfiles/cpp-23.Dockerfile

@@ -0,0 +1,39 @@
+# syntax=docker/dockerfile:1.7-labs
+FROM gcc:14.2.0-bookworm
+
+# Ensures the container is re-built if dependency files change
+ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="vcpkg.json,vcpkg-configuration.json"
+
+RUN apt-get update && \
+    apt-get install --no-install-recommends -y zip=3.* && \ 
+    apt-get install --no-install-recommends -y g++=4:* && \
+    apt-get install --no-install-recommends -y build-essential=12.* && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# cmake is required by vcpkg
+RUN wget --progress=dot:giga https://github.com/Kitware/CMake/releases/download/v3.30.5/cmake-3.30.5-Linux-x86_64.tar.gz && \
+    tar -xzvf cmake-3.30.5-Linux-x86_64.tar.gz && \
+    mv cmake-3.30.5-linux-x86_64/ /cmake
+
+ENV CMAKE_BIN="/cmake/bin"
+ENV PATH="${CMAKE_BIN}:$PATH"
+
+RUN git clone https://github.com/microsoft/vcpkg.git && \
+    ./vcpkg/bootstrap-vcpkg.sh -disableMetrics
+
+ENV VCPKG_ROOT="/vcpkg"
+ENV PATH="${VCPKG_ROOT}:$PATH"
+
+WORKDIR /app
+
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+RUN vcpkg install --no-print-usage
+RUN sed -i '1s/^/set(VCPKG_INSTALL_OPTIONS --no-print-usage)\n/' ${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake
+
+RUN mkdir -p /app-cached
+RUN if [ -d "/app/build" ]; then mv /app/build /app-cached; fi
+RUN if [ -d "/app/vcpkg_installed" ]; then mv /app/vcpkg_installed /app-cached/build; fi
+

solutions/cpp/01-vi6/code/.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
+
+cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake
+cmake --build ./build

solutions/cpp/01-vi6/code/.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 $(dirname $0)/build/kafka "$@"

solutions/cpp/01-vi6/code/.gitattributes

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

solutions/cpp/01-vi6/code/.gitignore

@@ -0,0 +1,55 @@
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+build
+vcpkg_installed

solutions/cpp/01-vi6/code/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.13)
+
+project(codecrafters-kafka)
+
+set(CMAKE_CXX_STANDARD 23) # Enable the C++23 standard
+
+file(GLOB_RECURSE SOURCE_FILES src/*.cpp src/*.hpp)
+
+add_executable(kafka ${SOURCE_FILES})