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‎solutions/c/01-jm1/code/.gitattributes

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* text=auto

‎solutions/c/01-jm1/code/README.md

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![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/redis.png)
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This is a starting point for C solutions to the
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["Build Your Own Redis" Challenge](https://codecrafters.io/challenges/redis).
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In this challenge, you'll build a toy Redis clone that's capable of handling
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basic commands like `PING`, `SET` and `GET`. Along the way we'll learn about
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event loops, the Redis protocol and more.
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**Note**: If you're viewing this repo on GitHub, head over to
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[codecrafters.io](https://codecrafters.io) to try the challenge.
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# Passing the first stage
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The entry point for your Redis implementation is in `app/server.c`. Study and
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uncomment the relevant code, and push your changes to pass the first stage:
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```sh
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git add .
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git commit -m "pass 1st stage" # any msg
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git push origin master
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```
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That's all!
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# Stage 2 & beyond
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Note: This section is for stages 2 and beyond.
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1. Ensure you have `gcc` installed locally
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1. Run `./spawn_redis_server.sh` to run your Redis server, which is implemented
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in `app/server.c`.
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1. Commit your changes and run `git push origin master` to submit your solution
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to CodeCrafters. Test output will be streamed to your terminal.

‎solutions/c/01-jm1/code/app/server.c

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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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int main() {
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// Disable output buffering
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setbuf(stdout, NULL);
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int server_fd, client_addr_len;
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struct sockaddr_in client_addr;
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server_fd = socket(AF_INET, SOCK_STREAM, 0);
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if (server_fd == -1) {
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printf("Socket creation failed: %s...\n", strerror(errno));
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return 1;
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}
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// Since the tester restarts your program quite often, setting SO_REUSEADDR
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// ensures that we don't run into 'Address already in use' errors
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int reuse = 1;
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if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
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printf("SO_REUSEADDR failed: %s \n", strerror(errno));
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return 1;
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}
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struct sockaddr_in serv_addr = { .sin_family = AF_INET ,
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.sin_port = htons(6379),
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.sin_addr = { htonl(INADDR_ANY) },
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};
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if (bind(server_fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) != 0) {
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printf("Bind failed: %s \n", strerror(errno));
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return 1;
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}
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int connection_backlog = 5;
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if (listen(server_fd, connection_backlog) != 0) {
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printf("Listen failed: %s \n", strerror(errno));
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return 1;
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}
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printf("Waiting for a client to connect...\n");
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client_addr_len = sizeof(client_addr);
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accept(server_fd, (struct sockaddr *) &client_addr, &client_addr_len);
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printf("Client connected\n");
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close(server_fd);
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return 0;
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}

‎solutions/c/01-jm1/code/codecrafters.yml

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# Set this to true if you want debug logs.
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#
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# These can be VERY verbose, so we suggest turning them off
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# unless you really need them.
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debug: false
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# Use this to change the C version used to run your code
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# on Codecrafters.
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#
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# Available versions: c-9.2
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language_pack: c-9.2

‎solutions/c/01-jm1/code/spawn_redis_server.sh

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#!/bin/sh
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#
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# DON'T EDIT THIS!
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#
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# CodeCrafters uses this file to test your code. Don't make any changes here!
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#
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# DON'T EDIT THIS!
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set -e
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tmpFile=$(mktemp)
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gcc app/*.c -o $tmpFile
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exec $tmpFile "$@"

‎solutions/c/01-jm1/diff/app/server.c.diff

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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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int main() {
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// Disable output buffering
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setbuf(stdout, NULL);
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- // You can use print statements as follows for debugging, they'll be visible when running tests.
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- printf("Logs from your program will appear here!\n");
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+ int server_fd, client_addr_len;
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+ struct sockaddr_in client_addr;
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- // Uncomment this block to pass the first stage
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- //
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- // int server_fd, client_addr_len;
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- // struct sockaddr_in client_addr;
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- //
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- // server_fd = socket(AF_INET, SOCK_STREAM, 0);
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- // if (server_fd == -1) {
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- // printf("Socket creation failed: %s...\n", strerror(errno));
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- // return 1;
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- // }
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- //
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- // // Since the tester restarts your program quite often, setting SO_REUSEADDR
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- // // ensures that we don't run into 'Address already in use' errors
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- // int reuse = 1;
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- // if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
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- // printf("SO_REUSEADDR failed: %s \n", strerror(errno));
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- // return 1;
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- // }
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- //
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- // struct sockaddr_in serv_addr = { .sin_family = AF_INET ,
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- // .sin_port = htons(6379),
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- // .sin_addr = { htonl(INADDR_ANY) },
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- // };
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- //
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- // if (bind(server_fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) != 0) {
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- // printf("Bind failed: %s \n", strerror(errno));
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- // return 1;
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- // }
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- //
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- // int connection_backlog = 5;
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- // if (listen(server_fd, connection_backlog) != 0) {
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- // printf("Listen failed: %s \n", strerror(errno));
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- // return 1;
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- // }
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- //
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- // printf("Waiting for a client to connect...\n");
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- // client_addr_len = sizeof(client_addr);
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- //
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- // accept(server_fd, (struct sockaddr *) &client_addr, &client_addr_len);
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- // printf("Client connected\n");
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- //
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- // close(server_fd);
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+ server_fd = socket(AF_INET, SOCK_STREAM, 0);
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+ if (server_fd == -1) {
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+ printf("Socket creation failed: %s...\n", strerror(errno));
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+ return 1;
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+ }
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+
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+ // Since the tester restarts your program quite often, setting SO_REUSEADDR
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+ // ensures that we don't run into 'Address already in use' errors
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+ int reuse = 1;
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+ if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
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+ printf("SO_REUSEADDR failed: %s \n", strerror(errno));
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+ return 1;
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+ }
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+
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+ struct sockaddr_in serv_addr = { .sin_family = AF_INET ,
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+ .sin_port = htons(6379),
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+ .sin_addr = { htonl(INADDR_ANY) },
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+ };
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+
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+ if (bind(server_fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) != 0) {
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+ printf("Bind failed: %s \n", strerror(errno));
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+ return 1;
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+ }
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+
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+ int connection_backlog = 5;
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+ if (listen(server_fd, connection_backlog) != 0) {
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+ printf("Listen failed: %s \n", strerror(errno));
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+ return 1;
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+ }
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+
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+ printf("Waiting for a client to connect...\n");
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+ client_addr_len = sizeof(client_addr);
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+
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+ accept(server_fd, (struct sockaddr *) &client_addr, &client_addr_len);
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+ printf("Client connected\n");
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+
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+ close(server_fd);
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return 0;
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}

‎solutions/c/01-jm1/explanation.md

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The entry point for your Redis implementation is in `app/server.c`.
2+
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Study and uncomment the relevant code:
4+
5+
```c
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// Uncomment this block to pass the first stage
7+
8+
int server_fd, client_addr_len;
9+
struct sockaddr_in client_addr;
10+
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server_fd = socket(AF_INET, SOCK_STREAM, 0);
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if (server_fd == -1) {
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printf("Socket creation failed: %s...\n", strerror(errno));
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return 1;
15+
}
16+
17+
// Since the tester restarts your program quite often, setting SO_REUSEADDR
18+
// ensures that we don't run into 'Address already in use' errors
19+
int reuse = 1;
20+
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
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printf("SO_REUSEADDR failed: %s \n", strerror(errno));
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return 1;
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}
24+
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struct sockaddr_in serv_addr = { .sin_family = AF_INET ,
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.sin_port = htons(6379),
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.sin_addr = { htonl(INADDR_ANY) },
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};
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if (bind(server_fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) != 0) {
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printf("Bind failed: %s \n", strerror(errno));
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return 1;
33+
}
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int connection_backlog = 5;
36+
if (listen(server_fd, connection_backlog) != 0) {
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printf("Listen failed: %s \n", strerror(errno));
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return 1;
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}
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printf("Waiting for a client to connect...\n");
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client_addr_len = sizeof(client_addr);
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accept(server_fd, (struct sockaddr *) &client_addr, &client_addr_len);
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printf("Client connected\n");
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close(server_fd);
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```
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Push your changes to pass the first stage:
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```
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git add .
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git commit -m "pass 1st stage" # any msg
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git push origin master
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```

‎solutions/clojure/01-jm1/code/.gitattributes

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* text=auto

‎solutions/clojure/01-jm1/code/.gitignore

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pom.xml
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pom.xml.asc
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*.jar
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*.class
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/lib/
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/classes/
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/target/
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/checkouts/
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.lein-deps-sum
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.lein-repl-history
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.lein-plugins/
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.lein-failures
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.nrepl-port
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.cpcache/

‎solutions/clojure/01-jm1/code/README.md

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![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/redis.png)
2+
3+
This is a starting point for Clojure solutions to the
4+
["Build Your Own Redis" Challenge](https://codecrafters.io/challenges/redis).
5+
6+
In this challenge, you'll build a toy Redis clone that's capable of handling
7+
basic commands like `PING`, `SET` and `GET`. Along the way we'll learn about
8+
event loops, the Redis protocol and more.
9+
10+
**Note**: If you're viewing this repo on GitHub, head over to
11+
[codecrafters.io](https://codecrafters.io) to try the challenge.
12+
13+
# Passing the first stage
14+
15+
The entry point for your Redis implementation is in `src/redis/core.clj`. Study
16+
and uncomment the relevant code, and push your changes to pass the first stage:
17+
18+
```sh
19+
git add .
20+
git commit -m "pass 1st stage" # any msg
21+
git push origin master
22+
```
23+
24+
That's all!
25+
26+
# Stage 2 & beyond
27+
28+
Note: This section is for stages 2 and beyond.
29+
30+
1. Ensure you have `lein` installed locally
31+
1. Run `./spawn_redis_server.sh` to run your Redis server, which is implemented
32+
in `src/redis/core.clj`.
33+
1. Commit your changes and run `git push origin master` to submit your solution
34+
to CodeCrafters. Test output will be streamed to your terminal.

‎solutions/clojure/01-jm1/code/codecrafters.yml

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# Set this to true if you want debug logs.
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#
3+
# These can be VERY verbose, so we suggest turning them off
4+
# unless you really need them.
5+
debug: false
6+
7+
# Use this to change the Clojure version used to run your code
8+
# on Codecrafters.
9+
#
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# Available versions: clojure-1.10.3
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language_pack: clojure-1.10.3

‎solutions/clojure/01-jm1/code/project.clj

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(defproject redis "0.1.0-SNAPSHOT"
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:description "A barebones implementation of a Redis server"
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:url "http://github.com/codecrafters-io/redis-starter-clojure"
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:license {:name "MIT"
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:url "https://opensource.org/licenses/MIT"}
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:dependencies [[org.clojure/clojure "1.10.3"]]
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:main ^:skip-aot redis.core
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:target-path "target/%s"
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:profiles {:uberjar {:aot :all
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:jvm-opts ["-Dclojure.compiler.direct-linking=true"]}})

‎solutions/clojure/01-jm1/code/spawn_redis_server.sh

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#!/bin/sh
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#
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# DON'T EDIT THIS!
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#
5+
# CodeCrafters uses this file to test your code. Don't make any changes here!
6+
#
7+
# DON'T EDIT THIS!
8+
set -e
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exec lein run "$@"

‎solutions/clojure/01-jm1/code/src/redis/core.clj

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(ns redis.core
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(:gen-class))
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(require '[clojure.java.io :as io])
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(import '[java.net ServerSocket])
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(defn receive-message
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"Read a line of textual data from the given socket"
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[socket]
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(.readLine (io/reader socket)))
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(defn send-message
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"Send the given string message out over the given socket"
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[socket msg]
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(let [writer (io/writer socket)]
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(.write writer msg)
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(.flush writer)))
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(defn serve [port handler]
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(with-open [server-sock (ServerSocket. port)
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sock (.accept server-sock)]
22+
;; Since the tester restarts your program quite often, setting SO_REUSEADDR
23+
;; ensures that we don't run into 'Address already in use' errors
24+
(. server-sock (setReuseAddress true))
25+
(let [msg-in (receive-message sock)
26+
msg-out (handler msg-in)]
27+
(send-message sock msg-out))))
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29+
(defn handler
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[& args]
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"TODO: Respond with output")
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33+
(defn -main
34+
"I don't do a whole lot ... yet."
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[& args]
36+
(serve 6379 handler)
37+
)

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