HTTPSERVER: Fix 2

codecrafters-http-server-go/.codecrafters/compile.sh

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+#!/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
+
+go build -o /tmp/codecrafters-build-http-server-go app/*.go

codecrafters-http-server-go/.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 /tmp/codecrafters-build-http-server-go "$@"

codecrafters-http-server-go/.gitattributes

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

codecrafters-http-server-go/README.md

@@ -0,0 +1,37 @@
+[![progress-banner](https://backend.codecrafters.io/progress/http-server/79632794-98f7-44ac-8abd-57a3a6fac4aa)](https://app.codecrafters.io/users/codecrafters-bot?r=2qF)
+
+This is a starting point for Go solutions to the
+["Build Your Own HTTP server" Challenge](https://app.codecrafters.io/courses/http-server/overview).
+
+[HTTP](https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol) is the
+protocol that powers the web. In this challenge, you'll build a HTTP/1.1 server
+that is capable of serving multiple clients.
+
+Along the way you'll learn about TCP servers,
+[HTTP request syntax](https://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html),
+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 HTTP server implementation is in `app/server.go`. 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
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `go (1.19)` installed locally
+1. Run `./your_program.sh` to run your program, which is implemented in
+   `app/server.go`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.

codecrafters-http-server-go/app/server.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strings"
+)
+
+// Ensures gofmt doesn't remove the "net" and "os" imports above (feel free to remove this!)
+var (
+	_ = net.Listen
+	_ = os.Exit
+)
+
+func main() {
+	// You can use print statements as follows for debugging, they'll be visible when running tests.
+	fmt.Println("Logs from your program will appear here!")
+
+	// Uncomment this block to pass the first stage
+
+	l, err := net.Listen("tcp", "0.0.0.0:4221")
+	if err != nil {
+		fmt.Println("Failed to bind to port 4221")
+		os.Exit(1)
+	}
+	defer l.Close()
+	conn, err := l.Accept()
+	if err != nil {
+		fmt.Println("Error accepting connection: ", err.Error())
+		os.Exit(1)
+	}
+	req := make([]byte, 1024)
+
+	conn.Read(req)
+
+	if !strings.HasPrefix(string(req), "GET / HTTP/1.1") {
+		conn.Write([]byte("HTTP/1.1 404 Not Found\r\n\r\n"))
+		conn.Close()
+		return
+	}
+	conn.Write([]byte("HTTP/1.1 200 OK\r\n\r\n"))
+}

codecrafters-http-server-go/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 Go version used to run your code
+# on Codecrafters.
+#
+# Available versions: go-1.22
+language_pack: go-1.22

codecrafters-http-server-go/go.mod

@@ -0,0 +1,11 @@
+// DON'T EDIT THIS!
+//
+// Codecrafters relies on this file being intact to run tests successfully. Any changes
+// here will not reflect when CodeCrafters tests your code, and might even cause build
+// failures.
+//
+// DON'T EDIT THIS!
+
+module github.com/codecrafters-io/http-server-starter-go
+
+go 1.22

codecrafters-http-server-go/your_program.sh

@@ -0,0 +1,24 @@
+#!/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 "$0")" # Ensure compile steps are run within the repository directory
+  go build -o /tmp/codecrafters-build-http-server-go app/*.go
+)
+
+# Copied from .codecrafters/run.sh
+#
+# - Edit this to change how your program runs locally
+# - Edit .codecrafters/run.sh to change how your program runs remotely
+exec /tmp/codecrafters-build-http-server-go "$@"

codecrafters-sqlite-go/.codecrafters/compile.sh

@@ -0,0 +1,11 @@
+#!/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
+
+go build -o /tmp/codecrafters-build-sqlite-go app/*.go

codecrafters-sqlite-go/.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 /tmp/codecrafters-build-sqlite-go "$@"

codecrafters-sqlite-go/.gitattributes

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+* text=auto

codecrafters-sqlite-go/.gitignore

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+# Database files used for testing
+*.db

codecrafters-sqlite-go/README.md

@@ -0,0 +1,76 @@
+[![progress-banner](https://backend.codecrafters.io/progress/sqlite/48f6806f-f61a-405d-aca7-6fde3bb6d8b1)](https://app.codecrafters.io/users/codecrafters-bot?r=2qF)
+
+This is a starting point for Go solutions to the
+["Build Your Own SQLite" Challenge](https://codecrafters.io/challenges/sqlite).
+
+In this challenge, you'll build a barebones SQLite implementation that supports
+basic SQL queries like `SELECT`. Along the way we'll learn about
+[SQLite's file format](https://www.sqlite.org/fileformat.html), how indexed data
+is
+[stored in B-trees](https://jvns.ca/blog/2014/10/02/how-does-sqlite-work-part-2-btrees/)
+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 SQLite implementation is in `app/main.go`. 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
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `go (1.16+)` installed locally
+1. Run `./your_program.sh` to run your program, which is implemented in
+   `app/main.go`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
+
+# Sample Databases
+
+To make it easy to test queries locally, we've added a sample database in the
+root of this repository: `sample.db`.
+
+This contains two tables: `apples` & `oranges`. You can use this to test your
+implementation for the first 6 stages.
+
+You can explore this database by running queries against it like this:
+
+```sh
+$ sqlite3 sample.db "select id, name from apples"
+1|Granny Smith
+2|Fuji
+3|Honeycrisp
+4|Golden Delicious
+```
+
+There are two other databases that you can use:
+
+1. `superheroes.db`:
+   - This is a small version of the test database used in the table-scan stage.
+   - It contains one table: `superheroes`.
+   - It is ~1MB in size.
+1. `companies.db`:
+   - This is a small version of the test database used in the index-scan stage.
+   - It contains one table: `companies`, and one index: `idx_companies_country`
+   - It is ~7MB in size.
+
+These aren't included in the repository because they're large in size. You can
+download them by running this script:
+
+```sh
+./download_sample_databases.sh
+```
+
+If the script doesn't work for some reason, you can download the databases
+directly from
+[codecrafters-io/sample-sqlite-databases](https://github.com/codecrafters-io/sample-sqlite-databases).

codecrafters-sqlite-go/app/main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	// Available if you need it!
+	// "github.com/xwb1989/sqlparser"
+)
+
+// Usage: your_program.sh sample.db .dbinfo
+func main() {
+	databaseFilePath := os.Args[1]
+	command := os.Args[2]
+
+	switch command {
+	case ".dbinfo":
+		databaseFile, err := os.Open(databaseFilePath)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		header := make([]byte, 100)
+
+		_, err = databaseFile.Read(header)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		var pageSize uint16
+		if err := binary.Read(bytes.NewReader(header[16:18]), binary.BigEndian, &pageSize); err != nil {
+			fmt.Println("Failed to read integer:", err)
+			return
+		}
+		// You can use print statements as follows for debugging, they'll be visible when running tests.
+		fmt.Println("Logs from your program will appear here!")
+
+		// Uncomment this to pass the first stage
+		fmt.Printf("database page size: %v", pageSize)
+		schemaBuffer := make([]byte, pageSize)
+
+		_, err = databaseFile.Read(schemaBuffer)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		re, _ := regexp.Compile("CREATE TABLE")
+
+		tables := re.FindAll(schemaBuffer, -1)
+
+		fmt.Printf("database page size: %v\n", pageSize)
+
+		fmt.Printf("number of tables: %v\n", len(tables))
+	default:
+		fmt.Println("Unknown command", command)
+		os.Exit(1)
+	}
+}

codecrafters-sqlite-go/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 Go version used to run your code
+# on Codecrafters.
+#
+# Available versions: go-1.22
+language_pack: go-1.22

codecrafters-sqlite-go/download_sample_databases.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+echo "Downloading superheroes.db: ~1MB (used in stage 7)"
+curl -Lo superheroes.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/superheroes.db
+
+echo "Downloading companies.db: ~7MB (used in stage 8)"
+curl -Lo companies.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/companies.db
+
+echo "Sample databases downloaded."

codecrafters-sqlite-go/go.mod

@@ -0,0 +1,13 @@
+// DON'T EDIT THIS!
+//
+// Codecrafters relies on this file being intact to run tests successfully. Any changes
+// here will not reflect when CodeCrafters tests your code, and might even cause build
+// failures.
+//
+// DON'T EDIT THIS!
+
+module github/com/codecrafters-io/sqlite-starter-go
+
+go 1.22
+
+require github.com/xwb1989/sqlparser v0.0.0-20180606152119-120387863bf2

codecrafters-sqlite-go/go.sum

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+github.com/xwb1989/sqlparser v0.0.0-20180606152119-120387863bf2 h1:zzrxE1FKn5ryBNl9eKOeqQ58Y/Qpo3Q9QNxKHX5uzzQ=
+github.com/xwb1989/sqlparser v0.0.0-20180606152119-120387863bf2/go.mod h1:hzfGeIUDq/j97IG+FhNqkowIyEcD88LrW6fyU3K3WqY=

codecrafters-sqlite-go/your_program.sh

@@ -0,0 +1,24 @@
+#!/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 "$0")" # Ensure compile steps are run within the repository directory
+  go build -o /tmp/codecrafters-build-sqlite-go app/*.go
+)
+
+# Copied from .codecrafters/run.sh
+#
+# - Edit this to change how your program runs locally
+# - Edit .codecrafters/run.sh to change how your program runs remotely
+exec /tmp/codecrafters-build-sqlite-go "$@"

codingCh/fibonacciSEQ/fibonacci.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func FibonacciLoop(n int) int {
+	f := make([]int, n+1, n+2)
+	if n < 2 {
+		f = f[0:2]
+	}
+	f[0] = 0
+	f[1] = 1
+	for i := 2; i <= n; i++ {
+		f[i] = f[i-1] + f[i-2]
+	}
+	return f[n]
+}
+
+func FionaccoRecursion(n int) int {
+	if n <= 1 {
+		return n
+	}
+	return FionaccoRecursion(n-1) + FionaccoRecursion(n-2)
+}
+
+func main() {
+	for i := 0; i <= 50; i++ {
+		fmt.Print(strconv.Itoa(FibonacciLoop(i)) + " ")
+	}
+	fmt.Println("")
+	for i := 0; i <= 50; i++ {
+		fmt.Print(strconv.Itoa(FionaccoRecursion(i)) + " ")
+	}
+	fmt.Println("")
+}

codingCh/fibonacciSEQ/go.mod

@@ -0,0 +1,3 @@
+module Fibonacci
+
+go 1.22.7