Challenge #2: Unique ID Generation

02-unique-id/Makefile

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+update:
+	go install .

02-unique-id/go.mod

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+module maelstrom-unique-ids
+
+go 1.19
+
+require github.com/jepsen-io/maelstrom/demo/go v0.0.0-20230321201811-151ad3cff117

02-unique-id/go.sum

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+github.com/jepsen-io/maelstrom/demo/go v0.0.0-20230321201811-151ad3cff117 h1:B7h6hYmW+bgtHKlHJnqW6bf8mGycFSLYvZAeKIkihnU=
+github.com/jepsen-io/maelstrom/demo/go v0.0.0-20230321201811-151ad3cff117/go.mod h1:i6aVIs5AIOOaQF1lAisBm7DDeWM1Iopf+26UxjagsCU=

02-unique-id/main.go

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+package main
+
+import (
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+	"log"
+	"math/big"
+	"os"
+
+	maelstrom "github.com/jepsen-io/maelstrom/demo/go"
+)
+
+func main() {
+	n := maelstrom.NewNode()
+
+	n.Handle("generate", func(msg maelstrom.Message) error {
+		var body map[string]any
+		if err := json.Unmarshal(msg.Body, &body); err != nil {
+			return err
+		}
+
+		// generate a random number between 0 and 999999999999999999
+		randomNum, err := rand.Int(rand.Reader, big.NewInt(1000000000000000000))
+		if err != nil {
+			fmt.Println("error generating random number:", err)
+			return err
+		}
+
+		// Update the message type.
+		body["type"] = "generate_ok"
+		body["id"] = randomNum
+
+		return n.Reply(msg, body)
+	})
+
+	if err := n.Run(); err != nil {
+		log.Printf("ERROR: %s", err)
+		os.Exit(1)
+	}
+}