From b985e8023a488e730f5cea34d0ce478e87331248 Mon Sep 17 00:00:00 2001
From: Bastian Gruber <foreach@me.com>
Date: Thu, 11 May 2023 21:18:01 +0200
Subject: [PATCH] chapter 2

---
 02-unique-id/Cargo.lock  | 67 +++++++++++++++++++++++++++++++++++++++-
 02-unique-id/Cargo.toml  |  3 +-
 02-unique-id/src/main.rs | 20 +++++++-----
 3 files changed, 80 insertions(+), 10 deletions(-)

diff --git a/02-unique-id/Cargo.lock b/02-unique-id/Cargo.lock
index 0529ce7..70e486c 100644
--- a/02-unique-id/Cargo.lock
+++ b/02-unique-id/Cargo.lock
@@ -27,12 +27,30 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
-name = "ch01-echo"
+name = "ch02-unique-id"
 version = "0.1.0"
 dependencies = [
  "serde",
  "serde_json",
  "tokio",
+ "uuid7",
+]
+
+[[package]]
+name = "fstr"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a895bfe2e678995fb741d6d10408c6aedc97f1aa9ec2adcee70aa3680e4c661c"
+
+[[package]]
+name = "getrandom"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
 ]
 
 [[package]]
@@ -126,6 +144,12 @@ version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.56"
@@ -144,6 +168,36 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.2.16"
@@ -268,6 +322,17 @@ version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
 
+[[package]]
+name = "uuid7"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "233c7c9ee8049145cc83112419ba2bada98784672ca31ce4cf49e7360397277e"
+dependencies = [
+ "fstr",
+ "rand",
+ "serde",
+]
+
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
diff --git a/02-unique-id/Cargo.toml b/02-unique-id/Cargo.toml
index 451f469..c60d3b9 100644
--- a/02-unique-id/Cargo.toml
+++ b/02-unique-id/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "ch01-echo"
+name = "ch02-unique-id"
 version = "0.1.0"
 edition = "2021"
 
@@ -9,3 +9,4 @@ edition = "2021"
 tokio = {version = "1", features = ["full"]}
 serde = {version = "1", features = ["derive"] }
 serde_json = "1"
+uuid7 = { version = "0.6.2", features = ["serde"] }
\ No newline at end of file
diff --git a/02-unique-id/src/main.rs b/02-unique-id/src/main.rs
index 52b1765..0b643d3 100644
--- a/02-unique-id/src/main.rs
+++ b/02-unique-id/src/main.rs
@@ -1,5 +1,6 @@
 use serde::{Deserialize, Serialize};
 use std::io::{self, BufRead, Write};
+use uuid7::Uuid;
 
 #[derive(Serialize, Deserialize, Debug)]
 struct Message {
@@ -19,13 +20,15 @@ enum Body {
     },
     #[serde(rename = "init_ok")]
     InitOk { in_reply_to: u64 },
-    #[serde(rename = "echo")]
-    Echo { msg_id: u64, echo: String },
-    #[serde(rename = "echo_ok")]
-    EchoOk {
+    #[serde(rename = "generate")]
+    Generate {
+        msg_id: u64,
+    },
+    #[serde(rename = "generate_ok")]
+    GenerateOk {
         msg_id: u64,
         in_reply_to: u64,
-        echo: String,
+        id: Uuid,
     },
     #[serde(rename = "error")]
     Error {
@@ -60,14 +63,15 @@ fn main() {
                 writeln!(stdout, "{}", output_json).unwrap();
                 stdout.flush().unwrap();
             }
-            Body::Echo { msg_id, echo } => {
+            Body::Generate { msg_id, .. } => {
+                let uuid = uuid7::uuid7();
                 let output = Message {
                     src: node_id.clone(),
                     dest: input.src,
-                    body: Body::EchoOk {
+                    body: Body::GenerateOk {
                         msg_id,
                         in_reply_to: msg_id,
-                        echo,
+                        id: uuid,
                     },
                 };
                 let output_json = serde_json::to_string(&output).unwrap();