【Rust】github actions

.github/workflows内にymlファイルを設置し、Workflowを書く
push, pull_request, deployment, release, issues, scheduleなどのイベントがよく使われる

チュートリアルのコード

name: GitHub Actions Demo
run-name: ${{ github.actor }} is testing out GitHub Actions 🚀
on: [push]
jobs:
  Explore-GitHub-Actions:
    runs-on: ubuntu-latest
    steps:
      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
      - name: Check out repository code
        uses: actions/checkout@v4
      - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
      - name: List files in the repository
        run: |
          ls ${{ github.workspace }}
      - run: echo "🍏 This job's status is ${{ job.status }}."

### 実際に何を書くか
build
test
lint
Type

Unit Testを実行して、Clippyを確認する

name: GitHub Actions CI
run-name: Testing out 🚀
on: [push]
jobs:
  GitHub-Actions-Check:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4
      - name: List files in the repository
        run: |
          ls
      - name: Build
        run: |
          cargo build
      - name: Test
        run: |
          cargo test
      - name: Clippy
        run: |
          rustup component add clippy
          cargo clippy

【Rust】reqwest Postのレスポンス(body payload)を表示する

“{:?}”, resp だとstatusだが、resp.text().await.unwrap()とすると、bodyを表示できる。

    let mut post_url = format!("http://192.168.33.10:3000/health");
    let client = reqwest::Client::new();
    let resp = client.post(post_url)
        .header(reqwest::header::CONTENT_TYPE, "application/json")
        .json(&str)
        .send()
        .await
        .unwrap();
    println!("{:?}", resp);
    println!("{}", resp.text().await.unwrap());

Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.43s
Running `target/debug/axum`
Response { url: Url { scheme: “http”, cannot_be_a_base: false, username: “”, password: None, host: Some(Ipv4(192.168.33.10)), port: Some(3000), path: “/health”, query: None, fragment: None }, status: 200, headers: {“content-type”: “text/plain; charset=utf-8”, “content-length”: “8”, “date”: “Thu, 13 Mar 2025 13:44:24 GMT”} }
All good

【Rust】tokio::spawnのawait

下のように書くと、DNSエラーとなる。

#[tokio::main]
async fn main()  {
    let res = tokio::spawn(async move {
        let v = get_myip().await.unwrap();
        println!("{}", v);
    });    
}   

pub async fn get_myip() -> Result<String, Box<dyn std::error::Error>> {

    let ip: Ip = serde_json::from_str(&reqwest::get("https://httpbin.org/ip")
        .await?
        .text()
        .await?)?;
    Ok(ip.origin)
}

しかし、実行されるまで待って、res.await.unwrap();とすれば、エラーは解消される。

    let res = tokio::spawn(async move {
        let v = get_myip().await.unwrap();
        println!("{}", v);
    });
    res.await.unwrap();

レスポンスがないままtokio::spawnが終了してしまうからっぽい。
うーん、奥が深い… httpbin.org　に問題があるかと思ったけど、全然違った…

【Rust】websocketのreceive

echoサーバにリクエストを送り、このレスポンスが、”foo”なので、received_msgがfooだと思っていたが、

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut ws = WebSocket::connect("wss://echo.websocket.org/").await?;
    ws.send_text("foo".to_string()).await?;
    ws.receive().await?;
    if let Frame::Text { payload: received_msg, .. } =  ws.receive().await? {
        println!("{}", received_msg);
    }
    ws.close(None).await?;
    Ok(())
}

Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.60s
Running `target/debug/app`
foo

以下のように書くと、”Request served by *****”がレスポンスで帰ってくる。websocketのreceiveは以下のように書くのが正解

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut ws = WebSocket::connect("wss://echo.websocket.org/").await?;
    ws.send_text("foo".to_string()).await?;
    if let Frame::Text { payload: received_msg, .. } =  ws.receive().await? {
        println!("{}", received_msg);
    }
    ws.close(None).await?;
    Ok(())
}

Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.07s
Running `target/debug/app`
Request served by 7811941c69e658

【Rust】ファイルの上書き処理

File::createとwrite_allで元のデータは上書かれる。
例えば、元データが4行で、上書きデータが2行だった場合でも、上書き後は2行になる。

{"family":"john","first":"fox"}
{"family":"adam","first":"can"}
{"family":"john","first":"fox"}
{"family":"adam","first":"can"}

use serde::{Serialize, Deserialize};
use std::path::Path;
use std::fs::{File};
use std::io::{Write};

#[derive(Serialize, Deserialize, Clone, Debug)]
struct Name {
    family: String,
    first: String,
}

#[tokio::main]
async fn main() {

    let name1 = Name {family:"yamada".to_string(), first: "taro".to_string()};
    let name2 = Name {family:"sato".to_string(), first: "kazuki".to_string()};

    let mut vect: Vec<Name> = Vec::new();
    vect.push(name1);
    vect.push(name2);

    let file_path = format!("./data/names.txt");
    let mut file = File::create(file_path.clone()).unwrap();
    for name in vect {
        let serialized: Vec<u8> = serde_json::to_vec(&name).unwrap();
        file.write_all(&serialized).expect("write failed");
        file.write_all(b"\n").expect("write failed");
    }
    println!("done");

}  

{"family":"yamada","first":"taro"}
{"family":"sato","first":"kazuki"}

なるほどね！

【AWS/EC2】EBSを拡張した後の割り当て処理

$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 7034376 7015828 2164 100% /
tmpfs 232532 1052 231480 1% /dev/shm
tmpfs 93016 3224 89792 4% /run
tmpfs 5120 0 5120 0% /run/lock
/dev/xvda16 901520 80068 758324 10% /boot
/dev/xvda15 106832 6246 100586 6% /boot/efi
tmpfs 46504 12 46492 1% /run/user/1000

↓
EBSの設定で20GBに拡張します。
$ sudo growpart /dev/xvda 1
$ sudo resize2fs /dev/root
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 19221248 7032216 12172648 37% /
tmpfs 232532 1052 231480 1% /dev/shm
tmpfs 93016 896 92120 1% /run
tmpfs 5120 0 5120 0% /run/lock
/dev/xvda16 901520 80068 758324 10% /boot
/dev/xvda15 106832 6246 100586 6% /boot/efi
tmpfs 46504 12 46492 1% /run/user/1000

ほう…

【ubuntu2204】error: linking with `cc` failed: exit status: 1

$ cargo run

error: linking with `cc` failed: exit status: 1
|
= note: LC_ALL=”C” PATH=”/home/ubuntu/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/ubuntu/.local/bin:/home/ubuntu/.cargo/bin:/usr/local/sbin:
//

“-nodefaultlibs”
= note: some arguments are omitted. use `–verbose` to show all linker arguments
= note: collect2: fatal error: ld terminated with signal 9 [Killed]
compilation terminated.

最後に、「collect2: fatal error: ld terminated with signal 9 [Killed]」と表示されていますが、これが、メモリ不足のエラーの模様
https://stackoverflow.com/questions/46259776/collect2-fatal-error-ld-terminated-with-signal-9-killed

swapファイルを作成すると、エラーが消えます。
$ sudo fallocate -l 1G /swapfile
$ ls -lh /swapfile
$ sudo chmod 600 /swapfile
$ sudo mkswap /swapfile
$ sudo swapon /swapfile
$ sudo swapon –show
$ free -h

【Python】error: externally-managed-environment

$ pip3 install psycopg2
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
python3-xyz, where xyz is the package you are trying to
install.

プロジェクトごとに仮想環境を作って、そこでインストールすることが推奨されている。
$ python3 -m venv venv
$ source venv/bin/activate
$ python3 -V
$ pip3 install psycopg2　
$ pip3 install python-dotenv
$ cd assets
$ python3 migration.py
$ deactivate

### 仮想環境を作らない方法
$ pip3 install psycopg2　–break-system-packages
これでもいける。

【Rust】日にち、時間差の計算

Unix Timeに変換して計算する。UnixTimeは秒単位のため、1日の場合は、60 * 60 * 24 = 86400となる。

    let utc_datetime: DateTime<Utc> = DateTime::parse_from_rfc3339("2025-01-01T00:00:00Z").unwrap().into();
    println!("{}", utc_datetime.timestamp());
    let utc_datetime2: DateTime<Utc> = DateTime::parse_from_rfc3339("2025-01-02T00:00:00Z").unwrap().into();
    println!("{}", utc_datetime2.timestamp());

    // 86400
    println!("{}", utc_datetime2.timestamp() - utc_datetime.timestamp());

Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.24s
Running `target/debug/app`
1735689600
1735776000
86400

経過時間は、unixtimeの差を86400で割れば日数となるので、

    let base_date = "2025-01-01T00:00:00Z".to_string();
    let utc_datetime: DateTime<Utc> = DateTime::parse_from_rfc3339(&base_date).unwrap().into();
    let utc_datetime2: DateTime<Utc> = Utc::now();
    println!("{}", utc_datetime2.timestamp());
    println!("{}", (utc_datetime2.timestamp() - utc_datetime.timestamp()) / 86400);

Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.67s
Running `target/debug/app`
1741587141
68

1月1日から、68日経過していることになる。