copy from ghmagazine#2

Author: denjiry

asyncawaitch11/log-collector/.env

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+DATABASE_URL=postgresql://postgres:password@localhost:5432/log_collector
+

asyncawaitch11/log-collector/.gitignore

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+# コンパイラが生成する成果物や中間ファイルが置かれる
+target/

asyncawaitch11/log-collector/Cargo.lock

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+[workspace]
+members = ["server", "api", "cli"]

asyncawaitch11/log-collector/Cargo.toml

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+[package]
+name = "api"
+version = "0.1.0"
+authors = ["Rust Bicycle Book <bicycle-book@example.com>"]
+edition = "2018"
+
+[dependencies]
+serde = "1.0.8"
+serde_derive = "1.0.8"
+
+[dependencies.chrono]
+features = ["serde"]
+version = "0.4.0"
+

asyncawaitch11/log-collector/api/Cargo.toml

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+use chrono::{DateTime, Utc};
+use serde_derive::*;
+// JSONの {"user_agent": "xxx", "response_time": 0, "timestamp": "yyyy-MM-dd+HH:mm:ss"}に対応
+// 返り値で使うログはtimestampが`Option`ではない
+#[derive(Debug, Clone, Eq, PartialEq, Hash, Deserialize, Serialize)]
+pub struct Log {
+    pub user_agent: String,
+    pub response_time: i32,
+    pub timestamp: DateTime<Utc>,
+}
+
+// クエリパラメータの `?from=yyyy-MM-dd+HH:mm:ss&until=yyyy-MM-dd+HH:mm:ss` に対応
+#[derive(Debug, Clone, Eq, PartialEq, Hash, Deserialize, Serialize)]
+pub struct DateTimeRange {
+    pub from: Option<DateTime<Utc>>,
+    pub until: Option<DateTime<Utc>>,
+}
+
+pub mod csv {
+    pub mod get {
+        use crate::DateTimeRange;
+
+        pub type Query = DateTimeRange;
+        // getははファイルを返すのでResponse型の定義がない
+    }
+
+    pub mod post {
+        use serde_derive::*;
+
+        // CSVファイルを受け付けるのでリクエストデータはない
+        #[derive(Debug, Clone, Eq, PartialEq, Hash, Default, Deserialize, Serialize)]
+        // 受領したログの数を返す
+        pub struct Response(pub usize);
+    }
+}
+
+pub mod logs {
+    pub mod get {
+        use crate::{DateTimeRange, Log};
+        use serde_derive::*;
+
+        pub type Query = DateTimeRange;
+
+        #[derive(Debug, Clone, Eq, PartialEq, Hash, Default, Deserialize, Serialize)]
+        // 保存しているログをすべて返す
+        pub struct Response(pub Vec<Log>);
+    }
+
+    pub mod post {
+        use chrono::{DateTime, Utc};
+        use serde_derive::*;
+
+        // 説明した通りのデータを受け付ける
+        #[derive(Debug, Clone, Eq, PartialEq, Hash, Default, Deserialize, Serialize)]
+        pub struct Request {
+            pub user_agent: String,
+            pub response_time: i32,
+            pub timestamp: Option<DateTime<Utc>>,
+        }
+        // Acceptedを返すのでResponseデータ型の定義はない
+    }
+
+}

asyncawaitch11/log-collector/api/src/lib.rs

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+[package]
+name = "cli"
+version = "0.1.0"
+authors = ["Rust Bicycle Book <bicycle-book@example.com>"]
+edition = "2018"
+
+[dependencies]
+clap = "2"
+reqwest = "0.9"
+csv = "1"
+serde = "1"
+serde_json = "1"
+api = {path = "../api"}
+
+
+[dependencies.chrono]
+features = ["serde"]
+version = "0.4"

asyncawaitch11/log-collector/cli/Cargo.toml

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+use clap::{App, AppSettings, Arg, SubCommand};
+use clap::{_clap_count_exprs, arg_enum};
+use reqwest::Client;
+use std::io;
+
+arg_enum! {
+    #[derive(Debug)]
+    enum Format {
+        Csv,
+        Json,
+    }
+}
+
+struct ApiClient {
+    server: String,
+    client: Client,
+}
+
+impl ApiClient {
+    fn post_logs(&self, req: &api::logs::post::Request) -> reqwest::Result<()> {
+        self.client
+            .post(&format!("http://{}/logs", &self.server))
+            .json(req)
+            .send()
+            .map(|_| ())
+    }
+
+    fn get_logs(&self) -> reqwest::Result<api::logs::get::Response> {
+        self.client
+            .get(&format!("http://{}/logs", &self.server))
+            .send()?
+            .json()
+    }
+
+    fn get_csv<W: io::Write>(&self, w: &mut W) -> reqwest::Result<u64> {
+        self.client
+            .get(&format!("http://{}/csv", &self.server))
+            .send()?
+            .copy_to(w)
+    }
+}
+
+fn do_post_csv(api_client: &ApiClient) {
+    let reader = csv::Reader::from_reader(io::stdin());
+    for log in reader.into_deserialize::<api::logs::post::Request>() {
+        let log = match log {
+            Ok(log) => log,
+            Err(e) => {
+                eprintln!("[WARN] failed to parse a line, skipping: {}", e);
+                continue;
+            }
+        };
+        api_client.post_logs(&log).expect("api request failed");
+    }
+}
+
+fn do_get_json(api_client: &ApiClient) {
+    let res = api_client.get_logs().expect("api request failed");
+    let json_str = serde_json::to_string(&res).unwrap();
+    println!("{}", json_str);
+}
+
+fn do_get_csv(api_client: &ApiClient) {
+    let out = io::stdout();
+    let mut out = out.lock();
+    api_client.get_csv(&mut out).expect("api request failed");
+}
+
+fn main() {
+    let opts = App::new(env!("CARGO_PKG_NAME"))
+        .about(env!("CARGO_PKG_DESCRIPTION"))
+        .version(env!("CARGO_PKG_VERSION"))
+        .author(env!("CARGO_PKG_AUTHORS"))
+        // 以上がほぼテンプレート
+        .setting(AppSettings::SubcommandRequiredElseHelp)
+        // -s URL | --server URL のオプションを受け付ける
+        .arg(
+            Arg::with_name("SERVER")
+                .short("s")
+                .long("server")
+                .value_name("URL")
+                .help("server url")
+                .takes_value(true),
+        )
+        // サブコマンドとして `post` を受け付ける
+        .subcommand(SubCommand::with_name("post").about("post logs, taking input from stdin"))
+        // サブコマンドとして `get` を受け付ける
+        .subcommand(
+            SubCommand::with_name("get").about("get logs").arg(
+                Arg::with_name("FORMAT")
+                    .help("log format")
+                    .short("f")
+                    .long("format")
+                    .takes_value(true)
+                    // "csv", "json" のみを受け付ける
+                    .possible_values(&Format::variants())
+                    .case_insensitive(true),
+            ),
+        );
+    let matches = opts.get_matches();
+
+    let server = matches
+        .value_of("SERVER")
+        .unwrap_or("localhost:3000")
+        // .into()が増えた
+        .into();
+    let client = Client::new();
+    let api_client = ApiClient { server, client };
+
+    match matches.subcommand() {
+        ("get", sub_match) => {
+            let format = sub_match
+                .and_then(|m| m.value_of("FORMAT"))
+                .map(|m| m.parse().unwrap())
+                .unwrap();
+            match format {
+                Format::Csv => do_get_csv(&api_client),
+                Format::Json => do_get_json(&api_client),
+            }
+        }
+        ("post", _) => do_post_csv(&api_client),
+        _ => unreachable!(),
+    }
+}

asyncawaitch11/log-collector/cli/src/main.rs

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+# いろいろ書かれていますが、ローカルホストの5432番ポートにユーザ名postgres、パスワードpasswordのデータベースサーバを立てる設定です
+postgres-data:
+  image: busybox
+  volumes:
+    - /var/lib/postgresql/log-collector-data
+  container_name: log-collector-postgres-datastore
+
+postgresql:
+  image: postgres
+  environment:
+    POSTGRES_USER: postgres
+    POSTGRES_PASSWORD: password
+  ports:
+    - "5432:5432"
+  volumes_from:
+    - postgres-data

asyncawaitch11/log-collector/docker-compose.yml

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+[package]
+name = "server"
+version = "0.1.0"
+authors = ["Rust Bicycle Book <bicycle-book@example.com>"]
+edition = "2018"
+
+[dependencies]
+env_logger = "0.6"
+log = "0.4"
+actix-web = "0.7"
+failure = "0.1"
+api = {path = "../api"}
+dotenv = "0.13"
+chrono = "0.4"
+csv = "1"
+actix-web-multipart-file = "0.1"
+futures = "0.1"
+itertools = "0.8"
+
+[dependencies.diesel]
+features = ["postgres", "chrono", "r2d2"]
+version = "1.4"