Cloud Run のコールドスタート時間を言語別に計測してみた（Python/Node/Go/C++/Rust）

import os

from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello_world():
    """Example Hello World route."""
    name = os.environ.get("NAME", "World")
    return f"Hello {name}!"

if __name__ == "__main__":
    app.run(debug=True, host="0.0.0.0", port=int(os.environ.get("PORT", 8080)))

import express from 'express';
const app = express();

app.get('/', (req, res) => {
  const name = process.env.NAME || 'World';
  res.send(`Hello ${name}!`);
});

const port = parseInt(process.env.PORT) || 8080;
app.listen(port, () => {
  console.log(`helloworld: listening on port ${port}`);
});

// Sample run-helloworld is a minimal Cloud Run service.
package main

import (
        "fmt"
        "log"
        "net/http"
        "os"
)

func main() {
        log.Print("starting server...")
        http.HandleFunc("/", handler)

        // Determine port for HTTP service.
        port := os.Getenv("PORT")
        if port == "" {
                port = "8080"
                log.Printf("defaulting to port %s", port)
        }

        // Start HTTP server.
        log.Printf("listening on port %s", port)
        if err := http.ListenAndServe(":"+port, nil); err != nil {
                log.Fatal(err)
        }
}

func handler(w http.ResponseWriter, r *http.Request) {
        name := os.Getenv("NAME")
        if name == "" {
                name = "World"
        }
        fmt.Fprintf(w, "Hello %s!\n", name)
}

#include <google/cloud/functions/framework.h>
#include <cstdlib>

namespace gcf = ::google::cloud::functions;

auto hello_world_http() {
  return gcf::MakeFunction([](gcf::HttpRequest const& /*request*/) {
    std::string greeting = "Hello ";
    auto const* target = std::getenv("TARGET");
    greeting += target == nullptr ? "World" : target;
    greeting += "\n";

    return gcf::HttpResponse{}
        .set_header("Content-Type", "text/plain")
        .set_payload(greeting);
  });
}

int main(int argc, char* argv[]) {
  return gcf::Run(argc, argv, hello_world_http());
}

use axum::{routing::get, Router};
use std::net::SocketAddr;

#[tokio::main]
async fn main() {
    // initialize tracing
    tracing_subscriber::fmt::init();

    // build our application with a route
    let app = Router::new()
        // `GET /` goes to `root`
        .route("/", get(root));

    // run our app with hyper
    // `axum::Server` is a re-export of `hyper::Server`
    let addr = SocketAddr::from(([0, 0, 0, 0], 8080));
    tracing::debug!("listening on {}", addr);
    axum::Server::bind(&addr)
        .serve(app.into_make_service())
        .await
        .unwrap();
}

// basic handler that responds with a static string
async fn root() -> &'static str {
    "Hello, World!"
}

# Use the official Rust image.
# https://hub.docker.com/_/rust
FROM rust

# Copy local code to the container image.
WORKDIR /usr/src/app
COPY . .

# Install production dependencies and build a release artifact.
RUN cargo build --release

# Service must listen to $PORT environment variable.
# This default value facilitates local development.
ENV PORT 8080

# Run the web service on container startup.
ENTRYPOINT ["target/release/cloud-run-rust-test"]