feat: add post3 s3 proxy for postgresql

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/post3-server/src/cli.rs

@@ -0,0 +1,58 @@
+pub mod serve;
+
+use anyhow::Context;
+use clap::{Parser, Subcommand};
+use post3::{FilesystemBackend, PostgresBackend};
+use sqlx::PgPool;
+
+use crate::state::State;
+
+#[derive(Parser)]
+#[command(name = "post3-server", about = "S3-compatible storage server")]
+struct App {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    Serve(serve::ServeCommand),
+}
+
+pub async fn execute() -> anyhow::Result<()> {
+    let app = App::parse();
+
+    match app.command {
+        Commands::Serve(cmd) => match cmd.backend {
+            serve::BackendType::Pg => {
+                let database_url =
+                    std::env::var("DATABASE_URL").context("DATABASE_URL not set")?;
+                let pool = PgPool::connect(&database_url).await?;
+
+                sqlx::migrate!("../post3/migrations/")
+                    .set_locking(false)
+                    .run(&pool)
+                    .await?;
+
+                tracing::info!("database migrations applied");
+
+                let backend = PostgresBackend::new(pool);
+                let state = State { store: backend };
+                cmd.run(&state).await
+            }
+            serve::BackendType::Fs => {
+                let data_dir = cmd
+                    .data_dir
+                    .as_ref()
+                    .context("--data-dir is required when using --backend fs")?;
+
+                std::fs::create_dir_all(data_dir)?;
+                tracing::info!(path = %data_dir.display(), "using filesystem backend");
+
+                let backend = FilesystemBackend::new(data_dir);
+                let state = State { store: backend };
+                cmd.run(&state).await
+            }
+        },
+    }
+}