wip: db convert command

src/cli.rs

@@ -7,8 +7,9 @@ use std::path::PathBuf;
 
 use clap::{Parser, Subcommand};
 
-use crate::error;
+use crate::{config::DatabaseBackend, error};
 
+mod db;
 mod serve;
 
 /// Command line arguments
@@ -26,6 +27,10 @@ pub(crate) struct Args {
 pub(crate) enum Command {
     /// Run the server.
     Serve(ServeArgs),
+
+    /// Database utilities
+    #[clap(subcommand)]
+    Db(DbCommand),
 }
 
 /// Wrapper for the `--config` arg.
@@ -57,10 +62,37 @@ pub(crate) struct ServeArgs {
     pub(crate) config: ConfigArg,
 }
 
+#[derive(Subcommand)]
+pub(crate) enum DbCommand {
+    /// Convert between database backends
+    ///
+    /// Once this command successfully completes, copy or move the `media`
+    /// directory from `IN_PATH` to `OUT_PATH` to complete the migration.
+    Convert(DbConvert),
+}
+
+#[derive(clap::Args)]
+pub(crate) struct DbConvert {
+    /// The backend to convert from
+    in_backend: DatabaseBackend,
+
+    /// The backend to convert to
+    out_backend: DatabaseBackend,
+
+    /// Path to the database to read
+    in_path: PathBuf,
+
+    /// Path to write the new database
+    out_path: PathBuf,
+}
+
 impl Args {
     pub(crate) async fn run(self) -> Result<(), error::Main> {
         match self.command {
             Command::Serve(args) => serve::run(args).await?,
+            Command::Db(DbCommand::Convert(args)) => {
+                db::convert::run(args).await?
+            }
         }
         Ok(())
     }

src/cli/db.rs

@@ -0,0 +1 @@
+pub(crate) mod convert;

src/cli/db/convert.rs

@@ -0,0 +1,6 @@
+use crate::{cli::DbConvert, error};
+
+pub(crate) async fn run(args: DbConvert) -> Result<(), error::DbConvert> {
+    println!("hello world");
+    Ok(())
+}

src/config.rs

@@ -216,7 +216,7 @@ impl Default for TurnConfig {
     }
 }
 
-#[derive(Clone, Copy, Debug, Deserialize)]
+#[derive(Clone, Copy, Debug, Deserialize, clap::ValueEnum)]
 #[serde(rename_all = "lowercase")]
 pub(crate) enum DatabaseBackend {
     #[cfg(feature = "rocksdb")]

src/error.rs

@@ -42,6 +42,8 @@ impl fmt::Display for DisplayWithSources<'_> {
 pub(crate) enum Main {
     #[error(transparent)]
     ServeCommand(#[from] ServeCommand),
+    #[error(transparent)]
+    DbConvert(#[from] DbConvert),
 }
 
 /// Errors returned from the `serve` CLI subcommand.
@@ -161,3 +163,6 @@ pub(crate) enum Serve {
     #[error("failed to run request listener on {1}")]
     Listen(#[source] std::io::Error, ListenConfig),
 }
+
+/// Errors converting between database backends
+pub(crate) type DbConvert = Box<dyn std::error::Error>;