Edit Migration and Migrator to make embedded migrations possible

sqlx-core/src/migrate/migration.rs

@@ -2,18 +2,8 @@ use std::borrow::Cow;
 
 #[derive(Debug, Clone)]
 pub struct Migration {
-    pub(crate) version: i64,
-    pub(crate) description: Cow<'static, str>,
-    pub(crate) sql: Cow<'static, str>,
-    pub(crate) checksum: Cow<'static, [u8]>,
-}
-
-impl Migration {
-    pub fn version(&self) -> i64 {
-        self.version
-    }
-
-    pub fn description(&self) -> &str {
-        &*self.description
-    }
+    pub version: i64,
+    pub description: Cow<'static, str>,
+    pub sql: Cow<'static, str>,
+    pub checksum: Cow<'static, [u8]>,
 }

sqlx-core/src/migrate/migrator.rs

@@ -1,11 +1,12 @@
 use crate::acquire::Acquire;
 use crate::migrate::{Migrate, MigrateError, Migration, MigrationSource};
+use std::borrow::Cow;
 use std::ops::Deref;
 use std::slice;
 
 #[derive(Debug)]
 pub struct Migrator {
-    migrations: Vec<Migration>,
+    migrations: Cow<'static, [Migration]>,
 }
 
 impl Migrator {
@@ -31,10 +32,17 @@ impl Migrator {
         S: MigrationSource<'s>,
     {
         Ok(Self {
-            migrations: source.resolve().await.map_err(MigrateError::Source)?,
+            migrations: Cow::Owned(source.resolve().await.map_err(MigrateError::Source)?),
         })
     }
 
+    /// Creates a new instance from a static slice of migrations.
+    pub async fn from_static(migrations: &'static [Migration]) -> Self {
+        Self {
+            migrations: Cow::Borrowed(migrations),
+        }
+    }
+
     /// Get an iterator over all known migrations.
     pub fn iter(&self) -> slice::Iter<'_, Migration> {
         self.migrations.iter()