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use crate::acquire::Acquire;
use crate::migrate::{AppliedMigration, Migrate, MigrateError, Migration, MigrationSource};
use std::borrow::Cow;
use std::collections::{HashMap, HashSet};
use std::ops::Deref;
use std::slice;
#[derive(Debug)]
pub struct Migrator {
pub migrations: Cow<'static, [Migration]>,
pub ignore_missing: bool,
}
fn validate_applied_migrations(
applied_migrations: &[AppliedMigration],
migrator: &Migrator,
) -> Result<(), MigrateError> {
if migrator.ignore_missing {
return Ok(());
}
let migrations: HashSet<_> = migrator.iter().map(|m| m.version).collect();
for applied_migration in applied_migrations {
if !migrations.contains(&applied_migration.version) {
return Err(MigrateError::VersionMissing(applied_migration.version));
}
}
Ok(())
}
impl Migrator {
pub async fn new<'s, S>(source: S) -> Result<Self, MigrateError>
where
S: MigrationSource<'s>,
{
Ok(Self {
migrations: Cow::Owned(source.resolve().await.map_err(MigrateError::Source)?),
ignore_missing: false,
})
}
pub fn set_ignore_missing(&mut self, ignore_missing: bool) -> &Self {
self.ignore_missing = ignore_missing;
self
}
pub fn iter(&self) -> slice::Iter<'_, Migration> {
self.migrations.iter()
}
pub async fn run<'a, A>(&self, migrator: A) -> Result<(), MigrateError>
where
A: Acquire<'a>,
<A::Connection as Deref>::Target: Migrate,
{
let mut conn = migrator.acquire().await?;
conn.lock().await?;
conn.ensure_migrations_table().await?;
let version = conn.dirty_version().await?;
if let Some(version) = version {
return Err(MigrateError::Dirty(version));
}
let applied_migrations = conn.list_applied_migrations().await?;
validate_applied_migrations(&applied_migrations, self)?;
let applied_migrations: HashMap<_, _> = applied_migrations
.into_iter()
.map(|m| (m.version, m))
.collect();
for migration in self.iter() {
if migration.migration_type.is_down_migration() {
continue;
}
match applied_migrations.get(&migration.version) {
Some(applied_migration) => {
if migration.checksum != applied_migration.checksum {
return Err(MigrateError::VersionMismatch(migration.version));
}
}
None => {
conn.apply(migration).await?;
}
}
}
conn.unlock().await?;
Ok(())
}
}