use crate::error::C3p0Error;
use crate::json::codec::DefaultJsonCodec;
use crate::json::model::{Model, NewModel};
use crate::json::C3p0Json;
use crate::migrate::migration::Migrations;
use crate::migrate::sql_migration::{to_sql_migrations, SqlMigration};
use crate::pool::{C3p0Pool, SqlConnection};
use log::*;
use serde_derive::{Deserialize, Serialize};
mod md5;
pub mod migration;
mod sql_migration;
pub const C3P0_MIGRATE_TABLE_DEFAULT: &str = "C3P0_MIGRATE_SCHEMA_HISTORY";
pub const C3P0_INIT_MIGRATION_ID: &str = "C3P0_INIT_MIGRATION";
#[derive(Clone, Debug)]
pub struct C3p0MigrateBuilder<CONN: SqlConnection, C3P0: C3p0Pool<CONN = CONN>> {
pub table: String,
pub schema: Option<String>,
pub migrations: Vec<SqlMigration>,
pub c3p0: C3P0,
}
impl<CONN: SqlConnection, C3P0: C3p0Pool<CONN = CONN>> C3p0MigrateBuilder<CONN, C3P0> {
pub fn new(c3p0: C3P0) -> Self {
C3p0MigrateBuilder {
table: C3P0_MIGRATE_TABLE_DEFAULT.to_owned(),
schema: None,
migrations: vec![],
c3p0,
}
}
pub fn with_schema_name<T: Into<Option<String>>>(
mut self,
schema_name: T,
) -> C3p0MigrateBuilder<CONN, C3P0> {
self.schema = schema_name.into();
self
}
pub fn with_table_name<T: Into<String>>(
mut self,
table_name: T,
) -> C3p0MigrateBuilder<CONN, C3P0> {
self.table = table_name.into();
self
}
pub fn with_migrations<M: Into<Migrations>>(
mut self,
migrations: M,
) -> C3p0MigrateBuilder<CONN, C3P0> {
self.migrations = to_sql_migrations(migrations.into().migrations);
self
}
}
pub type MigrationModel = Model<MigrationData>;
#[derive(Clone, Serialize, Deserialize, PartialEq)]
pub struct MigrationData {
pub migration_id: String,
pub migration_type: MigrationType,
pub md5_checksum: String,
pub installed_on_epoch_ms: u64,
pub execution_time_ms: u64,
pub success: bool,
}
#[derive(Clone, Serialize, Deserialize, PartialEq)]
pub enum MigrationType {
C3P0INIT,
UP,
DOWN,
}
#[derive(Clone)]
pub struct C3p0Migrate<
CONN: SqlConnection,
C3P0: C3p0Pool<CONN = CONN>,
MIGRATOR: Migrator<CONN = CONN>,
> {
table: String,
schema: Option<String>,
migrations: Vec<SqlMigration>,
c3p0: C3P0,
migrator: MIGRATOR,
}
impl<CONN: SqlConnection, C3P0: C3p0Pool<CONN = CONN>, MIGRATOR: Migrator<CONN = CONN>>
C3p0Migrate<CONN, C3P0, MIGRATOR>
{
pub fn new(
table: String,
schema: Option<String>,
migrations: Vec<SqlMigration>,
c3p0: C3P0,
migrator: MIGRATOR,
) -> Self {
Self {
table,
schema,
migrations,
c3p0,
migrator,
}
}
pub fn migrate(&self) -> Result<(), C3p0Error> {
let c3p0_json = self
.migrator
.build_cp30_json(self.table.clone(), self.schema.clone());
self.pre_migration(&c3p0_json)
.map_err(|err| C3p0Error::MigrationError {
message: "C3p0Migrate - Failed to execute pre-migration DB preparation."
.to_string(),
cause: Box::new(err),
})?;
self.c3p0
.transaction(|conn| {
self.migrator.lock_first_migration_row(&c3p0_json, conn)?;
Ok(self.start_migration(&c3p0_json, conn)?)
})
.map_err(|err| C3p0Error::MigrationError {
message: "C3p0Migrate - Failed to execute DB migration script.".to_string(),
cause: err,
})
}
pub fn get_migrations_history(
&self,
conn: &mut MIGRATOR::CONN,
) -> Result<Vec<MigrationModel>, C3p0Error> {
let c3p0_json = self
.migrator
.build_cp30_json(self.table.clone(), self.schema.clone());
c3p0_json.fetch_all(conn)
}
fn create_migration_zero(
&self,
c3p0_json: &MIGRATOR::C3P0JSON,
conn: &mut MIGRATOR::CONN,
) -> Result<(), C3p0Error> {
let count = c3p0_json.count_all(conn)?;
if count == 0 {
let migration_zero = MigrationData {
md5_checksum: "".to_owned(),
migration_id: C3P0_INIT_MIGRATION_ID.to_owned(),
migration_type: MigrationType::C3P0INIT,
execution_time_ms: 0,
installed_on_epoch_ms: 0,
success: true,
};
c3p0_json.save(conn, migration_zero.into())?;
};
Ok(())
}
fn pre_migration(&self, c3p0_json: &MIGRATOR::C3P0JSON) -> Result<(), C3p0Error> {
{
let conn = &mut self.c3p0.connection()?;
if let Err(err) = c3p0_json.create_table_if_not_exists(conn) {
warn!("C3p0Migrate - Create table process completed with error. This 'COULD' be fine if another process attempted the same operation concurrently. Err: {}", err);
};
}
self.c3p0.transaction(|conn| {
self.migrator.lock_table(&c3p0_json, conn)?;
Ok(self.create_migration_zero(&c3p0_json, conn)?)
})
}
fn start_migration(
&self,
c3p0_json: &MIGRATOR::C3P0JSON,
conn: &mut MIGRATOR::CONN,
) -> Result<(), C3p0Error> {
let migration_history = self.fetch_migrations_history(c3p0_json, conn)?;
let migration_history = self.clean_history(migration_history)?;
for i in 0..self.migrations.len() {
let migration = &self.migrations[i];
if migration_history.len() > i {
let applied_migration = &migration_history[i];
if applied_migration.data.migration_id.eq(&migration.id) {
if applied_migration.data.md5_checksum.eq(&migration.up.md5) {
continue;
}
return Err(C3p0Error::AlteredMigrationSql {
message: format!(
"Wrong checksum for migration [{}]. Expected [{}], found [{}].",
applied_migration.data.migration_id,
applied_migration.data.md5_checksum,
migration.up.md5
),
});
}
return Err(C3p0Error::WrongMigrationSet {
message: format!(
"Wrong migration set! Expected migration [{}], found [{}].",
applied_migration.data.migration_id, migration.id
),
});
}
conn.batch_execute(&migration.up.sql)
.map_err(|err| C3p0Error::MigrationError {
message: format!(
"C3p0Migrate - Failed to execute migration with id [{}].",
&migration.id
),
cause: Box::new(err),
})?;
c3p0_json.save(
conn,
NewModel::new(MigrationData {
success: true,
md5_checksum: migration.up.md5.clone(),
migration_id: migration.id.clone(),
migration_type: MigrationType::UP,
execution_time_ms: 0,
installed_on_epoch_ms: 0,
}),
)?;
}
Ok(())
}
fn fetch_migrations_history(
&self,
c3p0_json: &MIGRATOR::C3P0JSON,
conn: &mut MIGRATOR::CONN,
) -> Result<Vec<MigrationModel>, C3p0Error> {
c3p0_json.fetch_all(conn)
}
fn clean_history(
&self,
migrations: Vec<MigrationModel>,
) -> Result<Vec<MigrationModel>, C3p0Error> {
let mut result = vec![];
for migration in migrations {
match migration.data.migration_type {
MigrationType::UP => {
result.push(migration);
}
MigrationType::DOWN => {
let last = result.remove(result.len() - 1);
if !migration.data.migration_id.eq(&last.data.migration_id)
|| !last.data.migration_type.eq(&MigrationType::UP)
{
return Err(C3p0Error::CorruptedDbMigrationState {
message: "Migration history is not valid!!".to_owned(),
});
}
}
MigrationType::C3P0INIT => {}
}
}
Ok(result)
}
}
pub trait Migrator: Clone {
type CONN: SqlConnection;
type C3P0: C3p0Pool<CONN = Self::CONN>;
type C3P0JSON: C3p0Json<MigrationData, DefaultJsonCodec, CONN = Self::CONN>;
fn build_cp30_json(&self, table: String, schema: Option<String>) -> Self::C3P0JSON;
fn lock_table(
&self,
c3p0_json: &Self::C3P0JSON,
conn: &mut Self::CONN,
) -> Result<(), C3p0Error>;
fn lock_first_migration_row(
&self,
c3p0_json: &Self::C3P0JSON,
conn: &mut Self::CONN,
) -> Result<(), C3p0Error>;
}