@@ -5,7 +5,7 @@ use crate::{
6use anyhow::{anyhow, Context};
6use anyhow::{anyhow, Context};
7use colored::*;
7use colored::*;
8−use db::{Conn, DbConn, DbLocker};
8+use db::{Conn, DbConn};
9use postgres::Config;
9use postgres::Config;
10use schema::Table;
10use schema::Table;
@@ -15,10 +15,11 @@ pub mod migrations;
15mod schema;
15mod schema;
18−pub use crate::state::State;
18+pub use crate::state::{State, Status};
20pub struct Reshape {
20pub struct Reshape {
21− db: DbLocker,
21+ pub state: State,
24impl Reshape {
25impl Reshape {
@@ -30,7 +31,6 @@ impl Reshape {
30 pub fn new_with_options(
31 pub fn new_with_options(
31 host: &str,
32 host: &str,
32 port: u16,
33 port: u16,
34 username: &str,
34 username: &str,
35 password: &str,
35 password: &str,
36 ) -> anyhow::Result<Reshape> {
36 ) -> anyhow::Result<Reshape> {
@@ -39,488 +39,504 @@ impl Reshape {
39 .host(host)
39 .host(host)
40 .port(port)
40 .port(port)
41 .user(username)
41 .user(username)
43 .password(password);
42 .password(password);
45 Self::new_with_config(&config)
44 Self::new_with_config(&config)
48 fn new_with_config(config: &Config) -> anyhow::Result<Reshape> {
47 fn new_with_config(config: &Config) -> anyhow::Result<Reshape> {
49− let db = DbLocker::connect(config)?;
48+ let mut db = DbConn::connect(config)?;
55− migrations: impl IntoIterator<Item = Migration>,
56− ) -> anyhow::Result<()> {
58− let mut state = State::load(db)?;
49+ let state = State::load(&mut db);
59− migrate(db, &mut state, migrations)
63− pub fn complete(&mut self) -> anyhow::Result<()> {
65− let mut state = State::load(db)?;
66− complete(db, &mut state)
51+ Ok(Reshape { db, state })
70− pub fn abort(&mut self) -> anyhow::Result<()> {
54+ pub fn migrate<T>(&mut self, migrations: T) -> anyhow::Result<()>
71− self.db.lock(|db| {
55+ where
72− let mut state = State::load(db)?;
56+ T: IntoIterator<Item = Migration>,
73− abort(db, &mut state)
57+ {
77− pub fn remove(&mut self) -> anyhow::Result<()> {
79− let mut state = State::load(db)?;
58+ self.state = State::load(&mut self.db);
81− // Remove migration schemas and views
60+ // Make sure no migration is in progress
82− if let Some(current_migration) = &state::current_migration(db)? {
61+ if let state::Status::InProgress { .. } = &self.state.status {
83− db.run(&format!(
62+ println!("Migration already in progress, please complete using 'reshape complete'");
84− "DROP SCHEMA IF EXISTS {} CASCADE",
63+ return Ok(());
85− schema_name_for_migration(current_migration)
89− if let State::InProgress { migrations } = &state {
66+ if let state::Status::Completing { .. } = &self.state.status {
90− let target_migration = migrations.last().unwrap().name.to_string();
67+ println!(
91− db.run(&format!(
68+ "Migration already in progress and has started completion, please finish using 'reshape complete'"
92− "DROP SCHEMA IF EXISTS {} CASCADE",
69+ );
93− schema_name_for_migration(&target_migration)
70+ return Ok(());
97− // Remove all tables
73+ // Determine which migrations need to be applied by comparing the provided migrations
98− let schema = Schema::new();
74+ // with the already applied ones stored in the state. This will throw an error if the
99− for table in schema.get_tables(db)? {
75+ // two sets of migrations don't agree, for example if a new migration has been added
100− db.run(&format!(
76+ // in between two existing ones.
101− r#"
77+ let current_migration = &self.state.current_migration.clone();
102− DROP TABLE IF EXISTS "{}" CASCADE
78+ let remaining_migrations = self.state.get_remaining_migrations(migrations)?;
103− "#,
79+ if remaining_migrations.is_empty() {
104− table.real_name
80+ println!("No migrations left to apply");
105− ))?;
81+ return Ok(());
108− // Remove all enums
84+ // If we have already started applying some migrations we need to ensure that
109− let enums: Vec<String> = db
85+ // they are the same ones we want to apply now
110− .query("SELECT typname FROM pg_type WHERE typcategory = 'E'")?
86+ if let state::Status::Applying {
111− .iter()
87+ migrations: existing_migrations,
112− .map(|row| row.get("typname"))
88+ } = &self.state.status
114− for enum_type in enums {
90+ if existing_migrations != &remaining_migrations {
115− db.run(&format!("DROP TYPE {}", enum_type))?;
91+ return Err(anyhow!(
92+ "a previous migration seems to have failed without cleaning up. Please run `reshape abort` and then run migrate again."
118− // Reset state
97+ // Move to the "Applying" state which is necessary as we can't run the migrations
119− state.clear(db)?;
98+ // and state update as a single transaction. If a migration unexpectedly fails without
99+ // automatically aborting, this state saves us from dangling migrations. It forces the user
100+ // to either run migrate again (which works as all migrations are idempotent) or abort.
101+ self.state.applying(remaining_migrations.clone());
102+ self.state.save(&mut self.db)?;
121− println!("Reshape and all data has been removed");
104+ println!("Applying {} migrations\n", remaining_migrations.len());
123− Ok(())
106+ helpers::set_up_helpers(&mut self.db, current_migration)
124− })
107+ .context("failed to set up helpers")?;
128−pub fn latest_schema_from_migrations(migrations: &[Migration]) -> Option<String> {
109+ let mut new_schema = Schema::new();
129− migrations
110+ let mut last_migration_index = usize::MAX;
130− .last()
111+ let mut last_action_index = usize::MAX;
131− .map(|migration| schema_name_for_migration(&migration.name))
112+ let mut result: anyhow::Result<()> = Ok(());
134−pub fn schema_query_for_migration(migration_name: &str) -> String {
114+ for (migration_index, migration) in remaining_migrations.iter().enumerate() {
135− let schema_name = schema_name_for_migration(migration_name);
115+ println!("Migrating '{}':", migration.name);
136− format!("SET search_path TO {}", schema_name)
116+ last_migration_index = migration_index;
139−fn schema_name_for_migration(migration_name: &str) -> String {
118+ for (action_index, action) in migration.actions.iter().enumerate() {
140− format!("migration_{}", migration_name)
119+ last_action_index = action_index;
143−fn migrate(
121+ let description = action.describe();
144− db: &mut DbConn,
122+ print!(" + {} ", description);
146− migrations: impl IntoIterator<Item = Migration>,
147−) -> anyhow::Result<()> {
148− // Make sure no migration is in progress
149− if let State::InProgress { .. } = &state {
151− "Migration already in progress, please complete using 'reshape migration complete'"
156− if let State::Completing { .. } = &state {
124+ let ctx = MigrationContext::new(migration_index, action_index);
157− println!(
125+ result = action
158− "Migration already in progress and has started completion, please finish using 'reshape migration complete'"
126+ .run(&ctx, &mut self.db, &new_schema)
159− );
127+ .with_context(|| format!("failed to {}", description));
163− // Determine which migrations need to be applied by comparing the provided migrations
129+ if result.is_ok() {
164− // with the already applied ones stored in the state. This will throw an error if the
130+ action.update_schema(&ctx, &mut new_schema);
165− // two sets of migrations don't agree, for example if a new migration has been added
131+ println!("{}", "done".green());
166− // in between two existing ones.
132+ } else {
167− let remaining_migrations = state::remaining_migrations(db, migrations)?;
133+ println!("{}", "failed".red());
168− if remaining_migrations.is_empty() {
134+ break;
169− println!("No migrations left to apply");
135+ }
173− // If we have already started applying some migrations we need to ensure that
138+ println!();
174− // they are the same ones we want to apply now
175− if let State::Applying {
176− migrations: existing_migrations,
179− if existing_migrations != &remaining_migrations {
181− "a previous migration seems to have failed without cleaning up. Please run `reshape migration abort` and then run migrate again."
186− // Move to the "Applying" state which is necessary as we can't run the migrations
141+ // If a migration failed, we abort all the migrations that were applied
187− // and state update as a single transaction. If a migration unexpectedly fails without
142+ if let Err(err) = result {
188− // automatically aborting, this state saves us from dangling migrations. It forces the user
143+ println!("A migration failed, aborting migrations that have already been applied");
189− // to either run migrate again (which works as all migrations are idempotent) or abort.
190− state.applying(remaining_migrations.clone());
193− println!("Applying {} migrations\n", remaining_migrations.len());
195− let target_migration = remaining_migrations.last().unwrap().name.to_string();
196− helpers::set_up_helpers(db, &target_migration).context("failed to set up helpers")?;
198− let mut new_schema = Schema::new();
199− let mut last_migration_index = usize::MAX;
200− let mut last_action_index = usize::MAX;
201− let mut result: anyhow::Result<()> = Ok(());
203− 'outer: for (migration_index, migration) in remaining_migrations.iter().enumerate() {
204− println!("Migrating '{}':", migration.name);
205− last_migration_index = migration_index;
207− for (action_index, action) in migration.actions.iter().enumerate() {
208− last_action_index = action_index;
210− let description = action.describe();
211− print!(" + {} ", description);
214− MigrationContext::new(migration_index, action_index, state::current_migration(db)?);
216− .run(&ctx, db, &new_schema)
217− .with_context(|| format!("failed to {}", description));
220− action.update_schema(&ctx, &mut new_schema);
221− println!("{}", "done".green());
223− println!("{}", "failed".red());
228− println!();
145+ // Set to the Aborting state. This is to ensure that the failed
229− }
146+ // migration is fully aborted and nothing is left dangling.
147+ // If the abort is interrupted for any reason, the user can try again
148+ // by running `reshape abort`.
149+ self.state.aborting(
150+ remaining_migrations.clone(),
151+ last_migration_index + 1,
152+ last_action_index + 1,
231− // If a migration failed, we abort all the migrations that were applied
155+ // Abort will only
232− if let Err(err) = result {
156+ self.abort()?;
233− println!("A migration failed, aborting migrations that have already been applied");
235− // Set to the Aborting state. This is to ensure that the failed
158+ return Err(err);
236− // migration is fully aborted and nothing is left dangling.
159+ }
237− // If the abort is interrupted for any reason, the user can try again
238− // by running `reshape migration abort`.
240− remaining_migrations.clone(),
241− last_migration_index + 1,
242− last_action_index + 1,
245− // Abort will only
161+ // Create schema and views for migration
246− abort(db, state)?;
162+ let target_migration = remaining_migrations.last().unwrap().name.to_string();
163+ self.create_schema_for_migration(&target_migration, &new_schema)
165+ format!("failed to create schema for migration {}", target_migration)
168+ // Update state once migrations have been performed
169+ self.state.in_progress(remaining_migrations);
172+ .context("failed to save in-progress state")?;
174+ // If we started from a blank slate, we can finish the migration immediately
175+ if current_migration.is_none() {
176+ println!("Automatically completing migrations\n");
177+ self.complete_migration()
178+ .context("failed to automatically complete migrations")?;
180+ println!("Migrations complete:");
182+ " - Run '{}' from your application to use the latest schema",
183+ schema_query_for_migration(&target_migration)
186+ println!("Migrations have been applied and the new schema is ready for use:");
188+ " - Run '{}' from your application to use the latest schema",
189+ schema_query_for_migration(&target_migration)
192+ " - Run 'reshape complete' once your application has been updated and the previous schema is no longer in use"
248− return Err(err);
196+ Ok(())
251− // Create schema and views for migration
199+ pub fn complete_migration(&mut self) -> anyhow::Result<()> {
252− create_schema_for_migration(db, &target_migration, &new_schema)
253− .with_context(|| format!("failed to create schema for migration {}", target_migration))?;
255− // Update state once migrations have been performed
256− state.in_progress(remaining_migrations);
257− state.save(db).context("failed to save in-progress state")?;
259− println!("Migrations have been applied and the new schema is ready for use:");
261− " - Run '{}' from your application to use the latest schema",
262− schema_query_for_migration(&target_migration)
265− " - Run 'reshape migration complete' once your application has been updated and the previous schema is no longer in use"
270−fn complete(db: &mut DbConn, state: &mut State) -> anyhow::Result<()> {
271− // Make sure a migration is in progress
200+ // Make sure a migration is in progress
272− let (remaining_migrations, starting_migration_index, starting_action_index) = match state.clone() {
201+ let (remaining_migrations, starting_migration_index, starting_action_index) = match self.state.status.clone() {
273− State::InProgress { migrations } => {
202+ state::Status::InProgress { migrations } => {
274− // Move into the Completing state. Once in this state,
203+ // Move into the Completing state. Once in this state,
275− // the migration can't be aborted and must be completed.
204+ // the migration can't be aborted and must be completed.
276− state.completing(migrations.clone(), 0, 0);
205+ self.state.completing(migrations.clone(), 0, 0);
277− state.save(db).context("failed to save state")?;
206+ self.state.save(&mut self.db).context("failed to save state")?;
279− (migrations, 0, 0)
208+ (migrations, 0, 0)
281− State::Completing {
210+ state::Status::Completing {
282− migrations,
211+ migrations,
283− current_migration_index,
212+ current_migration_index,
284− current_action_index
213+ current_action_index
285− } => (migrations, current_migration_index, current_action_index),
214+ } => (migrations, current_migration_index, current_action_index),
286− State::Aborting { .. } => {
215+ state::Status::Aborting { .. } => {
287− return Err(anyhow!("migration been aborted and can't be completed. Please finish using `reshape migration abort`."))
216+ return Err(anyhow!("migration been aborted and can't be completed. Please finish using `reshape abort`."))
289− State::Applying { .. } => {
218+ state::Status::Applying { .. } => {
290− return Err(anyhow!("a previous migration unexpectedly failed. Please run `reshape migrate` to try applying the migration again."))
219+ return Err(anyhow!("a previous migration unexpectedly failed. Please run `reshape migrate` to try applying the migration again."))
292− State::Idle => {
221+ state::Status::Idle => {
293− println!("No migration in progress");
222+ println!("No migration in progress");
294− return Ok(());
223+ return Ok(());
298− // Remove previous migration's schema
299− if let Some(current_migration) = &state::current_migration(db)? {
301− "DROP SCHEMA IF EXISTS {} CASCADE",
302− schema_name_for_migration(current_migration)
304− .context("failed to remove previous migration's schema")?;
307− for (migration_index, migration) in remaining_migrations.iter().enumerate() {
227+ // Remove previous migration's schema
308− // Skip all the migrations which have already been completed
228+ if let Some(current_migration) = &self.state.current_migration {
309− if migration_index < starting_migration_index {
229+ self.db
310− continue;
230+ .run(&format!(
231+ "DROP SCHEMA IF EXISTS {} CASCADE",
232+ schema_name_for_migration(current_migration)
234+ .context("failed to remove previous migration's schema")?;
313− println!("Completing '{}':", migration.name);
237+ for (migration_index, migration) in remaining_migrations.iter().enumerate() {
315− for (action_index, action) in migration.actions.iter().enumerate() {
316− // Skip all actions which have already been completed
238+ // Skip all the migrations which have already been completed
317− if migration_index == starting_migration_index && action_index < starting_action_index {
239+ if migration_index < starting_migration_index {
318 continue;
240 continue;
321− let description = action.describe();
243+ println!("Completing '{}':", migration.name);
322− print!(" + {} ", description);
324− let ctx =
245+ for (action_index, action) in migration.actions.iter().enumerate() {
325− MigrationContext::new(migration_index, action_index, state::current_migration(db)?);
246+ // Skip all actions which have already been completed
247+ if migration_index == starting_migration_index
248+ && action_index < starting_action_index
327− // Update state to indicate that this action has been completed.
253+ let description = action.describe();
328− // We won't save this new state until after the action has completed.
254+ print!(" + {} ", description);
330− remaining_migrations.clone(),
331− migration_index + 1,
256+ let ctx = MigrationContext::new(migration_index, action_index);
258+ // Update state to indicate that this action has been completed.
259+ // We won't save this new state until after the action has completed.
260+ self.state.completing(
261+ remaining_migrations.clone(),
262+ migration_index + 1,
335− // This did_save check is necessary because of the borrow checker.
266+ // This did_save check is necessary because of the borrow checker.
336− // The Transaction which might be returned from action.complete
267+ // The Transaction which might be returned from action.complete
337− // contains a mutable reference to self.db. We need the Transaction
268+ // contains a mutable reference to self.db. We need the Transaction
338− // to be dropped before we can save the state using self.db instead,
269+ // to be dropped before we can save the state using self.db instead,
339− // which we achieve here by limiting the lifetime of the Transaction
270+ // which we achieve here by limiting the lifetime of the Transaction
340− // with a new block.
271+ // with a new block.
341− let did_save = {
272+ let did_save = {
342− let result = action
273+ let result = action
343− .complete(&ctx, db)
274+ .complete(&ctx, &mut self.db)
344− .with_context(|| format!("failed to complete migration {}", migration.name))
275+ .with_context(|| format!("failed to complete migration {}", migration.name))
345− .with_context(|| format!("failed to complete action: {}", description));
276+ .with_context(|| format!("failed to complete action: {}", description));
347− let maybe_transaction = match result {
278+ let maybe_transaction = match result {
348− Ok(maybe_transaction) => {
279+ Ok(maybe_transaction) => {
349− println!("{}", "done".green());
280+ println!("{}", "done".green());
350− maybe_transaction
281+ maybe_transaction
352− Err(e) => {
283+ Err(e) => {
353− println!("{}", "failed".red());
284+ println!("{}", "failed".red());
354− return Err(e);
285+ return Err(e);
289+ // Update state with which migrations and actions have been completed.
290+ // Each action can create and return a transaction if they need atomicity.
291+ // We use this transaction to update the state to ensure the action only completes.
293+ // We want to use a single transaction for each action to keep the length of
294+ // the transaction as short as possible. Wherever possible, we don't want to
295+ // use a transaction at all.
296+ if let Some(mut transaction) = maybe_transaction {
298+ .save(&mut transaction)
299+ .context("failed to save state after completing action")?;
302+ .context("failed to commit transaction")?;
358− // Update state with which migrations and actions have been completed.
310+ // If the action didn't return a transaction we save the state normally instead
359− // Each action can create and return a transaction if they need atomicity.
311+ if !did_save {
360− // We use this transaction to update the state to ensure the action only completes.
362− // We want to use a single transaction for each action to keep the length of
363− // the transaction as short as possible. Wherever possible, we don't want to
364− // use a transaction at all.
365− if let Some(mut transaction) = maybe_transaction {
366− state
312+ self.state
367− .save(&mut transaction)
313+ .save(&mut self.db)
368 .context("failed to save state after completing action")?;
314 .context("failed to save state after completing action")?;
371− .context("failed to commit transaction")?;
379− // If the action didn't return a transaction we save the state normally instead
383− .context("failed to save state after completing action")?;
387− println!();
321+ // Remove helpers which are no longer in use
322+ helpers::tear_down_helpers(&mut self.db).context("failed to tear down helpers")?;
326+ .context("failed to update state as completed")?;
329+ .context("failed to save state after setting as completed")?;
390− // Remove helpers which are no longer in use
334+ fn create_schema_for_migration(
391− helpers::tear_down_helpers(db).context("failed to tear down helpers")?;
335+ &mut self,
336+ migration_name: &str,
338+ ) -> anyhow::Result<()> {
339+ // Create schema for migration
340+ let schema_name = schema_name_for_migration(migration_name);
342+ .run(&format!("CREATE SCHEMA IF NOT EXISTS {}", schema_name))
345+ "failed to create schema {} for migration {}",
346+ schema_name, migration_name
350+ // Create views inside schema
351+ for table in schema.get_tables(&mut self.db)? {
352+ Self::create_view_for_table(&mut self.db, &table, &schema_name)?;
393− state
358+ fn create_view_for_table(
394− .complete(db)
359+ db: &mut impl Conn,
395− .context("failed to update state as completed")?;
360+ table: &Table,
362+ ) -> anyhow::Result<()> {
363+ let select_columns: Vec<String> = table
369+ "{real_name}" AS "{alias}"
371+ real_name = column.real_name,
372+ alias = column.name,
379+ CREATE OR REPLACE VIEW {schema}."{view_name}" AS
384+ table_name = table.real_name,
385+ view_name = table.name,
386+ columns = select_columns.join(","),
398−}
388+ .with_context(|| format!("failed to create view for table {}", table.name))?;
400−fn abort(db: &mut DbConn, state: &mut State) -> anyhow::Result<()> {
390+ Ok(())
401− let (remaining_migrations, last_migration_index, last_action_index) = match state.clone() {
391+ }
402− State::InProgress { migrations } | State::Applying { migrations } => {
403− // Set to the Aborting state. Once this is done, the migration has to
404− // be fully aborted and can't be completed.
405− state.aborting(migrations.clone(), 0, 0);
408− (migrations, usize::MAX, usize::MAX)
393+ pub fn remove(&mut self) -> anyhow::Result<()> {
409− }
394+ // Remove migration schemas and views
410− State::Aborting {
395+ if let Some(current_migration) = &self.state.current_migration {
411− migrations,
396+ self.db.run(&format!(
412− last_migration_index,
397+ "DROP SCHEMA IF EXISTS {} CASCADE",
413− last_action_index,
398+ schema_name_for_migration(current_migration)
414− } => (migrations, last_migration_index, last_action_index),
399+ ))?;
415− State::Completing { .. } => {
416− return Err(anyhow!("migration completion has already been started. Please run `reshape migration complete` again to finish it."));
418− State::Idle => {
401+
419− println!("No migration is in progress");
402+ if let Status::InProgress { migrations } = &self.state.status {
420− return Ok(());
403+ let target_migration = migrations.last().unwrap().name.to_string();
404+ self.db.run(&format!(
405+ "DROP SCHEMA IF EXISTS {} CASCADE",
406+ schema_name_for_migration(&target_migration)
423−
410+ // Remove all tables
424− // Remove new migration's schema
411+ let schema = Schema::new();
425− let target_migration = remaining_migrations.last().unwrap().name.to_string();
412+ for table in schema.get_tables(&mut self.db)? {
426− let schema_name = schema_name_for_migration(&target_migration);
413+ self.db.run(&format!(
427− db.run(&format!("DROP SCHEMA IF EXISTS {} CASCADE", schema_name,))
415+ DROP TABLE IF EXISTS "{}" CASCADE
428− .with_context(|| format!("failed to drop schema {}", schema_name))?;
416+ "#,
430− // Abort all pending migrations
418+ ))?;
431− // Abort all migrations in reverse order
432− for (migration_index, migration) in remaining_migrations.iter().enumerate().rev() {
433− // Skip migrations which shouldn't be aborted
434− // The reason can be that they have already been aborted or that
435− // the migration was never applied in the first place.
436− if migration_index >= last_migration_index {
440− print!("Aborting '{}' ", migration.name);
421+ // Reset state
422+ self.state.clear(&mut self.db)?;
442− for (action_index, action) in migration.actions.iter().enumerate().rev() {
424+ println!("Reshape and all data has been removed");
429+ pub fn abort(&mut self) -> anyhow::Result<()> {
430+ let (remaining_migrations, last_migration_index, last_action_index) = match self
435+ Status::InProgress { migrations } | Status::Applying { migrations } => {
436+ // Set to the Aborting state. Once this is done, the migration has to
437+ // be fully aborted and can't be completed.
438+ self.state.aborting(migrations.clone(), 0, 0);
439+ self.state.save(&mut self.db)?;
441+ (migrations, usize::MAX, usize::MAX)
445+ last_migration_index,
447+ } => (migrations, last_migration_index, last_action_index),
448+ Status::Completing { .. } => {
449+ return Err(anyhow!("Migration completion has already been started. Please run `reshape complete` again to finish it."));
452+ println!("No migration is in progress");
457+ // Remove new migration's schema
458+ let target_migration = remaining_migrations.last().unwrap().name.to_string();
459+ let schema_name = schema_name_for_migration(&target_migration);
461+ .run(&format!("DROP SCHEMA IF EXISTS {} CASCADE", schema_name,))
462+ .with_context(|| format!("failed to drop schema {}", schema_name))?;
464+ // Abort all pending migrations
465+ self.abort_migrations(
466+ &remaining_migrations,
467+ last_migration_index,
471+ helpers::tear_down_helpers(&mut self.db).context("failed to tear down helpers")?;
473+ self.state.status = state::Status::Idle;
476+ .context("failed to save state")?;
481+ fn abort_migrations(
483+ migrations: &[Migration],
484+ upper_migration_index: usize,
485+ upper_action_index: usize,
486+ ) -> anyhow::Result<()> {
487+ // Abort all migrations in reverse order
488+ for (migration_index, migration) in migrations.iter().enumerate().rev() {
443− // Skip actions which shouldn't be aborted
489+ // Skip migrations which shouldn't be aborted
444 // The reason can be that they have already been aborted or that
490 // The reason can be that they have already been aborted or that
445− // the action was never applied in the first place.
491+ // the migration was never applied in the first place.
446− if migration_index == last_migration_index - 1 && action_index >= last_action_index {
492+ if migration_index >= upper_migration_index {
447 continue;
493 continue;
450− let ctx =
496+ print!("Aborting '{}' ", migration.name);
451− MigrationContext::new(migration_index, action_index, state::current_migration(db)?);
454− .with_context(|| format!("failed to abort migration {}", migration.name))
455− .with_context(|| format!("failed to abort action: {}", action.describe()))?;
457− // Update state with which migrations and actions have been aborted.
458− // We don't need to run this in a transaction as aborts are idempotent.
459− state.aborting(remaining_migrations.to_vec(), migration_index, action_index);
460− state.save(db).context("failed to save state")?;
463− println!("{}", "done".green());
498+ for (action_index, action) in migration.actions.iter().enumerate().rev() {
499+ // Skip actions which shouldn't be aborted
500+ // The reason can be that they have already been aborted or that
501+ // the action was never applied in the first place.
502+ if migration_index == upper_migration_index - 1
503+ && action_index >= upper_action_index
466− helpers::tear_down_helpers(db).context("failed to tear down helpers")?;
508+ let ctx = MigrationContext::new(migration_index, action_index);
510+ .abort(&ctx, &mut self.db)
511+ .with_context(|| format!("failed to abort migration {}", migration.name))
512+ .with_context(|| format!("failed to abort action: {}", action.describe()))?;
514+ // Update state with which migrations and actions have been aborted.
515+ // We don't need to run this in a transaction as aborts are idempotent.
517+ .aborting(migrations.to_vec(), migration_index, action_index);
520+ .context("failed to save state")?;
468− *state = State::Idle;
523+ println!("{}", "done".green());
469− state.save(db).context("failed to save state")?;
524+ }
471− Ok(())
529+pub fn latest_schema_from_migrations(migrations: &[Migration]) -> Option<String> {
532+ .map(|migration| schema_name_for_migration(&migration.name))
474−fn create_schema_for_migration(
476− migration_name: &str,
535+pub fn schema_query_for_migration(migration_name: &str) -> String {
478−) -> anyhow::Result<()> {
479− // Create schema for migration
480 let schema_name = schema_name_for_migration(migration_name);
536 let schema_name = schema_name_for_migration(migration_name);
481− db.run(&format!("CREATE SCHEMA IF NOT EXISTS {}", schema_name))
537+ format!("SET search_path TO {}", schema_name)
484− "failed to create schema {} for migration {}",
485− schema_name, migration_name
489− // Create views inside schema
490− for table in schema.get_tables(db)? {
491− create_view_for_table(db, &table, &schema_name)?;
497−fn create_view_for_table(db: &mut impl Conn, table: &Table, schema: &str) -> anyhow::Result<()> {
540+fn schema_name_for_migration(migration_name: &str) -> String {
498− let select_columns: Vec<String> = table
541+ format!("migration_{}", migration_name)
504− "{real_name}" AS "{alias}"
506− real_name = column.real_name,
507− alias = column.name,
514− CREATE OR REPLACE VIEW {schema}."{view_name}" AS
519− table_name = table.real_name,
520− view_name = table.name,
521− columns = select_columns.join(","),
523− .with_context(|| format!("failed to create view for table {}", table.name))?;