Track download size in ps_buckets

crates/core/src/migrations.rs

@@ -13,7 +13,7 @@ use crate::fix_data::apply_v035_fix;
 use crate::schema::inspection::ExistingView;
 use crate::sync::BucketPriority;
 
-pub const LATEST_VERSION: i32 = 11;
+pub const LATEST_VERSION: i32 = 12;
 
 pub fn powersync_migrate(
     ctx: *mut sqlite::context,
@@ -413,5 +413,16 @@ json_object('sql', 'DELETE FROM ps_migration WHERE id >= 11')
         local_db.exec_safe(stmt).into_db_result(local_db)?;
     }
 
+    if current_version < 12 && target_version >= 12 {
+        let stmt = "\
+ALTER TABLE ps_buckets ADD COLUMN downloaded_size INTEGER NOT NULL DEFAULT 0;
+INSERT INTO ps_migration(id, down_migrations) VALUES(12, json_array(
+json_object('sql', 'ALTER TABLE ps_buckets DROP COLUMN downloaded_size'),
+json_object('sql', 'DELETE FROM ps_migration WHERE id >= 12')
+));
+";
+        local_db.exec_safe(stmt).into_db_result(local_db)?;
+    }
+
     Ok(())
 }

crates/core/src/operations.rs

@@ -22,7 +22,7 @@ pub fn insert_operation(db: *mut sqlite::sqlite3, data: &str) -> Result<(), Powe
     let adapter = StorageAdapter::new(db)?;
 
     for line in &batch.buckets {
-        insert_bucket_operations(&adapter, &line)?;
+        insert_bucket_operations(&adapter, &line, 0)?;
     }
 
     Ok(())

crates/core/src/sync/line.rs

@@ -6,6 +6,9 @@ use serde::Deserialize;
 use serde::de::{Error, IgnoredAny, VariantAccess, Visitor};
 use serde_with::{DisplayFromStr, serde_as};
 
+use crate::bson;
+use crate::error::PowerSyncError;
+
 use super::Checksum;
 use super::bucket_priority::BucketPriority;
 
@@ -15,6 +18,49 @@ use super::bucket_priority::BucketPriority;
 /// internal copy).
 type SyncLineStr<'a> = Cow<'a, str>;
 
+#[derive(Clone, Copy)]
+pub enum SyncLineSource<'a> {
+    /// Sync lines that have been decoded from JSON.
+    Text(&'a str),
+
+    /// Sync lines that have been decoded from BSON.
+    Binary(&'a [u8]),
+}
+
+impl<'a> SyncLineSource<'a> {
+    pub fn len(&self) -> usize {
+        match self {
+            SyncLineSource::Text(text) => text.len(),
+            SyncLineSource::Binary(binary) => binary.len(),
+        }
+    }
+}
+
+pub struct SyncLineWithSource<'a> {
+    pub source: SyncLineSource<'a>,
+    pub line: SyncLine<'a>,
+}
+
+impl<'a> SyncLineWithSource<'a> {
+    pub fn from_text(source: &'a str) -> Result<Self, PowerSyncError> {
+        let line = serde_json::from_str(source)
+            .map_err(|e| PowerSyncError::sync_protocol_error("invalid text line", e))?;
+        Ok(SyncLineWithSource {
+            source: SyncLineSource::Text(source),
+            line,
+        })
+    }
+
+    pub fn from_binary(source: &'a [u8]) -> Result<Self, PowerSyncError> {
+        let line = bson::from_bytes(source)
+            .map_err(|e| PowerSyncError::sync_protocol_error("invalid binary line", e))?;
+        Ok(SyncLineWithSource {
+            source: SyncLineSource::Binary(source),
+            line,
+        })
+    }
+}
+
 #[derive(Debug)]
 
 pub enum SyncLine<'a> {

crates/core/src/sync/operations.rs

@@ -16,9 +16,11 @@ use super::{
     storage_adapter::{BucketInfo, StorageAdapter},
 };
 
+/// If known, `size` should be the size of the buffer from which data has been decoded in bytes.
 pub fn insert_bucket_operations(
     adapter: &StorageAdapter,
     data: &DataLine,
+    size: usize,
 ) -> Result<(), PowerSyncError> {
     let db = adapter.db;
     let BucketInfo {
@@ -194,14 +196,16 @@ WHERE bucket = ?1",
                 SET last_op = ?2,
                     add_checksum = (add_checksum + ?3) & 0xffffffff,
                     op_checksum = (op_checksum + ?4) & 0xffffffff,
-                    count_since_last = count_since_last + ?5
+                    count_since_last = count_since_last + ?5,
+                    downloaded_size = downloaded_size + ?6
             WHERE id = ?1",
         )?;
         statement.bind_int64(1, bucket_id)?;
         statement.bind_int64(2, *last_op)?;
         statement.bind_int(3, add_checksum.bitcast_i32())?;
         statement.bind_int(4, op_checksum.bitcast_i32())?;
         statement.bind_int(5, added_ops)?;
+        statement.bind_int64(6, size as i64)?;
 
         statement.exec()?;
     }

crates/core/src/sync/streaming_sync.rs

@@ -18,7 +18,6 @@ use alloc::{
 use futures_lite::FutureExt;
 
 use crate::{
-    bson,
     error::{PowerSyncError, PowerSyncErrorCause},
     kv::client_id,
     state::DatabaseState,
@@ -28,7 +27,7 @@ use crate::{
         interface::{CloseSyncStream, StartSyncStream, StreamSubscriptionRequest},
         line::{
             BucketSubscriptionReason, DataLine, StreamDescription, StreamSubscriptionError,
-            StreamSubscriptionErrorCause,
+            StreamSubscriptionErrorCause, SyncLineWithSource,
         },
         subscriptions::LocallyTrackedSubscription,
         sync_status::{ActiveStreamSubscription, Timestamp},
@@ -268,8 +267,10 @@ impl StreamingSyncIteration {
         &self,
         target: &SyncTarget,
         event: &mut ActiveEvent,
-        line: &'a SyncLine<'a>,
+        line: &'a SyncLineWithSource<'a>,
     ) -> Result<SyncStateMachineTransition<'a>, PowerSyncError> {
+        let SyncLineWithSource { source, line } = line;
+
         Ok(match line {
             SyncLine::Checkpoint(checkpoint) => {
                 let (to_delete, updated_target) = target.track_checkpoint(&checkpoint);
@@ -386,7 +387,7 @@ impl StreamingSyncIteration {
                 }
             }
             SyncLine::Data(data_line) => {
-                insert_bucket_operations(&self.adapter, &data_line)?;
+                insert_bucket_operations(&self.adapter, &data_line, source.len())?;
                 SyncStateMachineTransition::DataLineSaved { line: data_line }
             }
             SyncLine::KeepAlive(token) => {
@@ -492,7 +493,7 @@ impl StreamingSyncIteration {
         &mut self,
         target: &mut SyncTarget,
         event: &mut ActiveEvent,
-        line: &SyncLine,
+        line: &SyncLineWithSource,
     ) -> Result<Option<CloseSyncStream>, PowerSyncError> {
         let transition = self.prepare_handling_sync_line(target, event, line)?;
         Ok(self.apply_transition(target, event, transition))
@@ -506,7 +507,7 @@ impl StreamingSyncIteration {
         let hide_disconnect = loop {
             let event = Self::receive_event().await;
 
-            let line: SyncLine = match event.event {
+            let line: SyncLineWithSource = match event.event {
                 SyncEvent::Initialize { .. } => {
                     panic!("Initialize should only be emited once")
                 }
@@ -515,10 +516,8 @@ impl StreamingSyncIteration {
                         .update(|s| s.disconnect(), &mut event.instructions);
                     break false;
                 }
-                SyncEvent::TextLine { data } => serde_json::from_str(data)
-                    .map_err(|e| PowerSyncError::sync_protocol_error("invalid text line", e))?,
-                SyncEvent::BinaryLine { data } => bson::from_bytes(data)
-                    .map_err(|e| PowerSyncError::sync_protocol_error("invalid binary line", e))?,
+                SyncEvent::TextLine { data } => SyncLineWithSource::from_text(data)?,
+                SyncEvent::BinaryLine { data } => SyncLineWithSource::from_binary(data)?,
                 SyncEvent::UploadFinished => {
                     self.try_applying_write_after_completed_upload(event)?;
 

dart/test/sync_test.dart

@@ -1391,6 +1391,22 @@ CREATE TRIGGER users_ref_delete
     db.dispose();
     expect(vfs.openFiles, isZero);
   });
+
+  test('tracks download size', () {
+    invokeControl('start', null);
+    pushCheckpoint(buckets: [bucketDescription('a', count: 2)]);
+
+    void expectDownloadSize(int size) {
+      final [row] = db.select('SELECT downloaded_size FROM ps_buckets');
+      expect(row[0], size);
+    }
+
+    pushSyncData('a', '1', 'row-0', 'PUT', {'col': 'hi'});
+    expectDownloadSize(isBson ? 185 : 186);
+
+    pushSyncData('a', '1', 'row-1', 'PUT', {'col': 'hi again'});
+    expectDownloadSize(isBson ? 376 : 378);
+  });
 }
 
 final priorityBuckets = [

dart/test/utils/fix_035_fixtures.dart

@@ -18,9 +18,9 @@ const dataBroken = '''
 
 /// Data after applying the migration fix, but before sync_local
 const dataMigrated = '''
-;INSERT INTO ps_buckets(id, name, last_applied_op, last_op, target_op, add_checksum, op_checksum, pending_delete, count_at_last, count_since_last) VALUES
-  (1, 'b1', 0, 0, 0, 0, 120, 0, 0, 0),
-  (2, 'b2', 0, 0, 0, 0, 3, 0, 0, 0)
+;INSERT INTO ps_buckets(id, name, last_applied_op, last_op, target_op, add_checksum, op_checksum, pending_delete, count_at_last, count_since_last, downloaded_size) VALUES
+  (1, 'b1', 0, 0, 0, 0, 120, 0, 0, 0, 0),
+  (2, 'b2', 0, 0, 0, 0, 3, 0, 0, 0, 0)
 ;INSERT INTO ps_oplog(bucket, op_id, row_type, row_id, key, data, hash) VALUES
   (1, 1, 'todos', 't1', '', '{}', 100),
   (1, 2, 'todos', 't2', '', '{}', 20),
@@ -39,9 +39,9 @@ const dataMigrated = '''
 
 /// Data after applying the migration fix and sync_local
 const dataFixed = '''
-;INSERT INTO ps_buckets(id, name, last_applied_op, last_op, target_op, add_checksum, op_checksum, pending_delete, count_at_last, count_since_last) VALUES
-  (1, 'b1', 0, 0, 0, 0, 120, 0, 0, 0),
-  (2, 'b2', 0, 0, 0, 0, 3, 0, 0, 0)
+;INSERT INTO ps_buckets(id, name, last_applied_op, last_op, target_op, add_checksum, op_checksum, pending_delete, count_at_last, count_since_last, downloaded_size) VALUES
+  (1, 'b1', 0, 0, 0, 0, 120, 0, 0, 0, 0),
+  (2, 'b2', 0, 0, 0, 0, 3, 0, 0, 0, 0)
 ;INSERT INTO ps_oplog(bucket, op_id, row_type, row_id, key, data, hash) VALUES
   (1, 1, 'todos', 't1', '', '{}', 100),
   (1, 2, 'todos', 't2', '', '{}', 20),

dart/test/utils/migration_fixtures.dart

@@ -1,5 +1,5 @@
 /// The current database version
-const databaseVersion = 11;
+const databaseVersion = 12;
 
 /// This is the base database state that we expect at various schema versions.
 /// Generated by loading the specific library version, and exporting the schema.
@@ -414,6 +414,67 @@ const expectedState = <int, String>{
 ;INSERT INTO ps_migration(id, down_migrations) VALUES(9, '[{"sql":"ALTER TABLE ps_buckets DROP COLUMN count_at_last"},{"sql":"ALTER TABLE ps_buckets DROP COLUMN count_since_last"},{"sql":"DELETE FROM ps_migration WHERE id >= 9"}]')
 ;INSERT INTO ps_migration(id, down_migrations) VALUES(10, '[{"sql":"SELECT powersync_drop_view(view.name)\n  FROM sqlite_master view\n  WHERE view.type = ''view''\n    AND view.sql GLOB  ''*-- powersync-auto-generated''"},{"sql":"DELETE FROM ps_migration WHERE id >= 10"}]')
 ;INSERT INTO ps_migration(id, down_migrations) VALUES(11, '[{"sql":"DROP TABLE ps_stream_subscriptions"},{"sql":"DELETE FROM ps_migration WHERE id >= 11"}]')
+''',
+  12: r'''
+;CREATE TABLE ps_buckets(
+  id INTEGER PRIMARY KEY,
+  name TEXT NOT NULL,
+  last_applied_op INTEGER NOT NULL DEFAULT 0,
+  last_op INTEGER NOT NULL DEFAULT 0,
+  target_op INTEGER NOT NULL DEFAULT 0,
+  add_checksum INTEGER NOT NULL DEFAULT 0,
+  op_checksum INTEGER NOT NULL DEFAULT 0,
+  pending_delete INTEGER NOT NULL DEFAULT 0
+, count_at_last INTEGER NOT NULL DEFAULT 0, count_since_last INTEGER NOT NULL DEFAULT 0, downloaded_size INTEGER NOT NULL DEFAULT 0) STRICT
+;CREATE TABLE ps_crud (id INTEGER PRIMARY KEY AUTOINCREMENT, data TEXT, tx_id INTEGER)
+;CREATE TABLE ps_kv(key TEXT PRIMARY KEY NOT NULL, value BLOB)
+;CREATE TABLE ps_migration(id INTEGER PRIMARY KEY, down_migrations TEXT)
+;CREATE TABLE ps_oplog(
+  bucket INTEGER NOT NULL,
+  op_id INTEGER NOT NULL,
+  row_type TEXT,
+  row_id TEXT,
+  key TEXT,
+  data TEXT,
+  hash INTEGER NOT NULL) STRICT
+;CREATE TABLE ps_stream_subscriptions (
+  id INTEGER NOT NULL PRIMARY KEY,
+  stream_name TEXT NOT NULL,
+  active INTEGER NOT NULL DEFAULT FALSE,
+  is_default INTEGER NOT NULL DEFAULT FALSE,
+  local_priority INTEGER,
+  local_params TEXT NOT NULL DEFAULT 'null',
+  ttl INTEGER,
+  expires_at INTEGER,
+  last_synced_at INTEGER,
+  UNIQUE (stream_name, local_params)
+) STRICT
+;CREATE TABLE ps_sync_state (
+  priority INTEGER NOT NULL PRIMARY KEY,
+  last_synced_at TEXT NOT NULL
+) STRICT
+;CREATE TABLE ps_tx(id INTEGER PRIMARY KEY NOT NULL, current_tx INTEGER, next_tx INTEGER)
+;CREATE TABLE ps_untyped(type TEXT NOT NULL, id TEXT NOT NULL, data TEXT, PRIMARY KEY (type, id))
+;CREATE TABLE ps_updated_rows(
+  row_type TEXT,
+  row_id TEXT,
+  PRIMARY KEY(row_type, row_id)) STRICT, WITHOUT ROWID
+;CREATE UNIQUE INDEX ps_buckets_name ON ps_buckets (name)
+;CREATE INDEX ps_oplog_key ON ps_oplog (bucket, key)
+;CREATE INDEX ps_oplog_opid ON ps_oplog (bucket, op_id)
+;CREATE INDEX ps_oplog_row ON ps_oplog (row_type, row_id)
+;INSERT INTO ps_migration(id, down_migrations) VALUES(1, null)
+;INSERT INTO ps_migration(id, down_migrations) VALUES(2, '[{"sql":"DELETE FROM ps_migration WHERE id >= 2","params":[]},{"sql":"DROP TABLE ps_tx","params":[]},{"sql":"ALTER TABLE ps_crud DROP COLUMN tx_id","params":[]}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(3, '[{"sql":"DELETE FROM ps_migration WHERE id >= 3"},{"sql":"DROP TABLE ps_kv"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(4, '[{"sql":"DELETE FROM ps_migration WHERE id >= 4"},{"sql":"ALTER TABLE ps_buckets DROP COLUMN op_checksum"},{"sql":"ALTER TABLE ps_buckets DROP COLUMN remove_operations"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(5, '[{"sql":"SELECT powersync_drop_view(view.name)\n  FROM sqlite_master view\n  WHERE view.type = ''view''\n    AND view.sql GLOB  ''*-- powersync-auto-generated''"},{"sql":"ALTER TABLE ps_buckets RENAME TO ps_buckets_5"},{"sql":"ALTER TABLE ps_oplog RENAME TO ps_oplog_5"},{"sql":"CREATE TABLE ps_buckets(\n  name TEXT PRIMARY KEY,\n  last_applied_op INTEGER NOT NULL DEFAULT 0,\n  last_op INTEGER NOT NULL DEFAULT 0,\n  target_op INTEGER NOT NULL DEFAULT 0,\n  add_checksum INTEGER NOT NULL DEFAULT 0,\n  pending_delete INTEGER NOT NULL DEFAULT 0\n, op_checksum INTEGER NOT NULL DEFAULT 0, remove_operations INTEGER NOT NULL DEFAULT 0)"},{"sql":"INSERT INTO ps_buckets(name, last_applied_op, last_op, target_op, add_checksum, op_checksum, pending_delete)\n    SELECT name, last_applied_op, last_op, target_op, add_checksum, op_checksum, pending_delete FROM ps_buckets_5"},{"sql":"CREATE TABLE ps_oplog(\n  bucket TEXT NOT NULL,\n  op_id INTEGER NOT NULL,\n  op INTEGER NOT NULL,\n  row_type TEXT,\n  row_id TEXT,\n  key TEXT,\n  data TEXT,\n  hash INTEGER NOT NULL,\n  superseded INTEGER NOT NULL)"},{"sql":"CREATE INDEX ps_oplog_by_row ON ps_oplog (row_type, row_id) WHERE superseded = 0"},{"sql":"CREATE INDEX ps_oplog_by_opid ON ps_oplog (bucket, op_id)"},{"sql":"CREATE INDEX ps_oplog_by_key ON ps_oplog (bucket, key) WHERE superseded = 0"},{"sql":"INSERT INTO ps_oplog(bucket, op_id, op, row_type, row_id, key, data, hash, superseded)\n    SELECT ps_buckets_5.name, oplog.op_id, 3, oplog.row_type, oplog.row_id, oplog.key, oplog.data, oplog.hash, 0\n    FROM ps_oplog_5 oplog\n    JOIN ps_buckets_5\n        ON ps_buckets_5.id = oplog.bucket"},{"sql":"DROP TABLE ps_oplog_5"},{"sql":"DROP TABLE ps_buckets_5"},{"sql":"INSERT INTO ps_oplog(bucket, op_id, op, row_type, row_id, hash, superseded)\n    SELECT ''$local'', 1, 4, r.row_type, r.row_id, 0, 0\n    FROM ps_updated_rows r"},{"sql":"INSERT OR REPLACE INTO ps_buckets(name, pending_delete, last_op, target_op) VALUES(''$local'', 1, 0, 9223372036854775807)"},{"sql":"DROP TABLE ps_updated_rows"},{"sql":"DELETE FROM ps_migration WHERE id >= 5"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(6, '[{"sql":"DELETE FROM ps_migration WHERE id >= 6"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(7, '[{"sql":"INSERT OR REPLACE INTO ps_kv(key, value) SELECT ''last_synced_at'', last_synced_at FROM ps_sync_state WHERE priority = 2147483647"},{"sql":"DROP TABLE ps_sync_state"},{"sql":"DELETE FROM ps_migration WHERE id >= 7"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(8, '[{"sql":"ALTER TABLE ps_sync_state RENAME TO ps_sync_state_new"},{"sql":"CREATE TABLE ps_sync_state (\n  priority INTEGER NOT NULL,\n  last_synced_at TEXT NOT NULL\n) STRICT"},{"sql":"INSERT INTO ps_sync_state SELECT * FROM ps_sync_state_new"},{"sql":"DROP TABLE ps_sync_state_new"},{"sql":"DELETE FROM ps_migration WHERE id >= 8"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(9, '[{"sql":"ALTER TABLE ps_buckets DROP COLUMN count_at_last"},{"sql":"ALTER TABLE ps_buckets DROP COLUMN count_since_last"},{"sql":"DELETE FROM ps_migration WHERE id >= 9"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(10, '[{"sql":"SELECT powersync_drop_view(view.name)\n  FROM sqlite_master view\n  WHERE view.type = ''view''\n    AND view.sql GLOB  ''*-- powersync-auto-generated''"},{"sql":"DELETE FROM ps_migration WHERE id >= 10"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(11, '[{"sql":"DROP TABLE ps_stream_subscriptions"},{"sql":"DELETE FROM ps_migration WHERE id >= 11"}]')
+;INSERT INTO ps_migration(id, down_migrations) VALUES(12, '[{"sql":"ALTER TABLE ps_buckets DROP COLUMN downloaded_size"},{"sql":"DELETE FROM ps_migration WHERE id >= 12"}]')
 ''',
 };
 
@@ -527,6 +588,17 @@ const data1 = <int, String>{
   (2, 3, 'lists', 'l1', '', '{}', 3)
 ;INSERT INTO ps_updated_rows(row_type, row_id) VALUES
   ('lists', 'l2')
+''',
+  12: r'''
+;INSERT INTO ps_buckets(id, name, last_applied_op, last_op, target_op, add_checksum, op_checksum, pending_delete, count_at_last, count_since_last, downloaded_size) VALUES
+  (1, 'b1', 0, 0, 0, 0, 120, 0, 0, 0, 0),
+  (2, 'b2', 0, 0, 0, 1005, 3, 0, 0, 0, 0)
+;INSERT INTO ps_oplog(bucket, op_id, row_type, row_id, key, data, hash) VALUES
+  (1, 1, 'todos', 't1', '', '{}', 100),
+  (1, 2, 'todos', 't2', '', '{}', 20),
+  (2, 3, 'lists', 'l1', '', '{}', 3)
+;INSERT INTO ps_updated_rows(row_type, row_id) VALUES
+  ('lists', 'l2')
 '''
 };
 
@@ -573,6 +645,7 @@ final dataDown1 = <int, String>{
   8: data1[5]!,
   9: data1[9]!,
   10: data1[9]!,
+  11: data1[10]!,
 };
 
 final finalData1 = data1[databaseVersion]!;