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This commit is contained in:
Christien Rioux 2024-05-15 22:45:50 -04:00
parent 3315644ba8
commit 8cd73b2844
14 changed files with 513 additions and 114 deletions
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44
packages/veilid_support/example/integration_test/app_test.dart
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@ -7,6 +7,7 @@ import 'package:integration_test/integration_test.dart';
import 'package:veilid_test/veilid_test.dart';
import 'fixtures/fixtures.dart';
import 'test_dht_log.dart';
import 'test_dht_record_pool.dart';
import 'test_dht_short_array.dart';
@ -38,24 +39,37 @@ void main() {
test('create pool', testDHTRecordPoolCreate);
group('DHTRecordPool Tests', () {
// group('DHTRecordPool Tests', () {
// setUpAll(dhtRecordPoolFixture.setUp);
// tearDownAll(dhtRecordPoolFixture.tearDown);
// test('create/delete record', testDHTRecordCreateDelete);
// test('record scopes', testDHTRecordScopes);
// test('create/delete deep record', testDHTRecordDeepCreateDelete);
// });
// group('DHTShortArray Tests', () {
// setUpAll(dhtRecordPoolFixture.setUp);
// tearDownAll(dhtRecordPoolFixture.tearDown);
// for (final stride in [256, 16 /*64, 32, 16, 8, 4, 2, 1 */]) {
// test('create shortarray stride=$stride',
// makeTestDHTShortArrayCreateDelete(stride: stride));
// test('add shortarray stride=$stride',
// makeTestDHTShortArrayAdd(stride: 256));
// }
// });
group('DHTLog Tests', () {
setUpAll(dhtRecordPoolFixture.setUp);
tearDownAll(dhtRecordPoolFixture.tearDown);
test('create/delete record', testDHTRecordCreateDelete);
test('record scopes', testDHTRecordScopes);
test('create/delete deep record', testDHTRecordDeepCreateDelete);
});
group('DHTShortArray Tests', () {
setUpAll(dhtRecordPoolFixture.setUp);
tearDownAll(dhtRecordPoolFixture.tearDown);
for (final stride in [256, 64, 32, 16, 8, 4, 2, 1]) {
test('create shortarray stride=$stride',
makeTestDHTShortArrayCreateDelete(stride: stride));
test('add shortarray stride=$stride',
makeTestDHTShortArrayAdd(stride: 256));
for (final stride in [256, 16 /*64, 32, 16, 8, 4, 2, 1 */]) {
test('create log stride=$stride',
makeTestDHTLogCreateDelete(stride: stride));
test('add/truncate log stride=$stride',
makeTestDHTLogAddTruncate(stride: 256),
timeout: const Timeout(Duration(seconds: 480)));
}
});
});

13
packages/veilid_support/example/integration_test/fixtures/dht_record_pool_fixture.dart
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@ -1,6 +1,7 @@
import 'dart:async';
import 'package:async_tools/async_tools.dart';
import 'package:flutter/foundation.dart';
import 'package:veilid_support/veilid_support.dart';
import 'package:veilid_test/veilid_test.dart';
@ -12,9 +13,13 @@ class DHTRecordPoolFixture implements TickerFixtureTickable {
UpdateProcessorFixture updateProcessorFixture;
TickerFixture tickerFixture;
Future<void> setUp() async {
Future<void> setUp({bool purge = true}) async {
await _fixtureMutex.acquire();
await DHTRecordPool.init();
if (purge) {
await Veilid.instance.debug('record purge local');
await Veilid.instance.debug('record purge remote');
}
await DHTRecordPool.init(logger: debugPrintSynchronously);
tickerFixture.register(this);
}
@ -22,6 +27,10 @@ class DHTRecordPoolFixture implements TickerFixtureTickable {
assert(_fixtureMutex.isLocked, 'should not tearDown without setUp');
tickerFixture.unregister(this);
await DHTRecordPool.close();
final recordList = await Veilid.instance.debug('record list local');
debugPrintSynchronously('DHT Record List:\n$recordList');
_fixtureMutex.release();
}

130
packages/veilid_support/example/integration_test/test_dht_log.dart Normal file
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@ -0,0 +1,130 @@
import 'dart:convert';
import 'package:flutter_test/flutter_test.dart';
import 'package:veilid_support/veilid_support.dart';
Future<void> Function() makeTestDHTLogCreateDelete({required int stride}) =>
() async {
// Close before delete
{
final dlog = await DHTLog.create(
debugName: 'log_create_delete 1 stride $stride', stride: stride);
expect(await dlog.operate((r) async => r.length), isZero);
expect(dlog.isOpen, isTrue);
await dlog.close();
expect(dlog.isOpen, isFalse);
await dlog.delete();
// Operate should fail
await expectLater(() async => dlog.operate((r) async => r.length),
throwsA(isA<StateError>()));
}
// Close after delete
{
final dlog = await DHTLog.create(
debugName: 'log_create_delete 2 stride $stride', stride: stride);
await dlog.delete();
// Operate should still succeed because things aren't closed
expect(await dlog.operate((r) async => r.length), isZero);
await dlog.close();
// Operate should fail
await expectLater(() async => dlog.operate((r) async => r.length),
throwsA(isA<StateError>()));
}
// Close after delete multiple
// Okay to request delete multiple times before close
{
final dlog = await DHTLog.create(
debugName: 'log_create_delete 3 stride $stride', stride: stride);
await dlog.delete();
await dlog.delete();
// Operate should still succeed because things aren't closed
expect(await dlog.operate((r) async => r.length), isZero);
await dlog.close();
await dlog.close();
// Operate should fail
await expectLater(() async => dlog.operate((r) async => r.length),
throwsA(isA<StateError>()));
}
};
Future<void> Function() makeTestDHTLogAddTruncate({required int stride}) =>
() async {
final startTime = DateTime.now();
final dlog = await DHTLog.create(
debugName: 'log_add 1 stride $stride', stride: stride);
final dataset = Iterable<int>.generate(1000)
.map((n) => utf8.encode('elem $n'))
.toList();
print('adding\n');
{
final res = await dlog.operateAppend((w) async {
const chunk = 50;
for (var n = 0; n < dataset.length; n += chunk) {
print('$n-${n + chunk - 1} ');
final success =
await w.tryAppendItems(dataset.sublist(n, n + chunk));
expect(success, isTrue);
}
});
expect(res, isNull);
}
print('get all\n');
{
final dataset2 = await dlog.operate((r) async => r.getItemRange(0));
expect(dataset2, equals(dataset));
}
{
final dataset3 =
await dlog.operate((r) async => r.getItemRange(64, length: 128));
expect(dataset3, equals(dataset.sublist(64, 64 + 128)));
}
{
final dataset4 =
await dlog.operate((r) async => r.getItemRange(0, length: 1000));
expect(dataset4, equals(dataset.sublist(0, 1000)));
}
{
final dataset5 =
await dlog.operate((r) async => r.getItemRange(500, length: 499));
expect(dataset5, equals(dataset.sublist(500, 999)));
}
print('truncate\n');
{
await dlog.operateAppend((w) async => w.truncate(5));
}
{
final dataset6 = await dlog
.operate((r) async => r.getItemRange(500 - 5, length: 499));
expect(dataset6, equals(dataset.sublist(500, 999)));
}
print('truncate 2\n');
{
await dlog.operateAppend((w) async => w.truncate(251));
}
{
final dataset7 = await dlog
.operate((r) async => r.getItemRange(500 - 256, length: 499));
expect(dataset7, equals(dataset.sublist(500, 999)));
}
print('clear\n');
{
await dlog.operateAppend((w) async => w.clear());
}
print('get all\n');
{
final dataset8 = await dlog.operate((r) async => r.getItemRange(0));
expect(dataset8, isEmpty);
}
await dlog.delete();
await dlog.close();
final endTime = DateTime.now();
print('Duration: ${endTime.difference(startTime)}');
};

60
packages/veilid_support/example/integration_test/test_dht_record_pool.dart
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@ -151,7 +151,6 @@ Future<void> testDHTRecordDeepCreateDelete() async {
// Make root record
final recroot = await pool.createRecord(debugName: 'test_deep_create_delete');
for (var d = 0; d < numIterations; d++) {
// Make child set 1
var parent = recroot;
final children = <DHTRecord>[];
@ -162,6 +161,19 @@ Future<void> testDHTRecordDeepCreateDelete() async {
parent = child;
}
// Should mark for deletion
expect(await pool.deleteRecord(recroot.key), isFalse);
// Root should still be valid
expect(await pool.isValidRecordKey(recroot.key), isTrue);
// Close root record
await recroot.close();
// Root should still be valid because children still exist
expect(await pool.isValidRecordKey(recroot.key), isTrue);
for (var d = 0; d < numIterations; d++) {
// Make child set 2
final children2 = <DHTRecord>[];
parent = recroot;
@ -171,31 +183,31 @@ Future<void> testDHTRecordDeepCreateDelete() async {
children2.add(child);
parent = child;
}
// Should fail to delete root
await expectLater(
() async => pool.deleteRecord(recroot.key), throwsA(isA<StateError>()));
// Delete child set 2 in reverse order
for (var n = numChildren - 1; n >= 0; n--) {
expect(await pool.deleteRecord(children2[n].key), isFalse);
}
// Root should still be there
expect(await pool.isValidRecordKey(recroot.key), isTrue);
// Close child set 2
await children2.map((c) => c.close()).wait;
// All child set 2 should be invalid
for (final c2 in children2) {
// Children should be invalid and deleted now
expect(await pool.isValidRecordKey(c2.key), isFalse);
}
// Root should still be valid
expect(await pool.isValidRecordKey(recroot.key), isTrue);
}
// Close child set 1
await children.map((c) => c.close()).wait;
// Delete child set 1 in reverse order
for (var n = numChildren - 1; n >= 0; n--) {
await pool.deleteRecord(children[n].key);
}
// Should fail to delete root
await expectLater(
() async => pool.deleteRecord(recroot.key), throwsA(isA<StateError>()));
// Close child set 1
await children2.map((c) => c.close()).wait;
// Delete child set 2 in reverse order
for (var n = numChildren - 1; n >= 0; n--) {
await pool.deleteRecord(children2[n].key);
}
}
// Should be able to delete root now
await pool.deleteRecord(recroot.key);
// Root should have gone away
expect(await pool.isValidRecordKey(recroot.key), isFalse);
}

38
packages/veilid_support/example/integration_test/test_dht_short_array.dart
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@ -61,10 +61,10 @@ Future<void> Function() makeTestDHTShortArrayAdd({required int stride}) =>
.map((n) => utf8.encode('elem $n'))
.toList();
print('adding\n');
print('adding singles\n');
{
final res = await arr.operateWrite((w) async {
for (var n = 0; n < dataset.length; n++) {
for (var n = 4; n < 8; n++) {
print('$n ');
final success = await w.tryAddItem(dataset[n]);
expect(success, isTrue);
@ -73,6 +73,40 @@ Future<void> Function() makeTestDHTShortArrayAdd({required int stride}) =>
expect(res, isNull);
}
print('adding batch\n');
{
final res = await arr.operateWrite((w) async {
print('${dataset.length ~/ 2}-${dataset.length}');
final success = await w.tryAddItems(
dataset.sublist(dataset.length ~/ 2, dataset.length));
expect(success, isTrue);
});
expect(res, isNull);
}
print('inserting singles\n');
{
final res = await arr.operateWrite((w) async {
for (var n = 0; n < 4; n++) {
print('$n ');
final success = await w.tryInsertItem(n, dataset[n]);
expect(success, isTrue);
}
});
expect(res, isNull);
}
print('inserting batch\n');
{
final res = await arr.operateWrite((w) async {
print('8-${dataset.length ~/ 2}');
final success = await w.tryInsertItems(
8, dataset.sublist(8, dataset.length ~/ 2));
expect(success, isTrue);
});
expect(res, isNull);
}
//print('get all\n');
{
final dataset2 = await arr.operate((r) async => r.getItemRange(0));

1
packages/veilid_support/lib/dht_support/src/dht_log/dht_log.dart
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@ -1,4 +1,5 @@
import 'dart:async';
import 'dart:math';
import 'dart:typed_data';
import 'package:async_tools/async_tools.dart';

60
packages/veilid_support/lib/dht_support/src/dht_log/dht_log_append.dart
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@ -9,34 +9,74 @@ class _DHTLogAppend extends _DHTLogRead implements DHTAppendTruncateRandomRead {
@override
Future<bool> tryAppendItem(Uint8List value) async {
// Allocate empty index at the end of the list
final endPos = _spine.length;
final insertPos = _spine.length;
_spine.allocateTail(1);
final lookup = await _spine.lookupPosition(endPos);
final lookup = await _spine.lookupPosition(insertPos);
if (lookup == null) {
throw StateError("can't write to dht log");
}
// Write item to the segment
return lookup.shortArray
.operateWrite((write) async => write.tryWriteItem(lookup.pos, value));
return lookup.shortArray.operateWrite((write) async {
// If this a new segment, then clear it in case we have wrapped around
if (lookup.pos == 0) {
await write.clear();
} else if (lookup.pos != write.length) {
// We should always be appending at the length
throw StateError('appending should be at the end');
}
return write.tryAddItem(value);
});
}
@override
Future<bool> tryAppendItems(List<Uint8List> values) async {
// Allocate empty index at the end of the list
final insertPos = _spine.length;
_spine.allocateTail(values.length);
// Look up the first position and shortarray
for (var valueIdx = 0; valueIdx < values.length;) {
final remaining = values.length - valueIdx;
final lookup = await _spine.lookupPosition(insertPos + valueIdx);
if (lookup == null) {
throw StateError("can't write to dht log");
}
final sacount = min(remaining, DHTShortArray.maxElements - lookup.pos);
final success = await lookup.shortArray.operateWrite((write) async {
// If this a new segment, then clear it in case we have wrapped around
if (lookup.pos == 0) {
await write.clear();
} else if (lookup.pos != write.length) {
// We should always be appending at the length
throw StateError('appending should be at the end');
}
return write.tryAddItems(values.sublist(valueIdx, valueIdx + sacount));
});
if (!success) {
return false;
}
valueIdx += sacount;
}
return true;
}
@override
Future<void> truncate(int count) async {
final len = _spine.length;
if (count > len) {
count = len;
}
count = min(count, _spine.length);
if (count == 0) {
return;
}
if (count < 0) {
throw StateError('can not remove negative items');
}
_spine.releaseHead(count);
await _spine.releaseHead(count);
}
@override
Future<void> clear() async {
_spine.releaseHead(_spine.length);
await _spine.releaseHead(_spine.length);
}
}

83
packages/veilid_support/lib/dht_support/src/dht_log/dht_log_spine.dart
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@ -83,12 +83,8 @@ class _DHTLogSpine {
Future<void> delete() async {
await _spineMutex.protect(() async {
final pool = DHTRecordPool.instance;
final futures = <Future<void>>[pool.deleteRecord(_spineRecord.key)];
for (final (_, sc) in _spineCache) {
futures.add(sc.delete());
}
await Future.wait(futures);
// Will deep delete all segment records as they are children
await _spineRecord.delete();
});
}
@ -218,7 +214,7 @@ class _DHTLogSpine {
static TypedKey? _getSegmentKey(Uint8List subkeyData, int segment) {
final decodedLength = TypedKey.decodedLength<TypedKey>();
final segmentKeyBytes = subkeyData.sublist(
decodedLength * segment, (decodedLength + 1) * segment);
decodedLength * segment, decodedLength * (segment + 1));
if (segmentKeyBytes.equals(_emptySegmentKey)) {
return null;
}
@ -234,7 +230,7 @@ class _DHTLogSpine {
} else {
segmentKeyBytes = segmentKey.decode();
}
subkeyData.setRange(decodedLength * segment, (decodedLength + 1) * segment,
subkeyData.setRange(decodedLength * segment, decodedLength * (segment + 1),
segmentKeyBytes);
}
@ -435,7 +431,7 @@ class _DHTLogSpine {
_tail = (_tail + count) % _positionLimit;
}
void releaseHead(int count) {
Future<void> releaseHead(int count) async {
assert(_spineMutex.isLocked, 'should be locked');
final currentLength = length;
@ -447,6 +443,73 @@ class _DHTLogSpine {
}
_head = (_head + count) % _positionLimit;
await _purgeUnusedSegments();
}
Future<void> _deleteSegmentsContiguous(int start, int end) async {
assert(_spineMutex.isLocked, 'should be in mutex here');
final startSegmentNumber = start ~/ DHTShortArray.maxElements;
final startSegmentPos = start % DHTShortArray.maxElements;
final endSegmentNumber = end ~/ DHTShortArray.maxElements;
final endSegmentPos = end % DHTShortArray.maxElements;
final firstDeleteSegment =
(startSegmentPos == 0) ? startSegmentNumber : startSegmentNumber + 1;
final lastDeleteSegment =
(endSegmentPos == 0) ? endSegmentNumber - 1 : endSegmentNumber - 2;
int? lastSubkey;
Uint8List? subkeyData;
for (var segmentNumber = firstDeleteSegment;
segmentNumber <= lastDeleteSegment;
segmentNumber++) {
// Lookup what subkey and segment subrange has this position's segment
// shortarray
final l = lookupSegment(segmentNumber);
final subkey = l.subkey;
final segment = l.segment;
if (lastSubkey != subkey) {
// Flush subkey writes
if (lastSubkey != null) {
await _spineRecord.eventualWriteBytes(subkeyData!,
subkey: lastSubkey);
}
xxx debug this, it takes forever
// Get next subkey
subkeyData = await _spineRecord.get(subkey: subkey);
if (subkeyData != null) {
lastSubkey = subkey;
} else {
lastSubkey = null;
}
}
if (subkeyData != null) {
final segmentKey = _getSegmentKey(subkeyData, segment);
if (segmentKey != null) {
await DHTRecordPool.instance.deleteRecord(segmentKey);
_setSegmentKey(subkeyData, segment, null);
}
}
}
// Flush subkey writes
if (lastSubkey != null) {
await _spineRecord.eventualWriteBytes(subkeyData!, subkey: lastSubkey);
}
}
Future<void> _purgeUnusedSegments() async {
assert(_spineMutex.isLocked, 'should be in mutex here');
if (_head < _tail) {
await _deleteSegmentsContiguous(0, _head);
await _deleteSegmentsContiguous(_tail, _positionLimit);
} else if (_head > _tail) {
await _deleteSegmentsContiguous(_tail, _head);
}
}
/////////////////////////////////////////////////////////////////////////////
@ -532,7 +595,7 @@ class _DHTLogSpine {
// Position of the start of the log (oldest items)
int _head;
// Position of the end of the log (newest items)
// Position of the end of the log (newest items) (exclusive)
int _tail;
// LRU cache of DHT spine elements accessed recently

108
packages/veilid_support/lib/dht_support/src/dht_record/dht_record_pool.dart
View File

@ -91,7 +91,6 @@ class SharedDHTRecordData {
Map<int, int> subkeySeqCache = {};
bool needsWatchStateUpdate = false;
WatchState? unionWatchState;
bool deleteOnClose = false;
}
// Per opened record data
@ -128,6 +127,7 @@ class DHTRecordPool with TableDBBackedJson<DHTRecordPoolAllocations> {
: _state = const DHTRecordPoolAllocations(),
_mutex = Mutex(),
_opened = <TypedKey, OpenedRecordInfo>{},
_markedForDelete = <TypedKey>{},
_routingContext = routingContext,
_veilid = veilid;
@ -140,6 +140,8 @@ class DHTRecordPool with TableDBBackedJson<DHTRecordPoolAllocations> {
final Mutex _mutex;
// Which DHT records are currently open
final Map<TypedKey, OpenedRecordInfo> _opened;
// Which DHT records are marked for deletion
final Set<TypedKey> _markedForDelete;
// Default routing context to use for new keys
final VeilidRoutingContext _routingContext;
// Convenience accessor
@ -288,6 +290,8 @@ class DHTRecordPool with TableDBBackedJson<DHTRecordPoolAllocations> {
return openedRecordInfo;
}
// Called when a DHTRecord is closed
// Cleans up the opened record housekeeping and processes any late deletions
Future<void> _recordClosed(DHTRecord record) async {
await _mutex.protect(() async {
final key = record.key;
@ -301,14 +305,37 @@ class DHTRecordPool with TableDBBackedJson<DHTRecordPoolAllocations> {
}
if (openedRecordInfo.records.isEmpty) {
await _routingContext.closeDHTRecord(key);
if (openedRecordInfo.shared.deleteOnClose) {
await _deleteRecordInner(key);
}
_opened.remove(key);
await _checkForLateDeletesInner(key);
}
});
}
// Check to see if this key can finally be deleted
// If any parents are marked for deletion, try them first
Future<void> _checkForLateDeletesInner(TypedKey key) async {
// Get parent list in bottom up order including our own key
final parents = <TypedKey>[];
TypedKey? nextParent = key;
while (nextParent != null) {
parents.add(nextParent);
nextParent = getParentRecordKey(nextParent);
}
// If any parent is ready to delete all its children do it
for (final parent in parents) {
if (_markedForDelete.contains(parent)) {
final deleted = await _deleteRecordInner(parent);
if (!deleted) {
// If we couldn't delete a child then no 'marked for delete' parents
// above us will be ready to delete either
break;
}
}
}
}
// Collect all dependencies (including the record itself)
// in reverse (bottom-up/delete order)
List<TypedKey> _collectChildrenInner(TypedKey recordKey) {
@ -328,7 +355,13 @@ class DHTRecordPool with TableDBBackedJson<DHTRecordPoolAllocations> {
return allDeps.reversedView;
}
String _debugChildren(TypedKey recordKey, {List<TypedKey>? allDeps}) {
/// Collect all dependencies (including the record itself)
/// in reverse (bottom-up/delete order)
Future<List<TypedKey>> collectChildren(TypedKey recordKey) =>
_mutex.protect(() async => _collectChildrenInner(recordKey));
/// Print children
String debugChildren(TypedKey recordKey, {List<TypedKey>? allDeps}) {
allDeps ??= _collectChildrenInner(recordKey);
// ignore: avoid_print
var out =
@ -342,32 +375,48 @@ class DHTRecordPool with TableDBBackedJson<DHTRecordPoolAllocations> {
return out;
}
Future<void> _deleteRecordInner(TypedKey recordKey) async {
log('deleteDHTRecord: key=$recordKey');
// Actual delete function
Future<void> _finalizeDeleteRecordInner(TypedKey recordKey) async {
log('_finalizeDeleteRecordInner: key=$recordKey');
// Remove this child from parents
await _removeDependenciesInner([recordKey]);
await _routingContext.deleteDHTRecord(recordKey);
_markedForDelete.remove(recordKey);
}
Future<void> deleteRecord(TypedKey recordKey) async {
await _mutex.protect(() async {
final allDeps = _collectChildrenInner(recordKey);
if (allDeps.singleOrNull != recordKey) {
final dbgstr = _debugChildren(recordKey, allDeps: allDeps);
throw StateError('must delete children first: $dbgstr');
}
final ori = _opened[recordKey];
if (ori != null) {
// delete after close
ori.shared.deleteOnClose = true;
} else {
// Deep delete mechanism inside mutex
Future<bool> _deleteRecordInner(TypedKey recordKey) async {
final toDelete = _readyForDeleteInner(recordKey);
if (toDelete.isNotEmpty) {
// delete now
await _deleteRecordInner(recordKey);
for (final deleteKey in toDelete) {
await _finalizeDeleteRecordInner(deleteKey);
}
});
return true;
}
// mark for deletion
_markedForDelete.add(recordKey);
return false;
}
/// Delete a record and its children if they are all closed
/// otherwise mark that record for deletion eventually
/// Returns true if the deletion was processed immediately
/// Returns false if the deletion was marked for later
Future<bool> deleteRecord(TypedKey recordKey) async =>
_mutex.protect(() async => _deleteRecordInner(recordKey));
// If everything underneath is closed including itself, return the
// list of children (and itself) to finally actually delete
List<TypedKey> _readyForDeleteInner(TypedKey recordKey) {
final allDeps = _collectChildrenInner(recordKey);
for (final dep in allDeps) {
if (_opened.containsKey(dep)) {
return [];
}
}
return allDeps;
}
void _validateParentInner(TypedKey? parent, TypedKey child) {
@ -456,6 +505,19 @@ class DHTRecordPool with TableDBBackedJson<DHTRecordPoolAllocations> {
}
}
bool _isValidRecordKeyInner(TypedKey key) {
if (_state.rootRecords.contains(key)) {
return true;
}
if (_state.childrenByParent.containsKey(key.toJson())) {
return true;
}
return false;
}
Future<bool> isValidRecordKey(TypedKey key) =>
_mutex.protect(() async => _isValidRecordKeyInner(key));
///////////////////////////////////////////////////////////////////////
/// Create a root DHTRecord that has no dependent records

8
packages/veilid_support/lib/dht_support/src/dht_short_array/dht_short_array_head.dart
View File

@ -67,12 +67,8 @@ class _DHTShortArrayHead {
Future<void> delete() async {
await _headMutex.protect(() async {
final pool = DHTRecordPool.instance;
final futures = <Future<void>>[pool.deleteRecord(_headRecord.key)];
for (final lr in _linkedRecords) {
futures.add(pool.deleteRecord(lr.key));
}
await Future.wait(futures);
// Will deep delete all linked records as they are children
await _headRecord.delete();
});
}

40
packages/veilid_support/lib/dht_support/src/dht_short_array/dht_short_array_write.dart
View File

@ -8,19 +8,12 @@ class _DHTShortArrayWrite extends _DHTShortArrayRead
_DHTShortArrayWrite._(super.head) : super._();
@override
Future<bool> tryAddItem(Uint8List value) async {
// Allocate empty index at the end of the list
final pos = _head.length;
_head.allocateIndex(pos);
Future<bool> tryAddItem(Uint8List value) =>
tryInsertItem(_head.length, value);
// Write item
final ok = await tryWriteItem(pos, value);
if (!ok) {
_head.freeIndex(pos);
}
return ok;
}
@override
Future<bool> tryAddItems(List<Uint8List> values) =>
tryInsertItems(_head.length, values);
@override
Future<bool> tryInsertItem(int pos, Uint8List value) async {
@ -35,6 +28,29 @@ class _DHTShortArrayWrite extends _DHTShortArrayRead
return true;
}
@override
Future<bool> tryInsertItems(int pos, List<Uint8List> values) async {
// Allocate empty indices at the end of the list
for (var i = 0; i < values.length; i++) {
_head.allocateIndex(pos + i);
}
// Write items
var success = true;
final dws = DelayedWaitSet<void>();
for (var i = 0; i < values.length; i++) {
dws.add(() async {
final ok = await tryWriteItem(pos + i, values[i]);
if (!ok) {
_head.freeIndex(pos + i);
success = false;
}
});
}
await dws(chunkSize: maxDHTConcurrency, onChunkDone: (_) => success);
return success;
}
@override
Future<void> swapItem(int aPos, int bPos) async {
if (aPos < 0 || aPos >= _head.length) {

7
packages/veilid_support/lib/dht_support/src/interfaces/dht_append_truncate.dart
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@ -14,6 +14,13 @@ abstract class DHTAppendTruncate {
/// This may throw an exception if the number elements added exceeds limits.
Future<bool> tryAppendItem(Uint8List value);
/// Try to add a list of items to the end of the DHT data structure.
/// Return true if the elements were successfully added, and false if the
/// state changed before the element could be added or a newer value was found
/// on the network.
/// This may throw an exception if the number elements added exceeds limits.
Future<bool> tryAppendItems(List<Uint8List> values);
/// Try to remove a number of items from the head of the DHT data structure.
/// Throws StateError if count < 0
Future<void> truncate(int count);

8
packages/veilid_support/lib/dht_support/src/interfaces/dht_openable.dart
View File

@ -29,12 +29,12 @@ extension DHTOpenableExt<D extends DHTOpenable> on D {
}
try {
final out = await scopeFunction(this);
await close();
return out;
} on Exception catch (_) {
return await scopeFunction(this);
} on Exception {
await delete();
rethrow;
} finally {
await close();
}
}

15
packages/veilid_support/lib/dht_support/src/interfaces/dht_random_write.dart
View File

@ -30,6 +30,13 @@ abstract class DHTRandomWrite {
/// built-in limit of 'maxElements = 256' entries.
Future<bool> tryAddItem(Uint8List value);
/// Try to add a list of items to the end of the DHTArray. Return true if the
/// elements were successfully added, and false if the state changed before
/// the elements could be added or a newer value was found on the network.
/// This may throw an exception if the number elements added exceeds the
/// built-in limit of 'maxElements = 256' entries.
Future<bool> tryAddItems(List<Uint8List> values);
/// Try to insert an item as position 'pos' of the DHTArray.
/// Return true if the element was successfully inserted, and false if the
/// state changed before the element could be inserted or a newer value was
@ -38,6 +45,14 @@ abstract class DHTRandomWrite {
/// built-in limit of 'maxElements = 256' entries.
Future<bool> tryInsertItem(int pos, Uint8List value);
/// Try to insert items at position 'pos' of the DHTArray.
/// Return true if the elements were successfully inserted, and false if the
/// state changed before the elements could be inserted or a newer value was
/// found on the network.
/// This may throw an exception if the number elements added exceeds the
/// built-in limit of 'maxElements = 256' entries.
Future<bool> tryInsertItems(int pos, List<Uint8List> values);
/// Swap items at position 'aPos' and 'bPos' in the DHTArray.
/// Throws IndexError if either of the positions swapped exceed
/// the length of the list