Restructure modules (#1572)

* Move portbase into monorepo

* Add new simple module mgr

* [WIP] Switch to new simple module mgr

* Add StateMgr and more worker variants

* [WIP] Switch more modules

* [WIP] Switch more modules

* [WIP] swtich more modules

* [WIP] switch all SPN modules

* [WIP] switch all service modules

* [WIP] Convert all workers to the new module system

* [WIP] add new task system to module manager

* [WIP] Add second take for scheduling workers

* [WIP] Add FIXME for bugs in new scheduler

* [WIP] Add minor improvements to scheduler

* [WIP] Add new worker scheduler

* [WIP] Fix more bug related to new module system

* [WIP] Fix start handing of the new module system

* [WIP] Improve startup process

* [WIP] Fix minor issues

* [WIP] Fix missing subsystem in settings

* [WIP] Initialize managers in constructor

* [WIP] Move module event initialization to constrictors

* [WIP] Fix setting for enabling and disabling the SPN module

* [WIP] Move API registeration into module construction

* [WIP] Update states mgr for all modules

* [WIP] Add CmdLine operation support

* Add state helper methods to module group and instance

* Add notification and module status handling to status package

* Fix starting issues

* Remove pilot widget and update security lock to new status data

* Remove debug logs

* Improve http server shutdown

* Add workaround for cleanly shutting down firewall+netquery

* Improve logging

* Add syncing states with notifications for new module system

* Improve starting, stopping, shutdown; resolve FIXMEs/TODOs

* [WIP] Fix most unit tests

* Review new module system and fix minor issues

* Push shutdown and restart events again via API

* Set sleep mode via interface

* Update example/template module

* [WIP] Fix spn/cabin unit test

* Remove deprecated UI elements

* Make log output more similar for the logging transition phase

* Switch spn hub and observer cmds to new module system

* Fix log sources

* Make worker mgr less error prone

* Fix tests and minor issues

* Fix observation hub

* Improve shutdown and restart handling

* Split up big connection.go source file

* Move varint and dsd packages to structures repo

* Improve expansion test

* Fix linter warnings

* Fix interception module on windows

* Fix linter errors

---------

Co-authored-by: Vladimir Stoilov <vladimir@safing.io>

base/database/iterator/iterator.go

@@ -0,0 +1,54 @@
+package iterator
+
+import (
+	"sync"
+
+	"github.com/tevino/abool"
+
+	"github.com/safing/portmaster/base/database/record"
+)
+
+// Iterator defines the iterator structure.
+type Iterator struct {
+	Next chan record.Record
+	Done chan struct{}
+
+	errLock    sync.Mutex
+	err        error
+	doneClosed *abool.AtomicBool
+}
+
+// New creates a new Iterator.
+func New() *Iterator {
+	return &Iterator{
+		Next:       make(chan record.Record, 10),
+		Done:       make(chan struct{}),
+		doneClosed: abool.NewBool(false),
+	}
+}
+
+// Finish is called be the storage to signal the end of the query results.
+func (it *Iterator) Finish(err error) {
+	close(it.Next)
+	if it.doneClosed.SetToIf(false, true) {
+		close(it.Done)
+	}
+
+	it.errLock.Lock()
+	defer it.errLock.Unlock()
+	it.err = err
+}
+
+// Cancel is called by the iteration consumer to cancel the running query.
+func (it *Iterator) Cancel() {
+	if it.doneClosed.SetToIf(false, true) {
+		close(it.Done)
+	}
+}
+
+// Err returns the iterator error, if exists.
+func (it *Iterator) Err() error {
+	it.errLock.Lock()
+	defer it.errLock.Unlock()
+	return it.err
+}