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authorLibravatar tobi <31960611+tsmethurst@users.noreply.github.com>2023-05-12 14:33:40 +0200
committerLibravatar GitHub <noreply@github.com>2023-05-12 14:33:40 +0200
commitec325fee141c1e9757144a0a4094061b56839b78 (patch)
tree2948ab4ef5702cc8478ab2be841340b946bdb867 /vendor/github.com/jackc/pgx/v5/pgconn/internal
parent[frogend/bugfix] fix dynamicSpoiler elements (#1771) (diff)
downloadgotosocial-ec325fee141c1e9757144a0a4094061b56839b78.tar.xz
[chore] Update a bunch of database dependencies (#1772)
* [chore] Update a bunch of database dependencies * fix lil thing
Diffstat (limited to 'vendor/github.com/jackc/pgx/v5/pgconn/internal')
-rw-r--r--vendor/github.com/jackc/pgx/v5/pgconn/internal/ctxwatch/context_watcher.go73
1 files changed, 73 insertions, 0 deletions
diff --git a/vendor/github.com/jackc/pgx/v5/pgconn/internal/ctxwatch/context_watcher.go b/vendor/github.com/jackc/pgx/v5/pgconn/internal/ctxwatch/context_watcher.go
new file mode 100644
index 000000000..b39cb3ee5
--- /dev/null
+++ b/vendor/github.com/jackc/pgx/v5/pgconn/internal/ctxwatch/context_watcher.go
@@ -0,0 +1,73 @@
+package ctxwatch
+
+import (
+ "context"
+ "sync"
+)
+
+// ContextWatcher watches a context and performs an action when the context is canceled. It can watch one context at a
+// time.
+type ContextWatcher struct {
+ onCancel func()
+ onUnwatchAfterCancel func()
+ unwatchChan chan struct{}
+
+ lock sync.Mutex
+ watchInProgress bool
+ onCancelWasCalled bool
+}
+
+// NewContextWatcher returns a ContextWatcher. onCancel will be called when a watched context is canceled.
+// OnUnwatchAfterCancel will be called when Unwatch is called and the watched context had already been canceled and
+// onCancel called.
+func NewContextWatcher(onCancel func(), onUnwatchAfterCancel func()) *ContextWatcher {
+ cw := &ContextWatcher{
+ onCancel: onCancel,
+ onUnwatchAfterCancel: onUnwatchAfterCancel,
+ unwatchChan: make(chan struct{}),
+ }
+
+ return cw
+}
+
+// Watch starts watching ctx. If ctx is canceled then the onCancel function passed to NewContextWatcher will be called.
+func (cw *ContextWatcher) Watch(ctx context.Context) {
+ cw.lock.Lock()
+ defer cw.lock.Unlock()
+
+ if cw.watchInProgress {
+ panic("Watch already in progress")
+ }
+
+ cw.onCancelWasCalled = false
+
+ if ctx.Done() != nil {
+ cw.watchInProgress = true
+ go func() {
+ select {
+ case <-ctx.Done():
+ cw.onCancel()
+ cw.onCancelWasCalled = true
+ <-cw.unwatchChan
+ case <-cw.unwatchChan:
+ }
+ }()
+ } else {
+ cw.watchInProgress = false
+ }
+}
+
+// Unwatch stops watching the previously watched context. If the onCancel function passed to NewContextWatcher was
+// called then onUnwatchAfterCancel will also be called.
+func (cw *ContextWatcher) Unwatch() {
+ cw.lock.Lock()
+ defer cw.lock.Unlock()
+
+ if cw.watchInProgress {
+ cw.unwatchChan <- struct{}{}
+ if cw.onCancelWasCalled {
+ cw.onUnwatchAfterCancel()
+ }
+ cw.watchInProgress = false
+ }
+}