1 files changed, 44 insertions, 1 deletions
diff --git a/internal/cache/util.go b/internal/cache/util.go
index 066e477e9..1ffd72876 100644
--- a/internal/cache/util.go
+++ b/internal/cache/util.go
@@ -17,7 +17,30 @@
 
 package cache
 
-import "github.com/superseriousbusiness/gotosocial/internal/log"
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"codeberg.org/gruf/go-cache/v3/result"
+	errorsv2 "codeberg.org/gruf/go-errors/v2"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
+)
+
+// SentinelError is returned to indicate a non-permanent error return,
+// i.e. a situation in which we do not want a cache a negative result.
+var SentinelError = errors.New("BUG: error should not be returned") //nolint:revive
+
+// ignoreErrors is an error ignoring function capable of being passed to
+// caches, which specifically catches and ignores our sentinel error type.
+func ignoreErrors(err error) bool {
+	return errorsv2.Is(
+		SentinelError,
+		context.DeadlineExceeded,
+		context.Canceled,
+	)
+}
 
 // nocopy when embedded will signal linter to
 // error on pass-by-value of parent struct.
@@ -27,6 +50,26 @@ func (*nocopy) Lock() {}
 
 func (*nocopy) Unlock() {}
 
+// tryStart will attempt to start the given cache only if sweep duration > 0 (sweeping is enabled).
+func tryStart[ValueType any](cache *result.Cache[ValueType], sweep time.Duration) {
+	if sweep > 0 {
+		var z ValueType
+		msg := fmt.Sprintf("starting %T cache", z)
+		tryUntil(msg, 5, func() bool {
+			return cache.Start(sweep)
+		})
+	}
+}
+
+// tryStop will attempt to stop the given cache only if sweep duration > 0 (sweeping is enabled).
+func tryStop[ValueType any](cache *result.Cache[ValueType], sweep time.Duration) {
+	if sweep > 0 {
+		var z ValueType
+		msg := fmt.Sprintf("stopping %T cache", z)
+		tryUntil(msg, 5, cache.Stop)
+	}
+}
+
 // tryUntil will attempt to call 'do' for 'count' attempts, before panicking with 'msg'.
 func tryUntil(msg string, count int, do func() bool) {
 	for i := 0; i < count; i++ {