From 4c74624228a80c255b033c39d12a1980cf298ca4 Mon Sep 17 00:00:00 2001
From: Donnie Adams <donnie@acorn.io>
Date: Wed, 26 Feb 2025 08:50:21 -0500
Subject: [PATCH] fix: stop locking when reading from triggers

We can read lock when registering a trigger to see if that trigger needs to be
added, and only lock when the trigger needs to be added. This will allow for
more bandwidth when processing objects.

Signed-off-by: Donnie Adams <donnie@acorn.io>
---
 pkg/router/trigger.go | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/pkg/router/trigger.go b/pkg/router/trigger.go
index 8f54464..9e49115 100644
--- a/pkg/router/trigger.go
+++ b/pkg/router/trigger.go
@@ -57,31 +57,53 @@ func (m *triggers) invokeTriggers(req Request) {
 }
 
 func (m *triggers) register(gvk schema.GroupVersionKind, key string, targetGVK schema.GroupVersionKind, mr objectMatcher) {
-	m.lock.Lock()
-	defer m.lock.Unlock()
+	matcherKey := mr.String()
+	if !m.shouldAddTrigger(gvk, key, targetGVK, matcherKey) {
+		return
+	}
 
 	target := enqueueTarget{
 		key: key,
 		gvk: gvk,
 	}
+
+	m.lock.Lock()
+	defer m.lock.Unlock()
+
 	matchers, ok := m.matchers[groupVersionKind{targetGVK}]
 	if !ok {
-		matchers = map[enqueueTarget]map[string]objectMatcher{}
+		matchers = make(map[enqueueTarget]map[string]objectMatcher, 1)
 		m.matchers[groupVersionKind{targetGVK}] = matchers
 	}
 
-	matcherKey := mr.String()
 	if _, ok := matchers[target][matcherKey]; ok {
 		return
 	}
 
 	if matchers[target] == nil {
-		matchers[target] = map[string]objectMatcher{}
+		matchers[target] = make(map[string]objectMatcher, 1)
 	}
 
 	matchers[target][matcherKey] = mr
 }
 
+func (m *triggers) shouldAddTrigger(gvk schema.GroupVersionKind, key string, targetGVK schema.GroupVersionKind, matcherKey string) bool {
+	m.lock.RLock()
+	defer m.lock.RUnlock()
+
+	target := enqueueTarget{
+		key: key,
+		gvk: gvk,
+	}
+	matchers, ok := m.matchers[groupVersionKind{targetGVK}]
+	if !ok {
+		return true
+	}
+
+	_, ok = matchers[target][matcherKey]
+	return !ok
+}
+
 func (m *triggers) Trigger(req Request) {
 	if !req.FromTrigger {
 		m.invokeTriggers(req)