firestore_counter_cache

Firestore Counter Cache

Firestore has limitations on how often one document can be updated + frequent updates add up to costs. So if there is no need in realtime updates, we can cache counter delta in memory and then commit to Firestore.

It is basically a simpler implementation of sync.Map.

Example usage:

// Init cache using one of the methods from caches.go
cache := NewUInt32Cache[string](db, func (k string) string {
    return fmt.Sprintf("collection/%s", k)
}, "Counter field name")
// Atomically add delta. If entry does not exist, it is automatically created
cache.Update("yourawesomeid", 1)
// Commit changes to database (increments fields). May be scheduled to run periodically or invoked when needed
// During commit operation dirty map is locked. This will slow down some operations
cache.Commit(context)

Benchmark:

goos: windows
goarch: amd64
pkg: go-counter-map
cpu: Intel(R) Core(TM) i5-9500F CPU @ 3.00GHz
BenchmarkMultiThread
BenchmarkMultiThread-6          51986534                23.65 ns/op            4 B/op          1 allocs/op
PASS