database/sql: provide stats on number of open connections to the database.
This change provides a convenient way to monitor database connection pool.
Change-Id: I4b3757855b43f3b254acf9312e2a16e2f87840d0
Reviewed-on: https://go-review.googlesource.com/7950
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/src/database/sql/sql.go b/src/database/sql/sql.go
index 1ce679d..b0e8894 100644
--- a/src/database/sql/sql.go
+++ b/src/database/sql/sql.go
@@ -572,6 +572,22 @@
}
}
+// DBStats contains database statistics.
+type DBStats struct {
+ // OpenConnections is the number of open connections to the database.
+ OpenConnections int
+}
+
+// Stats returns database statistics.
+func (db *DB) Stats() DBStats {
+ db.mu.Lock()
+ stats := DBStats{
+ OpenConnections: db.numOpen,
+ }
+ db.mu.Unlock()
+ return stats
+}
+
// Assumes db.mu is locked.
// If there are connRequests and the connection limit hasn't been reached,
// then tell the connectionOpener to open new connections.
