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stmtcache: add new StatementErrored method

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This patch adds a new StatementErrored method to the stmtcache.
This routine MUST be called by users of the cache whenever the
execution of a statement results in an error. This will allow
the cache to make an intelligent decision about whether or not
the statement needs to be purged from the cache.
This commit is contained in:
Ethan Pailes
2020-11-09 08:20:34 -05:00
parent b82b993fa8
commit a885de9c94
3 changed files with 127 additions and 0 deletions
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stmtcache/stmtcache.go
+8
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@@ -20,6 +20,14 @@ type Cache interface {
// Clear removes all entries in the cache. Any prepared statements will be deallocated from the PostgreSQL session.
Clear(ctx context.Context) error
// StatementErrored informs the cache that the given statement resulted in an error when it
// was last used against the database. In some cases, this will cause the cache to flush
// the statement from the cache. It will only do so when the underlying `*pgconn.PgConn`
// is not currently in a transaction. If the connection is in the middle of a transaction,
// the bad statement will instead be flushed during the next call to Get that occurrs outside
// of a transaction.
StatementErrored(ctx context.Context, sql string, err error) error
// Len returns the number of cached prepared statement descriptions.
Len() int