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chore: add PGLocks query to analyze what locks are held in pg#15308
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,119 @@ | ||
package database | ||
import ( | ||
"context" | ||
"fmt" | ||
"reflect" | ||
"sort" | ||
"strings" | ||
"time" | ||
"github.com/jmoiron/sqlx" | ||
"github.com/coder/coder/v2/coderd/util/slice" | ||
) | ||
// PGLock docs see: https://www.postgresql.org/docs/current/view-pg-locks.html#VIEW-PG-LOCKS | ||
type PGLock struct { | ||
// LockType see: https://www.postgresql.org/docs/current/monitoring-stats.html#WAIT-EVENT-LOCK-TABLE | ||
LockType *string `db:"locktype"` | ||
Database *string `db:"database"` // oid | ||
Relation *string `db:"relation"` // oid | ||
RelationName *string `db:"relation_name"` | ||
Page *int `db:"page"` | ||
Tuple *int `db:"tuple"` | ||
VirtualXID *string `db:"virtualxid"` | ||
TransactionID *string `db:"transactionid"` // xid | ||
ClassID *string `db:"classid"` // oid | ||
ObjID *string `db:"objid"` // oid | ||
ObjSubID *int `db:"objsubid"` | ||
VirtualTransaction *string `db:"virtualtransaction"` | ||
PID int `db:"pid"` | ||
Mode *string `db:"mode"` | ||
Granted bool `db:"granted"` | ||
FastPath *bool `db:"fastpath"` | ||
WaitStart *time.Time `db:"waitstart"` | ||
} | ||
func (l PGLock) Equal(b PGLock) bool { | ||
// Lazy, but hope this works | ||
return reflect.DeepEqual(l, b) | ||
} | ||
func (l PGLock) String() string { | ||
granted := "granted" | ||
if !l.Granted { | ||
granted = "waiting" | ||
} | ||
var details string | ||
switch safeString(l.LockType) { | ||
case "relation": | ||
details = "" | ||
case "page": | ||
details = fmt.Sprintf("page=%d", *l.Page) | ||
case "tuple": | ||
details = fmt.Sprintf("page=%d tuple=%d", *l.Page, *l.Tuple) | ||
case "virtualxid": | ||
details = "waiting to acquire virtual tx id lock" | ||
Comment on lines +50 to +57 There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others.Learn more. Will implement this as needed. Not going to be exhaustive here right now | ||
default: | ||
details = "???" | ||
} | ||
return fmt.Sprintf("%d-%5s [%s] %s/%s/%s: %s", | ||
l.PID, | ||
safeString(l.TransactionID), | ||
granted, | ||
safeString(l.RelationName), | ||
safeString(l.LockType), | ||
safeString(l.Mode), | ||
details, | ||
) | ||
} | ||
// PGLocks returns a list of all locks in the database currently in use. | ||
func (q *sqlQuerier) PGLocks(ctx context.Context) (PGLocks, error) { | ||
rows, err := q.sdb.QueryContext(ctx, ` | ||
SELECT | ||
relation::regclass AS relation_name, | ||
* | ||
FROM pg_locks; | ||
`) | ||
if err != nil { | ||
return nil, err | ||
} | ||
defer rows.Close() | ||
var locks []PGLock | ||
err = sqlx.StructScan(rows, &locks) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return locks, err | ||
} | ||
type PGLocks []PGLock | ||
func (l PGLocks) String() string { | ||
// Try to group things together by relation name. | ||
sort.Slice(l, func(i, j int) bool { | ||
return safeString(l[i].RelationName) < safeString(l[j].RelationName) | ||
}) | ||
var out strings.Builder | ||
for i, lock := range l { | ||
if i != 0 { | ||
_, _ = out.WriteString("\n") | ||
} | ||
_, _ = out.WriteString(lock.String()) | ||
} | ||
return out.String() | ||
} | ||
// Difference returns the difference between two sets of locks. | ||
// This is helpful to determine what changed between the two sets. | ||
func (l PGLocks) Difference(to PGLocks) (new PGLocks, removed PGLocks) { | ||
return slice.SymmetricDifferenceFunc(l, to, func(a, b PGLock) bool { | ||
return a.Equal(b) | ||
}) | ||
} |
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