forked from vmware-archive/atc
/
worker_lifecycle.go
205 lines (174 loc) · 4.4 KB
/
worker_lifecycle.go
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package db
import (
"database/sql"
sq "github.com/Masterminds/squirrel"
)
//go:generate counterfeiter . WorkerLifecycle
type WorkerLifecycle interface {
DeleteUnresponsiveEphemeralWorkers() ([]string, error)
StallUnresponsiveWorkers() ([]string, error)
LandFinishedLandingWorkers() ([]string, error)
DeleteFinishedRetiringWorkers() ([]string, error)
}
type workerLifecycle struct {
conn Conn
}
func NewWorkerLifecycle(conn Conn) WorkerLifecycle {
return &workerLifecycle{
conn: conn,
}
}
func (lifecycle *workerLifecycle) DeleteUnresponsiveEphemeralWorkers() ([]string, error) {
query, args, err := psql.Delete("workers").
Where(sq.Eq{"ephemeral": true}).
Where(sq.Expr("expires < NOW()")).
Suffix("RETURNING name").
ToSql()
if err != nil {
return []string{}, err
}
rows, err := lifecycle.conn.Query(query, args...)
if err != nil {
return nil, err
}
return workersAffected(rows)
}
func (lifecycle *workerLifecycle) StallUnresponsiveWorkers() ([]string, error) {
query, args, err := psql.Update("workers").
SetMap(map[string]interface{}{
"state": string(WorkerStateStalled),
"addr": nil,
"baggageclaim_url": nil,
"expires": nil,
}).
Where(sq.Eq{"state": string(WorkerStateRunning)}).
Where(sq.Expr("expires < NOW()")).
Suffix("RETURNING name").
ToSql()
if err != nil {
return []string{}, err
}
rows, err := lifecycle.conn.Query(query, args...)
if err != nil {
return nil, err
}
return workersAffected(rows)
}
func (lifecycle *workerLifecycle) DeleteFinishedRetiringWorkers() ([]string, error) {
// Squirrel does not have default support for subqueries in where clauses.
// We hacked together a way to do it
//
// First we generate the subquery's SQL and args using
// sq.Select instead of psql.Select so that we get
// unordered placeholders instead of psql's ordered placeholders
subQ, subQArgs, err := sq.Select("w.name").
Distinct().
From("builds b").
Join("containers c ON b.id = c.build_id").
Join("workers w ON w.name = c.worker_name").
LeftJoin("jobs j ON j.id = b.job_id").
Where(sq.Or{
sq.Eq{
"b.status": string(BuildStatusStarted),
},
sq.Eq{
"b.status": string(BuildStatusPending),
},
}).
Where(sq.Or{
sq.Eq{
"j.interruptible": false,
},
sq.Eq{
"b.job_id": nil,
},
}).ToSql()
if err != nil {
return []string{}, err
}
// Then we inject the subquery sql directly into
// the where clause, and "add" the args from the
// first query to the second query's args
//
// We use sq.Delete instead of psql.Delete for the same reason
// but then change the placeholders using .PlaceholderFormat(sq.Dollar)
// to go back to postgres's format
query, args, err := sq.Delete("workers").
Where(sq.Eq{
"state": string(WorkerStateRetiring),
}).
Where("name NOT IN ("+subQ+")", subQArgs...).
PlaceholderFormat(sq.Dollar).
Suffix("RETURNING name").
ToSql()
if err != nil {
return []string{}, err
}
rows, err := lifecycle.conn.Query(query, args...)
if err != nil {
return nil, err
}
return workersAffected(rows)
}
func (lifecycle *workerLifecycle) LandFinishedLandingWorkers() ([]string, error) {
subQ, subQArgs, err := sq.Select("w.name").
Distinct().
From("builds b").
Join("containers c ON b.id = c.build_id").
Join("workers w ON w.name = c.worker_name").
LeftJoin("jobs j ON j.id = b.job_id").
Where(sq.Or{
sq.Eq{
"b.status": string(BuildStatusStarted),
},
sq.Eq{
"b.status": string(BuildStatusPending),
},
}).
Where(sq.Or{
sq.Eq{
"j.interruptible": false,
},
sq.Eq{
"b.job_id": nil,
},
}).ToSql()
if err != nil {
return nil, err
}
query, args, err := sq.Update("workers").
Set("state", string(WorkerStateLanded)).
Set("addr", nil).
Set("baggageclaim_url", nil).
Where(sq.Eq{
"state": string(WorkerStateLanding),
}).
Where("name NOT IN ("+subQ+")", subQArgs...).
PlaceholderFormat(sq.Dollar).
Suffix("RETURNING name").
ToSql()
if err != nil {
return []string{}, err
}
rows, err := lifecycle.conn.Query(query, args...)
if err != nil {
return nil, err
}
return workersAffected(rows)
}
func workersAffected(rows *sql.Rows) ([]string, error) {
var (
err error
workerNames []string
)
defer Close(rows)
for rows.Next() {
var name string
err = rows.Scan(&name)
if err != nil {
return nil, err
}
workerNames = append(workerNames, name)
}
return workerNames, err
}