forked from vmware-archive/atc
/
worker_resource_type.go
122 lines (102 loc) · 3.01 KB
/
worker_resource_type.go
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package db
import (
"database/sql"
"fmt"
sq "github.com/Masterminds/squirrel"
"github.com/lib/pq"
)
type WorkerBaseResourceTypeAlreadyExistsError struct {
WorkerName string
BaseResourceTypeName string
}
func (e WorkerBaseResourceTypeAlreadyExistsError) Error() string {
return fmt.Sprintf("worker '%s' base resource type '%s' already exists", e.WorkerName, e.BaseResourceTypeName)
}
// base_resource_types: <- gced referenced by 0 workers
// | id | type | image | version |
// worker_resource_types: <- synced w/ worker creation
// | worker_name | base_resource_type_id |
// resource_caches: <- gced by cache collector
// | id | resource_cache_id | base_resource_type_id | source_hash | params_hash | version |
type WorkerResourceType struct {
Worker Worker
Image string // The path to the image, e.g. '/opt/concourse/resources/git'.
Version string // The version of the image, e.g. a SHA of the rootfs.
BaseResourceType *BaseResourceType
}
type UsedWorkerResourceType struct {
ID int
Worker Worker
UsedBaseResourceType *UsedBaseResourceType
}
func (wrt WorkerResourceType) FindOrCreate(tx Tx) (*UsedWorkerResourceType, error) {
usedBaseResourceType, err := wrt.BaseResourceType.FindOrCreate(tx)
if err != nil {
return nil, err
}
uwrt, found, err := wrt.find(tx, usedBaseResourceType)
if err != nil {
return nil, err
}
if found {
return uwrt, nil
}
return wrt.create(tx, usedBaseResourceType)
}
func (wrt WorkerResourceType) find(tx Tx, usedBaseResourceType *UsedBaseResourceType) (*UsedWorkerResourceType, bool, error) {
var (
worker_name string
id int
)
err := psql.Select("id", "worker_name").From("worker_base_resource_types").Where(sq.Eq{
"worker_name": wrt.Worker.Name(),
"base_resource_type_id": usedBaseResourceType.ID,
"image": wrt.Image,
"version": wrt.Version,
}).RunWith(tx).QueryRow().Scan(&id, &worker_name)
if err != nil {
if err == sql.ErrNoRows {
return nil, false, nil
}
return nil, false, err
}
return &UsedWorkerResourceType{
ID: id,
Worker: wrt.Worker,
UsedBaseResourceType: usedBaseResourceType,
}, true, nil
}
func (wrt WorkerResourceType) create(tx Tx, usedBaseResourceType *UsedBaseResourceType) (*UsedWorkerResourceType, error) {
var id int
err := psql.Insert("worker_base_resource_types").
Columns(
"worker_name",
"base_resource_type_id",
"image",
"version",
).
Values(
wrt.Worker.Name(),
usedBaseResourceType.ID,
wrt.Image,
wrt.Version,
).
Suffix("RETURNING id").
RunWith(tx).
QueryRow().
Scan(&id)
if err != nil {
if pqErr, ok := err.(*pq.Error); ok && pqErr.Code.Name() == "unique_violation" {
return nil, WorkerBaseResourceTypeAlreadyExistsError{
WorkerName: wrt.Worker.Name(),
BaseResourceTypeName: usedBaseResourceType.Name,
}
}
return nil, err
}
return &UsedWorkerResourceType{
ID: id,
Worker: wrt.Worker,
UsedBaseResourceType: usedBaseResourceType,
}, nil
}