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152_add_metadata_to_resource_cache.go
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152_add_metadata_to_resource_cache.go
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package migrations
import (
"database/sql"
"encoding/json"
"crypto/sha256"
"fmt"
"github.com/concourse/atc"
"github.com/concourse/atc/db/migration"
)
func AddMetadataToResourceCache(tx migration.LimitedTx) error {
_, err := tx.Exec(`
ALTER TABLE resource_caches
ADD COLUMN metadata text
`)
if err != nil {
return err
}
resourceCacheRows, err := tx.Query(`SELECT
rca.id, version, source_hash, rcfg.base_resource_type_id, rcfg.resource_cache_id
FROM resource_caches rca
LEFT JOIN resource_configs rcfg
ON rca.resource_config_id=rcfg.id`,
)
if err != nil {
return err
}
defer resourceCacheRows.Close()
resourceCacheInfos := []resourceCacheInfo{}
for resourceCacheRows.Next() {
var info resourceCacheInfo
err = resourceCacheRows.Scan(&info.id, &info.version, &info.sourceHash, &info.baseResourceTypeID, &info.resourceCacheID)
if err != nil {
return err
}
resourceCacheInfos = append(resourceCacheInfos, info)
}
resourceTypesRows, err := tx.Query(`SELECT
name, version, config
FROM resource_types`,
)
if err != nil {
return err
}
defer resourceTypesRows.Close()
resourceTypesMap := make(resourceTypesInfo)
for resourceTypesRows.Next() {
var name string
var version sql.NullString
var config string
err = resourceTypesRows.Scan(&name, &version, &config)
if err != nil {
return err
}
var resourceConfig atc.ResourceConfig
err = json.Unmarshal([]byte(config), &resourceConfig)
if err != nil {
return err
}
sourceJSON, err := json.Marshal(resourceConfig.Source)
if err != nil {
return err
}
sourceHash := fmt.Sprintf("%x", sha256.Sum256(sourceJSON))
if !version.Valid {
// version is not set on resource type, ignore it, it does not have cached resources yet
continue
}
resourceTypesMap[resourceTypeInfoKey{
sourceHash: sourceHash,
version: version.String,
}] = name
}
for _, info := range resourceCacheInfos {
var resourceTypeName string
// Base Resource Type
if info.baseResourceTypeID.Valid {
err = tx.QueryRow(
"SELECT name FROM base_resource_types WHERE id = $1",
info.baseResourceTypeID.Int64,
).Scan(&resourceTypeName)
if err != nil {
return err
}
} else {
var parentInfo resourceCacheInfo
err = tx.QueryRow(
`SELECT
rca.id, version, source_hash, rcfg.base_resource_type_id, rcfg.resource_cache_id
FROM resource_caches rca
LEFT JOIN resource_configs rcfg
ON rca.resource_config_id=rcfg.id
WHERE rca.id = $1`,
info.resourceCacheID.Int64,
).Scan(
&parentInfo.id, &parentInfo.version, &parentInfo.sourceHash, &parentInfo.baseResourceTypeID, &parentInfo.resourceCacheID,
)
if err != nil {
return err
}
var ok bool
resourceTypeName, ok = resourceTypesMap[resourceTypeInfoKey{
sourceHash: parentInfo.sourceHash,
version: parentInfo.version,
}]
if !ok {
// the resource type was deleted, while resource cache still exists
continue
}
}
var metadata string
err = tx.QueryRow(
"SELECT metadata FROM versioned_resources vr LEFT JOIN resources r ON vr.resource_id = r.id WHERE source_hash = $1 AND version = $2 AND type = $3",
info.sourceHash,
info.version,
resourceTypeName,
).Scan(&metadata)
if err != nil {
if err == sql.ErrNoRows {
// this is custom resource type, which has resource cache but does not have versioned_resource
continue
}
return err
}
_, err = tx.Exec("UPDATE resource_caches SET metadata = $1 WHERE id = $2", metadata, info.id)
if err != nil {
return err
}
}
return nil
}
type resourceTypesInfo map[resourceTypeInfoKey]string
type resourceTypeInfoKey struct {
sourceHash string
version string
}
type resourceCacheInfo struct {
id int
version string
sourceHash string
baseResourceTypeID sql.NullInt64
resourceCacheID sql.NullInt64
}