docker/swarmkit

package store

import (
    "strings"

    memdb "github.com/hashicorp/go-memdb"
    "github.com/moby/swarmkit/v2/api"
)

const tableConfig = "config"

func init() {
    register(ObjectStoreConfig{
        Table: &memdb.TableSchema{
            Name: tableConfig,
            Indexes: map[string]*memdb.IndexSchema{
                indexID: {
                    Name:    indexID,
                    Unique:  true,
                    Indexer: api.ConfigIndexerByID{},
                },
                indexName: {
                    Name:    indexName,
                    Unique:  true,
                    Indexer: api.ConfigIndexerByName{},
                },
                indexCustom: {
                    Name:         indexCustom,
                    Indexer:      api.ConfigCustomIndexer{},
                    AllowMissing: true,
                },
            },
        },
        Save: func(tx ReadTx, snapshot *api.StoreSnapshot) error {
            var err error
            snapshot.Configs, err = FindConfigs(tx, All)
            return err
        },
        Restore: func(tx Tx, snapshot *api.StoreSnapshot) error {
            toStoreObj := make([]api.StoreObject, len(snapshot.Configs))
            for i, x := range snapshot.Configs {
                toStoreObj[i] = x
            }
            return RestoreTable(tx, tableConfig, toStoreObj)
        },
        ApplyStoreAction: func(tx Tx, sa api.StoreAction) error {
            switch v := sa.Target.(type) {
            case *api.StoreAction_Config:
                obj := v.Config
                switch sa.Action {
                case api.StoreActionKindCreate:
                    return CreateConfig(tx, obj)
                case api.StoreActionKindUpdate:
                    return UpdateConfig(tx, obj)
                case api.StoreActionKindRemove:
                    return DeleteConfig(tx, obj.ID)
                }
            }
            return errUnknownStoreAction
        },
    })
}

// CreateConfig adds a new config to the store.
// Returns ErrExist if the ID is already taken.
func CreateConfig(tx Tx, c *api.Config) error {
    // Ensure the name is not already in use.
    if tx.lookup(tableConfig, indexName, strings.ToLower(c.Spec.Annotations.Name)) != nil {
        return ErrNameConflict
    }

    return tx.create(tableConfig, c)
}

// UpdateConfig updates an existing config in the store.
// Returns ErrNotExist if the config doesn't exist.
func UpdateConfig(tx Tx, c *api.Config) error {
    // Ensure the name is either not in use or already used by this same Config.
    if existing := tx.lookup(tableConfig, indexName, strings.ToLower(c.Spec.Annotations.Name)); existing != nil {
        if existing.GetID() != c.ID {
            return ErrNameConflict
        }
    }

    return tx.update(tableConfig, c)
}

// DeleteConfig removes a config from the store.
// Returns ErrNotExist if the config doesn't exist.
func DeleteConfig(tx Tx, id string) error {
    return tx.delete(tableConfig, id)
}

// GetConfig looks up a config by ID.
// Returns nil if the config doesn't exist.
func GetConfig(tx ReadTx, id string) *api.Config {
    c := tx.get(tableConfig, id)
    if c == nil {
        return nil
    }
    return c.(*api.Config)
}

// FindConfigs selects a set of configs and returns them.
func FindConfigs(tx ReadTx, by By) ([]*api.Config, error) {
    checkType := func(by By) error {
        switch by.(type) {
        case byName, byNamePrefix, byIDPrefix, byCustom, byCustomPrefix:
            return nil
        default:
            return ErrInvalidFindBy
        }
    }

    configList := []*api.Config{}
    appendResult := func(o api.StoreObject) {
        configList = append(configList, o.(*api.Config))
    }

    err := tx.find(tableConfig, by, checkType, appendResult)
    return configList, err
}