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get.go
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get.go
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/*******************************************************************************
* Copyright 2019 Dell Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*******************************************************************************/
package device_service
import (
"github.com/edgexfoundry/edgex-go/internal/core/metadata/errors"
"github.com/edgexfoundry/edgex-go/internal/pkg/db"
bootstrapConfig "github.com/edgexfoundry/go-mod-bootstrap/config"
"github.com/edgexfoundry/go-mod-core-contracts/clients/logger"
contract "github.com/edgexfoundry/go-mod-core-contracts/models"
)
// DeviceServiceGetListExecutor retrieves DeviceServices according to parameters defined by the implementation.
type DeviceServiceGetListExecutor interface {
Execute() ([]contract.DeviceService, error)
}
type deviceServiceLoadAll struct {
config bootstrapConfig.ServiceInfo
database DeviceServiceLoader
logger logger.LoggingClient
}
// NewDeviceServiceLoadAll creates a new Executor that retrieves all DeviceService registered.
func NewDeviceServiceLoadAll(cfg bootstrapConfig.ServiceInfo, db DeviceServiceLoader, log logger.LoggingClient) DeviceServiceGetListExecutor {
return deviceServiceLoadAll{config: cfg, database: db, logger: log}
}
// Execute performs an operation that retrieves all DeviceService registered.
func (op deviceServiceLoadAll) Execute() (services []contract.DeviceService, err error) {
services, err = op.database.GetAllDeviceServices()
if err != nil {
op.logger.Error(err.Error())
return
}
if len(services) > op.config.MaxResultCount {
err = errors.NewErrLimitExceeded(op.config.MaxResultCount)
return []contract.DeviceService{}, err
}
return
}
type deviceServiceLoadByAddressable struct {
id string
name string
db DeviceServiceLoader
}
// NewDeviceServiceLoadByAddressableName creates a new Executor that retrieves all DeviceService associated with a given Addressable name.
func NewDeviceServiceLoadByAddressableName(name string, db DeviceServiceLoader) DeviceServiceGetListExecutor {
return deviceServiceLoadByAddressable{name: name, db: db}
}
// NewDeviceServiceLoadByAddressableID creates a new Executor that retrieves all DeviceService associated with a given Addressable ID.
func NewDeviceServiceLoadByAddressableID(id string, db DeviceServiceLoader) DeviceServiceGetListExecutor {
return deviceServiceLoadByAddressable{id: id, db: db}
}
// Execute performs an operation that retrieves all DeviceService associated with a given Addressable.
func (op deviceServiceLoadByAddressable) Execute() ([]contract.DeviceService, error) {
var addr contract.Addressable
var err error
// Check if the Addressable exists
// determine whether we're doing a lookup by ID or name
if op.id != "" {
addr, err = op.db.GetAddressableById(op.id)
if err == db.ErrNotFound {
err = errors.NewErrItemNotFound(op.id)
}
} else {
addr, err = op.db.GetAddressableByName(op.name)
if err == db.ErrNotFound {
err = errors.NewErrItemNotFound(op.name)
}
}
if err != nil {
return nil, err
}
if ds, err := op.db.GetDeviceServicesByAddressableId(addr.Id); err != nil {
return nil, err
} else {
return ds, nil
}
}
// DeviceServiceGetExecutor retrieves DeviceService according to parameters defined by the implementation.
type DeviceServiceGetExecutor interface {
Execute() (contract.DeviceService, error)
}
type deviceServiceLoadById struct {
id string
db DeviceServiceLoader
}
// NewDeviceServiceLoadById creates a new Executor that retrieves the DeviceService associated with a given ID.
func NewDeviceServiceLoadById(id string, db DeviceServiceLoader) DeviceServiceGetExecutor {
return deviceServiceLoadById{id: id, db: db}
}
// Execute performs an operation that retrieves the DeviceService associated with a given ID.
func (op deviceServiceLoadById) Execute() (contract.DeviceService, error) {
ds, err := op.db.GetDeviceServiceById(op.id)
if err != nil {
if err == db.ErrNotFound {
return contract.DeviceService{}, errors.NewErrItemNotFound(op.id)
} else {
return contract.DeviceService{}, err
}
}
return ds, nil
}
type deviceServiceLoadByName struct {
name string
db DeviceServiceLoader
}
// NewDeviceServiceLoadByName creates a new Executor that retrieves the DeviceService associated with a given name.
func NewDeviceServiceLoadByName(name string, db DeviceServiceLoader) DeviceServiceGetExecutor {
return deviceServiceLoadByName{name: name, db: db}
}
// Execute performs an operation that retrieves the DeviceService associated with a given name.
func (op deviceServiceLoadByName) Execute() (contract.DeviceService, error) {
ds, err := op.db.GetDeviceServiceByName(op.name)
if err != nil {
if err == db.ErrNotFound {
return contract.DeviceService{}, errors.NewErrItemNotFound(op.name)
} else {
return contract.DeviceService{}, err
}
}
return ds, nil
}