/
sensor.go
executable file
·183 lines (149 loc) · 5.21 KB
/
sensor.go
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package postgis
import (
"database/sql"
"errors"
"fmt"
entities "github.com/gost/core"
gostErrors "github.com/gost/server/errors"
"github.com/gost/server/sensorthings/odata"
)
func sensorParamFactory(values map[string]interface{}) (entities.Entity, error) {
s := &entities.Sensor{}
for as, value := range values {
if value == nil {
continue
}
if as == asMappings[entities.EntityTypeSensor][sensorID] {
s.ID = value
} else if as == asMappings[entities.EntityTypeSensor][sensorName] {
s.Name = value.(string)
} else if as == asMappings[entities.EntityTypeSensor][sensorDescription] {
s.Description = value.(string)
} else if as == asMappings[entities.EntityTypeSensor][sensorEncodingType] {
encodingType := value.(int64)
if encodingType != 0 {
s.EncodingType = entities.EncodingValues[encodingType].Value
}
} else if as == asMappings[entities.EntityTypeSensor][sensorMetadata] {
s.Metadata = value.(string)
}
}
return s, nil
}
// GetSensor return a sensor by id
func (gdb *GostDatabase) GetSensor(id interface{}, qo *odata.QueryOptions) (*entities.Sensor, error) {
intID, ok := ToIntID(id)
if !ok {
return nil, gostErrors.NewRequestNotFound(errors.New("Sensor does not exist"))
}
query, qi := gdb.QueryBuilder.CreateQuery(&entities.Sensor{}, nil, intID, qo)
sensor, err := processSensor(gdb.Db, query, qi)
if err != nil {
return nil, err
}
return sensor, nil
}
// GetSensorByDatastream retrieves a sensor by given datastream
func (gdb *GostDatabase) GetSensorByDatastream(id interface{}, qo *odata.QueryOptions) (*entities.Sensor, error) {
intID, ok := ToIntID(id)
if !ok {
return nil, gostErrors.NewRequestNotFound(errors.New("Datastream does not exist"))
}
query, qi := gdb.QueryBuilder.CreateQuery(&entities.Sensor{}, &entities.Datastream{}, intID, qo)
sensor, err := processSensor(gdb.Db, query, qi)
if err != nil {
return nil, err
}
return sensor, nil
}
// GetSensors retrieves all sensors based on the QueryOptions
func (gdb *GostDatabase) GetSensors(qo *odata.QueryOptions) ([]*entities.Sensor, int, bool, error) {
query, qi := gdb.QueryBuilder.CreateQuery(&entities.Sensor{}, nil, nil, qo)
countSQL := gdb.QueryBuilder.CreateCountQuery(&entities.Sensor{}, nil, nil, qo)
return processSensors(gdb.Db, query, qo, qi, countSQL)
}
func processSensor(db *sql.DB, sql string, qi *QueryParseInfo) (*entities.Sensor, error) {
sensors, _, _, err := processSensors(db, sql, nil, qi, "")
if err != nil {
return nil, err
}
if len(sensors) == 0 {
return nil, gostErrors.NewRequestNotFound(errors.New("Sensor not found"))
}
return sensors[0], nil
}
func processSensors(db *sql.DB, sql string, qo *odata.QueryOptions, qi *QueryParseInfo, countSQL string) ([]*entities.Sensor, int, bool, error) {
data, hasNext, err := ExecuteSelect(db, qi, sql, qo)
if err != nil {
return nil, 0, hasNext, fmt.Errorf("Error executing query %v", err)
}
sensors := make([]*entities.Sensor, 0)
for _, d := range data {
entity := d.(*entities.Sensor)
sensors = append(sensors, entity)
}
var count int
if len(countSQL) > 0 {
count, err = ExecuteSelectCount(db, countSQL)
if err != nil {
return nil, 0, hasNext, fmt.Errorf("Error executing count %v", err)
}
}
return sensors, count, hasNext, nil
}
// PostSensor posts a sensor to the database
func (gdb *GostDatabase) PostSensor(sensor *entities.Sensor) (*entities.Sensor, error) {
var sensorID int
encoding, err1 := entities.CreateEncodingType(sensor.EncodingType)
if err1 != nil {
return nil, err1
}
sql2 := fmt.Sprintf("INSERT INTO %s.sensor (name, description, encodingtype, metadata) VALUES ($1, $2, $3, $4) RETURNING id", gdb.Schema)
err2 := gdb.Db.QueryRow(sql2, sensor.Name, sensor.Description, encoding.Code, sensor.Metadata).Scan(&sensorID)
if err2 != nil {
return nil, err2
}
sensor.ID = sensorID
return sensor, nil
}
// SensorExists checks if a sensor is present in the database based on a given id
func (gdb *GostDatabase) SensorExists(id int) bool {
return EntityExists(gdb, id, "sensor")
}
// PatchSensor updates a sensor in the database
func (gdb *GostDatabase) PatchSensor(id interface{}, s *entities.Sensor) (*entities.Sensor, error) {
var err error
var ok bool
var intID int
updates := make(map[string]interface{})
if intID, ok = ToIntID(id); !ok || !gdb.SensorExists(intID) {
return nil, gostErrors.NewRequestNotFound(errors.New("Sensor does not exist"))
}
if len(s.Name) > 0 {
updates["name"] = s.Name
}
if len(s.Description) > 0 {
updates["description"] = s.Description
}
if len(s.Metadata) > 0 {
updates["metadata"] = s.Metadata
}
if len(s.EncodingType) > 0 {
encoding, _ := entities.CreateEncodingType(s.EncodingType)
updates["encodingtype"] = encoding.Code
}
if err = gdb.updateEntityColumns("sensor", updates, intID); err != nil {
return nil, err
}
ns, _ := gdb.GetSensor(intID, nil)
return ns, nil
}
// PutSensor receives a Sensor entity and changes it in the database
// returns the Sensor
func (gdb *GostDatabase) PutSensor(id interface{}, sensor *entities.Sensor) (*entities.Sensor, error) {
return gdb.PatchSensor(id, sensor)
}
// DeleteSensor tries to delete a Sensor by the given id
func (gdb *GostDatabase) DeleteSensor(id interface{}) error {
return DeleteEntity(gdb, id, "sensor")
}