PKGBUILD/pkg/storage/storage.go

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package storage
import (
"context"
"database/sql"
"fmt"
"net/url"
"path/filepath"
_ "github.com/lib/pq"
"github.com/volker-raschek/flucky/pkg/types"
"github.com/volker-raschek/go-logger/pkg/logger"
)
// Storage is a general interface for a storage endpoint
type Storage interface {
InsertDevice(ctx context.Context, device *types.Device) error
InsertMeasuredValues(ctx context.Context, measuredValues []*types.MeasuredValue) error
InsertSensor(ctx context.Context, sensor *types.Sensor) error
SelectDevice(ctx context.Context, id string) (*types.Device, error)
SelectSensor(ctx context.Context, id string) (*types.Sensor, error)
}
var (
postgresAssetPath = "pkg/storage/postgres"
)
// Postgres implementation
type Postgres struct {
dbo *sql.DB
flogger logger.Logger
}
// InsertDevice into the database
func (postgres *Postgres) InsertDevice(ctx context.Context, device *types.Device) error {
asset := filepath.Join(postgresAssetPath, "insertDevice.sql")
queryBytes, err := Asset(asset)
if err != nil {
return fmt.Errorf("Failed to load asset %v: %v", asset, err)
}
query := string(queryBytes)
tx, err := postgres.dbo.BeginTx(ctx, &sql.TxOptions{ReadOnly: false})
if err != nil {
return fmt.Errorf("Failed to begin new transaction: %v", err)
}
stmt, err := tx.Prepare(query)
if err != nil {
return fmt.Errorf("Failed to prepare statement: %v", err)
}
defer stmt.Close()
_, err = stmt.Exec(&device.ID, &device.Name, &device.Location, &device.CreationDate)
if err != nil {
tx.Rollback()
return fmt.Errorf("Failed to execute statement: %v", err)
}
return tx.Commit()
}
// InsertMeasuredValues into the database
func (postgres *Postgres) InsertMeasuredValues(ctx context.Context, measuredValues []*types.MeasuredValue) error {
splittedMeasuredValues := make(map[string][]*types.MeasuredValue, 0)
for _, measuredValue := range measuredValues {
if _, ok := splittedMeasuredValues[measuredValue.ValueType]; !ok {
splittedMeasuredValues[measuredValue.ValueType] = make([]*types.MeasuredValue, 0)
}
splittedMeasuredValues[measuredValue.ValueType] = append(splittedMeasuredValues[measuredValue.ValueType], measuredValue)
}
tx, err := postgres.dbo.BeginTx(ctx, &sql.TxOptions{ReadOnly: false})
if err != nil {
return fmt.Errorf("Failed to begin new transaction: %v", err)
}
// General insert function
insert := func(tx *sql.Tx, asset string, measuredValues []*types.MeasuredValue) error {
queryBytes, err := Asset(asset)
if err != nil {
return fmt.Errorf("Failed to load asset %v: %v", asset, err)
}
query := string(queryBytes)
stmt, err := tx.Prepare(query)
if err != nil {
return fmt.Errorf("Failed to prepare statement: %v", err)
}
defer stmt.Close()
for _, measuredValue := range measuredValues {
_, err := stmt.Exec(&measuredValue.ID, &measuredValue.Value, &measuredValue.FromDate, &measuredValue.TillDate, &measuredValue.SensorID, &measuredValue.CreationDate, &measuredValue.UpdateDate)
if err != nil {
return fmt.Errorf("Failed to execute statement: %v", err)
}
}
return nil
}
for measuredValueType, measuredValues := range splittedMeasuredValues {
var asset string
switch measuredValueType {
case "humidity":
asset = filepath.Join(postgresAssetPath, "insertHumidity.sql")
case "pressure":
asset = filepath.Join(postgresAssetPath, "insertPressure.sql")
case "temperature":
asset = filepath.Join(postgresAssetPath, "insertTemperature.sql")
default:
tx.Rollback()
return fmt.Errorf("Measured value type %v not supported", measuredValueType)
}
err := insert(tx, asset, measuredValues)
if err != nil {
tx.Rollback()
return err
}
}
return tx.Commit()
}
// InsertSensor into the database
func (postgres *Postgres) InsertSensor(ctx context.Context, sensor *types.Sensor) error {
asset := filepath.Join(postgresAssetPath, "insertSensor.sql")
queryBytes, err := Asset(asset)
if err != nil {
return fmt.Errorf("Failed to load asset %v: %v", asset, err)
}
query := string(queryBytes)
tx, err := postgres.dbo.BeginTx(ctx, &sql.TxOptions{ReadOnly: false})
if err != nil {
return fmt.Errorf("Failed to begin new transaction: %v", err)
}
stmt, err := tx.Prepare(query)
if err != nil {
return fmt.Errorf("Failed to prepare statement: %v", err)
}
defer stmt.Close()
_, err = stmt.Exec(&sensor.ID, &sensor.Name, &sensor.Location, &sensor.WireID, &sensor.I2CBus, &sensor.I2CAddress, &sensor.GPIONumber, &sensor.Model, &sensor.Enabled, &sensor.DeviceID, &sensor.CreationDate)
if err != nil {
tx.Rollback()
return fmt.Errorf("Failed to execute statement: %v", err)
}
return tx.Commit()
}
// SelectDevice from database
func (postgres *Postgres) SelectDevice(ctx context.Context, id string) (*types.Device, error) {
asset := filepath.Join(postgresAssetPath, "selectDeviceByID.sql")
queryBytes, err := Asset(asset)
if err != nil {
return nil, fmt.Errorf("Failed to load asset %v: %v", asset, err)
}
query := string(queryBytes)
tx, err := postgres.dbo.BeginTx(ctx, &sql.TxOptions{ReadOnly: true})
if err != nil {
return nil, fmt.Errorf("Failed to begin new transaction: %v", err)
}
stmt, err := tx.Prepare(query)
if err != nil {
return nil, fmt.Errorf("Failed to prepare statement: %v", err)
}
defer stmt.Close()
row := stmt.QueryRow(id)
device := new(types.Device)
err = row.Scan(&device.ID, &device.Name, &device.Location, &device.CreationDate)
if err != nil {
return nil, fmt.Errorf("Failed to scan row: %v", err)
}
return device, nil
}
// SelectSensor from database
func (postgres *Postgres) SelectSensor(ctx context.Context, id string) (*types.Sensor, error) {
asset := filepath.Join(postgresAssetPath, "selectSensorByID.sql")
queryBytes, err := Asset(asset)
if err != nil {
return nil, fmt.Errorf("Failed to load asset %v: %v", asset, err)
}
query := string(queryBytes)
tx, err := postgres.dbo.BeginTx(ctx, &sql.TxOptions{ReadOnly: true})
if err != nil {
return nil, fmt.Errorf("Failed to begin new transaction: %v", err)
}
stmt, err := tx.Prepare(query)
if err != nil {
return nil, fmt.Errorf("Failed to prepare statement: %v", err)
}
defer stmt.Close()
row := stmt.QueryRow(id)
sensor := new(types.Sensor)
err = row.Scan(&sensor.ID, &sensor.Name, &sensor.Location, &sensor.WireID, &sensor.I2CBus, &sensor.I2CAddress, &sensor.GPIONumber, &sensor.Model, &sensor.Enabled, &sensor.DeviceID, &sensor.CreationDate)
if err != nil {
return nil, fmt.Errorf("Failed to scan row: %v", err)
}
return sensor, nil
}
// New returns a new storage provider
func New(storageEndpoint string, flogger logger.Logger) (Storage, error) {
storageEndpointURL, err := url.Parse(storageEndpoint)
if err != nil {
return nil, err
}
switch storageEndpointURL.Scheme {
case "postgres":
newDBO, err := sql.Open(storageEndpointURL.Scheme, storageEndpointURL.String())
if err != nil {
return nil, err
}
return &Postgres{
dbo: newDBO,
flogger: flogger,
}, nil
default:
return nil, fmt.Errorf("Unsupported database scheme: %v", storageEndpointURL.Scheme)
}
}