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obs.go
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obs.go
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package obs
import (
"database/sql"
"errors"
"fmt"
"regexp"
"sort"
"strings"
"time"
_ "github.com/mattn/go-sqlite3"
"github.com/metno/mkharp/internal/harp"
)
type Database struct {
db *sql.DB
obstype string
}
type Data struct {
SID int
Lat float32
Lon float32
Elev int
Observations []Observation
}
func (d *Data) Parameters() ([]harp.Parameter, error) {
encounterdParameters := make(map[string]bool)
for _, obs := range d.Observations {
for parameter := range obs.Data {
encounterdParameters[parameter] = true
}
}
var ret []harp.Parameter
for p := range encounterdParameters {
harpParameter := harp.GetParameter(p)
if harpParameter == nil {
return nil, fmt.Errorf("%s: no such parameter", p)
}
ret = append(ret, *harpParameter)
}
sort.Slice(
ret,
func(i, j int) bool {
return ret[i].Parameter < ret[j].Parameter
},
)
return ret, nil
}
type Observation struct {
ValidDate time.Time
Data map[string]float32
}
func Open(filename, obstype string) (*Database, error) {
db, err := sql.Open("sqlite3", filename)
if err != nil {
return nil, err
}
return &Database{
db: db,
obstype: obstype,
}, nil
}
func Create(filename, obstype string, parameters []harp.Parameter) (*Database, error) {
db, err := Open(filename, obstype)
if err != nil {
return nil, err
}
if err := db.addObstype(obstype, parameters); err != nil {
db.Close()
return nil, err
}
return db, nil
}
func (db *Database) Close() error {
return nil
}
func (db *Database) Add(data Data) error {
var baseStatement strings.Builder
allParameters, err := data.Parameters()
if err != nil {
return err
}
fmt.Fprintf(&baseStatement, "INSERT INTO %s (validdate, SID, lat, lon, elev", strings.ToUpper(db.obstype))
for _, p := range allParameters {
fmt.Fprintf(&baseStatement, ", %s", p.Parameter)
}
fmt.Fprint(&baseStatement, ") VALUES (?, ?, ?, ?, ?")
for range allParameters {
fmt.Fprint(&baseStatement, ", ?")
}
fmt.Fprint(&baseStatement, ")")
tx, err := db.db.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare(baseStatement.String())
if err != nil {
tx.Rollback()
return err
}
for _, obs := range data.Observations {
args := []interface{}{
obs.ValidDate.Unix(),
data.SID,
data.Lat,
data.Lon,
data.Elev,
}
for _, p := range allParameters {
var value interface{}
value, ok := obs.Data[p.Parameter]
if !ok {
value = nil
}
args = append(args, value)
}
if _, err := stmt.Exec(args...); err != nil {
tx.Rollback()
return err
}
}
stmt.Close()
return tx.Commit()
}
var tableNamePattern = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9_]*$`)
func isValidNameInSql(word string) bool {
return tableNamePattern.MatchString(word)
}
func (db *Database) addObstype(obstype string, parameters []harp.Parameter) error {
obstype = strings.ToUpper(obstype)
if !isValidNameInSql(obstype) {
return errors.New("invalid obstype")
}
for _, p := range parameters {
if !isValidNameInSql(p.Parameter) {
return fmt.Errorf("invalid parameter: %s", p.Parameter)
}
}
tx, err := db.db.Begin()
if err != nil {
return err
}
if _, err := tx.Exec(fmt.Sprintf("CREATE TABLE %s_params(parameter TEXT, accum_hours REAL, units TEXT)", obstype)); err != nil {
tx.Rollback()
return err
}
if _, err := tx.Exec(fmt.Sprintf("CREATE UNIQUE INDEX %s_params_parameter ON %s_params(parameter)", obstype, obstype)); err != nil {
return err
}
insertParameters := fmt.Sprintf("INSERT INTO %s_params VALUES (?, ?, ?)", obstype)
for _, p := range parameters {
if _, err := tx.Exec(insertParameters, p.Parameter, p.AccumHours, p.Units); err != nil {
return err
}
}
var mkTable strings.Builder
fmt.Fprintf(&mkTable, "CREATE TABLE %s (validdate REAL, SID INTEGER, lat REAL, lon REAL, elev INTEGER", obstype)
for _, p := range parameters {
fmt.Fprintf(&mkTable, ", %s REAL", p.Parameter)
}
fmt.Fprint(&mkTable, ")")
if _, err := tx.Exec(mkTable.String()); err != nil {
tx.Rollback()
return err
}
if _, err := tx.Exec(fmt.Sprintf("CREATE UNIQUE INDEX %s_SID_validdate ON %s(SID, validdate)", obstype, obstype)); err != nil {
return err
}
return tx.Commit()
}