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from.go
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from.go
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package sql
import (
"context"
"database/sql"
"github.com/influxdata/flux"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/memory"
"github.com/influxdata/flux/plan"
"github.com/influxdata/flux/runtime"
_ "github.com/lib/pq"
_ "github.com/vertica/vertica-sql-go"
)
const FromSQLKind = "fromSQL"
// For SQL DATETIME parsing
const layout = "2006-01-02 15:04:05.999999999"
type FromSQLOpSpec struct {
DriverName string `json:"driverName,omitempty"`
DataSourceName string `json:"dataSourceName,omitempty"`
Query string `json:"query,omitempty"`
}
func init() {
fromSQLSignature := runtime.MustLookupBuiltinType("sql", "from")
runtime.RegisterPackageValue("sql", "from", flux.MustValue(flux.FunctionValue(FromSQLKind, createFromSQLOpSpec, fromSQLSignature)))
plan.RegisterProcedureSpec(FromSQLKind, newFromSQLProcedure, FromSQLKind)
execute.RegisterSource(FromSQLKind, createFromSQLSource)
}
func createFromSQLOpSpec(args flux.Arguments, administration *flux.Administration) (flux.OperationSpec, error) {
spec := new(FromSQLOpSpec)
if driverName, err := args.GetRequiredString("driverName"); err != nil {
return nil, err
} else {
spec.DriverName = driverName
}
if dataSourceName, err := args.GetRequiredString("dataSourceName"); err != nil {
return nil, err
} else {
spec.DataSourceName = dataSourceName
}
if query, err := args.GetRequiredString("query"); err != nil {
return nil, err
} else {
spec.Query = query
}
return spec, nil
}
func (s *FromSQLOpSpec) Kind() flux.OperationKind {
return FromSQLKind
}
type FromSQLProcedureSpec struct {
plan.DefaultCost
DriverName string
DataSourceName string
Query string
}
func newFromSQLProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*FromSQLOpSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
return &FromSQLProcedureSpec{
DriverName: spec.DriverName,
DataSourceName: spec.DataSourceName,
Query: spec.Query,
}, nil
}
func (s *FromSQLProcedureSpec) Kind() plan.ProcedureKind {
return FromSQLKind
}
func (s *FromSQLProcedureSpec) Copy() plan.ProcedureSpec {
ns := new(FromSQLProcedureSpec)
ns.DriverName = s.DriverName
ns.DataSourceName = s.DataSourceName
ns.Query = s.Query
return ns
}
func createFromSQLSource(prSpec plan.ProcedureSpec, dsid execute.DatasetID, a execute.Administration) (execute.Source, error) {
spec, ok := prSpec.(*FromSQLProcedureSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", prSpec)
}
// validate the data driver name and source name.
deps := flux.GetDependencies(a.Context())
validator, err := deps.URLValidator()
if err != nil {
return nil, err
}
if err := validateDataSource(validator, spec.DriverName, spec.DataSourceName); err != nil {
return nil, err
}
// Retrieve the row reader implementation for the driver.
var newRowReader func(rows *sql.Rows) (execute.RowReader, error)
switch spec.DriverName {
case "mysql":
newRowReader = NewMySQLRowReader
case "sqlite3":
newRowReader = NewSqliteRowReader
case "postgres", "sqlmock":
newRowReader = NewPostgresRowReader
case "vertica", "vertigo":
newRowReader = NewVerticaRowReader
case "snowflake":
newRowReader = NewSnowflakeRowReader
case "mssql", "sqlserver":
newRowReader = NewMssqlRowReader
case "awsathena":
newRowReader = NewAwsAthenaRowReader
case "bigquery":
newRowReader = NewBigQueryRowReader
case "hdb":
newRowReader = NewHdbRowReader
default:
return nil, errors.Newf(codes.Invalid, "sql driver %s not supported", spec.DriverName)
}
readFn := func(ctx context.Context, rows *sql.Rows) (flux.Table, error) {
reader, err := newRowReader(rows)
if err != nil {
_ = rows.Close()
return nil, err
}
return read(ctx, reader, a.Allocator())
}
iterator := &sqlIterator{spec: spec, id: dsid, read: readFn}
return execute.CreateSourceFromIterator(iterator, dsid)
}
var _ execute.SourceIterator = (*sqlIterator)(nil)
type sqlIterator struct {
spec *FromSQLProcedureSpec
id execute.DatasetID
read func(ctx context.Context, rows *sql.Rows) (flux.Table, error)
}
func (c *sqlIterator) connect(ctx context.Context) (*sql.DB, error) {
db, err := getOpenFunc(c.spec.DriverName, c.spec.DataSourceName)()
if err != nil {
return nil, err
}
if err := db.Ping(); err != nil {
_ = db.Close()
return nil, err
}
return db, nil
}
func (c *sqlIterator) Do(ctx context.Context, f func(flux.Table) error) error {
// Connect to the database so we can execute the query.
db, err := c.connect(ctx)
if err != nil {
return err
}
defer func() { _ = db.Close() }()
rows, err := db.QueryContext(ctx, c.spec.Query)
if err != nil {
return errors.Wrap(err, codes.Invalid)
}
defer func() { _ = rows.Close() }()
table, err := c.read(ctx, rows)
if err != nil {
return err
}
return f(table)
}
// read will use the RowReader to construct a flux.Table.
func read(ctx context.Context, reader execute.RowReader, alloc memory.Allocator) (flux.Table, error) {
// Ensure that the reader is always freed so the underlying
// cursor can be returned.
defer func() { _ = reader.Close() }()
groupKey := execute.NewGroupKey(nil, nil)
builder := execute.NewColListTableBuilder(groupKey, alloc)
for i, dataType := range reader.ColumnTypes() {
if _, err := builder.AddCol(flux.ColMeta{Label: reader.ColumnNames()[i], Type: dataType}); err != nil {
return nil, err
}
}
for reader.Next() {
row, err := reader.GetNextRow()
if err != nil {
return nil, err
}
for i, col := range row {
if err := builder.AppendValue(i, col); err != nil {
return nil, err
}
}
}
// An error may have been encountered while reading.
// This will get reported when we go to close the reader.
if err := reader.Close(); err != nil {
return nil, err
}
return builder.Table()
}