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awsathena.go
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awsathena.go
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package sql
import (
"database/sql"
"time"
"github.com/influxdata/flux"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/values"
_ "github.com/uber/athenadriver/go"
)
// AWS Athena support.
// Notes:
// * transactions are not supported by Athena
// * only `sql.from` is supported, as the purpose of the database is to query existing data
// - tables are are typically created like CREATE TABLE ... AS SELECT FROM. It is still possible
// to create external tables CREATE EXTERNAL TABLE ..., but it may be rather tricky.
// - typical insert is INSERT INTO .. SELECT FROM. But INSERT INTO .. (...) VALUES (...) is possible.
// * connection string
// - see https://uber.github.io/athenadriver/ for details
// - minimal connection string contains S3 bucket, access ID, secret key and AWS region
// - the bucket for query results must exist
// - parameters:
// * region - AWS region(eg. us-west-1)
// * db - database name
// * accessID - AWS IAM access ID
// * secretAccessKey - AWS IAM secret key
// * WGRemoteCreation - controls creating of workgroup and tags (true by default)
// * missingAsDefault - controls whether missing data in S3 files are returned with default values
// * missingAsEmptyString - controls whether missing data in S3 files are returned as empty string (default)
// - examples:
// "s3://myorgqueryresults/?accessID=AKIAJLO3F...®ion=us-west-1&secretAccessKey=NnQ7MUMp9PYZsmD47c%2BSsXGOFsd%2F..."
// "s3://myorgqueryresults/?accessID=AKIAJLO3F...&db=dbname&missingAsDefault=false&missingAsEmptyString=false®ion=us-west-1&secretAccessKey=NnQ7MUMp9PYZsmD47c%2BSsXGOFsd%2F...&WGRemoteCreation=false"
type AwsAthenaRowReader struct {
Cursor *sql.Rows
columns []interface{}
columnTypes []flux.ColType
columnNames []string
sqlTypes []*sql.ColumnType
NextFunc func() bool
CloseFunc func() error
}
// Next prepares AwsAthenaRowReader to return rows
func (m *AwsAthenaRowReader) Next() bool {
if m.NextFunc != nil {
return m.NextFunc()
}
next := m.Cursor.Next()
if next {
columnNames, err := m.Cursor.Columns()
if err != nil {
return false
}
m.columns = make([]interface{}, len(columnNames))
columnPointers := make([]interface{}, len(columnNames))
for i := 0; i < len(columnNames); i++ {
columnPointers[i] = &m.columns[i]
}
if err := m.Cursor.Scan(columnPointers...); err != nil {
return false
}
}
return next
}
func (m *AwsAthenaRowReader) GetNextRow() ([]values.Value, error) {
row := make([]values.Value, len(m.columns))
for i, column := range m.columns {
switch value := column.(type) {
case bool, int64, float64:
row[i] = values.New(value)
case int:
row[i] = values.NewInt(int64(value))
case int8:
row[i] = values.NewInt(int64(value))
case int16:
row[i] = values.NewInt(int64(value))
case int32:
row[i] = values.NewInt(int64(value))
case float32:
row[i] = values.NewFloat(float64(value))
case string:
row[i] = values.New(value)
case time.Time:
switch m.sqlTypes[i].DatabaseTypeName() {
case "date":
row[i] = values.NewString(value.Format(layoutDate))
case "time":
row[i] = values.NewString(value.Format(layoutTime))
case "timestamp":
row[i] = values.NewString(value.Format(layoutTimeStampNtz))
default:
row[i] = values.NewTime(values.ConvertTime(value))
}
case nil:
row[i] = values.NewNull(flux.SemanticType(m.columnTypes[i]))
default:
execute.PanicUnknownType(flux.TInvalid)
}
}
return row, nil
}
func (m *AwsAthenaRowReader) InitColumnNames(names []string) {
m.columnNames = names
}
func (m *AwsAthenaRowReader) InitColumnTypes(types []*sql.ColumnType) {
fluxTypes := make([]flux.ColType, len(types))
for i := 0; i < len(types); i++ {
switch types[i].DatabaseTypeName() {
case "tinyint", "smallint", "int", "integer", "bigint":
fluxTypes[i] = flux.TInt
case "float", "double", "real":
fluxTypes[i] = flux.TFloat
case "boolean":
fluxTypes[i] = flux.TBool
case "timestamp with time zone": // "timestamp", "date" and "time" will be represented as string
fluxTypes[i] = flux.TTime
default:
fluxTypes[i] = flux.TString
}
}
m.columnTypes = fluxTypes
m.sqlTypes = types
}
func (m *AwsAthenaRowReader) ColumnNames() []string {
return m.columnNames
}
func (m *AwsAthenaRowReader) ColumnTypes() []flux.ColType {
return m.columnTypes
}
func (m *AwsAthenaRowReader) SetColumnTypes(types []flux.ColType) {
m.columnTypes = types
}
func (m *AwsAthenaRowReader) SetColumns(i []interface{}) {
m.columns = i
}
func (m *AwsAthenaRowReader) Close() error {
if m.CloseFunc != nil {
return m.CloseFunc()
}
if err := m.Cursor.Err(); err != nil {
return err
}
return m.Cursor.Close()
}
func NewAwsAthenaRowReader(r *sql.Rows) (execute.RowReader, error) {
reader := &AwsAthenaRowReader{
Cursor: r,
}
cols, err := r.Columns()
if err != nil {
return nil, err
}
reader.InitColumnNames(cols)
types, err := r.ColumnTypes()
if err != nil {
return nil, err
}
reader.InitColumnTypes(types)
return reader, nil
}