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package main
import (
"database/sql"
"errors"
"fmt"
"strings"
"time"
"github.com/google/uuid"
)
type Snowflake struct {
Name string
Connection *sql.DB
}
func (system Snowflake) getSystemName() (name string) {
return system.Name
}
func newSnowflake(connectionInfo ConnectionInfo) (snowflake Snowflake, err error) {
db, err := openConnectionPool(connectionInfo.Name, connectionInfo.ConnectionString, DriverSnowflake)
if err != nil {
return snowflake, fmt.Errorf("error opening snowflake db :: %v", err)
}
snowflake.Connection = db
snowflake.Name = connectionInfo.Name
return snowflake, nil
}
func (system Snowflake) closeConnectionPool(printError bool) (err error) {
err = system.Connection.Close()
if err != nil && printError {
errorLog.Printf("error closing %v connection pool :: %v", system.Name, err)
}
return err
}
func (system Snowflake) query(query string) (rows *sql.Rows, err error) {
rows, err = system.Connection.Query(query)
if err != nil {
return nil, fmt.Errorf("error running dql on %v :: %v :: %v", system.Name, query, err)
}
return rows, nil
}
func (system Snowflake) queryRow(query string) (row *sql.Row) {
row = system.Connection.QueryRow(query)
return row
}
func (system Snowflake) exec(query string) (err error) {
_, err = system.Connection.Exec(query)
if err != nil {
return fmt.Errorf("error running ddl/dml on %v :: %v :: %v", system.Name, query, err)
}
return nil
}
func (system Snowflake) dropTableIfExistsOverride(schema, table string) (overridden bool, err error) {
return false, nil
}
func (system Snowflake) escape(objectName string) (escaped string) {
return fmt.Sprintf(`"%v"`, objectName)
}
func (system Snowflake) isReservedKeyword(keyword string) bool {
if _, ok := snowflakeReservedKeywords[keyword]; ok {
return true
}
return false
}
func (system Snowflake) createTableIfNotExistsOverride(schema, table string, columnInfos []ColumnInfo, incremental bool) (overridden bool, err error) {
return false, nil
}
func (system Snowflake) driverTypeToPipeType(
columnType *sql.ColumnType,
databaseTypeName string,
) (
pipeType string,
err error,
) {
switch columnType.DatabaseTypeName() {
case "TEXT":
return "nvarchar", nil
case "REAL":
return "float64", nil
case "FIXED":
return "decimal", nil
case "TIMESTAMP_NTZ":
return "datetime", nil
case "TIMESTAMP_LTZ":
return "datetimetz", nil
case "TIMESTAMP_TZ":
return "datetimetz", nil
case "DATE":
return "date", nil
case "TIME":
return "time", nil
case "BINARY":
return "varbinary", nil
case "BOOLEAN":
return "bool", nil
case "VARIANT":
return "nvarchar", nil
case "OBJECT":
return "nvarchar", nil
case "ARRAY":
return "nvarchar", nil
default:
return "", fmt.Errorf("unsupported database type for snowflake: %v", columnType.DatabaseTypeName())
}
}
func (system Snowflake) pipeTypeToCreateType(
columnInfo ColumnInfo,
) (
createType string,
err error,
) {
switch columnInfo.PipeType {
case "nvarchar":
return "text", nil
case "varchar":
return "text", nil
case "ntext":
return "text", nil
case "text":
return "text", nil
case "int64":
return "number", nil
case "int32":
return "number", nil
case "int16":
return "number", nil
case "float64":
return "real", nil
case "float32":
return "real", nil
case "decimal":
return "number", nil
case "money":
return "number", nil
case "datetime":
return "datetime", nil
case "datetimetz":
return "timestamp_tz", nil
case "date":
return "date", nil
case "time":
return "time", nil
case "varbinary":
return "varbinary", nil
case "blob":
return "varbinary", nil
case "uuid":
return "varbinary", nil
case "bool":
return "boolean", nil
case "json":
return "variant", nil
case "xml":
return "text", nil
case "varbit":
return "text", nil
default:
return "", fmt.Errorf("unsupported pipeType for snowflake: %v", columnInfo.PipeType)
}
}
func (system Snowflake) createPipeFilesOverride(pipeFileChannelIn chan PipeFileInfo, columnInfo []ColumnInfo, transfer Transfer, rows *sql.Rows,
) (pipeFileInfoChannel chan PipeFileInfo, overridden bool) {
return pipeFileChannelIn, false
}
func (system Snowflake) getPipeFileFormatters() (
pipeFileFormatters map[string]func(interface{}) (pipeFileValue string, err error),
) {
return map[string]func(interface{}) (pipeFileValue string, err error){
"nvarchar": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"varchar": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"ntext": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"text": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"int64": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%d", v), nil
},
"int32": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%d", v), nil
},
"int16": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%d", v), nil
},
"float64": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%f", v), nil
},
"float32": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%f", v), nil
},
"decimal": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"money": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"datetime": func(v interface{}) (pipeFileValue string, err error) {
valTime, ok := v.(time.Time)
if !ok {
return "", errors.New(
"non time.Time value passed to datetime snowflakePipeFileFormatters")
}
return valTime.Format(time.RFC3339Nano), nil
},
"datetimetz": func(v interface{}) (pipeFileValue string, err error) {
valTime, ok := v.(time.Time)
if !ok {
return "", errors.New(
"non time.Time value passed to datetimetz snowflakePipeFileFormatters")
}
return valTime.UTC().Format(time.RFC3339Nano), nil
},
"date": func(v interface{}) (pipeFileValue string, err error) {
valTime, ok := v.(time.Time)
if !ok {
return "", errors.New(
"non time.Time value passed to date snowflakePipeFileFormatters")
}
return valTime.Format(time.RFC3339Nano), nil
},
"time": func(v interface{}) (pipeFileValue string, err error) {
valTime, ok := v.(time.Time)
if !ok {
return "", errors.New(
"non time.Time value passed to time snowflakePipeFileFormatters")
}
return valTime.Format(time.RFC3339Nano), nil
},
"varbinary": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%x", v), nil
},
"blob": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%x", v), nil
},
"uuid": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"bool": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%t", v), nil
},
"json": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"xml": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
"varbit": func(v interface{}) (pipeFileValue string, err error) {
return fmt.Sprintf("%s", v), nil
},
}
}
func (system Snowflake) insertPipeFilesOverride(columnInfos []ColumnInfo, transfer Transfer, pipeFileInfoChannel <-chan PipeFileInfo, vacuumTable string) (overridden bool, err error) {
table := transfer.TargetTable
escapedSchemaName := escapeIfNeeded(transfer.TargetSchema, system)
fileFormatQuery := fmt.Sprintf(
`CREATE FILE FORMAT if not exists %s.sqlpipe_csv type = CSV ESCAPE_UNENCLOSED_FIELD = 'NONE'
FIELD_OPTIONALLY_ENCLOSED_BY = '\"' NULL_IF = ('%s');`,
escapedSchemaName, transfer.Null)
err = system.exec(fileFormatQuery)
if err != nil {
return true, fmt.Errorf("error creating snowflake file format :: %v", err)
}
infoLog.Printf("created %v.sqlpipe_csv file format if not exists in snowflake", escapedSchemaName)
createStageQuery := fmt.Sprintf(
`CREATE STAGE if not exists %v.sqlpipe_stage;`,
escapedSchemaName)
err = system.exec(createStageQuery)
if err != nil {
return true, fmt.Errorf("error creating sqlpipe_stage in snowflake :: %v", err)
}
infoLog.Printf("created %v.sqlpipe_stage if not exists in snowflake", escapedSchemaName)
finalCsvChannel := convertPipeFiles(pipeFileInfoChannel, columnInfos, transfer, system)
putCsvsChannel := system.putCsvs(finalCsvChannel, transfer)
err = insertFinalCsvs(putCsvsChannel, transfer, system, transfer.TargetSchema, table)
if err != nil {
return true, fmt.Errorf("error inserting final csvs :: %v", err)
}
return true, nil
}
func (system Snowflake) insertFinalCsvsOverride(transfer Transfer) (overridden bool, err error) {
return false, nil
}
func (system Snowflake) convertPipeFilesOverride(pipeFilePath <-chan PipeFileInfo, finalCsvInfoChannelIn chan FinalCsvInfo, transfer Transfer, columnInfos []ColumnInfo,
) (finalCsvInfoChannel chan FinalCsvInfo, overridden bool) {
return finalCsvInfoChannelIn, false
}
func (system Snowflake) putCsvs(
finalCsvChannelIn <-chan FinalCsvInfo,
transfer Transfer,
) <-chan FinalCsvInfo {
finalCsvChannelOut := make(chan FinalCsvInfo)
go func() {
defer close(finalCsvChannelOut)
for finalCsvInfo := range finalCsvChannelIn {
escapedSchema := escapeIfNeeded(transfer.TargetSchema, system)
finalCsvInfo.InsertInfo = fmt.Sprintf("%v.csv", uuid.New().String())
putQuery := fmt.Sprintf(`PUT file://%v @%v.sqlpipe_stage/%v`, finalCsvInfo.FilePath, escapedSchema, finalCsvInfo.InsertInfo)
err := system.exec(putQuery)
if err != nil {
transfer.Error = fmt.Sprintf("error putting csv into snowflake :: %v", err)
transferMap.CancelAndSetStatus(transfer.Id, transfer, StatusError)
errorLog.Println(transfer.Error)
return
}
finalCsvChannelOut <- finalCsvInfo
}
infoLog.Printf("transfer %v finished uploading snowflake csvs", transfer.Id)
}()
return finalCsvChannelOut
}
func (system Snowflake) getFinalCsvFormatters() (
finalCsvFormatters map[string]func(string) (finalCsvValue string, err error),
) {
return map[string]func(string) (string, error){
"nvarchar": func(v string) (string, error) {
return v, nil
},
"varchar": func(v string) (string, error) {
return v, nil
},
"ntext": func(v string) (string, error) {
return v, nil
},
"text": func(v string) (string, error) {
return v, nil
},
"int64": func(v string) (string, error) {
return v, nil
},
"int32": func(v string) (string, error) {
return v, nil
},
"int16": func(v string) (string, error) {
return v, nil
},
"float64": func(v string) (string, error) {
return v, nil
},
"float32": func(v string) (string, error) {
return v, nil
},
"decimal": func(v string) (string, error) {
return v, nil
},
"money": func(v string) (string, error) {
return v, nil
},
"datetime": func(v string) (string, error) {
return v, nil
},
"datetimetz": func(v string) (string, error) {
return v, nil
},
"date": func(v string) (string, error) {
valTime, err := time.Parse(time.RFC3339Nano, v)
if err != nil {
return "", fmt.Errorf("error writing date value to snowflake csv :: %v", err)
}
return valTime.Format("2006-01-02"), nil
},
"time": func(v string) (string, error) {
valTime, err := time.Parse(time.RFC3339Nano, v)
if err != nil {
return "", fmt.Errorf("error writing time value to snowflake csv :: %v", err)
}
return valTime.Format("15:04:05.999999"), nil
},
"varbinary": func(v string) (string, error) {
return v, nil
},
"blob": func(v string) (string, error) {
return v, nil
},
"uuid": func(v string) (string, error) {
return strings.Replace(v, "-", "", -1), nil
},
"bool": func(v string) (string, error) {
return v, nil
},
"json": func(v string) (string, error) {
return v, nil
},
"xml": func(v string) (string, error) {
return v, nil
},
"varbit": func(v string) (string, error) {
return v, nil
},
}
}
func (system Snowflake) runInsertCmd(
finalCsvInfo FinalCsvInfo,
transfer Transfer,
schema, table string,
) (
err error,
) {
escapedSchemaPeriodtable := getSchemaPeriodTable(schema, table, system, true)
escapedSchema := escapeIfNeeded(schema, system)
copyQuery := fmt.Sprintf(`
COPY INTO %v
FROM @%v.sqlpipe_stage/%v
FILE_FORMAT = (FORMAT_NAME = %v.sqlpipe_csv)`,
escapedSchemaPeriodtable,
escapedSchema,
finalCsvInfo.InsertInfo,
escapedSchema,
)
err = system.exec(copyQuery)
if err != nil {
return fmt.Errorf("error copying csv into snowflake :: %v", err)
}
return nil
}
func (system Snowflake) schemaRequired() bool {
return true
}
func (system Snowflake) createSchemaIfNotExistsOverride(schema string) (overridden bool, err error) {
return false, nil
}
var snowflakeReservedKeywords = map[string]bool{
"alter": true,
"and": true,
"as": true,
"between": true,
"by": true,
"case": true,
"cast": true,
"check": true,
"collate": true,
"column": true,
"create": true,
"current_date": true,
"current_time": true,
"current_timestamp": true,
"delete": true,
"desc": true,
"distinct": true,
"drop": true,
"else": true,
"exists": true,
"false": true,
"for": true,
"from": true,
"full": true,
"grant": true,
"group": true,
"having": true,
"in": true,
"inner": true,
"insert": true,
"intersect": true,
"into": true,
"is": true,
"join": true,
"left": true,
"like": true,
"not": true,
"null": true,
"on": true,
"or": true,
"order": true,
"outer": true,
"revoke": true,
"right": true,
"select": true,
"set": true,
"table": true,
"then": true,
"true": true,
"union": true,
"update": true,
"using": true,
"values": true,
"when": true,
"where": true,
"with": true,
}
func (system Snowflake) IsTableNotFoundError(err error) bool {
return strings.Contains(err.Error(), "does not exist")
}
func (system Snowflake) dbTypeToPipeType(
databaseTypeName string,
) (
pipeType string,
err error,
) {
switch databaseTypeName {
case "NUMBER":
return "decimal", nil
case "FLOAT":
return "float64", nil
case "TEXT":
return "nvarchar", nil
case "BINARY":
return "varbinary", nil
case "BOOLEAN":
return "bool", nil
case "DATE":
return "date", nil
case "TIME":
return "time", nil
case "TIMESTAMP_LTZ":
return "datetimetz", nil
case "TIMESTAMP_NTZ":
return "datetime", nil
case "TIMESTAMP_TZ":
return "datetimetz", nil
case "VARIANT":
return "nvarchar", nil
case "OBJECT":
return "varbinary", nil
case "ARRAY":
return "nvarchar", nil
case "GEOGRAPHY":
return "varbinary", nil
case "GEOMETRY":
return "varbinary", nil
default:
return "", fmt.Errorf("unsupported database type for snowflake: %v", databaseTypeName)
}
}
func (system Snowflake) getIncrementalTimeOverride(schema, table, incrementalColumn string, initialLoad bool) (time.Time, bool, bool, error) {
return time.Time{}, false, initialLoad, nil
}
func (system Snowflake) getPrimaryKeysRows(schema, table string) (rows *sql.Rows, err error) {
return nil, errors.New("snowflake does not enforce primary keys")
}
func (system Snowflake) getTableColumnInfosRows(schema, table string) (rows *sql.Rows, err error) {
query := fmt.Sprintf(`
SELECT
columns.COLUMN_NAME AS col_name,
columns.DATA_TYPE AS col_type,
coalesce(columns.NUMERIC_PRECISION, -1) AS col_precision,
coalesce(columns.NUMERIC_SCALE, -1) AS col_scale,
coalesce(columns.CHARACTER_MAXIMUM_LENGTH, -1) AS col_length,
false as is_primary_key
FROM
INFORMATION_SCHEMA.COLUMNS columns
WHERE
upper(columns.TABLE_SCHEMA) = upper('%v')
AND upper(columns.TABLE_NAME) = upper('%v')
ORDER BY
columns.ORDINAL_POSITION;`,
schema, table)
rows, err = system.query(query)
if err != nil {
return nil, fmt.Errorf("error getting table column infos rows :: %v", err)
}
return rows, nil
}
var snowflakeDatetimeFormatter = "2006-01-02 15:04:05.999999999"
var snowflakeDateFormatter = "2006-01-02"
var snowflakeTimeFormatter = "15:04:05.999999999"
func (system Snowflake) getSqlFormatters() (
pipeFileFormatters map[string]func(string) (pipeFileValue string, err error),
) {
return map[string]func(string) (pipeFileValue string, err error){
"nvarchar": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf("'%v'", singleQuoteReplacer.Replace(v)), nil
},
"varchar": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf("'%v'", singleQuoteReplacer.Replace(v)), nil
},
"ntext": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf("'%v'", singleQuoteReplacer.Replace(v)), nil
},
"text": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf("'%v'", singleQuoteReplacer.Replace(v)), nil
},
"int64": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"int32": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"int16": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"float64": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"float32": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"decimal": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"money": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"datetime": func(v string) (pipeFileValue string, err error) {
valTime, err := time.Parse(time.RFC3339Nano, v)
if err != nil {
return "", fmt.Errorf("error writing date value to snowflake csv :: %v", err)
}
return fmt.Sprintf("'%v'", valTime.Format(snowflakeDatetimeFormatter)), nil
},
"datetimetz": func(v string) (pipeFileValue string, err error) {
valTime, err := time.Parse(time.RFC3339Nano, v)
if err != nil {
return "", fmt.Errorf("error writing date value to snowflake csv :: %v", err)
}
return fmt.Sprintf("'%v'", valTime.Format(snowflakeDatetimeFormatter)), nil
},
"date": func(v string) (pipeFileValue string, err error) {
valTime, err := time.Parse(time.RFC3339Nano, v)
if err != nil {
return "", fmt.Errorf("error writing date value to snowflake csv :: %v", err)
}
return fmt.Sprintf("'%v'", valTime.Format(snowflakeDateFormatter)), nil
},
"time": func(v string) (pipeFileValue string, err error) {
valTime, err := time.Parse(time.RFC3339Nano, v)
if err != nil {
return "", fmt.Errorf("error writing date value to snowflake csv :: %v", err)
}
return fmt.Sprintf("'%v'", valTime.Format(snowflakeTimeFormatter)), nil
},
"varbinary": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf(`0x%s`, v), nil
},
"blob": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf(`0x%s`, v), nil
},
"uuid": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"bool": func(v string) (pipeFileValue string, err error) {
return v, nil
},
"json": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf("'%v'", singleQuoteReplacer.Replace(v)), nil
},
"xml": func(v string) (pipeFileValue string, err error) {
return fmt.Sprintf("'%v'", singleQuoteReplacer.Replace(v)), nil
},
"varbit": func(v string) (pipeFileValue string, err error) {
return v, nil
},
}
}