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connection.go
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connection.go
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package dbsql
import (
"context"
"database/sql/driver"
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"github.com/databricks/databricks-sql-go/driverctx"
dbsqlerr "github.com/databricks/databricks-sql-go/errors"
"github.com/databricks/databricks-sql-go/internal/cli_service"
"github.com/databricks/databricks-sql-go/internal/client"
"github.com/databricks/databricks-sql-go/internal/config"
dbsqlerrint "github.com/databricks/databricks-sql-go/internal/errors"
"github.com/databricks/databricks-sql-go/internal/rows"
"github.com/databricks/databricks-sql-go/internal/sentinel"
"github.com/databricks/databricks-sql-go/logger"
"github.com/pkg/errors"
)
type conn struct {
id string
cfg *config.Config
client cli_service.TCLIService
session *cli_service.TOpenSessionResp
}
// Prepare prepares a statement with the query bound to this connection.
func (c *conn) Prepare(query string) (driver.Stmt, error) {
return &stmt{conn: c, query: query}, nil
}
// PrepareContext prepares a statement with the query bound to this connection.
// Currently, PrepareContext does not use context and is functionally equivalent to Prepare.
func (c *conn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
return &stmt{conn: c, query: query}, nil
}
// Close closes the session.
// sql package maintains a free pool of connections and only calls Close when there's a surplus of idle connections.
func (c *conn) Close() error {
log := logger.WithContext(c.id, "", "")
ctx := driverctx.NewContextWithConnId(context.Background(), c.id)
_, err := c.client.CloseSession(ctx, &cli_service.TCloseSessionReq{
SessionHandle: c.session.SessionHandle,
})
if err != nil {
log.Err(err).Msg("databricks: failed to close connection")
return dbsqlerrint.NewRequestError(ctx, dbsqlerr.ErrCloseConnection, err)
}
return nil
}
// Not supported in Databricks.
func (c *conn) Begin() (driver.Tx, error) {
return nil, dbsqlerrint.NewDriverError(context.TODO(), dbsqlerr.ErrNotImplemented, nil)
}
// Not supported in Databricks.
func (c *conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
return nil, dbsqlerrint.NewDriverError(context.TODO(), dbsqlerr.ErrNotImplemented, nil)
}
// Ping attempts to verify that the server is accessible.
// Returns ErrBadConn if ping fails and consequently DB.Ping will remove the conn from the pool.
func (c *conn) Ping(ctx context.Context) error {
ctx = driverctx.NewContextWithConnId(ctx, c.id)
log, _ := client.LoggerAndContext(ctx, nil)
log.Debug().Msg("databricks: pinging")
ctx1, cancel := context.WithTimeout(ctx, c.cfg.PingTimeout)
defer cancel()
rows, err := c.QueryContext(ctx1, "select 1", nil)
if err != nil {
log.Err(err).Msg("databricks: failed to ping")
return dbsqlerrint.NewBadConnectionError(err)
}
defer rows.Close()
log.Debug().Msg("databricks: ping successful")
return nil
}
// ResetSession is called prior to executing a query on the connection.
// The session with this driver does not have any important state to reset before re-use.
func (c *conn) ResetSession(ctx context.Context) error {
return nil
}
// IsValid signals whether a connection is valid or if it should be discarded.
func (c *conn) IsValid() bool {
return c.session.GetStatus().StatusCode == cli_service.TStatusCode_SUCCESS_STATUS
}
// ExecContext executes a query that doesn't return rows, such
// as an INSERT or UPDATE.
//
// ExecContext honors the context timeout and return when it is canceled.
// Statement ExecContext is the same as connection ExecContext
func (c *conn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
ctx = driverctx.NewContextWithConnId(ctx, c.id)
log, _ := client.LoggerAndContext(ctx, nil)
msg, start := logger.Track("ExecContext")
defer log.Duration(msg, start)
corrId := driverctx.CorrelationIdFromContext(ctx)
exStmtResp, opStatusResp, err := c.runQuery(ctx, query, args)
log, ctx = client.LoggerAndContext(ctx, exStmtResp)
stagingErr := c.execStagingOperation(exStmtResp, ctx)
if exStmtResp != nil && exStmtResp.OperationHandle != nil {
// since we have an operation handle we can close the operation if necessary
alreadyClosed := exStmtResp.DirectResults != nil && exStmtResp.DirectResults.CloseOperation != nil
newCtx := driverctx.NewContextWithCorrelationId(driverctx.NewContextWithConnId(context.Background(), c.id), corrId)
if !alreadyClosed && (opStatusResp == nil || opStatusResp.GetOperationState() != cli_service.TOperationState_CLOSED_STATE) {
_, err1 := c.client.CloseOperation(newCtx, &cli_service.TCloseOperationReq{
OperationHandle: exStmtResp.OperationHandle,
})
if err1 != nil {
log.Err(err1).Msg("databricks: failed to close operation after executing statement")
}
}
}
if err != nil {
log.Err(err).Msgf("databricks: failed to execute query: query %s", query)
return nil, dbsqlerrint.NewExecutionError(ctx, dbsqlerr.ErrQueryExecution, err, opStatusResp)
}
if stagingErr != nil {
log.Err(stagingErr).Msgf("databricks: failed to execute query: query %s", query)
return nil, dbsqlerrint.NewExecutionError(ctx, dbsqlerr.ErrQueryExecution, err, opStatusResp)
}
res := result{AffectedRows: opStatusResp.GetNumModifiedRows()}
return &res, nil
}
// QueryContext executes a query that may return rows, such as a
// SELECT.
//
// QueryContext honors the context timeout and return when it is canceled.
// Statement QueryContext is the same as connection QueryContext
func (c *conn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
ctx = driverctx.NewContextWithConnId(ctx, c.id)
log, _ := client.LoggerAndContext(ctx, nil)
msg, start := log.Track("QueryContext")
// first we try to get the results synchronously.
// at any point in time that the context is done we must cancel and return
exStmtResp, opStatusResp, err := c.runQuery(ctx, query, args)
log, ctx = client.LoggerAndContext(ctx, exStmtResp)
defer log.Duration(msg, start)
if err != nil {
log.Err(err).Msg("databricks: failed to run query") // To log query we need to redact credentials
return nil, dbsqlerrint.NewExecutionError(ctx, dbsqlerr.ErrQueryExecution, err, opStatusResp)
}
corrId := driverctx.CorrelationIdFromContext(ctx)
rows, err := rows.NewRows(c.id, corrId, exStmtResp.OperationHandle, c.client, c.cfg, exStmtResp.DirectResults)
return rows, err
}
func (c *conn) runQuery(ctx context.Context, query string, args []driver.NamedValue) (*cli_service.TExecuteStatementResp, *cli_service.TGetOperationStatusResp, error) {
// first we try to get the results synchronously.
// at any point in time that the context is done we must cancel and return
exStmtResp, err := c.executeStatement(ctx, query, args)
var log *logger.DBSQLLogger
log, ctx = client.LoggerAndContext(ctx, exStmtResp)
if err != nil {
return exStmtResp, nil, err
}
opHandle := exStmtResp.OperationHandle
if exStmtResp.DirectResults != nil {
opStatus := exStmtResp.DirectResults.GetOperationStatus()
switch opStatus.GetOperationState() {
// terminal states
// good
case cli_service.TOperationState_FINISHED_STATE:
return exStmtResp, opStatus, nil
// bad
case cli_service.TOperationState_CANCELED_STATE,
cli_service.TOperationState_CLOSED_STATE,
cli_service.TOperationState_ERROR_STATE,
cli_service.TOperationState_TIMEDOUT_STATE:
logBadQueryState(log, opStatus)
return exStmtResp, opStatus, unexpectedOperationState(opStatus)
// live states
case cli_service.TOperationState_INITIALIZED_STATE,
cli_service.TOperationState_PENDING_STATE,
cli_service.TOperationState_RUNNING_STATE:
statusResp, err := c.pollOperation(ctx, opHandle)
if err != nil {
return exStmtResp, statusResp, err
}
switch statusResp.GetOperationState() {
// terminal states
// good
case cli_service.TOperationState_FINISHED_STATE:
return exStmtResp, statusResp, nil
// bad
case cli_service.TOperationState_CANCELED_STATE,
cli_service.TOperationState_CLOSED_STATE,
cli_service.TOperationState_ERROR_STATE,
cli_service.TOperationState_TIMEDOUT_STATE:
logBadQueryState(log, statusResp)
return exStmtResp, statusResp, unexpectedOperationState(statusResp)
// live states
default:
logBadQueryState(log, statusResp)
return exStmtResp, statusResp, invalidOperationState(ctx, statusResp)
}
// weird states
default:
logBadQueryState(log, opStatus)
return exStmtResp, opStatus, invalidOperationState(ctx, opStatus)
}
} else {
statusResp, err := c.pollOperation(ctx, opHandle)
if err != nil {
return exStmtResp, statusResp, err
}
switch statusResp.GetOperationState() {
// terminal states
// good
case cli_service.TOperationState_FINISHED_STATE:
return exStmtResp, statusResp, nil
// bad
case cli_service.TOperationState_CANCELED_STATE,
cli_service.TOperationState_CLOSED_STATE,
cli_service.TOperationState_ERROR_STATE,
cli_service.TOperationState_TIMEDOUT_STATE:
logBadQueryState(log, statusResp)
return exStmtResp, statusResp, unexpectedOperationState(statusResp)
// live states
default:
logBadQueryState(log, statusResp)
return exStmtResp, statusResp, invalidOperationState(ctx, statusResp)
}
}
}
func logBadQueryState(log *logger.DBSQLLogger, opStatus *cli_service.TGetOperationStatusResp) {
log.Error().Msgf("databricks: query state: %s", opStatus.GetOperationState())
log.Error().Msg(opStatus.GetDisplayMessage())
log.Debug().Msg(opStatus.GetDiagnosticInfo())
}
func unexpectedOperationState(opStatus *cli_service.TGetOperationStatusResp) error {
return errors.WithMessage(errors.New(opStatus.GetDisplayMessage()), dbsqlerr.ErrUnexpectedOperationState(opStatus.GetOperationState().String()))
}
func invalidOperationState(ctx context.Context, opStatus *cli_service.TGetOperationStatusResp) error {
return dbsqlerrint.NewDriverError(ctx, dbsqlerr.ErrInvalidOperationState(opStatus.GetOperationState().String()), nil)
}
func (c *conn) executeStatement(ctx context.Context, query string, args []driver.NamedValue) (*cli_service.TExecuteStatementResp, error) {
ctx = driverctx.NewContextWithConnId(ctx, c.id)
req := cli_service.TExecuteStatementReq{
SessionHandle: c.session.SessionHandle,
Statement: query,
RunAsync: true,
QueryTimeout: int64(c.cfg.QueryTimeout / time.Second),
GetDirectResults: &cli_service.TSparkGetDirectResults{
MaxRows: int64(c.cfg.MaxRows),
},
CanDecompressLZ4Result_: &c.cfg.UseLz4Compression,
Parameters: convertNamedValuesToSparkParams(args),
}
if c.cfg.UseArrowBatches {
req.CanReadArrowResult_ = &c.cfg.UseArrowBatches
req.UseArrowNativeTypes = &cli_service.TSparkArrowTypes{
DecimalAsArrow: &c.cfg.UseArrowNativeDecimal,
TimestampAsArrow: &c.cfg.UseArrowNativeTimestamp,
ComplexTypesAsArrow: &c.cfg.UseArrowNativeComplexTypes,
IntervalTypesAsArrow: &c.cfg.UseArrowNativeIntervalTypes,
}
}
if c.cfg.UseCloudFetch {
req.CanDownloadResult_ = &c.cfg.UseCloudFetch
}
resp, err := c.client.ExecuteStatement(ctx, &req)
var log *logger.DBSQLLogger
log, ctx = client.LoggerAndContext(ctx, resp)
var shouldCancel = func(resp *cli_service.TExecuteStatementResp) bool {
if resp == nil {
return false
}
hasHandle := resp.OperationHandle != nil
isOpen := resp.DirectResults == nil || resp.DirectResults.CloseOperation == nil
return hasHandle && isOpen
}
select {
default:
case <-ctx.Done():
newCtx := driverctx.NewContextFromBackground(ctx)
// in case context is done, we need to cancel the operation if necessary
if err == nil && shouldCancel(resp) {
log.Debug().Msg("databricks: canceling query")
_, err1 := c.client.CancelOperation(newCtx, &cli_service.TCancelOperationReq{
OperationHandle: resp.GetOperationHandle(),
})
if err1 != nil {
log.Err(err1).Msgf("databricks: cancel failed")
} else {
log.Debug().Msgf("databricks: cancel success")
}
} else {
log.Debug().Msg("databricks: query did not need cancellation")
}
return nil, ctx.Err()
}
return resp, err
}
func (c *conn) pollOperation(ctx context.Context, opHandle *cli_service.TOperationHandle) (*cli_service.TGetOperationStatusResp, error) {
corrId := driverctx.CorrelationIdFromContext(ctx)
log := logger.WithContext(c.id, corrId, client.SprintGuid(opHandle.OperationId.GUID))
var statusResp *cli_service.TGetOperationStatusResp
ctx = driverctx.NewContextWithConnId(ctx, c.id)
newCtx := driverctx.NewContextWithCorrelationId(driverctx.NewContextWithConnId(context.Background(), c.id), corrId)
pollSentinel := sentinel.Sentinel{
OnDoneFn: func(statusResp any) (any, error) {
return statusResp, nil
},
StatusFn: func() (sentinel.Done, any, error) {
var err error
log.Debug().Msg("databricks: polling status")
statusResp, err = c.client.GetOperationStatus(newCtx, &cli_service.TGetOperationStatusReq{
OperationHandle: opHandle,
})
if statusResp != nil && statusResp.OperationState != nil {
log.Debug().Msgf("databricks: status %s", statusResp.GetOperationState().String())
}
return func() bool {
if err != nil {
return true
}
switch statusResp.GetOperationState() {
case cli_service.TOperationState_INITIALIZED_STATE,
cli_service.TOperationState_PENDING_STATE,
cli_service.TOperationState_RUNNING_STATE:
return false
default:
log.Debug().Msg("databricks: polling done")
return true
}
}, statusResp, err
},
OnCancelFn: func() (any, error) {
log.Debug().Msg("databricks: sentinel canceling query")
ret, err := c.client.CancelOperation(newCtx, &cli_service.TCancelOperationReq{
OperationHandle: opHandle,
})
return ret, err
},
}
status, resp, err := pollSentinel.Watch(ctx, c.cfg.PollInterval, 0)
if err != nil {
log.Err(err).Msg("error polling operation status")
if status == sentinel.WatchTimeout {
err = dbsqlerrint.NewRequestError(ctx, dbsqlerr.ErrSentinelTimeout, err)
}
return nil, err
}
statusResp, ok := resp.(*cli_service.TGetOperationStatusResp)
if !ok {
return nil, dbsqlerrint.NewDriverError(ctx, dbsqlerr.ErrReadQueryStatus, nil)
}
return statusResp, nil
}
func (c *conn) CheckNamedValue(nv *driver.NamedValue) error {
var err error
if parameter, ok := nv.Value.(Parameter); ok {
nv.Name = parameter.Name
parameter.Value, err = driver.DefaultParameterConverter.ConvertValue(parameter.Value)
return err
}
nv.Value, err = driver.DefaultParameterConverter.ConvertValue(nv.Value)
return err
}
var _ driver.Conn = (*conn)(nil)
var _ driver.Pinger = (*conn)(nil)
var _ driver.SessionResetter = (*conn)(nil)
var _ driver.Validator = (*conn)(nil)
var _ driver.ExecerContext = (*conn)(nil)
var _ driver.QueryerContext = (*conn)(nil)
var _ driver.ConnPrepareContext = (*conn)(nil)
var _ driver.ConnBeginTx = (*conn)(nil)
var _ driver.NamedValueChecker = (*conn)(nil)
func Succeeded(response *http.Response) bool {
if response.StatusCode == 200 || response.StatusCode == 201 || response.StatusCode == 202 || response.StatusCode == 204 {
return true
}
return false
}
func (c *conn) handleStagingPut(ctx context.Context, presignedUrl string, headers map[string]string, localFile string) dbsqlerr.DBError {
if localFile == "" {
return dbsqlerrint.NewDriverError(ctx, "cannot perform PUT without specifying a local_file", nil)
}
client := &http.Client{}
dat, err := os.Open(localFile)
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error reading local file", err)
}
defer dat.Close()
info, err := dat.Stat()
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error reading local file info", err)
}
req, _ := http.NewRequest("PUT", presignedUrl, dat)
req.ContentLength = info.Size() // backend actually requires content length to be known
for k, v := range headers {
req.Header.Set(k, v)
}
res, err := client.Do(req)
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error sending http request", err)
}
defer res.Body.Close()
content, err := io.ReadAll(res.Body)
if err != nil || !Succeeded(res) {
return dbsqlerrint.NewDriverError(ctx, fmt.Sprintf("staging operation over HTTP was unsuccessful: %d-%s", res.StatusCode, content), nil)
}
return nil
}
func (c *conn) handleStagingGet(ctx context.Context, presignedUrl string, headers map[string]string, localFile string) dbsqlerr.DBError {
if localFile == "" {
return dbsqlerrint.NewDriverError(ctx, "cannot perform GET without specifying a local_file", nil)
}
client := &http.Client{}
req, _ := http.NewRequest("GET", presignedUrl, nil)
for k, v := range headers {
req.Header.Set(k, v)
}
res, err := client.Do(req)
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error sending http request", err)
}
defer res.Body.Close()
content, err := io.ReadAll(res.Body)
if err != nil || !Succeeded(res) {
return dbsqlerrint.NewDriverError(ctx, fmt.Sprintf("staging operation over HTTP was unsuccessful: %d-%s", res.StatusCode, content), nil)
}
err = os.WriteFile(localFile, content, 0644) //nolint:gosec
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error writing local file", err)
}
return nil
}
func (c *conn) handleStagingRemove(ctx context.Context, presignedUrl string, headers map[string]string) dbsqlerr.DBError {
client := &http.Client{}
req, _ := http.NewRequest("DELETE", presignedUrl, nil)
for k, v := range headers {
req.Header.Set(k, v)
}
res, err := client.Do(req)
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error sending http request", err)
}
defer res.Body.Close()
content, err := io.ReadAll(res.Body)
if err != nil || !Succeeded(res) {
return dbsqlerrint.NewDriverError(ctx, fmt.Sprintf("staging operation over HTTP was unsuccessful: %d-%s, nil", res.StatusCode, content), nil)
}
return nil
}
func localPathIsAllowed(stagingAllowedLocalPaths []string, localFile string) bool {
for i := range stagingAllowedLocalPaths {
// Convert both filepaths to absolute paths to avoid potential issues.
//
path, err := filepath.Abs(stagingAllowedLocalPaths[i])
if err != nil {
return false
}
localFile, err := filepath.Abs(localFile)
if err != nil {
return false
}
relativePath, err := filepath.Rel(path, localFile)
if err != nil {
return false
}
if !strings.Contains(relativePath, "../") {
return true
}
}
return false
}
func (c *conn) execStagingOperation(
exStmtResp *cli_service.TExecuteStatementResp,
ctx context.Context) dbsqlerr.DBError {
if exStmtResp == nil || exStmtResp.OperationHandle == nil {
return nil
}
corrId := driverctx.CorrelationIdFromContext(ctx)
var row driver.Rows
var err error
var isStagingOperation bool
if exStmtResp.DirectResults != nil && exStmtResp.DirectResults.ResultSetMetadata != nil && exStmtResp.DirectResults.ResultSetMetadata.IsStagingOperation != nil {
isStagingOperation = *exStmtResp.DirectResults.ResultSetMetadata.IsStagingOperation
} else {
req := cli_service.TGetResultSetMetadataReq{
OperationHandle: exStmtResp.OperationHandle,
}
resp, err := c.client.GetResultSetMetadata(ctx, &req)
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error performing staging operation", err)
}
isStagingOperation = *resp.IsStagingOperation
}
if !isStagingOperation {
return nil
}
if len(driverctx.StagingPathsFromContext(ctx)) != 0 {
row, err = rows.NewRows(c.id, corrId, exStmtResp.OperationHandle, c.client, c.cfg, exStmtResp.DirectResults)
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error reading row.", err)
}
} else {
return dbsqlerrint.NewDriverError(ctx, "staging ctx must be provided.", nil)
}
var sqlRow []driver.Value
colNames := row.Columns()
sqlRow = make([]driver.Value, len(colNames))
err = row.Next(sqlRow)
if err != nil {
return dbsqlerrint.NewDriverError(ctx, "error fetching staging operation results", err)
}
var stringValues []string = make([]string, 4)
for i, val := range sqlRow { // this will either be 3 (remove op) or 4 (put/get) elements
if s, ok := val.(string); ok {
stringValues[i] = s
} else {
return dbsqlerrint.NewDriverError(ctx, "received unexpected response from the server.", nil)
}
}
operation := stringValues[0]
presignedUrl := stringValues[1]
headersByteArr := []byte(stringValues[2])
var headers map[string]string
if err := json.Unmarshal(headersByteArr, &headers); err != nil {
return dbsqlerrint.NewDriverError(ctx, "error parsing server response.", nil)
}
localFile := stringValues[3]
stagingAllowedLocalPaths := driverctx.StagingPathsFromContext(ctx)
switch operation {
case "PUT":
if localPathIsAllowed(stagingAllowedLocalPaths, localFile) {
return c.handleStagingPut(ctx, presignedUrl, headers, localFile)
} else {
return dbsqlerrint.NewDriverError(ctx, "local file operations are restricted to paths within the configured stagingAllowedLocalPath", nil)
}
case "GET":
if localPathIsAllowed(stagingAllowedLocalPaths, localFile) {
return c.handleStagingGet(ctx, presignedUrl, headers, localFile)
} else {
return dbsqlerrint.NewDriverError(ctx, "local file operations are restricted to paths within the configured stagingAllowedLocalPath", nil)
}
case "REMOVE":
return c.handleStagingRemove(ctx, presignedUrl, headers)
default:
return dbsqlerrint.NewDriverError(ctx, fmt.Sprintf("operation %s is not supported. Supported operations are GET, PUT, and REMOVE", operation), nil)
}
}