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conn.go
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conn.go
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package nzgo
import (
"bufio"
"context"
"crypto/md5"
"crypto/sha256"
"database/sql"
"database/sql/driver"
b64 "encoding/base64"
"encoding/binary"
"errors"
"fmt"
"io"
"math"
"net"
"os"
"os/user"
"path"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"unicode"
"unsafe"
"github.com/IBM/nzgo/v12/oid"
)
// Common error types
var (
ErrNotSupported = errors.New("pq: Unsupported command")
ErrInFailedTransaction = errors.New("pq: Could not complete operation in a failed transaction")
ErrSSLNotSupported = errors.New("pq: SSL is not enabled on the server")
ErrSSLKeyHasWorldPermissions = errors.New("pq: Private key file has group or world access. Permissions should be u=rw (0600) or less")
ErrCouldNotDetectUsername = errors.New("pq: Could not detect default username. Please provide one explicitly")
errUnexpectedReady = errors.New("unexpected ReadyForQuery")
errNoRowsAffected = errors.New("no RowsAffected available after the empty statement")
errNoLastInsertID = errors.New("no LastInsertId available after the empty statement")
)
/* NPS handshake version negotiation packet structure */
type HsVersion struct {
opcode int
version int
}
type DbosTupleDesc struct {
version int /* CTable.m_version */
nullsAllowed int /* CTable.nullsAllowed */
sizeWord int /* CTable.m_sizeWord */
sizeWordSize int /* CTable.m_sizeWordSize */
numFixedFields int /* CTable.m_numFixedFields */
numVaryingFields int /* CTable.m_numVaryingFields */
fixedFieldsSize int /* CTable.m_fixedFieldsSize */
maxRecordSize int /* CTable.m_maxRecordSize */
numFields int /* CTable.m_numFields */
field_type []int /* field_t.type */
field_size []int /* field_t.size */
field_trueSize []int /* field_t.trueSize */
field_offset []int /* field_t.offset */
field_physField []int /* field_t.physField */
field_logField []int /* field_t.logField */
field_nullAllowed []int /* field_t.nullAllowed */
field_fixedSize []int /* field_t.fixedSize */
field_springField []int /* field_t.springField */
DateStyle int
EuroDates int
DBcharset int
EnableTime24 int
}
type DATE_STRUCT struct {
year int
month int
day int
}
type TIME_STRUCT struct {
hour uint16
minute uint16
second uint16
}
type timeStamp struct {
tm_year int
tm_mon int
tm_mday int
tm_hour int
tm_min int
tm_sec int
}
type Interval struct {
time int64 /* all time units other than months and years */ // NZ - was double
month int /* months and years, after time for alignment */
}
type TimeTzADT struct {
time int64 // all time units other than months and years
zone int // numeric time zone, in seconds
}
type TIMESTAMP_STRUCT struct {
year int
month int
day int
hour int
minute int
second int
fraction int
}
// External table stuff (copied from nde/client/exttable.h)
const (
EXTAB_SOCK_DATA = 1 + iota // block of records
EXTAB_SOCK_ERROR // error message
EXTAB_SOCK_DONE // normal wrap-up
EXTAB_SOCK_FLUSH // Flush the current buffer/data
)
const (
PGRES_EMPTY_QUERY = 0 + iota
PGRES_COMMAND_OK /* a query command that doesn't return */
/* anything was executed properly by the backend */
PGRES_TUPLES_OK /* a query command that returns tuples */
/* was executed properly by the backend */
PGRES_FIELDS_OK /* field information from a query was successful */
PGRES_END_TUPLES /* all is ok till here; all after this is error */
PGRES_NONFATAL_ERROR
PGRES_FATAL_ERROR
PGRES_BAD_RESPONSE /* an unexpected response was recv'd from the backend */
PGRES_INTERNAL_ERROR /* memory allocation error in driver */
)
const (
NzTypeRecAddr = 1 + iota // !NOTE-bmz need to add this to all switch stmts
NzTypeDouble
NzTypeInt
NzTypeFloat
NzTypeMoney
NzTypeDate
NzTypeNumeric
NzTypeTime
NzTypeTimestamp
NzTypeInterval
NzTypeTimeTz
NzTypeBool
NzTypeInt1
NzTypeBinary
NzTypeChar
NzTypeVarChar
NzDEPR_Text // OBSOLETE 3.0: BLAST Era Large 'text' Object, (Postgres 'text' datatype overload, too)
NzTypeUnknown // corresponds to PG UNKNOWNOID data type - an untyped string literal
NzTypeInt2
NzTypeInt8
NzTypeVarFixedChar
NzTypeGeometry
NzTypeVarBinary
NzDEPR_Blob // OBSOLETE 3.0: BLAST Era Large 'binary' Object
NzTypeNChar
NzTypeNVarChar
NzDEPR_NText // OBSOLETE 3.0: BLAST Era Large 'nchar text' Object
_ // skip 28
_ // skip 29
NzTypeJson // 30
NzTypeJsonb
NzTypeJsonpath
NzTypeLastEntry // KEEP THIS ENTRY LAST - used internally to size an array
)
const (
CONN_NOT_CONNECTED = 0 + iota /* Connection has not been established */
CONN_CONNECTED /* Connection is up and has been established */
CONN_EXECUTING /* the connection is currently executing a statement */
CONN_FETCHING /* the connection is currently executing a select */
CONN_CANCELLED /* the connection is currently cancelling a statement */
)
/* const to datatype string mapping to use in logger */
var dataType = map[int]string{
NzTypeChar: "NzTypeChar",
NzTypeVarChar: "NzTypeVarChar",
NzTypeVarFixedChar: "NzTypeVarFixedChar",
NzTypeGeometry: "NzTypeGeometry",
NzTypeVarBinary: "NzTypeVarBinary",
NzTypeNChar: "NzTypeNChar",
NzTypeNVarChar: "NzTypeNVarChar",
NzTypeJson: "NzTypeJson",
NzTypeJsonb: "NzTypeJsonb",
NzTypeJsonpath: "NzTypeJsonpath",
}
const (
CP_VERSION_1 = 1 + iota
CP_VERSION_2
CP_VERSION_3
CP_VERSION_4
CP_VERSION_5
CP_VERSION_6
)
/* Client type */
const (
NPS_CLIENT = 0 + iota
IPS_CLIENT
)
type HSV2Msg struct {
/* all message have a packet length (int) prepended
* the opcode len is included in the size.
*/
opcode int
payload string
}
/* Authentication types */
const (
AUTH_REQ_OK = 0 + iota
AUTH_REQ_KRB4
AUTH_REQ_KRB5
AUTH_REQ_PASSWORD
AUTH_REQ_CRYPT
AUTH_REQ_MD5
AUTH_REQ_SHA256
)
/*
* This is used by the postmaster and clients in their handshake.
* This indicates type of information being exchanged between NPS and driver.
*/
const (
HSV2_INVALID_OPCODE = 0 + iota
HSV2_CLIENT_BEGIN
HSV2_DB
HSV2_USER
HSV2_OPTIONS
HSV2_TTY
HSV2_REMOTE_PID
HSV2_PRIOR_PID
HSV2_CLIENT_TYPE
HSV2_PROTOCOL
HSV2_HOSTCASE
HSV2_SSL_NEGOTIATE
HSV2_SSL_CONNECT
HSV2_APPNAME
HSV2_CLIENT_OS
HSV2_CLIENT_HOST_NAME
HSV2_CLIENT_OS_USER
HSV2_64BIT_VARLENA_ENABLED
)
const (
HSV2_CLIENT_DONE = 1000 + iota
HSV2_SERVER_BEGIN
HSV2_PWD
HSV2_SERVER_DONE = 2000
)
const (
PG_PROTOCOL_3 = 3 + iota
PG_PROTOCOL_4
PG_PROTOCOL_5
)
//Client Type
const (
NPSCLIENT_TYPE_GOLANG = 12
)
// Driver is the Postgres database driver.
type Driver struct{}
// Open opens a new connection to the database. name is a connection string.
// Most users should only use it through database/sql package from the standard
// library.
func (d *Driver) Open(name string) (c driver.Conn, err error) {
c, err = Open(name)
return c, err
}
func init() {
sql.Register("nzgo", &Driver{})
}
type parameterStatus struct {
// server version in the same format as server_version_num, or 0 if
// unavailable
serverVersion int
// the current location based on the TimeZone value of the session, if
// available
currentLocation *time.Location
}
type transactionStatus byte
const (
txnStatusIdle transactionStatus = 'I'
txnStatusIdleInTransaction transactionStatus = 'T'
txnStatusInFailedTransaction transactionStatus = 'E'
)
func (s transactionStatus) String() string {
switch s {
case txnStatusIdle:
return "idle"
case txnStatusIdleInTransaction:
return "idle in transaction"
case txnStatusInFailedTransaction:
return "in a failed transaction"
default:
msg := fmt.Sprintf("unknown transactionStatus %d", s)
return msg
}
msg := "not reached"
elog.Debugln(msg)
return msg
}
// Dialer is the dialer interface. It can be used to obtain more control over
// how pq creates network connections.
type Dialer interface {
Dial(network, address string) (net.Conn, error)
DialTimeout(network, address string, timeout time.Duration) (net.Conn, error)
}
type DialerContext interface {
DialContext(ctx context.Context, network, address string) (net.Conn, error)
}
type defaultDialer struct {
d net.Dialer
}
func (d defaultDialer) Dial(network, address string) (net.Conn, error) {
return d.d.Dial(network, address)
}
func (d defaultDialer) DialTimeout(network, address string, timeout time.Duration) (net.Conn, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
return d.DialContext(ctx, network, address)
}
func (d defaultDialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
return d.d.DialContext(ctx, network, address)
}
type conn struct {
c net.Conn
buf *bufio.Reader
namei int
scratch [2048]byte
txnStatus transactionStatus
txnFinish func()
// Save connection arguments to use during CancelRequest.
dialer Dialer
opts values
// Cancellation key data for use with CancelRequest messages.
processID int
secretKey int
parameterStatus parameterStatus
saveMessageType byte
saveMessageBuffer []byte
// If true, this connection is bad and all public-facing functions should
// return ErrBadConn.
bad bool
// If set, this connection should never use the binary format when
// receiving query results from prepared statements. Only provided for
// debugging.
disablePreparedBinaryResult bool
// Whether to always send []byte parameters over as binary. Enables single
// round-trip mode for non-prepared Query calls.
binaryParameters bool
// If true this connection is in the middle of a COPY
inCopy bool
//netezza specific
hsVersion int
protocol1 int
protocol2 int
commandNumber int
status int
guardium_clientHostName string
guardium_clientOSUser string
guardium_applName string
guardium_clientOS string
}
// Handle driver-side settings in parsed connection string.
func (cn *conn) handleDriverSettings(o values) (err error) {
boolSetting := func(key string, val *bool) error {
if value, ok := o[key]; ok {
if value == "yes" {
*val = true
} else if value == "no" {
*val = false
} else {
return elog.Fatalf(chopPath(funName()), "unrecognized value %q for %s", value, key)
}
}
return nil
}
err = boolSetting("disable_prepared_binary_result", &cn.disablePreparedBinaryResult)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return err
}
return boolSetting("binary_parameters", &cn.binaryParameters)
}
func (cn *conn) handlePgpass(o values) {
// if a password was supplied, do not process .pgpass
if _, ok := o["password"]; ok {
return
}
filename := os.Getenv("PGPASSFILE")
if filename == "" {
// XXX this code doesn't work on Windows where the default filename is
// XXX %APPDATA%\postgresql\pgpass.conf
// Prefer $HOME over user.Current due to glibc bug: golang.org/issue/13470
userHome := os.Getenv("HOME")
if userHome == "" {
user, err := user.Current()
if err != nil {
return
}
userHome = user.HomeDir
}
filename = filepath.Join(userHome, ".pgpass")
}
fileinfo, err := os.Stat(filename)
if err != nil {
return
}
mode := fileinfo.Mode()
if mode&(0x77) != 0 {
// XXX should warn about incorrect .pgpass permissions as psql does
return
}
file, err := os.Open(filename)
if err != nil {
return
}
defer file.Close()
scanner := bufio.NewScanner(io.Reader(file))
hostname := o["host"]
ntw, _ := network(o)
port := o["port"]
db := o["dbname"]
username := o["user"]
// From: https://github.com/tg/pgpass/blob/master/reader.go
getFields := func(s string) []string {
fs := make([]string, 0, 5)
f := make([]rune, 0, len(s))
var esc bool
for _, c := range s {
switch {
case esc:
f = append(f, c)
esc = false
case c == '\\':
esc = true
case c == ':':
fs = append(fs, string(f))
f = f[:0]
default:
f = append(f, c)
}
}
return append(fs, string(f))
}
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 || line[0] == '#' {
continue
}
split := getFields(line)
if len(split) != 5 {
continue
}
if (split[0] == "*" || split[0] == hostname || (split[0] == "localhost" && (hostname == "" || ntw == "unix"))) && (split[1] == "*" || split[1] == port) && (split[2] == "*" || split[2] == db) && (split[3] == "*" || split[3] == username) {
o["password"] = split[4]
return
}
}
}
func (cn *conn) writeBuf(b byte) *writeBuf {
cn.scratch[0] = b
return &writeBuf{
buf: cn.scratch[:4],
pos: 0,
}
}
// Open opens a new connection to the database. dsn is a connection string.
// Most users should only use it through database/sql package from the standard
// library.
func Open(dsn string) (_ driver.Conn, err error) {
return DialOpen(defaultDialer{}, dsn)
}
// DialOpen opens a new connection to the database using a dialer.
func DialOpen(d Dialer, dsn string) (_ driver.Conn, err error) {
c, err := NewConnector(dsn)
if err != nil {
return nil, err
}
c.dialer = d
return c.open(context.Background())
}
func (c *Connector) open(ctx context.Context) (cn *conn, err error) {
o := c.opts
cn = &conn{
opts: o,
dialer: c.dialer,
}
err = cn.handleDriverSettings(o)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return nil, err
}
cn.handlePgpass(o)
cn.c, err = dial(ctx, c.dialer, o)
if err != nil {
if cn.c != nil {
cn.c.Close()
}
elog.Fatalf(chopPath(funName()), err.Error())
return nil, err
}
cn.buf = bufio.NewReader(cn.c)
err = cn.startup(o)
if err != nil {
return nil, err
}
// reset the deadline, in case one was set (see dial)
if timeout, ok := o["connect_timeout"]; ok && timeout != "0" {
err = cn.c.SetDeadline(time.Time{})
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return cn, err
}
}
return cn, nil
}
func dial(ctx context.Context, d Dialer, o values) (net.Conn, error) {
network, address := network(o)
// SSL is not necessary or supported over UNIX domain sockets
if network == "unix" {
o["sslmode"] = "disable"
}
elog.Debugln("Network ", network)
elog.Debugln("Address ", address)
// Zero or not specified means wait indefinitely.
if timeout, ok := o["connect_timeout"]; ok && timeout != "0" {
seconds, err := strconv.ParseInt(timeout, 10, 0)
if err != nil {
return nil, elog.Fatalf(chopPath(funName()), "invalid value for parameter connect_timeout: %s", err)
}
duration := time.Duration(seconds) * time.Second
// connect_timeout should apply to the entire connection establishment
// procedure, so we both use a timeout for the TCP connection
// establishment and set a deadline for doing the initial handshake.
// The deadline is then reset after startup() is done.
deadline := time.Now().Add(duration)
var conn net.Conn
if dctx, ok := d.(DialerContext); ok {
ctx, cancel := context.WithTimeout(ctx, duration)
defer cancel()
conn, err = dctx.DialContext(ctx, network, address)
} else {
conn, err = d.DialTimeout(network, address, duration)
}
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return nil, err
}
err = conn.SetDeadline(deadline)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return nil, err
}
return conn, nil
}
if dctx, ok := d.(DialerContext); ok {
return dctx.DialContext(ctx, network, address)
}
return d.Dial(network, address)
}
func network(o values) (string, string) {
host := o["host"]
if strings.HasPrefix(host, "/") {
sockPath := path.Join(host, ".s.PGSQL."+o["port"])
return "unix", sockPath
}
return "tcp", net.JoinHostPort(host, o["port"])
}
type values map[string]string
// scanner implements a tokenizer for libpq-style option strings.
type scanner struct {
s []rune
i int
}
// newScanner returns a new scanner initialized with the option string s.
func newScanner(s string) *scanner {
return &scanner{[]rune(s), 0}
}
// Next returns the next rune.
// It returns 0, false if the end of the text has been reached.
func (s *scanner) Next() (rune, bool) {
if s.i >= len(s.s) {
return 0, false
}
r := s.s[s.i]
s.i++
return r, true
}
// SkipSpaces returns the next non-whitespace rune.
// It returns 0, false if the end of the text has been reached.
func (s *scanner) SkipSpaces() (rune, bool) {
r, ok := s.Next()
for unicode.IsSpace(r) && ok {
r, ok = s.Next()
}
return r, ok
}
// parseOpts parses the options from name and adds them to the values.
//
// The parsing code is based on conninfo_parse from libpq's fe-connect.c
func parseOpts(name string, o values) error {
s := newScanner(name)
for {
var (
keyRunes, valRunes []rune
r rune
ok bool
)
if r, ok = s.SkipSpaces(); !ok {
break
}
// Scan the key
for !unicode.IsSpace(r) && r != '=' {
keyRunes = append(keyRunes, r)
if r, ok = s.Next(); !ok {
break
}
}
// Skip any whitespace if we're not at the = yet
if r != '=' {
r, ok = s.SkipSpaces()
}
// The current character should be =
if r != '=' || !ok {
return elog.Fatalf(chopPath(funName()), `missing "=" after %q in connection info string"`, string(keyRunes))
}
// Skip any whitespace after the =
if r, ok = s.SkipSpaces(); !ok {
// If we reach the end here, the last value is just an empty string as per libpq.
o[string(keyRunes)] = ""
break
}
if r != '\'' {
for !unicode.IsSpace(r) {
if r == '\\' {
if r, ok = s.Next(); !ok {
return elog.Fatalf(chopPath(funName()), `missing character after backslash`)
}
}
valRunes = append(valRunes, r)
if r, ok = s.Next(); !ok {
break
}
}
} else {
quote:
for {
if r, ok = s.Next(); !ok {
return elog.Fatalf(chopPath(funName()), `unterminated quoted string literal in connection string`)
}
switch r {
case '\'':
break quote
case '\\':
r, _ = s.Next()
fallthrough
default:
valRunes = append(valRunes, r)
}
}
}
o[string(keyRunes)] = string(valRunes)
}
err := elog.Initialize(o["logLevel"], o["logPath"], o["additionalLogFile"])
if err != nil {
return err
}
return nil
}
func (cn *conn) isInTransaction() bool {
return cn.txnStatus == txnStatusIdleInTransaction ||
cn.txnStatus == txnStatusInFailedTransaction
}
func (cn *conn) checkIsInTransaction(intxn bool) error {
if cn.isInTransaction() != intxn {
cn.bad = true
return elog.Fatalf(chopPath(funName()), "unexpected transaction status %v", cn.txnStatus)
}
return nil
}
func (cn *conn) Begin() (_ driver.Tx, err error) {
return cn.begin("")
}
func (cn *conn) begin(mode string) (_ driver.Tx, err error) {
if cn.bad {
return nil, driver.ErrBadConn
}
defer cn.errRecover(&err)
err = cn.checkIsInTransaction(false)
_, commandTag, err := cn.simpleExec("BEGIN")
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return nil, err
}
cn.txnStatus = txnStatusIdleInTransaction
if commandTag != "BEGIN" {
cn.bad = true
return nil, elog.Fatalf(chopPath(funName()), "unexpected command tag %s", commandTag)
}
if cn.txnStatus != txnStatusIdleInTransaction {
cn.bad = true
return nil, elog.Fatalf(chopPath(funName()), "unexpected transaction status %v", cn.txnStatus)
}
return cn, nil
}
func (cn *conn) closeTxn() {
if finish := cn.txnFinish; finish != nil {
finish()
}
}
func (cn *conn) Commit() (err error) {
defer cn.closeTxn()
if cn.bad {
return driver.ErrBadConn
}
defer cn.errRecover(&err)
err = cn.checkIsInTransaction(true)
// We don't want the client to think that everything is okay if it tries
// to commit a failed transaction. However, no matter what we return,
// database/sql will release this connection back into the free connection
// pool so we have to abort the current transaction here. Note that you
// would get the same behaviour if you issued a COMMIT in a failed
// transaction, so it's also the least surprising thing to do here.
if cn.txnStatus == txnStatusInFailedTransaction {
if err := cn.Rollback(); err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return err
}
return ErrInFailedTransaction
}
_, commandTag, err := cn.simpleExec("COMMIT")
if err != nil {
if cn.isInTransaction() {
cn.bad = true
}
elog.Fatalf(chopPath(funName()), err.Error())
return err
}
cn.txnStatus = txnStatusIdle
if commandTag != "COMMIT" {
cn.bad = true
return elog.Fatalf(chopPath(funName()), "unexpected command tag %s", commandTag)
}
err = cn.checkIsInTransaction(false)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return err
}
return nil
}
func (cn *conn) Rollback() (err error) {
defer cn.closeTxn()
if cn.bad {
return driver.ErrBadConn
}
defer cn.errRecover(&err)
err = cn.checkIsInTransaction(true)
_, commandTag, err := cn.simpleExec("ROLLBACK")
if err != nil {
if cn.isInTransaction() {
cn.bad = true
}
elog.Fatalf(chopPath(funName()), err.Error())
return err
}
cn.txnStatus = txnStatusIdle
if commandTag != "ROLLBACK" {
return elog.Fatalf(chopPath(funName()), "unexpected command tag %s", commandTag)
}
err = cn.checkIsInTransaction(false)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return err
}
return nil
}
func (cn *conn) gname() string {
cn.namei++
return strconv.FormatInt(int64(cn.namei), 10)
}
func (cn *conn) simpleExec(query string) (res driver.Result, commandTag string, err error) {
var fname string
var filename readBuf
var fh *os.File
if cn.status == CONN_EXECUTING || cn.status == CONN_FETCHING {
cn.status = CONN_CONNECTED
cn.Sock_clear_socket()
} else if cn.status == CONN_CANCELLED {
// Control will reach here only when the query was really huge and
// even after Cancel request sent, it took too long to cancel and
// Conn_clear_sock returned as data was not yet available
cn.Sock_clear_socket()
}
elog.Infoln("Processing query:", query)
var buffer *writeBuf
if cn.commandNumber != -1 {
cn.commandNumber++
buffer = &writeBuf{
buf: []byte{'P', '\x00', '\x00', '\x00', byte(cn.commandNumber)},
pos: 1,
}
if cn.commandNumber > 100000 {
cn.commandNumber = 1
}
}
buffer.string(query)
elog.Debugln(chopPath(funName()), "Buffer sent to nps: ", buffer.buf)
_, err = cn.c.Write(buffer.buf)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return emptyRows, commandTag, err
}
cn.status = CONN_EXECUTING
for {
var response byte
response, err = cn.recvSingleByte()
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return emptyRows, commandTag, err
}
elog.Debugf(chopPath(funName()), "Backend response %c \n", response)
cn.recv_n_bytes(4)
switch response {
case 'C':
length, _ := cn.recv_n_bytes(4)
responseBuf, _ := cn.recv_n_bytes(int(length.int32()))
res, commandTag, err = cn.parseComplete(responseBuf.string())
case 'Z': /* Backend is ready for new query (6.4) */
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return res, commandTag, err
}
return res, commandTag, nil
case 'E':
length, _ := cn.recv_n_bytes(4)
responseBuf, err := cn.recv_n_bytes(int(length.int32()))
errorString := responseBuf.string()
err = errors.New(errorString)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return res, commandTag, err
}
return res, commandTag, nil
case 'I':
res = emptyRows
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return res, commandTag, err
}
return res, commandTag, nil
case 'N':
length, _ := cn.recv_n_bytes(4)
responseBuf, _ := cn.recv_n_bytes(int(length.int32()))
elog.Infoln(funName(), responseBuf.string())
case 'l':
err := cn.xferTable()
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return nil, commandTag, err
}
break
case 'x': /* handle Ext Tbl parser abort */
cn.recv_n_bytes(4)
errorString := fmt.Sprintf("Error operation cancel")
err = errors.New(errorString)
if err != nil {
elog.Fatalf(chopPath(funName()), err.Error())
return res, commandTag, err
}
return res, commandTag, nil
break
case 'e':
length, _ := cn.recv_n_bytes(4)
logDir, _ := cn.recv_n_bytes(int(length.int32()))
char, _ := cn.recvSingleByte()
for char != 0 {
filename = append(filename, char)
char, _ = cn.recvSingleByte()
}
filename = append(filename, '\x00') /* null terminate it */
logType, _ := cn.recv_n_bytes(4)
if !(cn.getFileFromBE(logDir.string(), filename.string(), logType.int32())) {
elog.Debugln(chopPath(funName()), "Error in writing file received from BE")
}
break
case 'u': /* unload - initialize application protocol */
// in ODBC, the first 10 bytes are utilized to populate clientVersion, formatType and bufSize
// these are not needed in go lang, hence ignoring 10 bytes
cn.recv_n_bytes(10)
/* Next 16 bytes are Reserved Bytes for future extension*/
cn.recv_n_bytes(16)
/* Get the filename (specified in dataobject)*/
fileSpecSize, _ := cn.recv_n_bytes(4)
fname, _ := cn.recv_n_bytes(fileSpecSize.int32())
fname = append(fname, '\x00') /* null terminate it */
fh, err = os.OpenFile(fname.string(), os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
if err != nil { // file open failed
// Report error to the client
elog.Fatalf(chopPath(funName()), err.Error())
return emptyRows, commandTag, err
} else {
// file open successfully, send status back to datawriter
elog.Debugln(chopPath(funName()), "Successfully opened file: ", fh.Name())
buf := []byte{'\x00', '\x00', '\x00', '\x00'}
cn.c.Write(buf)
}