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query.go
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query.go
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// Copyright 2015, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package vtctl
import (
"encoding/hex"
"encoding/json"
"flag"
"fmt"
"io"
"strconv"
"strings"
"time"
"github.com/olekukonko/tablewriter"
"github.com/youtube/vitess/go/sqltypes"
"github.com/youtube/vitess/go/vt/logutil"
"github.com/youtube/vitess/go/vt/servenv"
"github.com/youtube/vitess/go/vt/tabletserver/tabletconn"
"github.com/youtube/vitess/go/vt/topo/topoproto"
"github.com/youtube/vitess/go/vt/vtgate/vtgateconn"
"github.com/youtube/vitess/go/vt/wrangler"
"golang.org/x/net/context"
topodatapb "github.com/youtube/vitess/go/vt/proto/topodata"
)
// This file contains the query command group for vtctl.
const queriesGroupName = "Queries"
var (
enableQueries = flag.Bool("enable_queries", false, "if set, allows vtgate and vttablet queries. May have security implications, as the queries will be run from this process.")
)
func init() {
servenv.OnRun(func() {
if !*enableQueries {
return
}
addCommandGroup(queriesGroupName)
// VtGate commands
addCommand(queriesGroupName, command{
"VtGateExecute",
commandVtGateExecute,
"-server <vtgate> [-bind_variables <JSON map>] [-connect_timeout <connect timeout>] [-keyspace <default keyspace>] [-tablet_type <tablet type>] [-json] <sql>",
"Executes the given SQL query with the provided bound variables against the vtgate server."})
addCommand(queriesGroupName, command{
"VtGateExecuteShards",
commandVtGateExecuteShards,
"-server <vtgate> -keyspace <keyspace> -shards <shard0>,<shard1>,... [-bind_variables <JSON map>] [-connect_timeout <connect timeout>] [-tablet_type <tablet type>] [-json] <sql>",
"Executes the given SQL query with the provided bound variables against the vtgate server. It is routed to the provided shards."})
addCommand(queriesGroupName, command{
"VtGateExecuteKeyspaceIds",
commandVtGateExecuteKeyspaceIds,
"-server <vtgate> -keyspace <keyspace> -keyspace_ids <ks1 in hex>,<k2 in hex>,... [-bind_variables <JSON map>] [-connect_timeout <connect timeout>] [-tablet_type <tablet type>] [-json] <sql>",
"Executes the given SQL query with the provided bound variables against the vtgate server. It is routed to the shards that contain the provided keyspace ids."})
addCommand(queriesGroupName, command{
"VtGateSplitQuery",
commandVtGateSplitQuery,
"-server <vtgate> -keyspace <keyspace> [-split_column <split_column>] -split_count <split_count> [-bind_variables <JSON map>] [-connect_timeout <connect timeout>] <sql>",
"Executes the SplitQuery computation for the given SQL query with the provided bound variables against the vtgate server (this is the base query for Map-Reduce workloads, and is provided here for debug / test purposes)."})
// VtTablet commands
addCommand(queriesGroupName, command{
"VtTabletExecute",
commandVtTabletExecute,
"[-bind_variables <JSON map>] [-connect_timeout <connect timeout>] [-transaction_id <transaction_id>] [-tablet_type <tablet_type>] [-json] -keyspace <keyspace> -shard <shard> <tablet alias> <sql>",
"Executes the given query on the given tablet."})
addCommand(queriesGroupName, command{
"VtTabletBegin",
commandVtTabletBegin,
"[-connect_timeout <connect timeout>] [-tablet_type <tablet_type>] -keyspace <keyspace> -shard <shard> <tablet alias>",
"Starts a transaction on the provided server."})
addCommand(queriesGroupName, command{
"VtTabletCommit",
commandVtTabletCommit,
"[-connect_timeout <connect timeout>] [-tablet_type <tablet_type>] -keyspace <keyspace> -shard <shard> <tablet alias> <transaction_id>",
"Commits a transaction on the provided server."})
addCommand(queriesGroupName, command{
"VtTabletRollback",
commandVtTabletRollback,
"[-connect_timeout <connect timeout>] [-tablet_type <tablet_type>] -keyspace <keyspace> -shard <shard> <tablet alias> <transaction_id>",
"Rollbacks a transaction on the provided server."})
addCommand(queriesGroupName, command{
"VtTabletStreamHealth",
commandVtTabletStreamHealth,
"[-count <count, default 1>] [-connect_timeout <connect timeout>] <tablet alias>",
"Executes the StreamHealth streaming query to a vttablet process. Will stop after getting <count> answers."})
})
}
type bindvars map[string]interface{}
func (bv *bindvars) String() string {
b, err := json.Marshal(bv)
if err != nil {
return err.Error()
}
return string(b)
}
func (bv *bindvars) Set(s string) (err error) {
err = json.Unmarshal([]byte(s), &bv)
if err != nil {
return fmt.Errorf("error json-unmarshaling '%v': %v", s, err)
}
// json reads all numbers as float64
// So, we just ditch floats for bindvars
for k, v := range *bv {
if f, ok := v.(float64); ok {
if f > 0 {
(*bv)[k] = uint64(f)
} else {
(*bv)[k] = int64(f)
}
}
}
return nil
}
// For internal flag compatibility
func (bv *bindvars) Get() interface{} {
return bv
}
func newBindvars(subFlags *flag.FlagSet) *bindvars {
var bv bindvars
subFlags.Var(&bv, "bind_variables", "bind variables as a json list")
return &bv
}
func commandVtGateExecute(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
server := subFlags.String("server", "", "VtGate server to connect to")
bindVariables := newBindvars(subFlags)
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
keyspace := subFlags.String("keyspace", "", "default keyspace to use")
tabletType := subFlags.String("tablet_type", "master", "tablet type to query")
json := subFlags.Bool("json", false, "Output JSON instead of human-readable table")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("the <sql> argument is required for the VtGateExecute command")
}
t, err := parseTabletType(*tabletType, []topodatapb.TabletType{topodatapb.TabletType_MASTER, topodatapb.TabletType_REPLICA, topodatapb.TabletType_RDONLY})
if err != nil {
return err
}
vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout, *keyspace)
if err != nil {
return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
}
defer vtgateConn.Close()
qr, err := vtgateConn.Execute(ctx, subFlags.Arg(0), *bindVariables, t)
if err != nil {
return fmt.Errorf("Execute failed: %v", err)
}
if *json {
return printJSON(wr.Logger(), qr)
}
printQueryResult(loggerWriter{wr.Logger()}, qr)
return nil
}
func commandVtGateExecuteShards(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
server := subFlags.String("server", "", "VtGate server to connect to")
bindVariables := newBindvars(subFlags)
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
tabletType := subFlags.String("tablet_type", "master", "tablet type to query")
keyspace := subFlags.String("keyspace", "", "keyspace to send query to")
shardsStr := subFlags.String("shards", "", "comma-separated list of shards to send query to")
json := subFlags.Bool("json", false, "Output JSON instead of human-readable table")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("the <sql> argument is required for the VtGateExecuteShards command")
}
t, err := parseTabletType(*tabletType, []topodatapb.TabletType{topodatapb.TabletType_MASTER, topodatapb.TabletType_REPLICA, topodatapb.TabletType_RDONLY})
if err != nil {
return err
}
var shards []string
if *shardsStr != "" {
shards = strings.Split(*shardsStr, ",")
}
vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout, "")
if err != nil {
return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
}
defer vtgateConn.Close()
qr, err := vtgateConn.ExecuteShards(ctx, subFlags.Arg(0), *keyspace, shards, *bindVariables, t)
if err != nil {
return fmt.Errorf("Execute failed: %v", err)
}
if *json {
return printJSON(wr.Logger(), qr)
}
printQueryResult(loggerWriter{wr.Logger()}, qr)
return nil
}
func commandVtGateExecuteKeyspaceIds(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
server := subFlags.String("server", "", "VtGate server to connect to")
bindVariables := newBindvars(subFlags)
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
tabletType := subFlags.String("tablet_type", "master", "tablet type to query")
keyspace := subFlags.String("keyspace", "", "keyspace to send query to")
keyspaceIDsStr := subFlags.String("keyspace_ids", "", "comma-separated list of keyspace ids (in hex) that will map into shards to send query to")
json := subFlags.Bool("json", false, "Output JSON instead of human-readable table")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("the <sql> argument is required for the VtGateExecuteKeyspaceIds command")
}
t, err := parseTabletType(*tabletType, []topodatapb.TabletType{topodatapb.TabletType_MASTER, topodatapb.TabletType_REPLICA, topodatapb.TabletType_RDONLY})
if err != nil {
return err
}
var keyspaceIDs [][]byte
if *keyspaceIDsStr != "" {
keyspaceIDHexs := strings.Split(*keyspaceIDsStr, ",")
keyspaceIDs = make([][]byte, len(keyspaceIDHexs))
for i, keyspaceIDHex := range keyspaceIDHexs {
keyspaceIDs[i], err = hex.DecodeString(keyspaceIDHex)
if err != nil {
return fmt.Errorf("cannot hex-decode value %v '%v': %v", i, keyspaceIDHex, err)
}
}
}
vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout, "")
if err != nil {
return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
}
defer vtgateConn.Close()
qr, err := vtgateConn.ExecuteKeyspaceIds(ctx, subFlags.Arg(0), *keyspace, keyspaceIDs, *bindVariables, t)
if err != nil {
return fmt.Errorf("Execute failed: %v", err)
}
if *json {
return printJSON(wr.Logger(), qr)
}
printQueryResult(loggerWriter{wr.Logger()}, qr)
return nil
}
func commandVtGateSplitQuery(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
server := subFlags.String("server", "", "VtGate server to connect to")
bindVariables := newBindvars(subFlags)
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
splitColumn := subFlags.String("split_column", "", "force the use of this column to split the query")
splitCount := subFlags.Int("split_count", 16, "number of splits to generate")
keyspace := subFlags.String("keyspace", "", "keyspace to send query to")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("the <sql> argument is required for the VtGateSplitQuery command")
}
vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout, "")
if err != nil {
return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
}
defer vtgateConn.Close()
r, err := vtgateConn.SplitQuery(ctx, *keyspace, subFlags.Arg(0), *bindVariables, *splitColumn, int64(*splitCount))
if err != nil {
return fmt.Errorf("SplitQuery failed: %v", err)
}
return printJSON(wr.Logger(), r)
}
func commandVtTabletExecute(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
transactionID := subFlags.Int("transaction_id", 0, "transaction id to use, if inside a transaction.")
bindVariables := newBindvars(subFlags)
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vttablet client")
json := subFlags.Bool("json", false, "Output JSON instead of human-readable table")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 2 {
return fmt.Errorf("the <tablet_alias> and <sql> arguments are required for the VtTabletExecute command")
}
tabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
conn, err := tabletconn.GetDialer()(ctx, tabletInfo.Tablet, *connectTimeout)
if err != nil {
return fmt.Errorf("cannot connect to tablet %v: %v", tabletAlias, err)
}
defer conn.Close()
qr, err := conn.Execute(ctx, subFlags.Arg(1), *bindVariables, int64(*transactionID))
if err != nil {
return fmt.Errorf("Execute failed: %v", err)
}
if *json {
return printJSON(wr.Logger(), qr)
}
printQueryResult(loggerWriter{wr.Logger()}, qr)
return nil
}
func commandVtTabletBegin(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vttablet client")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("the <tablet_alias> argument is required for the VtTabletBegin command")
}
tabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
conn, err := tabletconn.GetDialer()(ctx, tabletInfo.Tablet, *connectTimeout)
if err != nil {
return fmt.Errorf("cannot connect to tablet %v: %v", tabletAlias, err)
}
defer conn.Close()
transactionID, err := conn.Begin(ctx)
if err != nil {
return fmt.Errorf("Begin failed: %v", err)
}
result := map[string]int64{
"transaction_id": transactionID,
}
return printJSON(wr.Logger(), result)
}
func commandVtTabletCommit(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vttablet client")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 2 {
return fmt.Errorf("the <tablet_alias> and <transaction_id> arguments are required for the VtTabletCommit command")
}
transactionID, err := strconv.ParseInt(subFlags.Arg(1), 10, 64)
if err != nil {
return err
}
tabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
conn, err := tabletconn.GetDialer()(ctx, tabletInfo.Tablet, *connectTimeout)
if err != nil {
return fmt.Errorf("cannot connect to tablet %v: %v", tabletAlias, err)
}
defer conn.Close()
return conn.Commit(ctx, transactionID)
}
func commandVtTabletRollback(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vttablet client")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 2 {
return fmt.Errorf("the <tablet_alias> and <transaction_id> arguments are required for the VtTabletRollback command")
}
transactionID, err := strconv.ParseInt(subFlags.Arg(1), 10, 64)
if err != nil {
return err
}
tabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
conn, err := tabletconn.GetDialer()(ctx, tabletInfo.Tablet, *connectTimeout)
if err != nil {
return fmt.Errorf("cannot connect to tablet %v: %v", tabletAlias, err)
}
defer conn.Close()
return conn.Rollback(ctx, transactionID)
}
func commandVtTabletStreamHealth(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
count := subFlags.Int("count", 1, "number of responses to wait for")
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vttablet client")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("The <tablet alias> argument is required for the VtTabletStreamHealth command.")
}
tabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
conn, err := tabletconn.GetDialer()(ctx, tabletInfo.Tablet, *connectTimeout)
if err != nil {
return fmt.Errorf("cannot connect to tablet %v: %v", tabletAlias, err)
}
stream, err := conn.StreamHealth(ctx)
if err != nil {
return err
}
for i := 0; i < *count; i++ {
shr, err := stream.Recv()
if err != nil {
return fmt.Errorf("stream ended early: %v", err)
}
data, err := json.Marshal(shr)
if err != nil {
wr.Logger().Errorf("cannot json-marshal structure: %v", err)
} else {
wr.Logger().Printf("%v\n", string(data))
}
}
return nil
}
// loggerWriter turns a Logger into a Writer by decorating it with a Write()
// method that sends everything to Logger.Printf().
type loggerWriter struct {
logutil.Logger
}
func (lw loggerWriter) Write(p []byte) (int, error) {
lw.Logger.Printf("%s", p)
return len(p), nil
}
// printQueryResult will pretty-print a QueryResult to the logger.
func printQueryResult(writer io.Writer, qr *sqltypes.Result) {
table := tablewriter.NewWriter(writer)
table.SetAutoFormatHeaders(false)
// Make header.
header := make([]string, 0, len(qr.Fields))
for _, field := range qr.Fields {
header = append(header, field.Name)
}
table.SetHeader(header)
// Add rows.
for _, row := range qr.Rows {
vals := make([]string, 0, len(row))
for _, val := range row {
vals = append(vals, val.String())
}
table.Append(vals)
}
// Print table.
table.Render()
}