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split_diff_cmd.go
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split_diff_cmd.go
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// Copyright 2013, 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 worker
import (
"flag"
"fmt"
"html/template"
"net/http"
"strings"
"sync"
"github.com/youtube/vitess/go/vt/concurrency"
"github.com/youtube/vitess/go/vt/topo/topoproto"
"github.com/youtube/vitess/go/vt/wrangler"
"golang.org/x/net/context"
)
const splitDiffHTML = `
<!DOCTYPE html>
<head>
<title>Split Diff Action</title>
</head>
<body>
<h1>Split Diff Action</h1>
{{if .Error}}
<b>Error:</b> {{.Error}}</br>
{{else}}
{{range $i, $si := .Shards}}
<li><a href="/Diffs/SplitDiff?keyspace={{$si.Keyspace}}&shard={{$si.Shard}}">{{$si.Keyspace}}/{{$si.Shard}}</a></li>
{{end}}
{{end}}
</body>
`
const splitDiffHTML2 = `
<!DOCTYPE html>
<head>
<title>Split Diff Action</title>
</head>
<body>
<p>Shard involved: {{.Keyspace}}/{{.Shard}}</p>
<h1>Split Diff Action</h1>
<form action="/Diffs/SplitDiff" method="post">
<LABEL for="excludeTables">Exclude Tables: </LABEL>
<INPUT type="text" id="excludeTables" name="excludeTables" value=""></BR>
<INPUT type="hidden" name="keyspace" value="{{.Keyspace}}"/>
<INPUT type="hidden" name="shard" value="{{.Shard}}"/>
<INPUT type="submit" name="submit" value="Split Diff"/>
</form>
</body>
`
var splitDiffTemplate = mustParseTemplate("splitDiff", splitDiffHTML)
var splitDiffTemplate2 = mustParseTemplate("splitDiff2", splitDiffHTML2)
func commandSplitDiff(wi *Instance, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) (Worker, error) {
excludeTables := subFlags.String("exclude_tables", "", "comma separated list of tables to exclude")
if err := subFlags.Parse(args); err != nil {
return nil, err
}
if subFlags.NArg() != 1 {
subFlags.Usage()
return nil, fmt.Errorf("command SplitDiff requires <keyspace/shard>")
}
keyspace, shard, err := topoproto.ParseKeyspaceShard(subFlags.Arg(0))
if err != nil {
return nil, err
}
var excludeTableArray []string
if *excludeTables != "" {
excludeTableArray = strings.Split(*excludeTables, ",")
}
return NewSplitDiffWorker(wr, wi.cell, keyspace, shard, excludeTableArray), nil
}
// shardsWithSources returns all the shards that have SourceShards set
// with no Tables list.
func shardsWithSources(ctx context.Context, wr *wrangler.Wrangler) ([]map[string]string, error) {
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
keyspaces, err := wr.TopoServer().GetKeyspaces(shortCtx)
cancel()
if err != nil {
return nil, fmt.Errorf("failed to get list of keyspaces: %v", err)
}
wg := sync.WaitGroup{}
mu := sync.Mutex{} // protects result
result := make([]map[string]string, 0, len(keyspaces))
rec := concurrency.AllErrorRecorder{}
for _, keyspace := range keyspaces {
wg.Add(1)
go func(keyspace string) {
defer wg.Done()
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
shards, err := wr.TopoServer().GetShardNames(shortCtx, keyspace)
cancel()
if err != nil {
rec.RecordError(fmt.Errorf("failed to get list of shards for keyspace '%v': %v", keyspace, err))
return
}
for _, shard := range shards {
wg.Add(1)
go func(keyspace, shard string) {
defer wg.Done()
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
si, err := wr.TopoServer().GetShard(shortCtx, keyspace, shard)
cancel()
if err != nil {
rec.RecordError(fmt.Errorf("failed to get details for shard '%v': %v", topoproto.KeyspaceShardString(keyspace, shard), err))
return
}
if len(si.SourceShards) > 0 && len(si.SourceShards[0].Tables) == 0 {
mu.Lock()
result = append(result, map[string]string{
"Keyspace": keyspace,
"Shard": shard,
})
mu.Unlock()
}
}(keyspace, shard)
}
}(keyspace)
}
wg.Wait()
if rec.HasErrors() {
return nil, rec.Error()
}
if len(result) == 0 {
return nil, fmt.Errorf("there are no shards with SourceShards")
}
return result, nil
}
func interactiveSplitDiff(ctx context.Context, wi *Instance, wr *wrangler.Wrangler, w http.ResponseWriter, r *http.Request) (Worker, *template.Template, map[string]interface{}, error) {
if err := r.ParseForm(); err != nil {
return nil, nil, nil, fmt.Errorf("cannot parse form: %s", err)
}
keyspace := r.FormValue("keyspace")
shard := r.FormValue("shard")
if keyspace == "" || shard == "" {
// display the list of possible shards to chose from
result := make(map[string]interface{})
shards, err := shardsWithSources(ctx, wr)
if err != nil {
result["Error"] = err.Error()
} else {
result["Shards"] = shards
}
return nil, splitDiffTemplate, result, nil
}
submitButtonValue := r.FormValue("submit")
if submitButtonValue == "" {
// display the input form
result := make(map[string]interface{})
result["Keyspace"] = keyspace
result["Shard"] = shard
return nil, splitDiffTemplate2, result, nil
}
// Process input form.
excludeTables := r.FormValue("excludeTables")
var excludeTableArray []string
if excludeTables != "" {
excludeTableArray = strings.Split(excludeTables, ",")
}
// start the diff job
wrk := NewSplitDiffWorker(wr, wi.cell, keyspace, shard, excludeTableArray)
return wrk, nil, nil, nil
}
func init() {
AddCommand("Diffs", Command{"SplitDiff",
commandSplitDiff, interactiveSplitDiff,
"[--exclude_tables=''] <keyspace/shard>",
"Diffs a rdonly destination shard against its SourceShards"})
}