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explorer.go
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explorer.go
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// Copyright 2014, 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 etcdtopo
import (
"encoding/json"
"fmt"
"html/template"
"net/http"
"path"
"strings"
"github.com/coreos/go-etcd/etcd"
ctlproto "github.com/youtube/vitess/go/cmd/vtctld/proto"
"github.com/youtube/vitess/go/netutil"
pb "github.com/youtube/vitess/go/vt/proto/topodata"
)
const (
explorerRoot = "/etcd"
globalCell = "global"
)
// Explorer is an implementation of vtctld's Explorer interface for etcd.
type Explorer struct {
ts *Server
}
// NewExplorer implements vtctld Explorer.
func NewExplorer(ts *Server) *Explorer {
return &Explorer{ts: ts}
}
// GetKeyspacePath implements vtctld Explorer.
func (ex Explorer) GetKeyspacePath(keyspace string) string {
return path.Join(explorerRoot, globalCell, keyspaceDirPath(keyspace))
}
// GetShardPath implements vtctld Explorer.
func (ex Explorer) GetShardPath(keyspace, shard string) string {
return path.Join(explorerRoot, globalCell, shardDirPath(keyspace, shard))
}
// GetSrvKeyspacePath implements vtctld Explorer.
func (ex Explorer) GetSrvKeyspacePath(cell, keyspace string) string {
return path.Join(explorerRoot, cell, srvKeyspaceDirPath(keyspace))
}
// GetSrvShardPath implements vtctld Explorer.
func (ex Explorer) GetSrvShardPath(cell, keyspace, shard string) string {
return path.Join(explorerRoot, cell, srvShardDirPath(keyspace, shard))
}
// GetSrvTypePath implements vtctld Explorer.
func (ex Explorer) GetSrvTypePath(cell, keyspace, shard string, tabletType pb.TabletType) string {
return path.Join(explorerRoot, cell, endPointsDirPath(keyspace, shard, tabletType))
}
// GetTabletPath implements vtctld Explorer.
func (ex Explorer) GetTabletPath(alias *pb.TabletAlias) string {
return path.Join(explorerRoot, alias.Cell, tabletDirPath(alias))
}
// GetReplicationSlaves implements vtctld Explorer.
func (ex Explorer) GetReplicationSlaves(cell, keyspace, shard string) string {
return path.Join(explorerRoot, cell, shardReplicationDirPath(keyspace, shard))
}
// HandlePath implements vtctld Explorer.
func (ex Explorer) HandlePath(actionRepo ctlproto.ActionRepository, rPath string, r *http.Request) interface{} {
result := newExplorerResult(rPath)
// Cut off explorerRoot prefix.
if !strings.HasPrefix(rPath, explorerRoot) {
result.Error = "invalid etcd explorer path: " + rPath
return result
}
rPath = rPath[len(explorerRoot):]
// Root is a list of cells.
if rPath == "" {
cells, err := ex.ts.getCellList()
if err != nil {
result.Error = err.Error()
return result
}
result.Children = append([]string{globalCell}, cells...)
return result
}
// Get a client for the requested cell.
var client Client
cell, rPath, err := splitCellPath(rPath)
if err != nil {
result.Error = err.Error()
return result
}
if cell == globalCell {
client = ex.ts.getGlobal()
} else {
client, err = ex.ts.getCell(cell)
if err != nil {
result.Error = "Can't get cell: " + err.Error()
return result
}
}
// Get the requested node data.
resp, err := client.Get(rPath, true /* sort */, false /* recursive */)
if err != nil {
result.Error = err.Error()
return result
}
if resp.Node == nil {
result.Error = ErrBadResponse.Error()
return result
}
result.Data = getNodeData(client, resp.Node)
// Populate children.
for _, node := range resp.Node.Nodes {
result.Children = append(result.Children, path.Base(node.Key))
}
// Populate actions.
if m, _ := path.Match(keyspaceDirPath("*"), rPath); m {
actionRepo.PopulateKeyspaceActions(result.Actions, path.Base(rPath))
} else if m, _ := path.Match(shardDirPath("*", "*"), rPath); m {
if keyspace, shard, err := splitShardDirPath(rPath); err == nil {
actionRepo.PopulateShardActions(result.Actions, keyspace, shard)
}
} else if m, _ := path.Match(path.Join(tabletsDirPath, "*"), rPath); m {
actionRepo.PopulateTabletActions(result.Actions, path.Base(rPath), r)
addTabletLinks(result, result.Data)
}
return result
}
type explorerResult struct {
Path string
Data string
Links map[string]template.URL
Children []string
Actions map[string]template.URL
Error string
}
func newExplorerResult(p string) *explorerResult {
return &explorerResult{
Links: make(map[string]template.URL),
Actions: make(map[string]template.URL),
Path: p,
}
}
func getNodeData(client Client, node *etcd.Node) string {
if !node.Dir {
return node.Value
}
// Directories don't have data, but some directories have a special data file.
resp, err := client.Get(path.Join(node.Key, dataFilename), false /* sort */, false /* recursive */)
if err != nil || resp.Node == nil {
return ""
}
return resp.Node.Value
}
// splitCellPath returns the cell name, and the rest of the path.
// For example: "/cell/rest/of/path" -> "cell", "/rest/of/path"
func splitCellPath(p string) (cell, rest string, err error) {
parts := strings.SplitN(p, "/", 3)
if len(parts) < 2 || parts[0] != "" {
return "", "", fmt.Errorf("invalid etcd explorer path: %v", p)
}
if len(parts) < 3 {
return parts[1], "/", nil
}
return parts[1], "/" + parts[2], nil
}
// splitShardDirPath takes a path that matches the path.Match() pattern
// shardDirPath("*", "*") and returns the keyspace and shard.
//
// We assume the path is of the form "/vt/keyspaces/*/*".
// If that ever changes, the unit test for this function will detect it.
func splitShardDirPath(p string) (keyspace, shard string, err error) {
parts := strings.Split(p, "/")
if len(parts) != 5 {
return "", "", fmt.Errorf("invalid shard dir path: %v", p)
}
return parts[3], parts[4], nil
}
func addTabletLinks(result *explorerResult, data string) {
t := &pb.Tablet{}
err := json.Unmarshal([]byte(data), t)
if err != nil {
return
}
if port, ok := t.PortMap["vt"]; ok {
result.Links["status"] = template.URL(fmt.Sprintf("http://%v/debug/status", netutil.JoinHostPort(t.Hostname, port)))
}
}