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nodetool.go
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nodetool.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package cassandra
import (
"bytes"
"io"
"net"
"os/exec"
"strings"
)
type (
// NodeTool is an interface that Cassandra's
// node tool wrappers must adhere to
NodeTool interface {
// CreateSnapshot captures a cassandra snapshot
CreateSnapshot(name string, keyspace string) error
// ClearSnapshot clears a specific cassandra snapshot
ClearSnapshot(name string) error
// ClearAllSnapshots clears all cassandra snapshots
ClearAllSnapshots() error
// DescKeyspace describes a given keyspace
DescKeyspace(keyspace string) (string, error)
// GetPeers returns the cassandra peers
GetPeers() ([]string, error)
}
// nodeToolImpl is an implementatino
// for NodeTool
nodeToolImpl struct {
serverName string
}
)
const (
cqlshBin = "cqlsh"
nodeToolBin = "nodetool"
)
// NewNodeTool returns a node too wrapper
func NewNodeTool(serverName string) NodeTool {
return &nodeToolImpl{serverName: serverName}
}
// CreateSnapshot captures a cassandra snapshot
func (nt *nodeToolImpl) CreateSnapshot(name string, keyspace string) error {
cmd := exec.Command(nodeToolBin, "snapshot", "-t", name, keyspace)
ans, err := cmd.CombinedOutput()
if err != nil {
return newNodeToolError(string(ans), err)
}
return nil
}
// ClearSnapshot clears a specific cassandra snapshot
func (nt *nodeToolImpl) ClearSnapshot(name string) error {
cmd := exec.Command(nodeToolBin, "clearsnapshot", name)
ans, err := cmd.CombinedOutput()
if err != nil {
return newNodeToolError(string(ans), err)
}
return nil
}
// ClearAllSnapshots clears all cassandra snapshots
func (nt *nodeToolImpl) ClearAllSnapshots() error {
cmd := exec.Command(nodeToolBin, "clearsnapshot")
ans, err := cmd.CombinedOutput()
if err != nil {
return newNodeToolError(string(ans), err)
}
return nil
}
// GetPeers returns the cassandra peers
// This method also adds self to the list
func (nt *nodeToolImpl) GetPeers() ([]string, error) {
cmd := exec.Command(cqlshBin, nt.serverName, "-e", "select peer from system.peers")
stdout, err := cmd.StdoutPipe()
stdoutBuff := new(bytes.Buffer)
if err != nil {
return nil, newNodeToolError("cqlsh exec failed", err)
}
if err = cmd.Start(); err != nil {
return nil, newNodeToolError("cqlsh exec failed", err)
}
io.Copy(stdoutBuff, stdout)
if err = cmd.Wait(); err != nil {
return nil, newNodeToolError("cqlsh exec failed", err)
}
result := make([]string, 0, 4)
cmd = exec.Command("grep", "-E", ipAddrRegexStr)
cmd.Stdin = stdoutBuff
ans, err := cmd.CombinedOutput()
if err == nil {
result = addrsToNames(string(ans), result)
}
if ipAddrRegex.MatchString(nt.serverName) {
myName, err1 := net.LookupAddr(nt.serverName)
if err1 == nil {
result = append(result, myName[0])
}
} else {
result = append(result, nt.serverName)
}
return result, nil
}
// DescKeyspace describes a given keyspace
func (nt *nodeToolImpl) DescKeyspace(keyspace string) (string, error) {
cmd := exec.Command(cqlshBin, nt.serverName, "-e", "DESC "+keyspace)
ans, err := cmd.CombinedOutput()
if err != nil {
return "", newNodeToolError("cqlsh exec failed", err)
}
return string(ans), nil
}
func addrsToNames(addrs string, result []string) []string {
for _, addr := range strings.Split(addrs, "\n") {
trimmed := strings.TrimSpace(addr)
if len(trimmed) < 1 {
continue
}
names, e := net.LookupAddr(trimmed)
if e != nil || len(names) < 1 {
// if we cannot resolve, just use the addr
result = append(result, trimmed)
}
result = append(result, names[0])
}
return result
}