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|
// +build ccm
package ccm
import (
"bufio"
"bytes"
"errors"
"fmt"
"os/exec"
"strings"
)
func execCmd(args ...string) (*bytes.Buffer, error) {
cmd := exec.Command("ccm", args...)
stdout := &bytes.Buffer{}
cmd.Stdout = stdout
cmd.Stderr = &bytes.Buffer{}
if err := cmd.Run(); err != nil {
return nil, errors.New(cmd.Stderr.(*bytes.Buffer).String())
}
return stdout, nil
}
func AllUp() error {
status, err := Status()
if err != nil {
return err
}
for _, host := range status {
if !host.State.IsUp() {
if err := NodeUp(host.Name); err != nil {
return err
}
}
}
return nil
}
func NodeUp(node string) error {
_, err := execCmd(node, "start", "--wait-for-binary-proto", "--wait-other-notice")
return err
}
func NodeDown(node string) error {
_, err := execCmd(node, "stop")
return err
}
type Host struct {
State NodeState
Addr string
Name string
}
type NodeState int
func (n NodeState) String() string {
if n == NodeStateUp {
return "UP"
} else if n == NodeStateDown {
return "DOWN"
} else {
return fmt.Sprintf("UNKNOWN_STATE_%d", n)
}
}
func (n NodeState) IsUp() bool {
return n == NodeStateUp
}
const (
NodeStateUp NodeState = iota
NodeStateDown
)
func Status() (map[string]Host, error) {
// TODO: parse into struct to manipulate
out, err := execCmd("status", "-v")
if err != nil {
return nil, err
}
const (
stateCluster = iota
stateCommas
stateNode
stateOption
)
nodes := make(map[string]Host)
// didnt really want to write a full state machine parser
state := stateCluster
sc := bufio.NewScanner(out)
var host Host
for sc.Scan() {
switch state {
case stateCluster:
text := sc.Text()
if !strings.HasPrefix(text, "Cluster:") {
return nil, fmt.Errorf("expected 'Cluster:' got %q", text)
}
state = stateCommas
case stateCommas:
text := sc.Text()
if !strings.HasPrefix(text, "-") {
return nil, fmt.Errorf("expected commas got %q", text)
}
state = stateNode
case stateNode:
// assume nodes start with node
text := sc.Text()
if !strings.HasPrefix(text, "node") {
return nil, fmt.Errorf("expected 'node' got %q", text)
}
line := strings.Split(text, ":")
host.Name = line[0]
nodeState := strings.TrimSpace(line[1])
switch nodeState {
case "UP":
host.State = NodeStateUp
case "DOWN":
host.State = NodeStateDown
default:
return nil, fmt.Errorf("unknown node state from ccm: %q", nodeState)
}
state = stateOption
case stateOption:
text := sc.Text()
if text == "" {
state = stateNode
nodes[host.Name] = host
host = Host{}
continue
}
line := strings.Split(strings.TrimSpace(text), "=")
k, v := line[0], line[1]
if k == "binary" {
// could check errors
// ('127.0.0.1', 9042)
v = v[2:] // (''
if i := strings.IndexByte(v, '\''); i < 0 {
return nil, fmt.Errorf("invalid binary v=%q", v)
} else {
host.Addr = v[:i]
// dont need port
}
}
default:
return nil, fmt.Errorf("unexpected state: %q", state)
}
}
if err := sc.Err(); err != nil {
return nil, fmt.Errorf("unable to parse ccm status: %v", err)
}
return nodes, nil
}
|
