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Support dumping from redis clusters (#7)
Signed-off-by: Tamal Saha <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package redisdump | ||
|
|
||
| import ( | ||
| "net" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/mediocregopher/radix/v3" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| func ParseRedisInfo(s string) (map[string]string, error) { | ||
| lines := strings.Split(s, "\n") | ||
|
|
||
| info := map[string]string{} | ||
| for _, line := range lines { | ||
| line = strings.TrimSpace(line) | ||
| if line == "" || strings.HasPrefix(line, "#") { | ||
| continue | ||
| } | ||
| key, val, found := strings.Cut(line, ":") | ||
| if !found { | ||
| continue | ||
| } | ||
| info[key] = val | ||
| } | ||
| return info, nil | ||
| } | ||
|
|
||
| type Node struct { | ||
| Host string | ||
| Port int | ||
| Slots []Range | ||
| } | ||
|
|
||
| type Range struct { | ||
| Start, End int | ||
| } | ||
|
|
||
| func GetMasterNodeAddresses(s string) ([]Node, error) { | ||
| lines := strings.Split(s, "\n") | ||
|
|
||
| var masters []Node | ||
| for _, line := range lines { | ||
| if strings.Contains(line, "master") { | ||
| fields := strings.FieldsFunc(line, func(r rune) bool { | ||
| return r == ' ' || r == '@' | ||
| }) | ||
|
|
||
| host, port, err := net.SplitHostPort(fields[1]) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to split addr %s", fields[1]) | ||
| } | ||
| p, err := strconv.Atoi(port) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to parse port in addr %s", fields[1]) | ||
| } | ||
| m := Node{Host: host, Port: p} | ||
|
|
||
| for i := len(fields) - 1; i >= 0; i-- { | ||
| start, end, found := strings.Cut(fields[i], "-") | ||
| if !found { | ||
| break | ||
| } | ||
| s, err := strconv.Atoi(start) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to parse slot start for redis master %s with slots %s", m.Host, fields[i]) | ||
| } | ||
| e, err := strconv.Atoi(end) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to parse slot end for redis master %s with slots %s", m.Host, fields[i]) | ||
| } | ||
| m.Slots = append(m.Slots, Range{Start: s, End: e}) | ||
| } | ||
| masters = append(masters, m) | ||
| } | ||
| } | ||
| return masters, nil | ||
| } | ||
|
|
||
| func GetHosts(s Host, nWorkers int) ([]Host, error) { | ||
| client, err := NewClient(s, nil, nWorkers) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer client.Close() | ||
|
|
||
| var val string | ||
| err = client.Do(radix.Cmd(&val, "INFO")) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| info, err := ParseRedisInfo(val) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if info["cluster_enabled"] == "0" { | ||
| return []Host{s}, nil | ||
| } | ||
|
|
||
| err = client.Do(radix.Cmd(&val, "CLUSTER", "nodes")) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| masters, err := GetMasterNodeAddresses(val) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| hosts := make([]Host, 0, len(masters)) | ||
| for _, m := range masters { | ||
| scopy := s | ||
| scopy.Host = m.Host | ||
| scopy.Port = m.Port | ||
| hosts = append(hosts, scopy) | ||
| } | ||
| return hosts, nil | ||
| } |
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