mirror of
https://github.com/octoleo/syncthing.git
synced 2024-12-23 19:39:05 +00:00
916ec63af6
This is a new revision of the discovery server. Relevant changes and non-changes: - Protocol towards clients is unchanged. - Recommended large scale design is still to be deployed nehind nginx (I tested, and it's still a lot faster at terminating TLS). - Database backend is leveldb again, only. It scales enough, is easy to setup, and we don't need any backend to take care of. - Server supports replication. This is a simple TCP channel - protect it with a firewall when deploying over the internet. (We deploy this within the same datacenter, and with firewall.) Any incoming client announces are sent over the replication channel(s) to other peer discosrvs. Incoming replication changes are applied to the database as if they came from clients, but without the TLS/certificate overhead. - Metrics are exposed using the prometheus library, when enabled. - The database values and replication protocol is protobuf, because JSON was quite CPU intensive when I tried that and benchmarked it. - The "Retry-After" value for failed lookups gets slowly increased from a default of 120 seconds, by 5 seconds for each failed lookup, independently by each discosrv. This lowers the query load over time for clients that are never seen. The Retry-After maxes out at 3600 after a couple of weeks of this increase. The number of failed lookups is stored in the database, now and then (avoiding making each lookup a database put). All in all this means clients can be pointed towards a cluster using just multiple A / AAAA records to gain both load sharing and redundancy (if one is down, clients will talk to the remaining ones). GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4648
139 lines
3.5 KiB
Go
139 lines
3.5 KiB
Go
package procfs
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
statuslineRE = regexp.MustCompile(`(\d+) blocks .*\[(\d+)/(\d+)\] \[[U_]+\]`)
|
|
buildlineRE = regexp.MustCompile(`\((\d+)/\d+\)`)
|
|
)
|
|
|
|
// MDStat holds info parsed from /proc/mdstat.
|
|
type MDStat struct {
|
|
// Name of the device.
|
|
Name string
|
|
// activity-state of the device.
|
|
ActivityState string
|
|
// Number of active disks.
|
|
DisksActive int64
|
|
// Total number of disks the device consists of.
|
|
DisksTotal int64
|
|
// Number of blocks the device holds.
|
|
BlocksTotal int64
|
|
// Number of blocks on the device that are in sync.
|
|
BlocksSynced int64
|
|
}
|
|
|
|
// ParseMDStat parses an mdstat-file and returns a struct with the relevant infos.
|
|
func (fs FS) ParseMDStat() (mdstates []MDStat, err error) {
|
|
mdStatusFilePath := fs.Path("mdstat")
|
|
content, err := ioutil.ReadFile(mdStatusFilePath)
|
|
if err != nil {
|
|
return []MDStat{}, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
|
|
}
|
|
|
|
mdStates := []MDStat{}
|
|
lines := strings.Split(string(content), "\n")
|
|
for i, l := range lines {
|
|
if l == "" {
|
|
continue
|
|
}
|
|
if l[0] == ' ' {
|
|
continue
|
|
}
|
|
if strings.HasPrefix(l, "Personalities") || strings.HasPrefix(l, "unused") {
|
|
continue
|
|
}
|
|
|
|
mainLine := strings.Split(l, " ")
|
|
if len(mainLine) < 3 {
|
|
return mdStates, fmt.Errorf("error parsing mdline: %s", l)
|
|
}
|
|
mdName := mainLine[0]
|
|
activityState := mainLine[2]
|
|
|
|
if len(lines) <= i+3 {
|
|
return mdStates, fmt.Errorf(
|
|
"error parsing %s: too few lines for md device %s",
|
|
mdStatusFilePath,
|
|
mdName,
|
|
)
|
|
}
|
|
|
|
active, total, size, err := evalStatusline(lines[i+1])
|
|
if err != nil {
|
|
return mdStates, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
|
|
}
|
|
|
|
// j is the line number of the syncing-line.
|
|
j := i + 2
|
|
if strings.Contains(lines[i+2], "bitmap") { // skip bitmap line
|
|
j = i + 3
|
|
}
|
|
|
|
// If device is syncing at the moment, get the number of currently
|
|
// synced bytes, otherwise that number equals the size of the device.
|
|
syncedBlocks := size
|
|
if strings.Contains(lines[j], "recovery") || strings.Contains(lines[j], "resync") {
|
|
syncedBlocks, err = evalBuildline(lines[j])
|
|
if err != nil {
|
|
return mdStates, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
|
|
}
|
|
}
|
|
|
|
mdStates = append(mdStates, MDStat{
|
|
Name: mdName,
|
|
ActivityState: activityState,
|
|
DisksActive: active,
|
|
DisksTotal: total,
|
|
BlocksTotal: size,
|
|
BlocksSynced: syncedBlocks,
|
|
})
|
|
}
|
|
|
|
return mdStates, nil
|
|
}
|
|
|
|
func evalStatusline(statusline string) (active, total, size int64, err error) {
|
|
matches := statuslineRE.FindStringSubmatch(statusline)
|
|
if len(matches) != 4 {
|
|
return 0, 0, 0, fmt.Errorf("unexpected statusline: %s", statusline)
|
|
}
|
|
|
|
size, err = strconv.ParseInt(matches[1], 10, 64)
|
|
if err != nil {
|
|
return 0, 0, 0, fmt.Errorf("unexpected statusline %s: %s", statusline, err)
|
|
}
|
|
|
|
total, err = strconv.ParseInt(matches[2], 10, 64)
|
|
if err != nil {
|
|
return 0, 0, 0, fmt.Errorf("unexpected statusline %s: %s", statusline, err)
|
|
}
|
|
|
|
active, err = strconv.ParseInt(matches[3], 10, 64)
|
|
if err != nil {
|
|
return 0, 0, 0, fmt.Errorf("unexpected statusline %s: %s", statusline, err)
|
|
}
|
|
|
|
return active, total, size, nil
|
|
}
|
|
|
|
func evalBuildline(buildline string) (syncedBlocks int64, err error) {
|
|
matches := buildlineRE.FindStringSubmatch(buildline)
|
|
if len(matches) != 2 {
|
|
return 0, fmt.Errorf("unexpected buildline: %s", buildline)
|
|
}
|
|
|
|
syncedBlocks, err = strconv.ParseInt(matches[1], 10, 64)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("%s in buildline: %s", err, buildline)
|
|
}
|
|
|
|
return syncedBlocks, nil
|
|
}
|