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
119 lines
2.3 KiB
Go
119 lines
2.3 KiB
Go
package pb
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import (
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"fmt"
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"time"
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)
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type Units int
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const (
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// U_NO are default units, they represent a simple value and are not formatted at all.
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U_NO Units = iota
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// U_BYTES units are formatted in a human readable way (B, KiB, MiB, ...)
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U_BYTES
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// U_BYTES_DEC units are like U_BYTES, but base 10 (B, KB, MB, ...)
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U_BYTES_DEC
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// U_DURATION units are formatted in a human readable way (3h14m15s)
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U_DURATION
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)
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const (
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KiB = 1024
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MiB = 1048576
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GiB = 1073741824
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TiB = 1099511627776
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KB = 1e3
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MB = 1e6
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GB = 1e9
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TB = 1e12
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)
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func Format(i int64) *formatter {
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return &formatter{n: i}
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}
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type formatter struct {
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n int64
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unit Units
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width int
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perSec bool
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}
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func (f *formatter) To(unit Units) *formatter {
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f.unit = unit
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return f
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}
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func (f *formatter) Width(width int) *formatter {
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f.width = width
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return f
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}
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func (f *formatter) PerSec() *formatter {
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f.perSec = true
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return f
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}
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func (f *formatter) String() (out string) {
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switch f.unit {
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case U_BYTES:
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out = formatBytes(f.n)
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case U_BYTES_DEC:
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out = formatBytesDec(f.n)
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case U_DURATION:
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out = formatDuration(f.n)
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default:
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out = fmt.Sprintf(fmt.Sprintf("%%%dd", f.width), f.n)
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}
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if f.perSec {
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out += "/s"
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}
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return
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}
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// Convert bytes to human readable string. Like 2 MiB, 64.2 KiB, 52 B
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func formatBytes(i int64) (result string) {
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switch {
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case i >= TiB:
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result = fmt.Sprintf("%.02f TiB", float64(i)/TiB)
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case i >= GiB:
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result = fmt.Sprintf("%.02f GiB", float64(i)/GiB)
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case i >= MiB:
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result = fmt.Sprintf("%.02f MiB", float64(i)/MiB)
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case i >= KiB:
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result = fmt.Sprintf("%.02f KiB", float64(i)/KiB)
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default:
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result = fmt.Sprintf("%d B", i)
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}
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return
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}
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// Convert bytes to base-10 human readable string. Like 2 MB, 64.2 KB, 52 B
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func formatBytesDec(i int64) (result string) {
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switch {
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case i >= TB:
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result = fmt.Sprintf("%.02f TB", float64(i)/TB)
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case i >= GB:
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result = fmt.Sprintf("%.02f GB", float64(i)/GB)
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case i >= MB:
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result = fmt.Sprintf("%.02f MB", float64(i)/MB)
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case i >= KB:
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result = fmt.Sprintf("%.02f KB", float64(i)/KB)
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default:
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result = fmt.Sprintf("%d B", i)
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}
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return
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}
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func formatDuration(n int64) (result string) {
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d := time.Duration(n)
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if d > time.Hour*24 {
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result = fmt.Sprintf("%dd", d/24/time.Hour)
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d -= (d / time.Hour / 24) * (time.Hour * 24)
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}
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result = fmt.Sprintf("%s%v", result, d)
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return
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}
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