cmd/stdiscosrv: New discovery server (fixes #4618)
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
This commit is contained in:
Jakob Borg
359
vendor/github.com/prometheus/procfs/xfs/parse.go
generated
vendored
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359
vendor/github.com/prometheus/procfs/xfs/parse.go
generated
vendored
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@@ -0,0 +1,359 @@
|
||||
// Copyright 2017 The Prometheus Authors
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package xfs
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"fmt"
|
||||
"io"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// ParseStats parses a Stats from an input io.Reader, using the format
|
||||
// found in /proc/fs/xfs/stat.
|
||||
func ParseStats(r io.Reader) (*Stats, error) {
|
||||
const (
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// Fields parsed into stats structures.
|
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fieldExtentAlloc = "extent_alloc"
|
||||
fieldAbt = "abt"
|
||||
fieldBlkMap = "blk_map"
|
||||
fieldBmbt = "bmbt"
|
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fieldDir = "dir"
|
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fieldTrans = "trans"
|
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fieldIg = "ig"
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fieldLog = "log"
|
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fieldRw = "rw"
|
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fieldAttr = "attr"
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fieldIcluster = "icluster"
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fieldVnodes = "vnodes"
|
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fieldBuf = "buf"
|
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fieldXpc = "xpc"
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|
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// Unimplemented at this time due to lack of documentation.
|
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fieldPushAil = "push_ail"
|
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fieldXstrat = "xstrat"
|
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fieldAbtb2 = "abtb2"
|
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fieldAbtc2 = "abtc2"
|
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fieldBmbt2 = "bmbt2"
|
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fieldIbt2 = "ibt2"
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fieldFibt2 = "fibt2"
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fieldQm = "qm"
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fieldDebug = "debug"
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)
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var xfss Stats
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s := bufio.NewScanner(r)
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for s.Scan() {
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// Expect at least a string label and a single integer value, ex:
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// - abt 0
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// - rw 1 2
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ss := strings.Fields(string(s.Bytes()))
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if len(ss) < 2 {
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continue
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}
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label := ss[0]
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// Extended precision counters are uint64 values.
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if label == fieldXpc {
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us, err := parseUint64s(ss[1:])
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if err != nil {
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return nil, err
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}
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xfss.ExtendedPrecision, err = extendedPrecisionStats(us)
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if err != nil {
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return nil, err
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}
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continue
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}
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// All other counters are uint32 values.
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us, err := parseUint32s(ss[1:])
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if err != nil {
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return nil, err
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}
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switch label {
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case fieldExtentAlloc:
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xfss.ExtentAllocation, err = extentAllocationStats(us)
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case fieldAbt:
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xfss.AllocationBTree, err = btreeStats(us)
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case fieldBlkMap:
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xfss.BlockMapping, err = blockMappingStats(us)
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case fieldBmbt:
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xfss.BlockMapBTree, err = btreeStats(us)
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case fieldDir:
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xfss.DirectoryOperation, err = directoryOperationStats(us)
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case fieldTrans:
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xfss.Transaction, err = transactionStats(us)
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case fieldIg:
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xfss.InodeOperation, err = inodeOperationStats(us)
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case fieldLog:
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xfss.LogOperation, err = logOperationStats(us)
|
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case fieldRw:
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xfss.ReadWrite, err = readWriteStats(us)
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case fieldAttr:
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xfss.AttributeOperation, err = attributeOperationStats(us)
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case fieldIcluster:
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xfss.InodeClustering, err = inodeClusteringStats(us)
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case fieldVnodes:
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xfss.Vnode, err = vnodeStats(us)
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case fieldBuf:
|
||||
xfss.Buffer, err = bufferStats(us)
|
||||
}
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
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}
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||||
|
||||
return &xfss, s.Err()
|
||||
}
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||||
|
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// extentAllocationStats builds an ExtentAllocationStats from a slice of uint32s.
|
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func extentAllocationStats(us []uint32) (ExtentAllocationStats, error) {
|
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if l := len(us); l != 4 {
|
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return ExtentAllocationStats{}, fmt.Errorf("incorrect number of values for XFS extent allocation stats: %d", l)
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}
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return ExtentAllocationStats{
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ExtentsAllocated: us[0],
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BlocksAllocated: us[1],
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ExtentsFreed: us[2],
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BlocksFreed: us[3],
|
||||
}, nil
|
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}
|
||||
|
||||
// btreeStats builds a BTreeStats from a slice of uint32s.
|
||||
func btreeStats(us []uint32) (BTreeStats, error) {
|
||||
if l := len(us); l != 4 {
|
||||
return BTreeStats{}, fmt.Errorf("incorrect number of values for XFS btree stats: %d", l)
|
||||
}
|
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|
||||
return BTreeStats{
|
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Lookups: us[0],
|
||||
Compares: us[1],
|
||||
RecordsInserted: us[2],
|
||||
RecordsDeleted: us[3],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// BlockMappingStat builds a BlockMappingStats from a slice of uint32s.
|
||||
func blockMappingStats(us []uint32) (BlockMappingStats, error) {
|
||||
if l := len(us); l != 7 {
|
||||
return BlockMappingStats{}, fmt.Errorf("incorrect number of values for XFS block mapping stats: %d", l)
|
||||
}
|
||||
|
||||
return BlockMappingStats{
|
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Reads: us[0],
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||||
Writes: us[1],
|
||||
Unmaps: us[2],
|
||||
ExtentListInsertions: us[3],
|
||||
ExtentListDeletions: us[4],
|
||||
ExtentListLookups: us[5],
|
||||
ExtentListCompares: us[6],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// DirectoryOperationStats builds a DirectoryOperationStats from a slice of uint32s.
|
||||
func directoryOperationStats(us []uint32) (DirectoryOperationStats, error) {
|
||||
if l := len(us); l != 4 {
|
||||
return DirectoryOperationStats{}, fmt.Errorf("incorrect number of values for XFS directory operation stats: %d", l)
|
||||
}
|
||||
|
||||
return DirectoryOperationStats{
|
||||
Lookups: us[0],
|
||||
Creates: us[1],
|
||||
Removes: us[2],
|
||||
Getdents: us[3],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// TransactionStats builds a TransactionStats from a slice of uint32s.
|
||||
func transactionStats(us []uint32) (TransactionStats, error) {
|
||||
if l := len(us); l != 3 {
|
||||
return TransactionStats{}, fmt.Errorf("incorrect number of values for XFS transaction stats: %d", l)
|
||||
}
|
||||
|
||||
return TransactionStats{
|
||||
Sync: us[0],
|
||||
Async: us[1],
|
||||
Empty: us[2],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// InodeOperationStats builds an InodeOperationStats from a slice of uint32s.
|
||||
func inodeOperationStats(us []uint32) (InodeOperationStats, error) {
|
||||
if l := len(us); l != 7 {
|
||||
return InodeOperationStats{}, fmt.Errorf("incorrect number of values for XFS inode operation stats: %d", l)
|
||||
}
|
||||
|
||||
return InodeOperationStats{
|
||||
Attempts: us[0],
|
||||
Found: us[1],
|
||||
Recycle: us[2],
|
||||
Missed: us[3],
|
||||
Duplicate: us[4],
|
||||
Reclaims: us[5],
|
||||
AttributeChange: us[6],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// LogOperationStats builds a LogOperationStats from a slice of uint32s.
|
||||
func logOperationStats(us []uint32) (LogOperationStats, error) {
|
||||
if l := len(us); l != 5 {
|
||||
return LogOperationStats{}, fmt.Errorf("incorrect number of values for XFS log operation stats: %d", l)
|
||||
}
|
||||
|
||||
return LogOperationStats{
|
||||
Writes: us[0],
|
||||
Blocks: us[1],
|
||||
NoInternalBuffers: us[2],
|
||||
Force: us[3],
|
||||
ForceSleep: us[4],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// ReadWriteStats builds a ReadWriteStats from a slice of uint32s.
|
||||
func readWriteStats(us []uint32) (ReadWriteStats, error) {
|
||||
if l := len(us); l != 2 {
|
||||
return ReadWriteStats{}, fmt.Errorf("incorrect number of values for XFS read write stats: %d", l)
|
||||
}
|
||||
|
||||
return ReadWriteStats{
|
||||
Read: us[0],
|
||||
Write: us[1],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// AttributeOperationStats builds an AttributeOperationStats from a slice of uint32s.
|
||||
func attributeOperationStats(us []uint32) (AttributeOperationStats, error) {
|
||||
if l := len(us); l != 4 {
|
||||
return AttributeOperationStats{}, fmt.Errorf("incorrect number of values for XFS attribute operation stats: %d", l)
|
||||
}
|
||||
|
||||
return AttributeOperationStats{
|
||||
Get: us[0],
|
||||
Set: us[1],
|
||||
Remove: us[2],
|
||||
List: us[3],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// InodeClusteringStats builds an InodeClusteringStats from a slice of uint32s.
|
||||
func inodeClusteringStats(us []uint32) (InodeClusteringStats, error) {
|
||||
if l := len(us); l != 3 {
|
||||
return InodeClusteringStats{}, fmt.Errorf("incorrect number of values for XFS inode clustering stats: %d", l)
|
||||
}
|
||||
|
||||
return InodeClusteringStats{
|
||||
Iflush: us[0],
|
||||
Flush: us[1],
|
||||
FlushInode: us[2],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// VnodeStats builds a VnodeStats from a slice of uint32s.
|
||||
func vnodeStats(us []uint32) (VnodeStats, error) {
|
||||
// The attribute "Free" appears to not be available on older XFS
|
||||
// stats versions. Therefore, 7 or 8 elements may appear in
|
||||
// this slice.
|
||||
l := len(us)
|
||||
if l != 7 && l != 8 {
|
||||
return VnodeStats{}, fmt.Errorf("incorrect number of values for XFS vnode stats: %d", l)
|
||||
}
|
||||
|
||||
s := VnodeStats{
|
||||
Active: us[0],
|
||||
Allocate: us[1],
|
||||
Get: us[2],
|
||||
Hold: us[3],
|
||||
Release: us[4],
|
||||
Reclaim: us[5],
|
||||
Remove: us[6],
|
||||
}
|
||||
|
||||
// Skip adding free, unless it is present. The zero value will
|
||||
// be used in place of an actual count.
|
||||
if l == 7 {
|
||||
return s, nil
|
||||
}
|
||||
|
||||
s.Free = us[7]
|
||||
return s, nil
|
||||
}
|
||||
|
||||
// BufferStats builds a BufferStats from a slice of uint32s.
|
||||
func bufferStats(us []uint32) (BufferStats, error) {
|
||||
if l := len(us); l != 9 {
|
||||
return BufferStats{}, fmt.Errorf("incorrect number of values for XFS buffer stats: %d", l)
|
||||
}
|
||||
|
||||
return BufferStats{
|
||||
Get: us[0],
|
||||
Create: us[1],
|
||||
GetLocked: us[2],
|
||||
GetLockedWaited: us[3],
|
||||
BusyLocked: us[4],
|
||||
MissLocked: us[5],
|
||||
PageRetries: us[6],
|
||||
PageFound: us[7],
|
||||
GetRead: us[8],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// ExtendedPrecisionStats builds an ExtendedPrecisionStats from a slice of uint32s.
|
||||
func extendedPrecisionStats(us []uint64) (ExtendedPrecisionStats, error) {
|
||||
if l := len(us); l != 3 {
|
||||
return ExtendedPrecisionStats{}, fmt.Errorf("incorrect number of values for XFS extended precision stats: %d", l)
|
||||
}
|
||||
|
||||
return ExtendedPrecisionStats{
|
||||
FlushBytes: us[0],
|
||||
WriteBytes: us[1],
|
||||
ReadBytes: us[2],
|
||||
}, nil
|
||||
}
|
||||
|
||||
// parseUint32s parses a slice of strings into a slice of uint32s.
|
||||
func parseUint32s(ss []string) ([]uint32, error) {
|
||||
us := make([]uint32, 0, len(ss))
|
||||
for _, s := range ss {
|
||||
u, err := strconv.ParseUint(s, 10, 32)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
us = append(us, uint32(u))
|
||||
}
|
||||
|
||||
return us, nil
|
||||
}
|
||||
|
||||
// parseUint64s parses a slice of strings into a slice of uint64s.
|
||||
func parseUint64s(ss []string) ([]uint64, error) {
|
||||
us := make([]uint64, 0, len(ss))
|
||||
for _, s := range ss {
|
||||
u, err := strconv.ParseUint(s, 10, 64)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
us = append(us, u)
|
||||
}
|
||||
|
||||
return us, nil
|
||||
}
|
||||
163
vendor/github.com/prometheus/procfs/xfs/xfs.go
generated
vendored
Normal file
163
vendor/github.com/prometheus/procfs/xfs/xfs.go
generated
vendored
Normal file
@@ -0,0 +1,163 @@
|
||||
// Copyright 2017 The Prometheus Authors
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
// Package xfs provides access to statistics exposed by the XFS filesystem.
|
||||
package xfs
|
||||
|
||||
// Stats contains XFS filesystem runtime statistics, parsed from
|
||||
// /proc/fs/xfs/stat.
|
||||
//
|
||||
// The names and meanings of each statistic were taken from
|
||||
// http://xfs.org/index.php/Runtime_Stats and xfs_stats.h in the Linux
|
||||
// kernel source. Most counters are uint32s (same data types used in
|
||||
// xfs_stats.h), but some of the "extended precision stats" are uint64s.
|
||||
type Stats struct {
|
||||
// The name of the filesystem used to source these statistics.
|
||||
// If empty, this indicates aggregated statistics for all XFS
|
||||
// filesystems on the host.
|
||||
Name string
|
||||
|
||||
ExtentAllocation ExtentAllocationStats
|
||||
AllocationBTree BTreeStats
|
||||
BlockMapping BlockMappingStats
|
||||
BlockMapBTree BTreeStats
|
||||
DirectoryOperation DirectoryOperationStats
|
||||
Transaction TransactionStats
|
||||
InodeOperation InodeOperationStats
|
||||
LogOperation LogOperationStats
|
||||
ReadWrite ReadWriteStats
|
||||
AttributeOperation AttributeOperationStats
|
||||
InodeClustering InodeClusteringStats
|
||||
Vnode VnodeStats
|
||||
Buffer BufferStats
|
||||
ExtendedPrecision ExtendedPrecisionStats
|
||||
}
|
||||
|
||||
// ExtentAllocationStats contains statistics regarding XFS extent allocations.
|
||||
type ExtentAllocationStats struct {
|
||||
ExtentsAllocated uint32
|
||||
BlocksAllocated uint32
|
||||
ExtentsFreed uint32
|
||||
BlocksFreed uint32
|
||||
}
|
||||
|
||||
// BTreeStats contains statistics regarding an XFS internal B-tree.
|
||||
type BTreeStats struct {
|
||||
Lookups uint32
|
||||
Compares uint32
|
||||
RecordsInserted uint32
|
||||
RecordsDeleted uint32
|
||||
}
|
||||
|
||||
// BlockMappingStats contains statistics regarding XFS block maps.
|
||||
type BlockMappingStats struct {
|
||||
Reads uint32
|
||||
Writes uint32
|
||||
Unmaps uint32
|
||||
ExtentListInsertions uint32
|
||||
ExtentListDeletions uint32
|
||||
ExtentListLookups uint32
|
||||
ExtentListCompares uint32
|
||||
}
|
||||
|
||||
// DirectoryOperationStats contains statistics regarding XFS directory entries.
|
||||
type DirectoryOperationStats struct {
|
||||
Lookups uint32
|
||||
Creates uint32
|
||||
Removes uint32
|
||||
Getdents uint32
|
||||
}
|
||||
|
||||
// TransactionStats contains statistics regarding XFS metadata transactions.
|
||||
type TransactionStats struct {
|
||||
Sync uint32
|
||||
Async uint32
|
||||
Empty uint32
|
||||
}
|
||||
|
||||
// InodeOperationStats contains statistics regarding XFS inode operations.
|
||||
type InodeOperationStats struct {
|
||||
Attempts uint32
|
||||
Found uint32
|
||||
Recycle uint32
|
||||
Missed uint32
|
||||
Duplicate uint32
|
||||
Reclaims uint32
|
||||
AttributeChange uint32
|
||||
}
|
||||
|
||||
// LogOperationStats contains statistics regarding the XFS log buffer.
|
||||
type LogOperationStats struct {
|
||||
Writes uint32
|
||||
Blocks uint32
|
||||
NoInternalBuffers uint32
|
||||
Force uint32
|
||||
ForceSleep uint32
|
||||
}
|
||||
|
||||
// ReadWriteStats contains statistics regarding the number of read and write
|
||||
// system calls for XFS filesystems.
|
||||
type ReadWriteStats struct {
|
||||
Read uint32
|
||||
Write uint32
|
||||
}
|
||||
|
||||
// AttributeOperationStats contains statistics regarding manipulation of
|
||||
// XFS extended file attributes.
|
||||
type AttributeOperationStats struct {
|
||||
Get uint32
|
||||
Set uint32
|
||||
Remove uint32
|
||||
List uint32
|
||||
}
|
||||
|
||||
// InodeClusteringStats contains statistics regarding XFS inode clustering
|
||||
// operations.
|
||||
type InodeClusteringStats struct {
|
||||
Iflush uint32
|
||||
Flush uint32
|
||||
FlushInode uint32
|
||||
}
|
||||
|
||||
// VnodeStats contains statistics regarding XFS vnode operations.
|
||||
type VnodeStats struct {
|
||||
Active uint32
|
||||
Allocate uint32
|
||||
Get uint32
|
||||
Hold uint32
|
||||
Release uint32
|
||||
Reclaim uint32
|
||||
Remove uint32
|
||||
Free uint32
|
||||
}
|
||||
|
||||
// BufferStats contains statistics regarding XFS read/write I/O buffers.
|
||||
type BufferStats struct {
|
||||
Get uint32
|
||||
Create uint32
|
||||
GetLocked uint32
|
||||
GetLockedWaited uint32
|
||||
BusyLocked uint32
|
||||
MissLocked uint32
|
||||
PageRetries uint32
|
||||
PageFound uint32
|
||||
GetRead uint32
|
||||
}
|
||||
|
||||
// ExtendedPrecisionStats contains high precision counters used to track the
|
||||
// total number of bytes read, written, or flushed, during XFS operations.
|
||||
type ExtendedPrecisionStats struct {
|
||||
FlushBytes uint64
|
||||
WriteBytes uint64
|
||||
ReadBytes uint64
|
||||
}
|
||||
Reference in New Issue
Block a user