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consul.go
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consul.go
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package app
import (
"context"
"errors"
"fmt"
"net"
"strings"
"sync"
"time"
"github.com/MindHunter86/addie/balancer"
"github.com/MindHunter86/addie/runtime"
"github.com/MindHunter86/addie/utils"
capi "github.com/hashicorp/consul/api"
"github.com/rs/zerolog"
)
var defaultOpts = &capi.QueryOptions{
AllowStale: true,
UseCache: false,
RequireConsistent: false,
}
type consulClient struct {
*capi.Client
ctx context.Context
balancers []balancer.Balancer
}
var (
errConsulInvalidCluster = errors.New("clustername cound not be empty")
)
func newConsulClient(balancers ...balancer.Balancer) (client *consulClient, e error) {
cfg := capi.DefaultConfig()
cfg.Address = gCli.String("consul-address")
if cfg.Address == "" {
gLog.Warn().Msg("given consul address could not be empty")
return nil, errors.New("given consul address could not be empty")
}
if gCli.String("consul-service-nodes") == "" || gCli.String("consul-service-cloud") == "" {
gLog.Warn().Msg("given consul services could not be empty")
return nil, errors.New("given consul services name could not be empty")
}
for _, blcnr := range balancers {
if blcnr.GetClusterName() == "" {
e = errConsulInvalidCluster
return
}
}
client = new(consulClient)
client.Client, e = capi.NewClient(cfg)
client.balancers = balancers
return
}
func (m *consulClient) bootstrap() {
gLog.Debug().Msg("consul bootrap started")
var eventDone context.CancelFunc
m.ctx, eventDone = context.WithCancel(context.Background())
var wg sync.WaitGroup
var errs = make(chan error, 16)
// goroutine helper - consul health
listenClusterEvents := func(wait *sync.WaitGroup, ec chan error, payload func() error) {
wait.Add(1)
go func(done func(), gopayload func() error, errors chan error) {
errors <- gopayload()
done()
}(wait.Done, payload, ec)
}
// goroutine helper - consul KV
listenChanges := func(wait *sync.WaitGroup, humanize string, payload func()) {
wait.Add(1)
gLog.Debug().Msgf("consul config listener started (%s)", humanize)
go func(done, gopayload func()) {
gopayload()
done()
}(wait.Done, payload)
}
// consul health service watchdog
for _, clusterBalancer := range m.balancers {
cbalancer := clusterBalancer
listenClusterEvents(&wg, errs, func() error {
return m.listenClusterEvents(cbalancer)
})
}
// consul KV watchdog
rpatcher := gCtx.Value(utils.ContextKeyRPatcher).(chan *runtime.RuntimePatch)
listenChanges(&wg, "lottery", func() {
m.listenRuntimeConfigKey(utils.CfgLotteryChance, rpatcher)
})
listenChanges(&wg, "quality", func() {
m.listenRuntimeConfigKey(utils.CfgQualityLevel, rpatcher)
})
listenChanges(&wg, "blocklist_ips", func() {
m.listenRuntimeConfigKey(utils.CfgBlockList, rpatcher)
})
listenChanges(&wg, "blocklist", func() {
m.listenRuntimeConfigKey(utils.CfgBlockListSwitcher, rpatcher)
})
listenChanges(&wg, "limiter", func() {
m.listenRuntimeConfigKey(utils.CfgLimiterSwitcher, rpatcher)
})
listenChanges(&wg, "a5bility", func() {
m.listenRuntimeConfigKey(utils.CfgClusterA5bility, rpatcher)
})
listenChanges(&wg, "stdout-accesslog", func() {
m.listenRuntimeConfigKey(utils.CfgStdoutAccessLog, rpatcher)
})
loop:
for {
select {
case err := <-errs:
if err == nil {
continue
}
gLog.Error().Err(err).Msg("")
break loop
case <-gCtx.Done():
gLog.Debug().Msg("internal abort() has been caught")
break loop
}
}
eventDone()
gLog.Debug().Msg("waiting for goroutines")
wg.Wait()
}
func (m *consulClient) listenClusterEvents(cluster balancer.Balancer) (e error) {
gLog.Debug().Msgf("consul event listener started for cluster %s", cluster.GetClusterName())
defer gLog.Debug().Msgf("consul event listener stopped for cluster %s", cluster.GetClusterName())
var idx uint64
var servers map[string]net.IP
var fails uint8
for {
if gCtx.Err() != nil {
return
}
if fails > uint8(3) && !gCli.Bool("consul-ignore-errors") {
gLog.Error().Msg("too many unsuccessfully tempts of serverlist receiving")
return
}
if servers, idx, e = m.getHealthServers(idx, cluster.GetClusterName()); errors.Is(e, context.Canceled) {
return
} else if e != nil {
gLog.Warn().Uint8("fails", fails).Err(e).
Msg("there some problems with serverlist receiving from consul")
fails = fails + 1
time.Sleep(1 * time.Second)
continue
}
gLog.Debug().Msg("consul listenEvents iteration triggered")
fails = 0
if len(servers) == 0 {
gLog.Warn().Msg("received empty serverlist from consul")
}
if gLog.GetLevel() == zerolog.TraceLevel {
gLog.Trace().Msg("received serverlist debug")
for _, ip := range servers {
gLog.Trace().Msgf("received serverlist entry - %s", ip.String())
}
}
cluster.UpdateServers(servers)
}
}
// func (m *consulClient)
func (m *consulClient) getHealthServers(idx uint64, service string) (_ map[string]net.IP, _ uint64, e error) {
opts := *defaultOpts
opts.WaitIndex = idx
entries, meta, e := m.Health().Service(service, "", true, opts.WithContext(m.ctx))
if e != nil {
return nil, idx, e
}
var ip net.IP
var servers = make(map[string]net.IP)
for _, entry := range entries {
gLog.Debug().Msgf("new health service entry %s:%d", entry.Node.Address, entry.Service.Port)
ip = net.ParseIP(entry.Node.Address)
if ip == nil {
gLog.Warn().Msgf("there is invalid server address from consul - %s", entry.Node.Address)
continue
}
servers[entry.Node.Node] = ip
}
return servers, meta.LastIndex, e
}
func (m *consulClient) updateBlocklistSwitcher(enabled string) (e error) {
kv := &capi.KVPair{}
kv.Key, kv.Value = m.getPrefixeSettingsdKey(utils.CfgBlockListSwitcher), []byte(enabled)
_, e = m.KV().Put(kv, nil)
return e
}
func (m *consulClient) updateLimiterSwitcher(enabled string) (e error) {
kv := &capi.KVPair{}
kv.Key, kv.Value = m.getPrefixeSettingsdKey(utils.CfgLimiterSwitcher), []byte(enabled)
_, e = m.KV().Put(kv, nil)
return e
}
func (m *consulClient) addIpToBlocklist(ip string) (e error) {
var kv *capi.KVPair
if kv, e = m.getBlocklistIps(); e != nil {
return
}
if len(kv.Value) != 0 {
ips := strings.Split(string(kv.Value), ",")
ips = append(ips, ip)
kv.Value = []byte(strings.Join(ips, ","))
} else {
kv.Value = []byte(ip)
}
return m.setBlocklistIps(kv)
}
func (m *consulClient) removeIpFromBlocklist(ip string) (e error) {
var kv *capi.KVPair
if kv, e = m.getBlocklistIps(); e != nil {
return
}
if kv == nil || len(kv.Value) == 0 {
return errors.New("there is no data from consul received")
}
ips, newips := strings.Split(string(kv.Value), ","), []string{}
for _, v := range ips {
if v == ip {
gLog.Debug().Msg("given ip is found, removing from blocklist...")
continue
}
newips = append(newips, v)
}
kv.Value = []byte(strings.Join(newips, ","))
return m.setBlocklistIps(kv)
}
func (m *consulClient) resetIpsInBlocklist() (e error) {
kv := &capi.KVPair{}
kv.Key, kv.Value = m.getPrefixeSettingsdKey(utils.CfgBlockList), []byte("")
_, e = m.KV().Put(kv, nil)
return e
}
func (*consulClient) getPrefixeSettingsdKey(key string) string {
return fmt.Sprintf("%s/settings/%s", gCli.String("consul-kv-prefix"), key)
}
func (m *consulClient) getBlocklistIps() (kv *capi.KVPair, e error) {
opts, ckey := *defaultOpts, m.getPrefixeSettingsdKey(utils.CfgBlockList)
if kv, _, e = m.KV().Get(ckey, opts.WithContext(m.ctx)); errors.Is(e, context.Canceled) {
gLog.Trace().Msg("context deadline for blocklist KV get")
return
} else if e != nil {
gLog.Error().Err(e).Msgf("could not get consul value for blocklist")
return
} else if kv == nil {
gLog.Warn().Msg("consul sent empty values for blocklist; is blocklist empty?")
return &capi.KVPair{}, e
}
return
}
func (m *consulClient) setBlocklistIps(kv *capi.KVPair) (e error) {
kv.Key = m.getPrefixeSettingsdKey(utils.CfgBlockList)
if _, e = m.KV().Put(kv, nil); errors.Is(e, context.Canceled) {
gLog.Trace().Msg("context deadline for blocklist KV get")
return
} else if e != nil {
gLog.Error().Err(e).Msgf("could not get consul value for blocklist")
return
}
return
}
func (m *consulClient) listenRuntimeConfigKey(key string, rpatcher chan *runtime.RuntimePatch) {
var idx uint64
opts, ckey := *defaultOpts, m.getPrefixeSettingsdKey(key)
loop:
for {
select {
case <-m.ctx.Done():
break loop
default:
opts.WaitIndex = idx
pair, meta, e := m.KV().Get(ckey, opts.WithContext(m.ctx))
if errors.Is(e, context.Canceled) {
break loop
} else if e != nil {
gLog.Error().Err(e).Msgf("could not get consul value for %s key", key)
time.Sleep(5 * time.Second)
continue
}
if pair == nil {
gLog.Warn().Msg("consul sent empty values while runtime config getting")
time.Sleep(5 * time.Second)
continue
}
// default patch
patch := &runtime.RuntimePatch{
Type: runtime.RuntimeUtilsBindings[key],
Patch: pair.Value,
}
// exclusions:
if patch.Type == runtime.RuntimePatchBlocklistIps && len(patch.Patch) == 0 {
patch.Patch = []byte("_")
}
rpatcher <- patch
idx = meta.LastIndex
}
}
}