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valkeyrie.go
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valkeyrie.go
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package valkeyrie
import (
"encoding/json"
"strings"
"time"
"github.com/Masterminds/semver/v3"
"github.com/abronan/valkeyrie"
"github.com/abronan/valkeyrie/store"
"github.com/cuigh/auxo/data"
"github.com/cuigh/auxo/data/set"
"github.com/cuigh/auxo/errors"
"github.com/cuigh/auxo/log"
"github.com/cuigh/auxo/net/rpc/resolver"
"github.com/cuigh/auxo/net/transport"
"github.com/cuigh/auxo/util/cast"
"github.com/cuigh/auxo/util/run"
)
const PkgName = "auxo.net.rpc.resolver.valkeyrie"
// Builder implements a common Builder based on valkeyrie.
type Builder struct {
Backend store.Backend
}
func (b *Builder) Name() string {
return string(b.Backend)
}
func (b *Builder) Build(client resolver.Client, opts data.Map) (resolver.Resolver, error) {
addrs := strings.Split(opts.Get("address").(string), ",")
timeout := cast.ToDuration(opts.Get("dial_timeout"), 10*time.Second)
username := cast.ToString(opts.Get("username"))
password := cast.ToString(opts.Get("password"))
interval := cast.ToDuration(opts.Get("refresh_interval"))
if interval <= 0 {
interval = 30 * time.Second
}
prefix := cast.ToString(opts.Get("prefix"))
if prefix == "" {
prefix = "/auxo/app"
}
// create store
kv, err := valkeyrie.NewStore(b.Backend, addrs, &store.Config{
ConnectionTimeout: timeout,
Username: username,
Password: password,
})
if err != nil {
return nil, errors.Wrap(err, "failed to create store")
}
r := &Resolver{
client: client,
store: kv,
key: prefix + "/" + client.Server,
interval: interval,
logger: log.Get(PkgName),
}
if client.Version != "" {
r.constraint, err = semver.NewConstraint(client.Version)
if err != nil {
return nil, err
}
}
return r, nil
}
// Resolver implements a common Resolver based on valkeyrie.
type Resolver struct {
client resolver.Client
store store.Store
key string
interval time.Duration
logger log.Logger
constraint *semver.Constraints
canceler run.Canceler
}
func (r *Resolver) Resolve() ([]transport.Address, error) {
return r.getAddrs()
}
func (r *Resolver) Watch(notify func([]transport.Address)) {
if r.canceler == nil {
r.canceler = run.Schedule(r.interval, func() {
addrs, err := r.getAddrs()
if err != nil {
r.logger.Error("valkeyrie > Failed to refresh addresses: ", err)
} else {
notify(addrs)
}
}, nil)
}
}
func (r *Resolver) Close() {
if r.canceler != nil {
r.canceler.Cancel()
r.logger.Debug("valkeyrie > Resolver stopped")
}
r.store.Close()
}
func (r *Resolver) getAddrs() ([]transport.Address, error) {
// $key/nodes/192.168.50.150:9999
// $key/nodes/192.168.50.151:9999
key := r.key + "/nodes"
nodes, err := r.store.List(key, nil)
if err == store.ErrKeyNotFound {
return nil, nil
} else if err != nil {
return nil, err
}
opts, err := r.getOptions()
if err != nil {
return nil, err
}
addrs := make([]transport.Address, 0, len(nodes))
for _, node := range nodes {
addr := transport.Address{
URL: node.Key[len(key)+1:],
Options: make(data.Map),
}
err = json.Unmarshal(node.Value, &addr.Options)
if err != nil {
return nil, err
}
if !r.filter(&addr, &opts) {
addrs = append(addrs, addr)
}
}
return addrs, nil
}
func (r *Resolver) getOptions() (opts appOptions, err error) {
// $key/options={"groups": {"test", ["192.168.50.150:9999"]}, "offline_nodes": ["192.168.50.151:9999"]}
var (
key = r.key + "/options"
pair *store.KVPair
)
pair, err = r.store.Get(key, nil)
if err == nil {
err = json.Unmarshal(pair.Value, &opts)
} else if err == store.ErrKeyNotFound {
err = nil
}
return
}
func (r *Resolver) filter(addr *transport.Address, opts *appOptions) bool {
if opts.offline(addr.URL) {
r.logger.Debugf("valkeyrie > Drop offline node '%s'", addr.URL)
return true
}
if r.client.Codec != "" {
v := cast.ToString(addr.Options.Get("codec"))
if v != "" {
if s := set.NewStringSet(strings.Split(v, ",")...); !s.Contains(r.client.Codec) {
return true
}
}
}
if r.constraint != nil {
v := cast.ToString(addr.Options.Get("version"))
if v == "" {
r.logger.Debugf("valkeyrie > Drop node '%s' which does not have a version option", addr.URL)
return true
}
ver, err := semver.NewVersion(v)
if err != nil {
r.logger.Debugf("valkeyrie > Drop node '%s(version: %s)' which has invalid version", addr.URL, v)
return true
}
if !r.constraint.Check(ver) {
r.logger.Debugf("valkeyrie > Drop node '%s(version: %s)' which does not meet version constraint", addr.URL, v)
return true
}
}
return false
}
type appOptions struct {
//Groups map[string][]string `json:"groups"`
OfflineNodes []string `json:"offline_nodes"`
}
func (opts *appOptions) offline(addr string) bool {
for _, n := range opts.OfflineNodes {
if n == addr {
return true
}
}
return false
}