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provider.go
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provider.go
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package consul
import (
"context"
"fmt"
"math/rand"
"strconv"
"strings"
"sync"
"time"
"github.com/airenas/go-app/pkg/goapp"
"github.com/airenas/roxy/internal/pkg/transcriber"
tapi "github.com/airenas/roxy/internal/pkg/transcriber/api"
"github.com/hashicorp/consul/api"
"go.uber.org/multierr"
)
const (
uploadKey = "uploadURL"
statusKey = "statusURL"
resultKey = "resultURL"
cleanKey = "cleanURL"
isHTTPSSLKey = "HTTPSSL"
priorityKey = "priority"
)
type Provider struct {
consul *api.Client
srvName string
lock *sync.RWMutex
trans []*trWrap
}
type trWrap struct {
real tapi.Transcriber
srv string
key string
priority float64
}
// NewProvider creates consul service registrator
func NewProvider(cfg *api.Config, srvNameInConsul string) (*Provider, error) {
c, err := api.NewClient(cfg)
if err != nil {
return nil, err
}
if srvNameInConsul == "" {
return nil, fmt.Errorf("no srv name")
}
return newProvider(c, srvNameInConsul), nil
}
func newProvider(c *api.Client, srvNameInConsul string) *Provider {
goapp.Log.Info().Str("service", srvNameInConsul).Msg("cfg: srv name in consul")
return &Provider{consul: c, srvName: srvNameInConsul, lock: &sync.RWMutex{}, trans: make([]*trWrap, 0)}
}
func (c *Provider) Get(srv string, allowNew bool) (tapi.Transcriber, string, error) {
c.lock.RLock()
defer c.lock.RUnlock()
if !allowNew {
for _, t := range c.trans {
if t.srv == srv {
return t.real, t.srv, nil
}
}
return nil, "", fmt.Errorf("no active srv `%s`", srv)
}
if len(c.trans) == 0 {
return nil, "", nil
}
// try return same
for _, t := range c.trans {
if t.srv == srv {
return t.real, t.srv, nil
}
}
if len(c.trans) == 1 {
t := c.trans[0]
return t.real, t.srv, nil
}
// else random select by priority
i, err := getRandomByPriority(c.trans)
if err != nil {
return nil, "", fmt.Errorf("can't select recognizer: %v", err)
}
if i < len(c.trans) {
t := c.trans[i]
return t.real, t.srv, nil
}
return nil, "", nil
}
func getRandomByPriority(trWraps []*trWrap) (int, error) {
prMax := 0.0
for _, tr := range trWraps {
prMax += tr.priority
}
if prMax < 0.1 {
return 0, fmt.Errorf("wrong priority sum found %f", prMax)
}
rnd := rand.Float64() * prMax
prMax = 0.0
for i, tr := range trWraps {
prMax += tr.priority
if prMax > rnd {
return i, nil
}
}
return len(trWraps), nil
}
func (c *Provider) StartRegistryLoop(ctx context.Context, checkInterval time.Duration) (<-chan struct{}, error) {
goapp.Log.Info().Msgf("Starting consul service check every %v", checkInterval)
res := make(chan struct{}, 2)
go func() {
defer close(res)
c.serviceLoop(ctx, checkInterval)
}()
return res, nil
}
func (c *Provider) serviceLoop(ctx context.Context, interval time.Duration) {
ticker := time.NewTicker(interval)
// run on startup
if err := c.check(ctx); err != nil {
goapp.Log.Error().Err(err).Send()
}
for {
select {
case <-ticker.C:
if err := c.check(ctx); err != nil {
goapp.Log.Error().Err(err).Send()
}
case <-ctx.Done():
ticker.Stop()
goapp.Log.Info().Msgf("Stopped consul timer service")
return
}
}
}
func (c *Provider) check(ctx context.Context) error {
ctxInt, cf := context.WithTimeout(ctx, time.Second*5)
defer cf()
srvs, _, err := c.consul.Health().Service(c.srvName, "", true, (&api.QueryOptions{}).WithContext(ctxInt))
if err != nil {
return fmt.Errorf("can't invoke consul: %v", err)
}
return c.updateSrv(srvs)
}
func (c *Provider) updateSrv(srvs []*api.ServiceEntry) error {
goapp.Log.Info().Msgf("got %d services from consul", len(srvs))
c.lock.Lock()
defer c.lock.Unlock()
ms := map[string]*api.ServiceEntry{}
for _, s := range srvs {
ms[key(s)] = s
}
new := []*trWrap{}
for _, s := range c.trans {
if v, ok := ms[s.srv]; ok && s.key == fullKey(v) {
new = append(new, s)
delete(ms, s.srv)
continue
}
goapp.Log.Warn().Str("service", s.srv).Msgf("dropped transcriber")
}
if len(new) == len(c.trans) && len(ms) == 0 {
return nil
}
c.trans = new
var err error
for v, k := range ms {
tr, errInt := newTranscriber(v, k)
if errInt != nil {
err = multierr.Append(err, errInt)
continue
}
c.trans = append(c.trans, tr)
goapp.Log.Info().Str("service", v).Float64("priority", tr.priority).Msg("added transcriber")
}
return err
}
func newTranscriber(v string, s *api.ServiceEntry) (*trWrap, error) {
tr, err := transcriber.NewClient(getUrl(s, uploadKey), getUrl(s, statusKey), getUrl(s, resultKey), getUrl(s, cleanKey))
if err != nil {
return nil, fmt.Errorf("can't init transcriber for %s: %v", v, err)
}
priority, err := getPriority(s)
if err != nil {
return nil, fmt.Errorf("can't init transcriber for %s: %v", v, err)
}
res := &trWrap{real: tr, srv: v, key: fullKey(s), priority: priority}
return res, nil
}
func getPriority(s *api.ServiceEntry) (float64, error) {
v, ok := s.Service.Meta[priorityKey]
if !ok {
return 1, nil
}
res, err := strconv.ParseFloat(v, 64)
if err != nil {
return 0, fmt.Errorf("can't parse priority '%s': %v", v, err)
}
if res < 0.5 || res > 50 {
return 0, fmt.Errorf("wrong priority value '%f', not in [0.5, 50]", res)
}
return res, nil
}
func getUrl(s *api.ServiceEntry, key string) string {
v, ok := s.Service.Meta[key]
if !ok {
return ""
}
ssl := ""
if isSSL, ok := s.Service.Meta[isHTTPSSLKey]; ok {
if boolValue, err := strconv.ParseBool(isSSL); err == nil && boolValue {
ssl = "s"
}
}
//todo add https support - see consul HTTP_SSL key
return fmt.Sprintf("http%s://%s:%d/%s", ssl, s.Service.Address, s.Service.Port, v)
}
func key(s *api.ServiceEntry) string {
return fmt.Sprintf("%s:%d", s.Service.Address, s.Service.Port)
}
func fullKey(s *api.ServiceEntry) string {
res := strings.Builder{}
for _, key := range [...]string{uploadKey, statusKey, resultKey, cleanKey, isHTTPSSLKey, priorityKey} {
v, ok := s.Service.Meta[key]
if ok {
res.WriteString(key + ":" + v + ",")
}
}
return res.String()
}