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factory.go
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factory.go
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package factory
import (
"context"
"fmt"
"strings"
"sync"
"time"
"github.com/alphadose/haxmap"
"github.com/cockroachdb/errors"
"github.com/panjf2000/ants/v2"
"github.com/projecteru2/core/engine"
"github.com/projecteru2/core/engine/docker"
"github.com/projecteru2/core/engine/fake"
"github.com/projecteru2/core/engine/mocks/fakeengine"
"github.com/projecteru2/core/engine/systemd"
"github.com/projecteru2/core/engine/virt"
"github.com/projecteru2/core/log"
"github.com/projecteru2/core/store"
"github.com/projecteru2/core/types"
"github.com/projecteru2/core/utils"
)
type factory func(ctx context.Context, config types.Config, nodename, endpoint, ca, cert, key string) (engine.API, error)
var (
engines = map[string]factory{
docker.TCPPrefixKey: docker.MakeClient,
docker.SockPrefixKey: docker.MakeClient,
virt.GRPCPrefixKey: virt.MakeClient,
systemd.TCPPrefix: systemd.MakeClient,
fakeengine.PrefixKey: fakeengine.MakeClient,
}
engineCache *EngineCache
)
// EngineCache .
type EngineCache struct {
cache *utils.EngineCache
keysToCheck *haxmap.Map[string, engineParams]
pool *ants.PoolWithFunc
config types.Config
stor store.Store
}
// NewEngineCache .
func NewEngineCache(config types.Config, stor store.Store) *EngineCache {
pool, _ := utils.NewPool(config.MaxConcurrency)
return &EngineCache{
cache: utils.NewEngineCache(12*time.Hour, 10*time.Minute),
keysToCheck: haxmap.New[string, engineParams](),
pool: pool,
config: config,
stor: stor,
}
}
// InitEngineCache init engine cache and start engine cache checker
func InitEngineCache(ctx context.Context, config types.Config, stor store.Store) {
engineCache = NewEngineCache(config, stor)
// init the cache, we don't care the return values
if stor != nil {
_, _ = engineCache.stor.GetNodesByPod(ctx, &types.NodeFilter{
All: true,
})
}
go engineCache.CheckAlive(ctx)
go engineCache.CheckNodeStatus(ctx)
}
// Get .
func (e *EngineCache) Get(key string) engine.API {
return e.cache.Get(key)
}
// Set .
func (e *EngineCache) Set(params engineParams, client engine.API) {
e.cache.Set(params.getCacheKey(), client)
e.keysToCheck.Set(params.getCacheKey(), params)
}
// Delete .
func (e *EngineCache) Delete(key string) {
e.cache.Delete(key)
}
// CheckAlive checks if the engine in cache is available
func (e *EngineCache) CheckAlive(ctx context.Context) {
logger := log.WithFunc("engine.factory.CheckAlive")
logger.Info(ctx, "check alive starts")
defer logger.Info(ctx, "check alive ends")
defer e.pool.Release()
for {
select {
case <-ctx.Done():
return
default:
}
paramsChan := make(chan engineParams)
go func() {
e.keysToCheck.ForEach(func(_ string, v engineParams) bool {
paramsChan <- v
return true
})
close(paramsChan)
}()
wg := &sync.WaitGroup{}
for params := range paramsChan {
wg.Add(1)
params := params
_ = e.pool.Invoke(func() {
defer wg.Done()
cacheKey := params.getCacheKey()
client := e.cache.Get(cacheKey)
if client == nil {
e.cache.Delete(params.getCacheKey())
e.keysToCheck.Del(cacheKey)
return
}
if _, ok := client.(*fake.EngineWithErr); ok {
if newClient, err := newEngine(ctx, e.config, params.nodename, params.endpoint, params.ca, params.key, params.cert); err != nil {
logger.Errorf(ctx, err, "engine %+v is still unavailable", cacheKey)
e.cache.Set(cacheKey, &fake.EngineWithErr{DefaultErr: err})
// check node status
e.checkOneNodeStatus(ctx, ¶ms)
} else {
e.cache.Set(cacheKey, newClient)
}
return
}
if err := validateEngine(ctx, client, e.config.ConnectionTimeout); err != nil {
logger.Errorf(ctx, err, "engine %+v is unavailable, will be replaced and removed", cacheKey)
e.cache.Set(cacheKey, &fake.EngineWithErr{DefaultErr: err})
}
logger.Debugf(ctx, "engine %+v is available", cacheKey)
})
}
wg.Wait()
time.Sleep(e.config.ConnectionTimeout)
}
}
func (e *EngineCache) CheckNodeStatus(ctx context.Context) {
logger := log.WithFunc("engine.factory.CheckNodeStatus")
logger.Info(ctx, "check NodeStatus starts")
defer logger.Info(ctx, "check NodeStatus ends")
if e.stor == nil {
logger.Warnf(ctx, "nodeStore is nil")
return
}
for {
select {
case <-ctx.Done():
return
default:
}
ch := e.stor.NodeStatusStream(ctx)
for ns := range ch {
if ns.Alive {
// GetNode will call GetEngine, so GetNode updates the engine cache automatically
if _, err := e.stor.GetNode(ctx, ns.Nodename); err != nil {
logger.Warnf(ctx, "failed to get node %s: %s", ns.Nodename, err)
}
continue
}
// a node may have multiple engines, so we need check all key here
e.keysToCheck.ForEach(func(_ string, ep engineParams) bool {
if ep.nodename == ns.Nodename {
logger.Infof(ctx, "remove engine %+v from cache", ep.getCacheKey())
RemoveEngineFromCache(ctx, ep.endpoint, ep.ca, ep.cert, ep.key)
}
return true
})
}
}
}
// GetEngineFromCache .
func GetEngineFromCache(_ context.Context, endpoint, ca, cert, key string) engine.API {
return engineCache.Get(getEngineCacheKey(endpoint, ca, cert, key))
}
// RemoveEngineFromCache .
func RemoveEngineFromCache(ctx context.Context, endpoint, ca, cert, key string) {
cacheKey := getEngineCacheKey(endpoint, ca, cert, key)
log.WithFunc("engine.factory.RemoveEngineFromCache").Infof(ctx, "remove engine %+v from cache", cacheKey)
engineCache.Delete(cacheKey)
}
// GetEngine get engine with cache
func GetEngine(ctx context.Context, config types.Config, nodename, endpoint, ca, cert, key string) (client engine.API, err error) {
logger := log.WithFunc("engine.factory.GetEngine")
if client = GetEngineFromCache(ctx, endpoint, ca, cert, key); client != nil {
return client, nil
}
defer func() {
params := engineParams{
nodename: nodename,
endpoint: endpoint,
ca: ca,
cert: cert,
key: key,
}
cacheKey := params.getCacheKey()
if err == nil {
engineCache.Set(params, client)
logger.Infof(ctx, "store engine %+v in cache", cacheKey)
} else {
engineCache.Set(params, &fake.EngineWithErr{DefaultErr: err})
logger.Infof(ctx, "store fake engine %+v in cache", cacheKey)
}
}()
return newEngine(ctx, config, nodename, endpoint, ca, cert, key)
}
type engineParams struct {
nodename string
endpoint string
ca string
cert string
key string
}
func (ep engineParams) getCacheKey() string {
return getEngineCacheKey(ep.endpoint, ep.ca, ep.cert, ep.key)
}
func validateEngine(ctx context.Context, engine engine.API, timeout time.Duration) (err error) {
utils.WithTimeout(ctx, timeout, func(ctx context.Context) {
err = engine.Ping(ctx)
})
return err
}
func getEnginePrefix(endpoint string) (string, error) {
for prefix := range engines {
if strings.HasPrefix(endpoint, prefix) {
return prefix, nil
}
}
return "", errors.Wrapf(types.ErrInvaildNodeEndpoint, "endpoint invalid %+v", endpoint)
}
func getEngineCacheKey(endpoint, ca, cert, key string) string {
return fmt.Sprintf("%+v-%+v", endpoint, utils.SHA256(fmt.Sprintf(":%+v:%+v:%+v", ca, cert, key))[:8])
}
// newEngine get engine
func newEngine(ctx context.Context, config types.Config, nodename, endpoint, ca, cert, key string) (client engine.API, err error) {
prefix, err := getEnginePrefix(endpoint)
if err != nil {
return nil, err
}
e, ok := engines[prefix]
if !ok {
return nil, types.ErrInvaildEngineEndpoint
}
utils.WithTimeout(ctx, config.ConnectionTimeout, func(ctx context.Context) {
client, err = e(ctx, config, nodename, endpoint, ca, cert, key)
})
if err != nil {
return nil, err
}
if err = validateEngine(ctx, client, config.ConnectionTimeout); err != nil {
log.WithFunc("engine.factory.newEngine").Errorf(ctx, err, "engine of %+v is unavailable", endpoint)
return nil, err
}
return client, nil
}
func (e *EngineCache) checkOneNodeStatus(ctx context.Context, params *engineParams) {
if e.stor == nil {
return
}
logger := log.WithFunc("engine.factory.checkOneNodeStatus")
nodename := params.nodename
cacheKey := params.getCacheKey()
if ns, err := e.stor.GetNodeStatus(ctx, nodename); (err != nil && errors.Is(err, types.ErrInvaildCount)) || (!ns.Alive) {
logger.Warnf(ctx, "node %s is offline, the cache will be removed", nodename)
e.Delete(cacheKey)
}
}