/
functionServiceCache.go
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/
functionServiceCache.go
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/*
Copyright 2016 The Fission 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 fscache
import (
"context"
"fmt"
"sync"
"time"
"github.com/pkg/errors"
"go.opentelemetry.io/otel/attribute"
"go.uber.org/zap"
apiv1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
fv1 "github.com/fission/fission/pkg/apis/core/v1"
"github.com/fission/fission/pkg/cache"
"github.com/fission/fission/pkg/crd"
ferror "github.com/fission/fission/pkg/error"
"github.com/fission/fission/pkg/executor/metrics"
)
type fscRequestType int
//type executorType int
// FunctionServiceCache Request Types
const (
TOUCH fscRequestType = iota
LISTOLD
LOG
LISTOLDPOOL
)
type (
// FuncSvc represents a function service
FuncSvc struct {
Name string // Name of object
Function *metav1.ObjectMeta // function this pod/service is for
Environment *fv1.Environment // function's environment
Address string // Host:Port or IP:Port that the function's service can be reached at.
KubernetesObjects []apiv1.ObjectReference // Kubernetes Objects (within the function namespace)
Executor fv1.ExecutorType
CPULimit resource.Quantity
Ctime time.Time
Atime time.Time
}
// FunctionServiceCache represents the function service cache
FunctionServiceCache struct {
logger *zap.Logger
byFunction *cache.Cache // function-key -> funcSvc : map[string]*funcSvc
byAddress *cache.Cache // address -> function : map[string]metav1.ObjectMeta
byFunctionUID *cache.Cache // function uid -> function : map[string]metav1.ObjectMeta
connFunctionCache *PoolCache // function-key -> funcSvc : map[string]*funcSvc
PodToFsvc sync.Map // pod-name -> funcSvc: map[string]*FuncSvc
WebsocketFsvc sync.Map // funcSvc-name -> bool: map[string]bool
requestChannel chan *fscRequest
}
fscRequest struct {
requestType fscRequestType
address string
age time.Duration
responseChannel chan *fscResponse
}
fscResponse struct {
objects []*FuncSvc
error
}
)
// IsNotFoundError checks if err is ErrorNotFound.
func IsNotFoundError(err error) bool {
if fe, ok := err.(ferror.Error); ok {
return fe.Code == ferror.ErrorNotFound
}
return false
}
// IsNameExistError checks if err is ErrorNameExists.
func IsNameExistError(err error) bool {
if fe, ok := err.(ferror.Error); ok {
return fe.Code == ferror.ErrorNameExists
}
return false
}
// MakeFunctionServiceCache starts and returns an instance of FunctionServiceCache.
func MakeFunctionServiceCache(logger *zap.Logger) *FunctionServiceCache {
fsc := &FunctionServiceCache{
logger: logger.Named("function_service_cache"),
byFunction: cache.MakeCache(0, 0),
byAddress: cache.MakeCache(0, 0),
byFunctionUID: cache.MakeCache(0, 0),
connFunctionCache: NewPoolCache(logger.Named("conn_function_cache")),
requestChannel: make(chan *fscRequest),
}
go fsc.service()
return fsc
}
func (fsc *FunctionServiceCache) service() {
for {
req := <-fsc.requestChannel
resp := &fscResponse{}
switch req.requestType {
case TOUCH:
// update atime for this function svc
resp.error = fsc._touchByAddress(req.address)
case LISTOLD:
// get svcs idle for > req.age
fscs := fsc.byFunctionUID.Copy()
funcObjects := make([]*FuncSvc, 0)
for _, funcSvc := range fscs {
mI := funcSvc.(metav1.ObjectMeta)
fsvcI, err := fsc.byFunction.Get(crd.CacheKey(&mI))
if err != nil {
fsc.logger.Error("error while getting service", zap.Any("error", err))
return
}
fsvc := fsvcI.(*FuncSvc)
if time.Since(fsvc.Atime) > req.age {
funcObjects = append(funcObjects, fsvc)
}
}
resp.objects = funcObjects
case LOG:
fsc.logger.Info("dumping function service cache")
funcCopy := fsc.byFunction.Copy()
info := []string{}
for key, fsvcI := range funcCopy {
fsvc := fsvcI.(*FuncSvc)
for _, kubeObj := range fsvc.KubernetesObjects {
info = append(info, fmt.Sprintf("%v\t%v\t%v", key, kubeObj.Kind, kubeObj.Name))
}
}
fsc.logger.Info("function service cache", zap.Int("item_count", len(funcCopy)), zap.Strings("cache", info))
case LISTOLDPOOL:
fscs := fsc.connFunctionCache.ListAvailableValue()
funcObjects := make([]*FuncSvc, 0)
for _, fsvc := range fscs {
if time.Since(fsvc.Atime) > req.age {
funcObjects = append(funcObjects, fsvc)
}
}
resp.objects = funcObjects
}
req.responseChannel <- resp
}
}
// GetByFunction gets a function service from cache using function key.
func (fsc *FunctionServiceCache) GetByFunction(m *metav1.ObjectMeta) (*FuncSvc, error) {
key := crd.CacheKey(m)
fsvcI, err := fsc.byFunction.Get(key)
if err != nil {
return nil, err
}
// update atime
fsvc := fsvcI.(*FuncSvc)
fsvc.Atime = time.Now()
fsvcCopy := *fsvc
return &fsvcCopy, nil
}
// GetFuncSvc gets a function service from pool cache using function key and returns number of active instances of function pod
func (fsc *FunctionServiceCache) GetFuncSvc(ctx context.Context, m *metav1.ObjectMeta, requestsPerPod int) (*FuncSvc, int, error) {
key := crd.CacheKey(m)
fsvc, active, err := fsc.connFunctionCache.GetSvcValue(ctx, key, requestsPerPod)
if err != nil {
fsc.logger.Info("Not found in Cache")
return nil, active, err
}
// update atime
fsvc.Atime = time.Now()
fsvcCopy := *fsvc
return &fsvcCopy, active, nil
}
// GetByFunctionUID gets a function service from cache using function UUID.
func (fsc *FunctionServiceCache) GetByFunctionUID(uid types.UID) (*FuncSvc, error) {
mI, err := fsc.byFunctionUID.Get(uid)
if err != nil {
return nil, err
}
m := mI.(metav1.ObjectMeta)
fsvcI, err := fsc.byFunction.Get(crd.CacheKey(&m))
if err != nil {
return nil, err
}
// update atime
fsvc := fsvcI.(*FuncSvc)
fsvc.Atime = time.Now()
fsvcCopy := *fsvc
return &fsvcCopy, nil
}
// AddFunc adds a function service to pool cache.
func (fsc *FunctionServiceCache) AddFunc(ctx context.Context, fsvc FuncSvc) {
fsc.connFunctionCache.SetSvcValue(ctx, crd.CacheKey(fsvc.Function), fsvc.Address, &fsvc, fsvc.CPULimit)
now := time.Now()
fsvc.Ctime = now
fsvc.Atime = now
}
// SetCPUUtilizaton updates/sets CPUutilization in the pool cache
func (fsc *FunctionServiceCache) SetCPUUtilizaton(key string, svcHost string, cpuUsage resource.Quantity) {
fsc.connFunctionCache.SetCPUUtilization(key, svcHost, cpuUsage)
}
// MarkAvailable marks the value at key [function][address] as available.
func (fsc *FunctionServiceCache) MarkAvailable(key string, svcHost string) {
fsc.connFunctionCache.MarkAvailable(key, svcHost)
}
// Add adds a function service to cache if it does not exist already.
func (fsc *FunctionServiceCache) Add(fsvc FuncSvc) (*FuncSvc, error) {
existing, err := fsc.byFunction.Set(crd.CacheKey(fsvc.Function), &fsvc)
if err != nil {
if IsNameExistError(err) {
f := existing.(*FuncSvc)
err2 := fsc.TouchByAddress(f.Address)
if err2 != nil {
return nil, err2
}
fCopy := *f
return &fCopy, nil
}
return nil, err
}
now := time.Now()
fsvc.Ctime = now
fsvc.Atime = now
// Add to byAddress cache. Ignore NameExists errors
// because of multiple-specialization. See issue #331.
_, err = fsc.byAddress.Set(fsvc.Address, *fsvc.Function)
if err != nil {
if IsNameExistError(err) {
err = nil
} else {
err = errors.Wrap(err, "error caching fsvc")
}
return nil, err
}
// Add to byFunctionUID cache. Ignore NameExists errors
// because of multiple-specialization. See issue #331.
_, err = fsc.byFunctionUID.Set(fsvc.Function.UID, *fsvc.Function)
if err != nil {
if IsNameExistError(err) {
err = nil
} else {
err = errors.Wrap(err, "error caching fsvc by function uid")
}
return nil, err
}
return nil, nil
}
// TouchByAddress makes a TOUCH request to given address.
func (fsc *FunctionServiceCache) TouchByAddress(address string) error {
responseChannel := make(chan *fscResponse)
fsc.requestChannel <- &fscRequest{
requestType: TOUCH,
address: address,
responseChannel: responseChannel,
}
resp := <-responseChannel
return resp.error
}
func (fsc *FunctionServiceCache) _touchByAddress(address string) error {
mI, err := fsc.byAddress.Get(address)
if err != nil {
return err
}
m := mI.(metav1.ObjectMeta)
fsvcI, err := fsc.byFunction.Get(crd.CacheKey(&m))
if err != nil {
return err
}
fsvc := fsvcI.(*FuncSvc)
fsvc.Atime = time.Now()
return nil
}
// DeleteEntry deletes a function service from cache.
func (fsc *FunctionServiceCache) DeleteEntry(fsvc *FuncSvc) {
msg := "error deleting function service"
err := fsc.byFunction.Delete(crd.CacheKey(fsvc.Function))
if err != nil {
fsc.logger.Error(
msg,
zap.String("function", fsvc.Function.Name),
zap.Error(err),
)
}
err = fsc.byAddress.Delete(fsvc.Address)
if err != nil {
fsc.logger.Error(
msg,
zap.String("function", fsvc.Function.Name),
zap.Error(err),
)
}
err = fsc.byFunctionUID.Delete(fsvc.Function.UID)
if err != nil {
fsc.logger.Error(
msg,
zap.String("function", fsvc.Function.Name),
zap.Error(err),
)
}
metrics.FuncRunningSummary.WithLabelValues(fsvc.Function.Name, fsvc.Function.Namespace).Observe(fsvc.Atime.Sub(fsvc.Ctime).Seconds())
}
// DeleteFunctionSvc deletes a function service at key composed of [function][address].
func (fsc *FunctionServiceCache) DeleteFunctionSvc(ctx context.Context, fsvc *FuncSvc) {
err := fsc.connFunctionCache.DeleteValue(ctx, crd.CacheKey(fsvc.Function), fsvc.Address)
if err != nil {
fsc.logger.Error(
"error deleting function service",
zap.Any("function", fsvc.Function.Name),
zap.Any("address", fsvc.Address),
zap.Error(err),
)
}
}
func (fsc *FunctionServiceCache) SetCPUUtilization(key string, svcHost string, cpuUsage resource.Quantity) {
fsc.connFunctionCache.SetCPUUtilization(key, svcHost, cpuUsage)
}
// DeleteOld deletes aged function service entries from cache.
func (fsc *FunctionServiceCache) DeleteOld(fsvc *FuncSvc, minAge time.Duration) (bool, error) {
if time.Since(fsvc.Atime) < minAge {
return false, nil
}
fsc.DeleteEntry(fsvc)
return true, nil
}
// DeleteOldPoolCache deletes aged function service entries from pool cache.
func (fsc *FunctionServiceCache) DeleteOldPoolCache(ctx context.Context, fsvc *FuncSvc, minAge time.Duration) (bool, error) {
if time.Since(fsvc.Atime) < minAge {
return false, nil
}
fsc.DeleteFunctionSvc(ctx, fsvc)
return true, nil
}
// ListOld returns a list of aged function services in cache.
func (fsc *FunctionServiceCache) ListOld(age time.Duration) ([]*FuncSvc, error) {
responseChannel := make(chan *fscResponse)
fsc.requestChannel <- &fscRequest{
requestType: LISTOLD,
age: age,
responseChannel: responseChannel,
}
resp := <-responseChannel
return resp.objects, resp.error
}
// ListOldForPool returns a list of aged function services in cache for pooling.
func (fsc *FunctionServiceCache) ListOldForPool(age time.Duration) ([]*FuncSvc, error) {
responseChannel := make(chan *fscResponse)
fsc.requestChannel <- &fscRequest{
requestType: LISTOLDPOOL,
age: age,
responseChannel: responseChannel,
}
resp := <-responseChannel
return resp.objects, resp.error
}
// Log makes a LOG type cache request.
func (fsc *FunctionServiceCache) Log() {
fsc.logger.Info("--- FunctionService Cache Contents")
responseChannel := make(chan *fscResponse)
fsc.requestChannel <- &fscRequest{
requestType: LOG,
responseChannel: responseChannel,
}
<-responseChannel
fsc.logger.Info("--- FunctionService Cache Contents End")
}
func GetAttributesForFuncSvc(fsvc *FuncSvc) []attribute.KeyValue {
if fsvc == nil {
return []attribute.KeyValue{}
}
var attrs []attribute.KeyValue
if fsvc.Function != nil {
attrs = append(attrs,
attribute.KeyValue{Key: "function-name", Value: attribute.StringValue(fsvc.Function.Name)},
attribute.KeyValue{Key: "function-namespace", Value: attribute.StringValue(fsvc.Function.Namespace)})
}
if fsvc.Environment != nil {
attrs = append(attrs,
attribute.KeyValue{Key: "environment-name", Value: attribute.StringValue(fsvc.Environment.Name)},
attribute.KeyValue{Key: "environment-namespace", Value: attribute.StringValue(fsvc.Environment.Namespace)})
}
if fsvc.Address != "" {
attrs = append(attrs, attribute.KeyValue{Key: "address", Value: attribute.StringValue(fsvc.Address)})
}
return attrs
}