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discover.go
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discover.go
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//Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
//Licensed under the Universal Permissive License (UPL) Version 1.0 as shown at http://oss.oracle.com/licenses/upl.
package file
import (
"encoding/json"
"io/ioutil"
"math"
"os"
"path/filepath"
"sync"
"github.com/teramoby/speedle-plus/api/ads"
"github.com/teramoby/speedle-plus/api/pms"
"github.com/teramoby/speedle-plus/pkg/errors"
"github.com/teramoby/speedle-plus/pkg/store"
log "github.com/sirupsen/logrus"
)
type discoverRequestStore struct {
FileLocation string
rwLock sync.RWMutex
}
type RequestItem struct {
Index int64 `json:"index"`
Request *ads.RequestContext `json:"request"`
}
type StoreContent struct {
Requests []*RequestItem `json:"requests"`
}
const (
discoverStoreFileName = "speedle_discover_requests.json"
)
//read policy store from file
func (s *discoverRequestStore) ReadDiscoverRequestStore() (*StoreContent, error) {
s.rwLock.RLock()
defer s.rwLock.RUnlock()
return s.readDiscoverRequestStoreWithoutLock()
}
func (s *discoverRequestStore) readDiscoverRequestStoreWithoutLock() (*StoreContent, error) {
var drs StoreContent
raw, err := ioutil.ReadFile(s.FileLocation)
if err != nil {
return &drs, errors.Wrapf(err, errors.StoreError, "unable to read file %q", s.FileLocation)
}
if err := json.Unmarshal(raw, &drs); err != nil {
log.Warnf("error reading discover request store because of error %v", err)
return &StoreContent{}, err
}
return &drs, nil
}
func (s *discoverRequestStore) WriteDiscoverRequestStore(drs *StoreContent) error {
s.rwLock.Lock()
defer s.rwLock.Unlock()
return s.writeDiscoverRequestStoreWithoutLock(drs)
}
func (s *discoverRequestStore) writeDiscoverRequestStoreWithoutLock(drs *StoreContent) error {
jsonFile, err := os.Create(s.FileLocation)
defer jsonFile.Close()
if err != nil {
return errors.Wrapf(err, errors.StoreError, "unable to create file %q", s.FileLocation)
}
drsB, err := json.MarshalIndent(*drs, "", " ")
if err != nil {
log.Errorf("marshal indent filed becuase of %v", err)
return errors.Wrap(err, errors.SerializationError, "marshal indent failed")
}
if _, err := jsonFile.Write(drsB); err != nil {
log.Errorf("write to file failed becuase of %v", err)
return errors.Wrapf(err, errors.StoreError, "unable to write to file %q", s.FileLocation)
}
return nil
}
func getDiscoverRequestStore(s *Store) (*discoverRequestStore, error) {
s.rwLock.Lock()
defer s.rwLock.Unlock()
if s.discoverStore == nil {
dir, _ := filepath.Split(s.FileLocation)
discoverFileLocation := filepath.Join(dir, discoverStoreFileName)
if dir == "./" {
discoverFileLocation = dir + discoverStoreFileName
}
log.Infof("discover store file location:%s\n", discoverFileLocation)
if _, err := os.Stat(discoverFileLocation); os.IsNotExist(err) {
log.Infof("discover store file does not exist, create one...")
if err1 := ioutil.WriteFile(discoverFileLocation, []byte("{}"), 0644); err1 != nil {
log.Errorf("error creating discover store file: %v\n", err1)
return nil, err1
}
}
s.discoverStore = &discoverRequestStore{FileLocation: discoverFileLocation}
}
return s.discoverStore, nil
}
// SaveDiscoverRequest saves discover request
func (s *Store) SaveDiscoverRequest(discoverRequest *ads.RequestContext) error {
if discoverStore, err := getDiscoverRequestStore(s); err == nil {
return discoverStore.saveDiscoverRequest(discoverRequest)
} else {
return err
}
}
func (s *discoverRequestStore) saveDiscoverRequest(discoverRequest *ads.RequestContext) error {
s.rwLock.Lock()
defer s.rwLock.Unlock()
sContent, err := s.readDiscoverRequestStoreWithoutLock()
if err != nil {
return err
}
var idx = int64(0)
if sContent.Requests != nil && len(sContent.Requests) > 0 {
if math.MaxInt64 == sContent.Requests[len(sContent.Requests)-1].Index {
return errors.New(errors.ExceedLimit, "reach largest revision number")
}
idx = sContent.Requests[len(sContent.Requests)-1].Index + 1
}
sContent.Requests = append(sContent.Requests, &RequestItem{Index: idx, Request: discoverRequest})
return s.writeDiscoverRequestStoreWithoutLock(sContent)
}
// GetLastDiscoverRequest gets last request log
func (s *Store) GetLastDiscoverRequest(serviceName string) (*ads.RequestContext, int64, error) {
if discoverStore, err := getDiscoverRequestStore(s); err == nil {
return discoverStore.getLastDiscoverRequest(serviceName)
} else {
return nil, -1, err
}
}
func (s *discoverRequestStore) getLastDiscoverRequest(serviceName string) (*ads.RequestContext, int64, error) {
s.rwLock.RLock()
defer s.rwLock.RUnlock()
sContent, err := s.readDiscoverRequestStoreWithoutLock()
if err != nil {
return nil, -1, err
}
if sContent.Requests != nil && len(sContent.Requests) > 0 {
if serviceName == "" {
reqItem := sContent.Requests[len(sContent.Requests)-1]
return reqItem.Request, reqItem.Index, nil
}
for i := len(sContent.Requests) - 1; i >= 0; i-- {
if sContent.Requests[i].Request.ServiceName == serviceName {
reqItem := sContent.Requests[i]
return reqItem.Request, reqItem.Index, nil
}
}
}
return nil, -1, errors.Errorf(errors.EntityNotFound, "no discover request found for service %q", serviceName)
}
// GetDiscoverRequestsSinceRevision gets request logs since a revision.
func (s *Store) GetDiscoverRequestsSinceRevision(serviceName string, revision int64) ([]*ads.RequestContext, int64, error) {
if discoverStore, err := getDiscoverRequestStore(s); err == nil {
return discoverStore.getDiscoverRequestsSinceRevision(serviceName, revision)
} else {
return nil, -1, err
}
}
func (s *discoverRequestStore) getDiscoverRequestsSinceRevision(serviceName string, revision int64) ([]*ads.RequestContext, int64, error) {
s.rwLock.RLock()
defer s.rwLock.RUnlock()
sContent, err := s.readDiscoverRequestStoreWithoutLock()
if err != nil {
return nil, -1, err
}
requests := []*ads.RequestContext{}
if sContent.Requests != nil && len(sContent.Requests) > 0 {
for _, reqItem := range sContent.Requests {
if reqItem.Index > revision {
if serviceName == "" || serviceName == reqItem.Request.ServiceName {
requests = append(requests, reqItem.Request)
}
}
}
return requests, sContent.Requests[len(sContent.Requests)-1].Index, nil
}
return nil, -1, errors.Errorf(errors.EntityNotFound, "no discover request found for service %q.", serviceName)
}
// GetDiscoverRequests gets request logs for a service.
// Get all requests when serviceName is empty.
func (s *Store) GetDiscoverRequests(serviceName string) ([]*ads.RequestContext, int64, error) {
if discoverStore, err := getDiscoverRequestStore(s); err == nil {
return discoverStore.getDiscoverRequests(serviceName)
} else {
return nil, -1, err
}
}
func (s *discoverRequestStore) getDiscoverRequests(serviceName string) ([]*ads.RequestContext, int64, error) {
s.rwLock.RLock()
defer s.rwLock.RUnlock()
sContent, err := s.readDiscoverRequestStoreWithoutLock()
if err != nil {
return nil, -1, err
}
requests := []*ads.RequestContext{}
if sContent.Requests != nil && len(sContent.Requests) > 0 {
for _, reqItem := range sContent.Requests {
if serviceName == "" || serviceName == reqItem.Request.ServiceName {
requests = append(requests, reqItem.Request)
}
}
return requests, sContent.Requests[len(sContent.Requests)-1].Index, nil
}
return nil, -1, errors.Errorf(errors.EntityNotFound, "no discover request found for service %q.", serviceName)
}
// ResetDiscoverRequests cleans request logs for a service.
// Clean all request logs when serviceName is empty.
func (s *Store) ResetDiscoverRequests(serviceName string) error {
discoverStore, err := getDiscoverRequestStore(s)
if err != nil {
return err
}
return discoverStore.resetDiscoverRequests(serviceName)
}
func (s *discoverRequestStore) resetDiscoverRequests(serviceName string) error {
s.rwLock.Lock()
defer s.rwLock.Unlock()
sContent, err := s.readDiscoverRequestStoreWithoutLock()
if err != nil {
return err
}
if sContent.Requests != nil && len(sContent.Requests) != 0 {
if serviceName == "" { //reset all
sContent = &StoreContent{Requests: []*RequestItem{}}
} else {
for i := len(sContent.Requests) - 1; i >= 0; i-- {
if sContent.Requests[i].Request.ServiceName == serviceName {
sContent.Requests = append(sContent.Requests[:i], sContent.Requests[i+1:]...)
}
}
}
return s.writeDiscoverRequestStoreWithoutLock(sContent)
}
return nil
}
//Generate policies for principal based on existing request logs. Generate policies for all principals when principalXXX are empty.
func (s *Store) GeneratePolicies(serviceName, principalType, principalName, principalIDD string) (map[string]*pms.Service, int64, error) {
if discoverStore, err := getDiscoverRequestStore(s); err == nil {
return discoverStore.generatePolicies(serviceName, principalType, principalName, principalIDD)
} else {
return nil, -1, err
}
}
func (s *discoverRequestStore) generatePolicies(serviceName, principalType, principalName, principalIDD string) (map[string]*pms.Service, int64, error) {
requests, revision, err := s.getDiscoverRequests(serviceName)
if err != nil {
return nil, -1, err
}
serviceMap, err := store.GeneratePoliciesFromDiscoverRequests(requests, principalType, principalName, principalIDD)
if err != nil {
return nil, -1, err
}
return serviceMap, revision, nil
}