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store.go
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store.go
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package store
import (
"encoding/json"
"errors"
"sort"
"strings"
"time"
"github.com/tinode/chat/server/auth"
"github.com/tinode/chat/server/db"
"github.com/tinode/chat/server/media"
"github.com/tinode/chat/server/store/types"
"github.com/tinode/chat/server/validate"
)
var adp adapter.Adapter
var mediaHandler media.Handler
// Unique ID generator
var uGen types.UidGenerator
type configType struct {
// 16-byte key for XTEA. Used to initialize types.UidGenerator
UidKey []byte `json:"uid_key"`
// Configurations for individual adapters.
Adapters map[string]json.RawMessage `json:"adapters"`
}
func openAdapter(workerId int, jsonconf string) error {
var config configType
if err := json.Unmarshal([]byte(jsonconf), &config); err != nil {
return errors.New("store: failed to parse config: " + err.Error() + "(" + jsonconf + ")")
}
if adp == nil {
return errors.New("store: database adapter is missing")
}
if adp.IsOpen() {
return errors.New("store: connection is already opened")
}
// Initialise snowflake
if workerId < 0 || workerId > 1023 {
return errors.New("store: invalid worker ID")
}
if err := uGen.Init(uint(workerId), config.UidKey); err != nil {
return errors.New("store: failed to init snowflake: " + err.Error())
}
var adapterConfig string
if config.Adapters != nil {
adapterConfig = string(config.Adapters[adp.GetName()])
}
return adp.Open(adapterConfig)
}
// Open initializes the persistence system. Adapter holds a connection pool for a database instance.
// name - name of the adapter rquested in the config file
// jsonconf - configuration string
func Open(workerId int, jsonconf string) error {
if err := openAdapter(workerId, jsonconf); err != nil {
return err
}
return adp.CheckDbVersion()
}
// Close terminates connection to persistent storage.
func Close() error {
if adp.IsOpen() {
return adp.Close()
}
return nil
}
// IsOpen checks if persistent storage connection has been initialized.
func IsOpen() bool {
if adp != nil {
return adp.IsOpen()
}
return false
}
// GetAdapterName returns the name of the current adater.
func GetAdapterName() string {
if adp != nil {
return adp.GetName()
}
return ""
}
// InitDb creates a new database instance. If 'reset' is true it will first attempt to drop
// existing database. If jsconf is nil it will assume that the connection is already open.
// If it's non-nil, it will use the config string to open the DB connection first.
func InitDb(jsonconf string, reset bool) error {
if !IsOpen() {
if err := openAdapter(1, jsonconf); err != nil {
return err
}
}
return adp.CreateDb(reset)
}
// RegisterAdapter makes a persistence adapter available.
// If Register is called twice or if the adapter is nil, it panics.
func RegisterAdapter(name string, a adapter.Adapter) {
if a == nil {
panic("store: Register adapter is nil")
}
if adp != nil {
panic("store: adapter '" + adp.GetName() + "' is already registered")
}
adp = a
}
// GetUid generates a unique ID suitable for use as a primary key.
func GetUid() types.Uid {
return uGen.Get()
}
// GetUidString generate unique ID as string
func GetUidString() string {
return uGen.GetStr()
}
// DecodeUid takes an XTEA encrypted Uid and decrypts it into an int64.
// This is needed for sql compatibility. Tte original int64 values
// are generated by snowflake which ensures that the top bit is unset.
func DecodeUid(uid types.Uid) int64 {
if uid.IsZero() {
return 0
}
return uGen.DecodeUid(uid)
}
// EncodeUid applies XTEA encryption to an int64 value. It's the inverse of DecodeUid.
func EncodeUid(id int64) types.Uid {
if id == 0 {
return types.ZeroUid
}
return uGen.EncodeInt64(id)
}
// UsersObjMapper is a users struct to hold methods for persistence mapping for the User object.
type UsersObjMapper struct{}
// Users is the ancor for storing/retrieving User objects
var Users UsersObjMapper
// Create inserts User object into a database, updates creation time and assigns UID
func (UsersObjMapper) Create(user *types.User, private interface{}) (*types.User, error) {
user.SetUid(GetUid())
user.InitTimes()
err := adp.UserCreate(user)
if err != nil {
return nil, err
}
// Create user's subscription to 'me' && 'find'. These topics are ephemeral, the topic object need not to be
// inserted.
err = Subs.Create(
&types.Subscription{
ObjHeader: types.ObjHeader{CreatedAt: user.CreatedAt},
User: user.Id,
Topic: user.Uid().UserId(),
ModeWant: types.ModeCSelf,
ModeGiven: types.ModeCSelf,
Private: private,
},
&types.Subscription{
ObjHeader: types.ObjHeader{CreatedAt: user.CreatedAt},
User: user.Id,
Topic: user.Uid().FndName(),
ModeWant: types.ModeCSelf,
ModeGiven: types.ModeCSelf,
Private: nil,
})
if err != nil {
// Best effort to delete incomplete user record. Orphaned user records are not a problem.
// They just take up space.
adp.UserDelete(user.Uid(), false)
return nil, err
}
return user, nil
}
// GetAuthRecord takes a user ID and a authentication scheme name, fetches unique scheme-dependent identifier and
// authentication secret.
func (UsersObjMapper) GetAuthRecord(user types.Uid, scheme string) (string, auth.Level, []byte, time.Time, error) {
unique, authLvl, secret, expires, err := adp.AuthGetRecord(user, scheme)
if err == nil {
parts := strings.Split(unique, ":")
unique = parts[1]
}
return unique, authLvl, secret, expires, err
}
// GetAuthUniqueRecord takes a unique identifier and a authentication scheme name, fetches user ID and
// authentication secret.
func (UsersObjMapper) GetAuthUniqueRecord(scheme, unique string) (types.Uid, auth.Level, []byte, time.Time, error) {
return adp.AuthGetUniqueRecord(scheme + ":" + unique)
}
// AddAuthRecord creates a new authentication record for the given user.
func (UsersObjMapper) AddAuthRecord(uid types.Uid, authLvl auth.Level, scheme, unique string, secret []byte,
expires time.Time) (bool, error) {
return adp.AuthAddRecord(uid, scheme, scheme+":"+unique, authLvl, secret, expires)
}
// UpdateAuthRecord updates authentication record with a new secret and expiration time.
func (UsersObjMapper) UpdateAuthRecord(uid types.Uid, authLvl auth.Level, scheme, unique string,
secret []byte, expires time.Time) (bool, error) {
return adp.AuthUpdRecord(uid, scheme, scheme+":"+unique, authLvl, secret, expires)
}
// DelAuthRecords deletes user's all auth records of the given scheme.
func (UsersObjMapper) DelAuthRecords(uid types.Uid, scheme string) error {
return adp.AuthDelRecord(uid, scheme)
}
// Get returns a user object for the given user id
func (UsersObjMapper) Get(uid types.Uid) (*types.User, error) {
return adp.UserGet(uid)
}
// GetAll returns a slice of user objects for the given user ids
func (UsersObjMapper) GetAll(uid ...types.Uid) ([]types.User, error) {
return adp.UserGetAll(uid...)
}
// Delete deletes user records.
func (UsersObjMapper) Delete(id types.Uid, soft bool) error {
if !soft {
adp.SubsDelForUser(id)
// TODO: Maybe delete topics where the user is the owner and all subscriptions to those topics,
// and messages
adp.AuthDelAllRecords(id)
adp.CredDel(id, "")
}
adp.UserDelete(id, soft)
return errors.New("store: not implemented")
}
// UpdateLastSeen updates LastSeen and UserAgent.
func (UsersObjMapper) UpdateLastSeen(uid types.Uid, userAgent string, when time.Time) error {
return adp.UserUpdate(uid, map[string]interface{}{"LastSeen": when, "UserAgent": userAgent})
}
// Update is a generic user data update.
func (UsersObjMapper) Update(uid types.Uid, update map[string]interface{}) error {
update["UpdatedAt"] = types.TimeNow()
return adp.UserUpdate(uid, update)
}
// GetSubs loads a list of subscriptions for the given user
func (UsersObjMapper) GetSubs(id types.Uid, opts *types.QueryOpt) ([]types.Subscription, error) {
return adp.SubsForUser(id, false, opts)
}
// FindSubs find a list of users and topics for the given tags. Results are formatted as subscriptions.
func (UsersObjMapper) FindSubs(id types.Uid, required, optional []string) ([]types.Subscription, error) {
usubs, err := adp.FindUsers(id, required, optional)
if err != nil {
return nil, err
}
tsubs, err := adp.FindTopics(required, optional)
if err != nil {
return nil, err
}
return append(usubs, tsubs...), nil
}
// GetTopics load a list of user's subscriptions with Public field copied to subscription
func (UsersObjMapper) GetTopics(id types.Uid, opts *types.QueryOpt) ([]types.Subscription, error) {
return adp.TopicsForUser(id, false, opts)
}
// GetTopicsAny load a list of user's subscriptions with Public field copied to subscription.
// Deleted topics are returned too.
func (UsersObjMapper) GetTopicsAny(id types.Uid, opts *types.QueryOpt) ([]types.Subscription, error) {
return adp.TopicsForUser(id, true, opts)
}
// SaveCred saves a credential validation request.
func (UsersObjMapper) SaveCred(cred *types.Credential) error {
cred.InitTimes()
return adp.CredAdd(cred)
}
// ConfirmCred marks credential as confirmed.
func (UsersObjMapper) ConfirmCred(id types.Uid, method string) error {
return adp.CredConfirm(id, method)
}
// FailCred increments fail count.
func (UsersObjMapper) FailCred(id types.Uid, method string) error {
return adp.CredFail(id, method)
}
// GetCred gets a list of confirmed credentials.
func (UsersObjMapper) GetCred(id types.Uid, method string) (*types.Credential, error) {
var creds []*types.Credential
var err error
if creds, err = adp.CredGet(id, method); err == nil {
if len(creds) > 0 {
return creds[0], nil
}
return nil, nil
}
return nil, err
}
// GetAllCred retrieves all confimed credential for the given user.
func (UsersObjMapper) GetAllCred(id types.Uid) ([]*types.Credential, error) {
return adp.CredGet(id, "")
}
// TopicsObjMapper is a struct to hold methods for persistence mapping for the topic object.
type TopicsObjMapper struct{}
// Topics is an instance of TopicsObjMapper to map methods to.
var Topics TopicsObjMapper
// Create creates a topic and owner's subscription to it.
func (TopicsObjMapper) Create(topic *types.Topic, owner types.Uid, private interface{}) error {
topic.InitTimes()
topic.TouchedAt = &topic.CreatedAt
err := adp.TopicCreate(topic)
if err != nil {
return err
}
if !owner.IsZero() {
err = Subs.Create(&types.Subscription{
ObjHeader: types.ObjHeader{CreatedAt: topic.CreatedAt},
User: owner.String(),
Topic: topic.Id,
ModeGiven: types.ModeCFull,
ModeWant: topic.GetAccess(owner),
Private: private})
}
return err
}
// CreateP2P creates a P2P topic by generating two user's subsciptions to each other.
func (TopicsObjMapper) CreateP2P(initiator, invited *types.Subscription) error {
initiator.InitTimes()
initiator.SetTouchedAt(&initiator.CreatedAt)
invited.InitTimes()
invited.SetTouchedAt((&invited.CreatedAt))
return adp.TopicCreateP2P(initiator, invited)
}
// Get a single topic with a list of relevant users de-normalized into it
func (TopicsObjMapper) Get(topic string) (*types.Topic, error) {
return adp.TopicGet(topic)
}
// GetUsers loads subscriptions for topic plus loads user.Public
func (TopicsObjMapper) GetUsers(topic string, opts *types.QueryOpt) ([]types.Subscription, error) {
return adp.UsersForTopic(topic, false, opts)
}
// GetUsersAny is the same as GetUsers, except it loads deleted subscriptions too.
func (TopicsObjMapper) GetUsersAny(topic string, opts *types.QueryOpt) ([]types.Subscription, error) {
return adp.UsersForTopic(topic, true, opts)
}
// GetSubs loads a list of subscriptions to the given topic, user.Public and deleted
// subscriptions are not loaded
func (TopicsObjMapper) GetSubs(topic string, opts *types.QueryOpt) ([]types.Subscription, error) {
return adp.SubsForTopic(topic, false, opts)
}
// Update is a generic topic update.
func (TopicsObjMapper) Update(topic string, update map[string]interface{}) error {
update["UpdatedAt"] = types.TimeNow()
return adp.TopicUpdate(topic, update)
}
// Delete deletes topic, messages, attachments, and subscriptions.
func (TopicsObjMapper) Delete(topic string) error {
if err := adp.SubsDelForTopic(topic); err != nil {
return err
}
if err := adp.MessageDeleteList(topic, nil); err != nil {
return err
}
return adp.TopicDelete(topic)
}
// SubsObjMapper is A struct to hold methods for persistence mapping for the Subscription object.
type SubsObjMapper struct{}
// Subs is an instance of SubsObjMapper to map methods to.
var Subs SubsObjMapper
// Create creates multiple subscriptions
func (SubsObjMapper) Create(subs ...*types.Subscription) error {
for _, sub := range subs {
sub.InitTimes()
}
_, err := adp.TopicShare(subs)
return err
}
// Get given subscription
func (SubsObjMapper) Get(topic string, user types.Uid) (*types.Subscription, error) {
return adp.SubscriptionGet(topic, user)
}
// Update values of topic's subscriptions.
func (SubsObjMapper) Update(topic string, user types.Uid, update map[string]interface{}, updateTS bool) error {
if updateTS {
update["UpdatedAt"] = types.TimeNow()
}
return adp.SubsUpdate(topic, user, update)
}
// Delete deletes a subscription
func (SubsObjMapper) Delete(topic string, user types.Uid) error {
return adp.SubsDelete(topic, user)
}
// MessagesObjMapper is a struct to hold methods for persistence mapping for the Message object.
type MessagesObjMapper struct{}
// Messages is an instance of MessagesObjMapper to map methods to.
var Messages MessagesObjMapper
func interfaceToStringSlice(src interface{}) []string {
var dst []string
if src != nil {
if arr, ok := src.([]string); ok {
dst = arr
} else if arr, ok := src.([]interface{}); ok {
for _, val := range arr {
if str, ok := val.(string); ok {
dst = append(dst, str)
}
}
}
}
return dst
}
// Save message
func (MessagesObjMapper) Save(msg *types.Message) error {
msg.InitTimes()
// Increment topic's or user's SeqId
err := adp.TopicUpdateOnMessage(msg.Topic, msg)
if err != nil {
return err
}
// Check if the message has attachments. If so, link earlier uploaded files to message.
var attachments []string
if header, ok := msg.Head["attachments"]; ok {
// The header is typed as []interface{}, convert to []string
if arr, ok := header.([]interface{}); ok {
for _, val := range arr {
if url, ok := val.(string); ok {
// Convert attachment URLs to file IDs.
if fid := mediaHandler.GetIdFromUrl(url); !fid.IsZero() {
attachments = append(attachments, fid.String())
}
}
}
}
if len(attachments) == 0 {
delete(msg.Head, "attachments")
}
}
err = adp.MessageSave(msg)
if err != nil {
return err
}
if len(attachments) > 0 {
return adp.MessageAttachments(msg.Uid(), attachments)
}
return nil
}
// DeleteList deletes multiple messages defined by a list of ranges.
func (MessagesObjMapper) DeleteList(topic string, delID int, forUser types.Uid, ranges []types.Range) error {
var toDel *types.DelMessage
if delID > 0 {
toDel = &types.DelMessage{
Topic: topic,
DelId: delID,
DeletedFor: forUser.String(),
SeqIdRanges: ranges}
toDel.InitTimes()
}
err := adp.MessageDeleteList(topic, toDel)
if err != nil {
return err
}
if delID > 0 {
// Record ID of the delete transaction
err = adp.TopicUpdate(topic, map[string]interface{}{"DelId": delID})
if err != nil {
return err
}
// Soft-deleting will update one subscription, hard-deleting will ipdate all.
// Soft- or hard- is defined by the forUser being defined.
err = adp.SubsUpdate(topic, forUser, map[string]interface{}{"DelId": delID})
if err != nil {
return err
}
}
return err
}
// GetAll returns multiple messages.
func (MessagesObjMapper) GetAll(topic string, forUser types.Uid, opt *types.QueryOpt) ([]types.Message, error) {
return adp.MessageGetAll(topic, forUser, opt)
}
// GetDeleted returns the ranges of deleted messages and the largest DelId reported in the list.
func (MessagesObjMapper) GetDeleted(topic string, forUser types.Uid, opt *types.QueryOpt) ([]types.Range, int, error) {
dmsgs, err := adp.MessageGetDeleted(topic, forUser, opt)
if err != nil {
return nil, 0, err
}
var ranges []types.Range
var maxID int
// Flatten out the ranges
for i := range dmsgs {
dm := &dmsgs[i]
if dm.DelId > maxID {
maxID = dm.DelId
}
ranges = append(ranges, dm.SeqIdRanges...)
}
sort.Sort(types.RangeSorter(ranges))
types.RangeSorter(ranges).Normalize()
return ranges, maxID, nil
}
// Registered authentication handlers.
var authHandlers map[string]auth.AuthHandler
// RegisterAuthScheme registers an authentication scheme handler.
func RegisterAuthScheme(name string, handler auth.AuthHandler) {
name = strings.ToLower(name)
if authHandlers == nil {
authHandlers = make(map[string]auth.AuthHandler)
}
if handler == nil {
panic("RegisterAuthScheme: scheme handler is nil")
}
if _, dup := authHandlers[name]; dup {
panic("RegisterAuthScheme: called twice for scheme " + name)
}
authHandlers[name] = handler
}
// GetAuthHandler returns an auth handler by name.
func GetAuthHandler(name string) auth.AuthHandler {
return authHandlers[strings.ToLower(name)]
}
// Registered authentication handlers.
var validators map[string]validate.Validator
// RegisterValidator registers validation scheme.
func RegisterValidator(name string, v validate.Validator) {
name = strings.ToLower(name)
if validators == nil {
validators = make(map[string]validate.Validator)
}
if v == nil {
panic("RegisterValidator: validator is nil")
}
if _, dup := validators[name]; dup {
panic("RegisterValidator: called twice for validator " + name)
}
validators[name] = v
}
// GetValidator returns registered validator by name.
func GetValidator(name string) validate.Validator {
return validators[strings.ToLower(name)]
}
// DeviceMapper is a struct to map methods used for handling device IDs, used to generate push notifications.
type DeviceMapper struct{}
// Devices is an instance of DeviceMapper to map methods to.
var Devices DeviceMapper
// Update updates a device record.
func (DeviceMapper) Update(uid types.Uid, oldDeviceID string, dev *types.DeviceDef) error {
// If the old device Id is specified and it's different from the new ID, delete the old id
if oldDeviceID != "" && (dev == nil || dev.DeviceId != oldDeviceID) {
if err := adp.DeviceDelete(uid, oldDeviceID); err != nil {
return err
}
}
// Insert or update the new DeviceId if one is given.
if dev != nil && dev.DeviceId != "" {
return adp.DeviceUpsert(uid, dev)
}
return nil
}
// GetAll returns all known device IDS for a given list of user IDs.
func (DeviceMapper) GetAll(uid ...types.Uid) (map[types.Uid][]types.DeviceDef, int, error) {
return adp.DeviceGetAll(uid...)
}
// Delete deletes device record for a given user.
func (DeviceMapper) Delete(uid types.Uid, deviceID string) error {
return adp.DeviceDelete(uid, deviceID)
}
// Registered media/file handlers.
var fileHandlers map[string]media.Handler
// RegisterMediaHandler saves reference to a media handler (file upload-download handler).
func RegisterMediaHandler(name string, mh media.Handler) {
if fileHandlers == nil {
fileHandlers = make(map[string]media.Handler)
}
if mh == nil {
panic("RegisterMediaHandler: handler is nil")
}
if _, dup := fileHandlers[name]; dup {
panic("RegisterMediaHandler: called twice for handler " + name)
}
fileHandlers[name] = mh
}
// GetMediaHandler returns default media handler.
func GetMediaHandler() media.Handler {
return mediaHandler
}
// UseMediaHandler sets specified media handler as default.
func UseMediaHandler(name, config string) error {
mediaHandler = fileHandlers[name]
if mediaHandler == nil {
panic("UseMediaHandler: unknown handler '" + name + "'")
}
return mediaHandler.Init(config)
}
// FileMapper is a struct to map methods used for file handling.
type FileMapper struct{}
// Files is an instance of FileMapper to be used for handling file uploads.
var Files FileMapper
// StartUpload records that the given user initiated a file upload
func (FileMapper) StartUpload(fd *types.FileDef) error {
fd.Status = types.UploadStarted
return adp.FileStartUpload(fd)
}
// FinishUpload marks started upload as successfully finished.
func (FileMapper) FinishUpload(fid string, success bool, size int64) (*types.FileDef, error) {
status := types.UploadCompleted
if !success {
status = types.UploadFailed
}
return adp.FileFinishUpload(fid, status, size)
}
// Get fetches a file record for a unique file id.
func (FileMapper) Get(fid string) (*types.FileDef, error) {
return adp.FileGet(fid)
}
// DeleteUnused removes unused attachments.
func (FileMapper) DeleteUnused(olderThan time.Time, limit int) error {
toDel, err := adp.FileDeleteUnused(olderThan, limit)
if err != nil {
return err
}
if len(toDel) > 0 {
return GetMediaHandler().Delete(toDel)
}
return nil
}