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datastore.go
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datastore.go
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package store
import (
"database/sql"
"errors"
"fmt"
"sync"
"time"
"github.com/go-redis/redis"
"github.com/go-sql-driver/mysql"
lru "github.com/hashicorp/golang-lru"
"github.com/tcotav/golinks/routes"
// database driver for sql package
"github.com/mattn/go-sqlite3"
_ "github.com/mattn/go-sqlite3"
)
// See: https://golang.org/pkg/database/sql/
// Store is the data structure wrapping the underlying database interactions. It contains
// the handle to the database, i.e. the database handle representing a pool of zero or
// more underlying connections.
type DataStore struct {
init sync.Once
dbtype string
redisTTL time.Duration
db *sql.DB
cache *lru.Cache
redis *redis.Client
}
var (
sharedStore *DataStore = &DataStore{}
)
// GetStore is the constructor for the Store struct and does the actual work of creating the DB handler.
func GetStore(dbtype string, dbConn *sql.DB, redisClient *redis.Client, redisTTL int) (*DataStore, error) {
if (DataStore{}) != *sharedStore { // did we init store already
return sharedStore, nil // if so, hand it back
}
return NewStore(dbtype, dbConn, redisClient, redisTTL)
}
func NewStore(dbtype string, dbConn *sql.DB, redisClient *redis.Client, redisTTL int) (*DataStore, error) {
var cache *lru.Cache
if redisClient == nil {
cache, _ = lru.New(500)
}
newStore := &DataStore{dbtype: dbtype, db: dbConn, cache: cache, redis: redisClient, redisTTL: (time.Duration(redisTTL) * time.Second)}
// end database setup
return newStore, nil
}
func (s *DataStore) GetUser(username string) (*User, error) {
// create or get
rows, err := s.db.Query(GetSQL(s.dbtype, "getUser"), username)
if err != nil {
return &User{}, err
}
defer rows.Close()
var user User
for rows.Next() {
err := rows.Scan(&user.ID, &user.Name, &user.IsAdmin)
if err != nil {
return &User{}, err
}
return &user, nil
}
now := time.Now()
stmt, err := s.db.Prepare(GetSQL(s.dbtype, "insertUser"))
if err != nil {
return &User{}, err
}
res, err := stmt.Exec(username, now, 0)
if err != nil {
return &User{}, err
}
id, err := res.LastInsertId()
if err != nil {
return &User{}, err
}
return &User{ID: int(id), Name: username}, nil
}
func (s *DataStore) DumpAllRoutes() ([]routes.Route, error) {
rows, err := s.db.Query(GetSQL(s.dbtype, "getAllRoutes"))
if err != nil {
return nil, err
}
defer rows.Close()
var r routes.Route
routeList := make([]routes.Route, 0)
for rows.Next() {
err := rows.Scan(&r.ShortKey, &r.URL, &r.Creator, &r.Team, &r.LastModifiedBy)
if err != nil {
return nil, err
}
routeList = append(routeList, r)
}
return routeList, nil
}
func (s *DataStore) GetAllUsers() error {
rows, err := s.db.Query(GetSQL(s.dbtype, "getAllUsers"))
if err != nil {
return err
}
defer rows.Close()
var user User
for rows.Next() {
err := rows.Scan(&user.ID, &user.Name, &user.IsAdmin)
if err != nil {
return err
}
fmt.Println(user)
}
return nil
}
func (s *DataStore) MakeAdmin(username string, admin string) (int, error) {
// is admin authorized to do this?
adminUser, err := s.GetUser(admin)
if err != nil {
return -1, err
}
if adminUser.IsAdmin != 1 {
return -1, fmt.Errorf("%s is not an admin, makeadmin called failed.", admin)
}
u, err := s.GetUser(username)
if err != nil {
return -1, err
}
now := time.Now().Format(routes.TimeFormat)
res, err := s.db.Exec(GetSQL(s.dbtype, "makeUserAdmin"), now, adminUser.ID, u.ID)
if err != nil {
return -1, err
}
affect, err := res.RowsAffected()
if err != nil {
return -1, err
}
return int(affect), nil
}
// Lock locks the entry so that it requires admin to unlock and change
func (s *DataStore) Lock(r routes.Route) (int, error) {
now := time.Now()
user, err := s.GetUser(r.LastModifiedBy)
if err != nil {
return -1, err
}
if user.IsAdmin != 1 {
return -1, fmt.Errorf("User %s is not admin", user.Name)
}
res, err := s.db.Exec(GetSQL(s.dbtype, "updateURLLock"), user.ID, now, r.ShortKey)
if err != nil {
return -1, err
}
affect, err := res.RowsAffected()
if err != nil {
return -1, err
}
return int(affect), nil
}
func (s *DataStore) Add(r routes.Route) (int, error) {
stmt, err := s.db.Prepare(GetSQL(s.dbtype, "insertRoute"))
if err != nil {
return -1, err
}
u, err := s.GetUser(r.Creator)
if err != nil {
return -1, err
}
res, err := stmt.Exec(r.ShortKey, r.URL, u.ID, r.Team, r.CreatedAt, r.ModifiedAt, u.ID)
if err != nil {
return -1, err
}
affect, err := res.RowsAffected()
if err != nil {
return -1, err
}
return int(affect), nil
}
func (s *DataStore) GetRandomURL(k string) (routes.Route, error) {
// get count of rows in url list
//
return routes.Route{}, nil
}
// Get is
func (s *DataStore) Get(k string) (routes.Route, error) {
rows, err := s.db.Query(GetSQL(s.dbtype, "getRouteSQL"), k)
if err != nil {
return routes.Route{}, err
}
defer rows.Close()
var r routes.Route
for rows.Next() {
err := rows.Scan(&r.ShortKey, &r.URL, &r.CreatedAt, &r.Creator, &r.Team, &r.ModifiedAt, &r.LastModifiedBy)
if err != nil {
return routes.Route{}, err
}
return r, nil
}
return routes.Route{}, errors.New("No match found")
}
// GetURL is the main entry point for the app. It is the shortlink. The other getters are
// designed for potentially slower access via an editor tool.
func (s *DataStore) GetURL(k string) (string, error) {
// we should not use the local cache if we have redis as that assumes we have multiple nodes
// and could have a local cache go stale
if s.redis != nil {
sRet, _ := s.redis.Get(k).Result()
if sRet != "" {
// update lcl cache and return
return sRet, nil
}
} else if s.cache != nil { // check local cache for single node runs
v, ok := s.cache.Get(k)
if ok {
return v.(string), nil
}
}
// then database
rows, err := s.db.Query(GetSQL(s.dbtype, "getURLSQL"), k)
if err != nil {
return "", err
}
defer rows.Close()
var url string
for rows.Next() {
err := rows.Scan(&url)
if err != nil {
return "", err
}
if s.redis != nil {
// update redis cache
s.redis.Set(k, url, s.redisTTL).Err()
} else if s.cache != nil {
// update local cache
s.cache.Add(k, url)
}
return url, nil
}
return "", errors.New("No match found")
}
func (s *DataStore) Modify(r routes.Route) (int, error) {
// what about case where we are changing the shortkey -- how to invalidate caches?
now := time.Now().Format(routes.TimeFormat)
user, err := s.GetUser(r.LastModifiedBy)
if err != nil {
return -1, err
}
// double check the lock status of the key in question before we move on
// then database
rows, err := s.db.Query(GetSQL(s.dbtype, "getURLIsLocked"), r.ShortKey)
if err != nil {
return -1, err
}
defer rows.Close()
var isLocked int
for rows.Next() {
err := rows.Scan(&isLocked)
if err != nil {
return -1, err
}
}
// exit if not allowed in
if isLocked == 1 && user.IsAdmin != 1 {
return -1, fmt.Errorf("User %s is not admin", user.Name)
}
// then move on
res, err := s.db.Exec(GetSQL(s.dbtype, "updateURLSQL"), r.URL, user.ID, now, r.ShortKey)
if err != nil {
return -1, err
}
affect, err := res.RowsAffected()
if err != nil {
return -1, err
}
// update the cache
// is it in the cache
// if it is, change the url
if s.redis != nil {
s.redis.Set(r.ShortKey, r.URL, s.redisTTL).Err()
} else if s.cache != nil {
if _, ok := s.cache.Get(r.ShortKey); !ok {
s.cache.Remove(r.ShortKey)
s.cache.Add(r.ShortKey, r.URL)
}
}
return int(affect), nil
}
func (s *DataStore) Delete(k string) error {
// what about case where we are changing the shortkey -- how to invalidate caches?
res, err := s.db.Exec(GetSQL(s.dbtype, "deleteRouteSQL"), k)
if err != nil {
return err
}
affect, err := res.RowsAffected()
if err != nil {
return err
}
if affect != 1 {
return fmt.Errorf("Invalid delete for %s -- impacted %d rows", k, affect)
}
// update the cache
// is it in the cache
// if it is, change the url
if s.redis != nil {
s.redis.Del(k).Err()
} else if s.cache != nil {
if _, ok := s.cache.Get(k); !ok {
s.cache.Remove(k)
}
}
return nil
}
func (s *DataStore) IsSQLErrUniqueContraint(err error) bool {
if s.dbtype == "sqlite" {
if driverErr, ok := err.(sqlite3.Error); ok {
if driverErr.ExtendedCode == sqlite3.ErrConstraintUnique {
return true
}
}
return false
} else if s.dbtype == "mysql" {
// 1062 duplicate key
//
if driverErr, ok := err.(*mysql.MySQLError); ok {
if driverErr.Number == 1169 || driverErr.Number == 1062 {
return true
}
}
return false
}
return false
}
func (s *DataStore) IsSQLErrDuplicateContraint(err error) bool {
if s.dbtype == "sqlite" {
// (1555) SQLITE_CONSTRAINT_PRIMARYKEY
// (2579) SQLITE_CONSTRAINT_ROWID
if driverErr, ok := err.(sqlite3.Error); ok {
if driverErr.Code == sqlite3.ErrConstraint {
return true
}
}
return false
} else if s.dbtype == "mysql" {
// 1062 duplicate key
//
if driverErr, ok := err.(*mysql.MySQLError); ok {
if driverErr.Number == 1062 {
return true
}
}
return false
}
return false
}
/* round 2
func (s *RouteStore) GetAllForUser(string) []routes.Route{ }
func (s *RouteStore) GetRecentlyAdded() []routes.Route{}
func (s *RouteStore) GetRecentlyModified() []routes.Route {}
*/