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driver.go
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driver.go
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// Package sqlxDriver allows for data manipulation through the github.com/jmoiron/sqlx package.
package sqlxDriver
import (
"bytes"
"fmt"
"sort"
"time"
"github.com/jmoiron/sqlx"
// We absolutely need the sqlite driver here, this whole package depends on it
"github.com/gofrs/uuid"
_ "github.com/mattn/go-sqlite3"
"github.com/vkuznecovas/mouthful/db/model"
tool "github.com/vkuznecovas/mouthful/db/tool"
"github.com/vkuznecovas/mouthful/global"
)
// Database is a database instance for sqlx
type Database struct {
DB *sqlx.DB
Queries []string
Dialect string
IsTest bool
}
// CreateThread takes the thread path and creates it in the database
func (db *Database) CreateThread(path string) (*uuid.UUID, error) {
thread, err := db.GetThread(path)
if err != nil {
if err == global.ErrThreadNotFound {
uid := global.GetUUID()
res, err := db.DB.Exec(db.DB.Rebind("INSERT INTO Thread(Id,Path) VALUES(?, ?)"), uid, path)
if err != nil {
return nil, err
}
affected, err := res.RowsAffected()
if err != nil {
return nil, err
}
if affected != 1 {
return nil, global.ErrInternalServerError
}
return &uid, err
}
return nil, err
}
return &thread.Id, nil
}
// GetThread takes the thread path and fetches it from the database
func (db *Database) GetThread(path string) (thread model.Thread, err error) {
err = db.DB.QueryRowx(db.DB.Rebind("SELECT Id, Path, CreatedAt FROM Thread where Path=? LIMIT 1"), path).StructScan(&thread)
if err != nil {
if err.Error() == "sql: no rows in result set" {
return thread, global.ErrThreadNotFound
}
return thread, err
}
return thread, err
}
// CreateComment takes in a body, author, and path and creates a comment for the given thread. If thread does not exist, it creates one
func (db *Database) CreateComment(body string, author string, path string, confirmed bool, replyTo *uuid.UUID) (*uuid.UUID, error) {
thread, err := db.GetThread(path)
if err != nil {
if err == global.ErrThreadNotFound {
threadId, err := db.CreateThread(path)
if err != nil {
return nil, err
}
uid := global.GetUUID()
if replyTo != nil {
return nil, global.ErrWrongReplyTo
}
res, err := db.DB.Exec(db.DB.Rebind("INSERT INTO Comment(Id, ThreadId, Body, Author, Confirmed, CreatedAt, ReplyTo) VALUES(?,?,?,?,?,?,?)"), uid, threadId, body, author, confirmed, time.Now().UTC(), nil)
if err != nil {
return nil, err
}
affected, err := res.RowsAffected()
if err != nil {
return nil, err
}
if affected != 1 {
return nil, global.ErrInternalServerError
}
return &uid, err
}
return nil, err
}
if replyTo != nil {
comment, err := db.GetComment(*replyTo)
if err != nil {
if err == global.ErrCommentNotFound {
return nil, global.ErrWrongReplyTo
}
return nil, err
}
// Check if the comment you're replying to actually is a part of the thread
if !bytes.Equal(comment.ThreadId.Bytes(), thread.Id.Bytes()) {
return nil, global.ErrWrongReplyTo
}
// We allow for only a single layer of nesting. (Maybe just for now? who knows.)
if comment.ReplyTo != nil && replyTo != nil {
replyTo = comment.ReplyTo
}
}
uid := global.GetUUID()
res, err := db.DB.Exec(db.DB.Rebind("INSERT INTO Comment(Id, ThreadId, Body, Author, Confirmed, CreatedAt, ReplyTo) VALUES(?,?,?,?,?,?,?)"), uid, thread.Id, body, author, confirmed, time.Now().UTC(), replyTo)
if err != nil {
return nil, err
}
_, err = res.RowsAffected()
if err != nil {
return nil, err
}
return &uid, err
}
// GetCommentsByThread gets all the comments by thread path
func (db *Database) GetCommentsByThread(path string) (comments []model.Comment, err error) {
var commentSlice model.CommentSlice
thread, err := db.GetThread(path)
if err != nil {
return nil, err
}
err = db.DB.Select(&commentSlice, db.DB.Rebind("select * from Comment where ThreadId=? and Confirmed=? and DeletedAt is null"), thread.Id, true)
if err != nil {
return nil, err
}
sort.Sort(commentSlice)
return commentSlice, nil
}
// GetComment gets comment by id
func (db *Database) GetComment(id uuid.UUID) (comment model.Comment, err error) {
err = db.DB.Get(&comment, db.DB.Rebind("select * from Comment where Id=?"), id)
if err != nil {
if err.Error() == "sql: no rows in result set" {
return comment, global.ErrCommentNotFound
}
return comment, err
}
return comment, nil
}
// UpdateComment updatesComment comment by id
func (db *Database) UpdateComment(id uuid.UUID, body, author string, confirmed bool) error {
res, err := db.DB.Exec(db.DB.Rebind("update Comment set Body=?,Author=?,Confirmed=? where Id=?"), body, author, confirmed, id)
if err != nil {
return err
}
affected, err := res.RowsAffected()
if err != nil {
return err
}
if affected == 0 {
return global.ErrCommentNotFound
}
return nil
}
// DeleteComment soft-deletes the comment by id and all the replies to it
func (db *Database) DeleteComment(id uuid.UUID) error {
res, err := db.DB.Exec(db.DB.Rebind("update Comment set DeletedAt = CURRENT_TIMESTAMP where Id=? or ReplyTo=?"), id, id)
if err != nil {
return err
}
affected, err := res.RowsAffected()
if err != nil {
return err
}
if affected == 0 {
return global.ErrCommentNotFound
}
return nil
}
// RestoreDeletedComment restores the soft-deleted comment
func (db *Database) RestoreDeletedComment(id uuid.UUID) error {
res, err := db.DB.Exec(db.DB.Rebind("update Comment set DeletedAt = null where Id=?"), id)
if err != nil {
return err
}
affected, err := res.RowsAffected()
if err != nil {
return err
}
if affected == 0 {
return global.ErrCommentNotFound
}
return nil
}
// GetAllThreads gets all the threads found in the database
func (db *Database) GetAllThreads() (threads []model.Thread, err error) {
var threadSlice model.ThreadSlice
err = db.DB.Select(&threadSlice, "select * from Thread")
if err != nil {
return threads, err
}
sort.Sort(threadSlice)
return threadSlice, err
}
// GetAllComments gets all the comments found in the database
func (db *Database) GetAllComments() (comments []model.Comment, err error) {
var commentSlice model.CommentSlice
err = db.DB.Select(&commentSlice, "select * from Comment")
if err != nil {
return comments, err
}
sort.Sort(commentSlice)
return commentSlice, err
}
// GetUnderlyingStruct returns the underlying database struct for the driver
func (db *Database) GetUnderlyingStruct() interface{} {
return db
}
// InitializeDatabase runs the queries for an initial database seed
func (db *Database) InitializeDatabase() error {
for _, v := range db.Queries {
db.DB.MustExec(v)
}
return nil
}
// GetDatabaseDialect returns the current database dialect
func (db *Database) GetDatabaseDialect() string {
return db.Dialect
}
// CleanUpStaleData removes the stale data from the database
func (db *Database) CleanUpStaleData(target global.CleanupType, timeout int64) error {
timeoutDuration := time.Duration(int64(time.Second) * timeout)
deleteFrom := time.Now().Add(-timeoutDuration).UTC()
if target == global.Deleted {
return db.CleanupDeleted(deleteFrom)
} else if target == global.Unconfirmed {
return db.CleanupUnconfirmed(deleteFrom)
}
return fmt.Errorf("Unknown cleanup type %v", target)
}
// HardDeleteComment permanently deletes the comment from a database.
func (db *Database) HardDeleteComment(commentId uuid.UUID) error {
res, err := db.DB.Exec(db.DB.Rebind("delete from Comment where Id=? or ReplyTo=?"), commentId, commentId)
if err != nil {
return err
}
affected, err := res.RowsAffected()
if err != nil {
return err
}
if affected == 0 {
return global.ErrCommentNotFound
}
return nil
}
// CleanupUnconfirmed removes the unconfirmed comments that are older than the given time
func (db *Database) CleanupUnconfirmed(olderThan time.Time) error {
query := db.DB.Rebind("select * from Comment where Confirmed=? and DeletedAt is null")
var commentSlice model.CommentSlice
err := db.DB.Select(&commentSlice, query, false)
if err != nil {
return err
}
for _, v := range commentSlice {
if v.CreatedAt.Before(olderThan) {
err = db.HardDeleteComment(v.Id)
if err != nil {
return err
}
}
}
return nil
}
// CleanupDeleted removes the deleted comments that are older than the given time
func (db *Database) CleanupDeleted(olderThan time.Time) error {
query := "select * from Comment where DeletedAt is not null"
var commentSlice model.CommentSlice
err := db.DB.Select(&commentSlice, query)
if err != nil {
return err
}
for _, v := range commentSlice {
if v.DeletedAt.Before(olderThan) {
err = db.HardDeleteComment(v.Id)
if err != nil {
return err
}
}
}
return nil
}
// WipeOutData deletes all the threads and comments in the database if the database is a test one
func (db *Database) WipeOutData() error {
if !db.IsTest {
return nil
}
if db.Dialect == "postgres" {
_, err := db.DB.Exec("truncate table Thread CASCADE")
if err != nil {
return err
}
return nil
}
tx, err := db.DB.Begin()
if err != nil {
return err
}
if db.Dialect == "mysql" {
_, err = tx.Exec("SET FOREIGN_KEY_CHECKS = 0")
if err != nil {
return err
}
}
_, err = tx.Exec("truncate table Comment")
if err != nil {
return err
}
_, err = tx.Exec("truncate table Thread")
if err != nil {
return err
}
if db.Dialect == "mysql" {
_, err = tx.Exec("SET FOREIGN_KEY_CHECKS = 1")
if err != nil {
return err
}
}
err = tx.Commit()
if err != nil {
return err
}
return nil
}
// ImportData performs the data import for the given driver
func (db *Database) ImportData(pathToDump string) error {
importThread := func(t model.Thread) error {
_, err := db.DB.Exec(db.DB.Rebind("INSERT INTO Thread(Id,Path,CreatedAt) VALUES(?, ?, ?)"), t.Id, t.Path, t.CreatedAt)
if err != nil {
return err
}
return nil
}
importComment := func(c model.Comment) error {
_, err := db.DB.Exec(db.DB.Rebind("INSERT INTO Comment(Id, ThreadId, Body, Author, Confirmed, CreatedAt, ReplyTo, DeletedAt) VALUES(?,?,?,?,?,?,?,?)"), c.Id, c.ThreadId, c.Body, c.Author, c.Confirmed, c.CreatedAt, c.ReplyTo, c.DeletedAt)
if err != nil {
return err
}
return nil
}
err := tool.ImportData(pathToDump, importThread, importComment)
return err
}