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pq.go
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pq.go
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package main
import (
"fmt"
"log"
"os"
"github.com/gin-gonic/gin"
"github.com/jmoiron/sqlx"
_ "github.com/lib/pq"
)
func PostgresDatabase() gin.HandlerFunc {
url := os.Getenv("DATABASE_URL")
store, err := NewPostgresStore(url)
if err != nil {
log.Fatal(err)
}
return func(c *gin.Context) {
c.Set(UserStoreKey, store)
c.Set(WhiskyStoreKey, store)
c.Set(ReviewStoreKey, store)
c.Next()
}
}
type PostgresStore struct {
getUser *sqlx.Stmt
getAllUser *sqlx.Stmt
insertUser *sqlx.NamedStmt
getWhisky *sqlx.Stmt
getAllWhisky *sqlx.Stmt
getTrendingWhisky *sqlx.Stmt
insertWhisky *sqlx.NamedStmt
updateWhisky *sqlx.NamedStmt
getReview *sqlx.Stmt
getAllReview *sqlx.Stmt
getActivity *sqlx.Stmt
insertReview *sqlx.NamedStmt
updateReview *sqlx.NamedStmt
updateReviewSummary *sqlx.Stmt
}
func NewPostgresStore(url string) (*PostgresStore, error) {
store := &PostgresStore{}
db, err := sqlx.Connect("postgres", url)
if err != nil {
return nil, fmt.Errorf("connection: %v", err)
}
// statements for user store
store.getUser, err = db.Preparex(`
SELECT *
FROM users
WHERE id = $1`)
if err != nil {
return nil, fmt.Errorf("sql get user: %v", err)
}
store.getAllUser, err = db.Preparex(`
SELECT
users.*,
COUNT(reviews.*) as ratings,
COUNT(NULLIF(reviews.description, '')) as reviews
FROM users
LEFT JOIN reviews ON users.id = reviews.user_id
GROUP BY users.id
ORDER BY name`)
if err != nil {
return nil, fmt.Errorf("sql get all user: %v", err)
}
store.insertUser, err = db.PrepareNamed(`
INSERT
INTO users (
auth0,
name,
email,
picture)
VALUES (
:auth0,
:name,
:email,
:picture)
ON CONFLICT (auth0) DO
UPDATE SET
name = :name,
email = :email,
picture = :picture
RETURNING *`)
if err != nil {
return nil, fmt.Errorf("sql insert user: %v", err)
}
// statements for whisky store
store.getWhisky, err = db.Preparex(`
SELECT *
FROM whiskies
WHERE id = $1`)
if err != nil {
return nil, fmt.Errorf("sql get whisky: %v", err)
}
store.getAllWhisky, err = db.Preparex(`
SELECT *
FROM whiskies
ORDER BY distillery, name, age`)
if err != nil {
return nil, fmt.Errorf("sql get all whisky: %v", err)
}
store.getTrendingWhisky, err = db.Preparex(`
SELECT *
FROM whiskies
ORDER BY id DESC
LIMIT $1`)
if err != nil {
return nil, fmt.Errorf("sql get trending whisky: %v", err)
}
store.insertWhisky, err = db.PrepareNamed(`
INSERT
INTO whiskies (type, distillery, name, age, abv, description, picture, thumbnail)
VALUES (:type, :distillery, :name, :age, :abv, :description, :picture, :thumbnail)
RETURNING id`)
if err != nil {
return nil, fmt.Errorf("sql insert whisky: %v", err)
}
store.updateWhisky, err = db.PrepareNamed(`
UPDATE whiskies
SET type = :type, distillery = :distillery, name = :name,
age = :age, abv = :abv, description = :description,
picture = :picture, thumbnail = :thumbnail
WHERE id = :id`)
if err != nil {
return nil, fmt.Errorf("sql update whisky: %v", err)
}
// statements for review store
store.getReview, err = db.Preparex(`
SELECT *
FROM reviews
WHERE id = $1`)
if err != nil {
return nil, fmt.Errorf("sql get review: %v", err)
}
store.getAllReview, err = db.Preparex(`
SELECT *
FROM reviews
WHERE whisky_id = $1
ORDER BY date DESC
LIMIT $2`)
if err != nil {
return nil, fmt.Errorf("sql get all review: %v", err)
}
store.getActivity, err = db.Preparex(`
SELECT *
FROM reviews
ORDER BY date DESC
LIMIT $1`)
if err != nil {
return nil, fmt.Errorf("sql get all review: %v", err)
}
store.insertReview, err = db.PrepareNamed(`
INSERT
INTO reviews (user_id, whisky_id, rating, description)
VALUES (:user_id, :whisky_id, :rating, :description)
RETURNING id`)
if err != nil {
return nil, fmt.Errorf("sql insert review: %v", err)
}
store.updateReview, err = db.PrepareNamed(`
UPDATE reviews
SET rating = :rating, description = :description
WHERE id = :id`)
if err != nil {
return nil, fmt.Errorf("sql update review: %v", err)
}
store.updateReviewSummary, err = db.Preparex(`
WITH tmp AS (SELECT
COALESCE(AVG(rating), 0) as rating,
COUNT(*) as ratings,
COUNT(NULLIF(description, '')) as reviews
FROM reviews
WHERE whisky_id = $1)
UPDATE whiskies
SET rating = tmp.rating, ratings = tmp.ratings, reviews = tmp.reviews
FROM tmp
WHERE id = $1`)
if err != nil {
return nil, fmt.Errorf("sql update review summary: %v", err)
}
return store, nil
}
// ---------------------------------------------------
// User Store
// ---------------------------------------------------
func (store PostgresStore) GetUser(id int) (User, error) {
user := User{}
err := store.getUser.Get(&user, id)
return user, err
}
func (store PostgresStore) GetAllUser() ([]User, error) {
users := []User{}
err := store.getAllUser.Select(&users)
return users, err
}
func (store PostgresStore) SaveUser(entity User) (User, error) {
err := store.insertUser.Get(&entity, entity)
return entity, err
}
// ---------------------------------------------------
// Whisky Store
// ---------------------------------------------------
func (store PostgresStore) GetWhisky(id int) (Whisky, error) {
whisky := Whisky{}
err := store.getWhisky.Get(&whisky, id)
return whisky, err
}
func (store PostgresStore) GetAllWhiskies() ([]Whisky, error) {
whiskies := []Whisky{}
err := store.getAllWhisky.Select(&whiskies)
return whiskies, err
}
func (store PostgresStore) GetTrending(limit int) ([]Whisky, error) {
whiskies := []Whisky{}
err := store.getTrendingWhisky.Select(&whiskies, limit)
return whiskies, err
}
func (store PostgresStore) SaveWhisky(entity Whisky) (Whisky, error) {
if entity.ID != 0 {
_, err := store.updateWhisky.Exec(entity)
return entity, err
} else {
err := store.insertWhisky.Get(&entity, entity)
return entity, err
}
}
// ---------------------------------------------------
// Review Store
// ---------------------------------------------------
func (store PostgresStore) joinReview(review Review) (Review, error) {
review.Whisky = &Whisky{}
if err := store.getWhisky.Get(review.Whisky, review.WhiskyID); err != nil {
return review, err
}
review.User = &User{}
if err := store.getUser.Get(review.User, review.UserID); err != nil {
return review, err
}
return review, nil
}
func (store PostgresStore) GetReview(id int) (Review, error) {
review := Review{}
err := store.getReview.Get(&review, id)
if err != nil {
return review, err
}
return store.joinReview(review)
}
func (store PostgresStore) GetAllReviews(whiskyid int, limit int) ([]Review, error) {
reviews := []Review{}
err := store.getAllReview.Select(&reviews, whiskyid, limit)
if err != nil {
return reviews, err
}
for i, review := range reviews {
reviews[i], err = store.joinReview(review)
if err != nil {
return reviews, err
}
}
return reviews, nil
}
func (store PostgresStore) GetActivity(userid int, limit int) ([]Review, error) {
reviews := []Review{}
err := store.getActivity.Select(&reviews, limit)
if err != nil {
return reviews, err
}
for i, review := range reviews {
reviews[i], err = store.joinReview(review)
if err != nil {
return reviews, err
}
}
return reviews, nil
}
func (store PostgresStore) SaveReview(entity Review) (Review, error) {
if entity.ID != 0 {
if _, err := store.updateReview.Exec(entity); err != nil {
return entity, err
}
} else {
if err := store.insertReview.Get(&entity, entity); err != nil {
return entity, err
}
}
if _, err := store.updateReviewSummary.Exec(entity.WhiskyID); err != nil {
return entity, err
}
return store.joinReview(entity)
}
var (
_ UserStore = (*PostgresStore)(nil)
_ WhiskyStore = (*PostgresStore)(nil)
_ ReviewStore = (*PostgresStore)(nil)
)