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package main
import (
"fmt"
"log"
"net/url"
"strconv"
"strings"
"github.com/jmoiron/sqlx"
"github.com/pressly/goose/v3"
"gorm.io/driver/postgres"
"gorm.io/driver/sqlite"
"gorm.io/gorm"
"gorm.io/gorm/schema"
)
// In order to connect to Postgresql you need to fill out all the fields.
//
// To connect to sqlite, you just need to specify "sqlite" driver.
// By default it will use in-memory database. You can provide CLEARNODE_DATABASE_NAME to use the file.
type DatabaseConfig struct {
URL string `env:"CLEARNODE_DATABASE_URL" env-default:""`
Name string `env:"CLEARNODE_DATABASE_NAME" env-default:""`
Schema string `env:"CLEARNODE_DATABASE_SCHEMA" env-default:""`
Driver string `env:"CLEARNODE_DATABASE_DRIVER" env-default:"postgres"`
Username string `env:"CLEARNODE_DATABASE_USERNAME" env-default:"postgres"`
Password string `env:"CLEARNODE_DATABASE_PASSWORD" env-default:"your-super-secret-and-long-postgres-password"`
Host string `env:"CLEARNODE_DATABASE_HOST" env-default:"localhost"`
Port string `env:"CLEARNODE_DATABASE_PORT" env-default:"5432"`
Retries int `env:"CLEARNODE_DATABASE_RETRIES" env-default:"5"`
}
// ParseConnectionString parses a PostgreSQL URI and returns a DatabaseConfig
func ParseConnectionString(connStr string) (DatabaseConfig, error) {
log.Println("parsing db connection string")
// SQLite detection: starts with "file:"
if strings.HasPrefix(connStr, "file:") {
// Separate path from query
parts := strings.SplitN(connStr[5:], "?", 2)
dbName := parts[0]
return DatabaseConfig{
Name: dbName,
Driver: "sqlite",
Host: "",
Port: "",
Retries: 1,
}, nil
}
// Postgresql parsing
parsedURL, err := url.Parse(connStr)
if err != nil {
return DatabaseConfig{}, fmt.Errorf("invalid connection string: %w", err)
}
if parsedURL.Scheme != "postgres" && parsedURL.Scheme != "postgresql" {
return DatabaseConfig{}, fmt.Errorf("unsupported scheme: %s", parsedURL.Scheme)
}
user := parsedURL.User
username := ""
password := ""
if user != nil {
username = user.Username()
password, _ = user.Password()
}
host := parsedURL.Hostname()
port := parsedURL.Port()
if port == "" {
port = "5432" // default PostgreSQL port
}
dbName := strings.TrimPrefix(parsedURL.Path, "/")
// extract schema if present in query parameters
schema := ""
retries := 5
query := parsedURL.Query()
if s := query.Get("search_path"); s != "" {
schema = s
}
if r := query.Get("retries"); r != "" {
if retryVal, err := strconv.Atoi(r); err == nil {
retries = retryVal
}
}
return DatabaseConfig{
Name: dbName,
Schema: schema,
Driver: "postgres",
Username: username,
Password: password,
Host: host,
Port: port,
Retries: retries,
}, nil
}
func ConnectToDB(cnf DatabaseConfig) (*gorm.DB, error) {
switch cnf.Driver {
case "postgres":
return connectToPostgresql(cnf)
case "sqlite", "":
return connectToSqlite(cnf)
default:
return nil, fmt.Errorf("unsupported driver: %s", cnf.Driver)
}
}
func connectToPostgresql(cnf DatabaseConfig) (*gorm.DB, error) {
log.Println("connecting to Postgresql")
// Create schema if not exists
ensurePostgresqlSchema(cnf)
// Apply migrations
migratePostgres(cnf)
// Connect to db
dsn, err := postgresqlDbUrl(cnf)
if err != nil {
return nil, err
}
dial := postgres.Open(dsn)
db, err := gorm.Open(dial, &gorm.Config{
NamingStrategy: schema.NamingStrategy{
TablePrefix: cnf.Schema + ".", // schema name
}})
if err != nil {
return nil, err
}
return db, nil
}
func connectToSqlite(cnf DatabaseConfig) (*gorm.DB, error) {
var dsn string
if cnf.Name != "" {
log.Println("connecting to sqlite")
dsn = fmt.Sprintf("file:%s?cache=shared", cnf.Name)
} else {
log.Println("connecting to in-memory sqlite")
dsn = "file::memory:?cache=shared"
}
dial := sqlite.Open(dsn)
db, err := gorm.Open(dial, &gorm.Config{
NamingStrategy: schema.NamingStrategy{
TablePrefix: cnf.Schema + ".", // schema name
}})
if err != nil {
return nil, err
}
// Migrate sqlite
migrateSqlite(db)
log.Println("Successfully auto-migrated")
return db, nil
}
func postgresqlDbUrl(cnf DatabaseConfig) (string, error) {
switch cnf.Driver {
case "postgres":
dsn := fmt.Sprintf(
"user=%s password=%s host=%s port=%s dbname=%s sslmode=disable",
cnf.Username, cnf.Password, cnf.Host, cnf.Port, cnf.Name,
)
if cnf.Schema != "" {
dsn = fmt.Sprintf("%s search_path=%s", dsn, cnf.Schema)
}
return dsn, nil
default:
return "", fmt.Errorf("unsupported driver: %s", cnf.Driver)
}
}
func ensurePostgresqlSchema(cnf DatabaseConfig) error {
log.Println("creating schema")
dbConf := cnf
dbConf.Schema = ""
dsn, err := postgresqlDbUrl(dbConf)
if err != nil {
return err
}
db, err := sqlx.Connect(dbConf.Driver, dsn)
if err != nil {
return err
}
queryDbCheck := fmt.Sprintf("SELECT 1 FROM information_schema.schemata WHERE schema_name='%s'", cnf.Schema)
if res, err := db.Exec(queryDbCheck); err != nil {
return fmt.Errorf("error while checking schema existance: %s", err.Error())
} else if rows, err := res.RowsAffected(); err != nil {
return fmt.Errorf("error while checking schema existance: %s", err.Error())
} else if rows > 0 {
log.Printf("Schema already exists: %s\n", cnf.Schema)
return nil
}
if _, err = db.Exec(fmt.Sprintf("CREATE SCHEMA IF NOT EXISTS %s", cnf.Schema)); err != nil {
return fmt.Errorf("error while creating schema: %s", err.Error())
}
log.Printf("Schema created: %s\n", cnf.Schema)
return nil
}
func migratePostgres(cnf DatabaseConfig) error {
dsn, err := postgresqlDbUrl(cnf)
if err != nil {
return err
}
db, err := goose.OpenDBWithDriver(cnf.Driver, dsn)
if err != nil {
return err
}
if cnf.Schema != "" {
switch cnf.Driver {
case "postgres":
if _, err := db.Exec(fmt.Sprintf("SET search_path TO %s", cnf.Schema)); err != nil {
return fmt.Errorf("failed to set search path: %v", err)
}
}
}
log.Println("Applying database migrations")
goose.SetBaseFS(embedMigrations)
if err := goose.Up(db, "config/migrations/"+cnf.Driver); err != nil {
panic(err)
}
log.Println("Applied migrations")
return nil
}
func migrateSqlite(db *gorm.DB) error {
if err := db.AutoMigrate(&Entry{}, &Channel{}, &Asset{}, &AppSession{}, &RPCRecord{}); err != nil {
return err
}
return nil
}