84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
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//
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// Copyright (c) 2019
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// Mainflux
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package postgres
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import (
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"fmt"
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"github.com/jmoiron/sqlx"
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_ "github.com/lib/pq" // required for SQL access
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migrate "github.com/rubenv/sql-migrate"
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)
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// Config defines the options that are used when connecting to a PostgreSQL instance
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type Config struct {
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Host string
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Port string
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User string
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Pass string
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Name string
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SSLMode string
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SSLCert string
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SSLKey string
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SSLRootCert string
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}
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// Connect creates a connection to the PostgreSQL instance and applies any
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// unapplied database migrations. A non-nil error is returned to indicate
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// failure.
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func Connect(cfg Config) (*sqlx.DB, error) {
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url := fmt.Sprintf("host=%s port=%s user=%s dbname=%s password=%s sslmode=%s sslcert=%s sslkey=%s sslrootcert=%s", cfg.Host, cfg.Port, cfg.User, cfg.Name, cfg.Pass, cfg.SSLMode, cfg.SSLCert, cfg.SSLKey, cfg.SSLRootCert)
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db, err := sqlx.Open("postgres", url)
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if err != nil {
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return nil, err
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}
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if err := migrateDB(db); err != nil {
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return nil, err
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}
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return db, nil
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}
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func migrateDB(db *sqlx.DB) error {
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migrations := &migrate.MemoryMigrationSource{
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Migrations: []*migrate.Migration{
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{
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Id: "messages_1",
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Up: []string{
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`CREATE TABLE IF NOT EXISTS messages (
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id UUID,
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channel UUID,
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subtopic VARCHAR(254),
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publisher UUID,
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protocol TEXT,
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name TEXT,
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unit TEXT,
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value FLOAT,
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string_value TEXT,
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bool_value BOOL,
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data_value TEXT,
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value_sum FLOAT,
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time FlOAT,
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update_time FLOAT,
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link TEXT,
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PRIMARY KEY (id)
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)`,
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},
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Down: []string{
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"DROP TABLE messages",
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},
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},
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},
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}
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_, err := migrate.Exec(db.DB, "postgres", migrations, migrate.Up)
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return err
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}
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