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client.go
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client.go
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// Copyright 2020 The Kanister Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package postgres
import (
"context"
"database/sql"
"fmt"
// Initialize pq driver
_ "github.com/lib/pq"
)
// Client is postgres client to access postgres instance
type Client struct {
*sql.DB
}
// NewClient initializes postgres client
func NewClient(host, username, password, database, sslMode string) (*Client, error) {
connectionString := fmt.Sprintf("host=%s user=%s password=%s dbname=%s sslmode=%s", host, username, password, database, sslMode)
db, err := sql.Open("postgres", connectionString)
if err != nil {
return nil, err
}
return &Client{db}, nil
}
// PingDB tests db connection
func (pg Client) PingDB(ctx context.Context) error {
return pg.Ping()
}
// ListDatabases returns list of databases in postgres
func (pg Client) ListDatabases(ctx context.Context) ([]string, error) {
stmt := "SELECT datname FROM pg_database;"
rows, err := pg.QueryContext(ctx, stmt)
if err != nil {
return nil, err
}
var dbList []string
for rows.Next() {
var db string
err = rows.Scan(&db)
if err != nil {
break
}
dbList = append(dbList, db)
}
return dbList, nil
}