使用 Go 的 database/sql 软件包为与 Cloud SQL for PostgreSQL 的 TCP 连接配置 SSL(安全套接字层)证书。
代码示例
Go
package cloudsql
import (
"database/sql"
"fmt"
"log"
"os"
// Note: If connecting using the App Engine Flex Go runtime, use
// "github.com/jackc/pgx/stdlib" instead, since v4 requires
// Go modules which are not supported by App Engine Flex.
_ "github.com/jackc/pgx/v4/stdlib"
)
// connectTCPSocket initializes a TCP connection pool for a Cloud SQL
// instance of Postgres.
func connectTCPSocket() (*sql.DB, error) {
mustGetenv := func(k string) string {
v := os.Getenv(k)
if v == "" {
log.Fatalf("Warning: %s environment variable not set.", k)
}
return v
}
// Note: Saving credentials in environment variables is convenient, but not
// secure - consider a more secure solution such as
// Cloud Secret Manager (https://cloud.google.com/secret-manager) to help
// keep secrets safe.
var (
dbUser = mustGetenv("DB_USER") // e.g. 'my-db-user'
dbPwd = mustGetenv("DB_PASS") // e.g. 'my-db-password'
dbTCPHost = mustGetenv("INSTANCE_HOST") // e.g. '127.0.0.1' ('172.17.0.1' if deployed to GAE Flex)
dbPort = mustGetenv("DB_PORT") // e.g. '5432'
dbName = mustGetenv("DB_NAME") // e.g. 'my-database'
)
dbURI := fmt.Sprintf("host=%s user=%s password=%s port=%s database=%s",
dbTCPHost, dbUser, dbPwd, dbPort, dbName)
// (OPTIONAL) Configure SSL certificates
// For deployments that connect directly to a Cloud SQL instance without
// using the Cloud SQL Proxy, configuring SSL certificates will ensure the
// connection is encrypted.
if dbRootCert, ok := os.LookupEnv("DB_ROOT_CERT"); ok { // e.g., '/path/to/my/server-ca.pem'
var (
dbCert = mustGetenv("DB_CERT") // e.g. '/path/to/my/client-cert.pem'
dbKey = mustGetenv("DB_KEY") // e.g. '/path/to/my/client-key.pem'
)
dbURI += fmt.Sprintf(" sslmode=require sslrootcert=%s sslcert=%s sslkey=%s",
dbRootCert, dbCert, dbKey)
}
// dbPool is the pool of database connections.
dbPool, err := sql.Open("pgx", dbURI)
if err != nil {
return nil, fmt.Errorf("sql.Open: %v", err)
}
// ...
return dbPool, nil
}
后续步骤
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