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vertica.go
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vertica.go
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// Package vertica defines and registers usql's Vertica driver.
//
// See: https://github.com/vertica/vertica-sql-go
package vertica
import (
"context"
"crypto/tls"
"crypto/x509"
"database/sql"
"fmt"
"io"
"net/url"
"os"
"regexp"
"strings"
vertigo "github.com/vertica/vertica-sql-go" // DRIVER
"github.com/vertica/vertica-sql-go/logger"
"github.com/xo/dburl"
"github.com/xo/usql/drivers"
)
func init() {
// List of custom TLS configurations that may be applied via query in connection string.
customTlsConfig := map[string]func(string, *tls.Config) error{
"ca_path": func(queryValue string, c *tls.Config) error {
rootCertPool := x509.NewCertPool()
pem, err := os.ReadFile(queryValue)
if err != nil {
return err
}
if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
return fmt.Errorf("error: failed to append pem to cert pool")
}
c.RootCAs = rootCertPool
return nil
},
}
hasCustomTlsConfig := func(queries url.Values) bool {
for key := range customTlsConfig {
if queries.Has(key) {
return true
}
}
return false
}
applyCustomTlsConfig := func(queries url.Values, tlsConfig *tls.Config) error {
for key, configFunction := range customTlsConfig {
if queries.Has(key) {
if err := configFunction(queries.Get(key), tlsConfig); err != nil {
return err
}
}
}
return nil
}
// turn off logging
if os.Getenv("VERTICA_SQL_GO_LOG_LEVEL") == "" {
logger.SetLogLevel(logger.NONE)
}
errCodeRE := regexp.MustCompile(`(?i)^\[([0-9a-z]+)\]\s+(.+)`)
drivers.Register("vertica", drivers.Driver{
AllowDollar: true,
AllowMultilineComments: true,
Version: func(ctx context.Context, db drivers.DB) (string, error) {
var ver string
if err := db.QueryRowContext(ctx, `SELECT version()`).Scan(&ver); err != nil {
return "", err
}
return ver, nil
},
Open: func(_ context.Context, u *dburl.URL, stdout, stderr func() io.Writer) (func(string, string) (*sql.DB, error), error) {
return func(_, _ string) (*sql.DB, error) {
queries := u.Query()
if hasCustomTlsConfig(queries) {
if queries.Get("tlsmode") != "server-strict" {
configNames := []string{}
for key := range customTlsConfig {
configNames = append(configNames, key)
}
return nil, fmt.Errorf(fmt.Sprintf("error: when custom tls configurations are set (%s), tlsmode must be set to server-strict", strings.Join(configNames, ",")))
}
tlsConfig := &tls.Config{ServerName: u.Hostname()}
if err := applyCustomTlsConfig(queries, tlsConfig); err != nil {
return nil, err
}
if err := vertigo.RegisterTLSConfig("custom_tls_config", tlsConfig); err != nil {
return nil, err
}
queries.Set("tlsmode", "custom_tls_config")
}
dsn := url.URL{
Scheme: u.Driver,
User: u.User,
Host: u.Host,
Path: u.Path,
RawQuery: queries.Encode(),
}
return sql.Open(u.Driver, dsn.String())
}, nil
},
ChangePassword: func(db drivers.DB, user, newpw, _ string) error {
_, err := db.Exec(`ALTER USER ` + user + ` IDENTIFIED BY '` + newpw + `'`)
return err
},
Err: func(err error) (string, string) {
msg := strings.TrimSpace(strings.TrimPrefix(err.Error(), "Error:"))
if m := errCodeRE.FindAllStringSubmatch(msg, -1); m != nil {
return m[0][1], strings.TrimSpace(m[0][2])
}
return "", msg
},
IsPasswordErr: func(err error) bool {
return strings.HasSuffix(strings.TrimSpace(err.Error()), "Invalid username or password")
},
})
}