/
postgres.go
163 lines (136 loc) · 4.98 KB
/
postgres.go
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package postgres
import (
"database/sql"
"fmt"
"strconv"
"strings"
"github.com/grafana/grafana/pkg/setting"
"github.com/grafana/grafana/pkg/util/errutil"
"github.com/grafana/grafana/pkg/infra/log"
"github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/tsdb"
"github.com/grafana/grafana/pkg/tsdb/sqleng"
"xorm.io/core"
)
func init() {
tsdb.RegisterTsdbQueryEndpoint("postgres", newPostgresQueryEndpoint)
}
func newPostgresQueryEndpoint(datasource *models.DataSource) (tsdb.TsdbQueryEndpoint, error) {
logger := log.New("tsdb.postgres")
logger.Debug("Creating Postgres query endpoint")
cnnstr, err := generateConnectionString(datasource, logger)
if err != nil {
return nil, err
}
if setting.Env == setting.DEV {
logger.Debug("getEngine", "connection", cnnstr)
}
config := sqleng.SqlQueryEndpointConfiguration{
DriverName: "postgres",
ConnectionString: cnnstr,
Datasource: datasource,
MetricColumnTypes: []string{"UNKNOWN", "TEXT", "VARCHAR", "CHAR"},
}
queryResultTransformer := postgresQueryResultTransformer{
log: logger,
}
timescaledb := datasource.JsonData.Get("timescaledb").MustBool(false)
endpoint, err := sqleng.NewSqlQueryEndpoint(&config, &queryResultTransformer, newPostgresMacroEngine(timescaledb), logger)
if err != nil {
logger.Debug("Failed connecting to Postgres", "err", err)
return nil, err
}
logger.Debug("Successfully connected to Postgres")
return endpoint, err
}
// escape single quotes and backslashes in Postgres connection string parameters.
func escape(input string) string {
return strings.Replace(strings.Replace(input, `\`, `\\`, -1), "'", `\'`, -1)
}
func generateConnectionString(datasource *models.DataSource, logger log.Logger) (string, error) {
sslMode := strings.TrimSpace(strings.ToLower(datasource.JsonData.Get("sslmode").MustString("verify-full")))
isSSLDisabled := sslMode == "disable"
var host string
var port int
if strings.HasPrefix(datasource.Url, "/") {
host = datasource.Url
logger.Debug("Generating connection string with Unix socket specifier", "socket", host)
} else {
sp := strings.SplitN(datasource.Url, ":", 2)
host = sp[0]
if len(sp) > 1 {
var err error
port, err = strconv.Atoi(sp[1])
if err != nil {
return "", errutil.Wrapf(err, "invalid port in host specifier %q", sp[1])
}
logger.Debug("Generating connection string with network host/port pair", "host", host, "port", port)
} else {
logger.Debug("Generating connection string with network host", "host", host)
}
}
connStr := fmt.Sprintf("user='%s' password='%s' host='%s' dbname='%s' sslmode='%s'",
escape(datasource.User), escape(datasource.DecryptedPassword()), escape(host), escape(datasource.Database),
escape(sslMode))
if port > 0 {
connStr += fmt.Sprintf(" port=%d", port)
}
if isSSLDisabled {
logger.Debug("Postgres SSL is disabled")
} else {
logger.Debug("Postgres SSL is enabled", "sslMode", sslMode)
// Attach root certificate if provided
if sslRootCert := datasource.JsonData.Get("sslRootCertFile").MustString(""); sslRootCert != "" {
logger.Debug("Setting server root certificate", "sslRootCert", sslRootCert)
connStr += fmt.Sprintf(" sslrootcert='%s'", sslRootCert)
}
// Attach client certificate and key if both are provided
sslCert := datasource.JsonData.Get("sslCertFile").MustString("")
sslKey := datasource.JsonData.Get("sslKeyFile").MustString("")
if sslCert != "" && sslKey != "" {
logger.Debug("Setting SSL client auth", "sslCert", sslCert, "sslKey", sslKey)
connStr += fmt.Sprintf(" sslcert='%s' sslkey='%s'", sslCert, sslKey)
} else if sslCert != "" || sslKey != "" {
return "", fmt.Errorf("SSL client certificate and key must both be specified")
}
}
logger.Debug("Generated Postgres connection string successfully")
return connStr, nil
}
type postgresQueryResultTransformer struct {
log log.Logger
}
func (t *postgresQueryResultTransformer) TransformQueryResult(columnTypes []*sql.ColumnType, rows *core.Rows) (tsdb.RowValues, error) {
values := make([]interface{}, len(columnTypes))
valuePtrs := make([]interface{}, len(columnTypes))
for i := 0; i < len(columnTypes); i++ {
valuePtrs[i] = &values[i]
}
if err := rows.Scan(valuePtrs...); err != nil {
return nil, err
}
// convert types not handled by lib/pq
// unhandled types are returned as []byte
for i := 0; i < len(columnTypes); i++ {
if value, ok := values[i].([]byte); ok {
switch columnTypes[i].DatabaseTypeName() {
case "NUMERIC":
if v, err := strconv.ParseFloat(string(value), 64); err == nil {
values[i] = v
} else {
t.log.Debug("Rows", "Error converting numeric to float", value)
}
case "UNKNOWN", "CIDR", "INET", "MACADDR":
// char literals have type UNKNOWN
values[i] = string(value)
default:
t.log.Debug("Rows", "Unknown database type", columnTypes[i].DatabaseTypeName(), "value", value)
values[i] = string(value)
}
}
}
return values, nil
}
func (t *postgresQueryResultTransformer) TransformQueryError(err error) error {
return err
}