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driver.go
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driver.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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 avatica provides an Apache Phoenix Query Server/Avatica driver for Go's database/sql package.
# Quickstart
Import the database/sql package along with the avatica driver.
import "database/sql"
import _ "github.com/apache/calcite-avatica-go/v5"
db, err := sql.Open("avatica", "http://phoenix-query-server:8765")
See https://calcite.apache.org/avatica/docs/go_client_reference.html for more details
*/
package avatica
import (
"context"
"database/sql"
"database/sql/driver"
"fmt"
"net/http"
"github.com/apache/calcite-avatica-go/v5/generic"
"github.com/apache/calcite-avatica-go/v5/hsqldb"
"github.com/apache/calcite-avatica-go/v5/message"
"github.com/apache/calcite-avatica-go/v5/phoenix"
"github.com/google/uuid"
)
// Driver is exported to allow it to be used directly.
type Driver struct{}
// Connector implements the driver.Connector interface
type Connector struct {
Info map[string]string
Client *http.Client
dsn string
}
// NewConnector creates a new connector
func NewConnector(dsn string) driver.Connector {
return &Connector{
Info: make(map[string]string),
dsn: dsn,
}
}
func (c *Connector) Connect(context.Context) (driver.Conn, error) {
config, err := ParseDSN(c.dsn)
if err != nil {
return nil, fmt.Errorf("unable to open connection: %w", err)
}
// propagate user and password to connector info so that it's available in JDBC context for example
if config.avaticaUser != "" {
c.Info["user"] = config.avaticaUser
}
if config.avaticaPassword != "" {
c.Info["password"] = config.avaticaPassword
}
connectionId, err := uuid.NewRandom()
if err != nil {
return nil, fmt.Errorf("error generating connection id: %w", err)
}
httpClient, err := NewHTTPClient(config.endpoint, c.Client, config)
if err != nil {
return nil, fmt.Errorf("unable to create HTTP client: %w", err)
}
conn := &conn{
connectionId: connectionId.String(),
httpClient: httpClient,
config: config,
connectorInfo: c.Info,
}
err = registerConn(conn)
if err != nil {
return nil, err
}
response, err := conn.httpClient.post(context.Background(), &message.DatabasePropertyRequest{
ConnectionId: conn.connectionId,
})
if err != nil {
return nil, conn.avaticaErrorToResponseErrorOrError(err)
}
databasePropertyResponse := response.(*message.DatabasePropertyResponse)
adapter := ""
for _, property := range databasePropertyResponse.Props {
if property.Key.Name == "GET_DRIVER_NAME" {
adapter = property.Value.StringValue
}
}
conn.adapter = getAdapter(adapter)
return conn, nil
}
func registerConn(conn *conn) error {
info := map[string]string{
"AutoCommit": "true",
"Consistency": "8",
}
for k, v := range conn.connectorInfo {
info[k] = v
}
// Open a connection to the server
req := &message.OpenConnectionRequest{
ConnectionId: conn.connectionId,
Info: info,
}
if conn.config.schema != "" {
req.Info["schema"] = conn.config.schema
}
_, err := conn.httpClient.post(context.Background(), req)
if err != nil {
return conn.avaticaErrorToResponseErrorOrError(err)
}
return nil
}
// Driver returns the underlying driver
func (c *Connector) Driver() driver.Driver {
return &Driver{}
}
// Open a Connection to the server.
// See https://github.com/apache/calcite-avatica-go#dsn for more information
// on how the DSN is formatted.
func (a *Driver) Open(dsn string) (driver.Conn, error) {
return NewConnector(dsn).Connect(context.TODO())
}
func getAdapter(e string) Adapter {
switch e {
case "HSQL Database Engine Driver":
return hsqldb.Adapter{}
case "PhoenixEmbeddedDriver":
return phoenix.Adapter{}
default:
return generic.Adapter{}
}
}
func init() {
sql.Register("avatica", &Driver{})
}