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connection.go
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connection.go
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/*
* Copyright 2017 XLAB d.o.o.
*
* 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 compat
import (
"github.com/emmyzkp/emmy/anauth"
"google.golang.org/grpc"
)
// ConnectionConfig wraps client.ConnectionConfig that holds connection information.
// Clients need to provide these information in order to establish connection to the server.
// For more details see documentation for the github.com/emmyzkp/emmy/client package.
type ConnectionConfig struct {
Endpoint string // Server's Endpoint
ServerNameOverride string
CACertificate []byte
TimeoutMillis int
}
// NewConnectionConfig constructs an instance of ConnectionConfig based on the provided server
// endpoint, serverNameOverride and CA certificate.
func NewConnectionConfig(endpoint, serverNameOverride string,
certificate []byte, timeout int) *ConnectionConfig {
return &ConnectionConfig{
endpoint,
serverNameOverride,
certificate,
timeout,
}
}
// Connection wraps *grpc.ClientConn. A Connection should be constructed independently and then
// passed as an argument to protocol clients. Same Connection can be re-used for many clients.
type Connection struct {
*grpc.ClientConn
}
// NewConnection accepts *ConnectionConfig and uses the provided configuration information to
// establish connection to the server.
func NewConnection(cfg *ConnectionConfig) (*Connection, error) {
conn, err := anauth.GetConnection(cfg.Endpoint, []anauth.ConnOption{
anauth.WithCACert(cfg.CACertificate),
anauth.WithServerNameOverride(cfg.ServerNameOverride),
anauth.WithTimeout(cfg.TimeoutMillis)}...)
if err != nil {
return nil, err
}
return &Connection{conn}, err
}
// Close attempts to close connection to the server.
func (c *Connection) Close() error {
if err := c.ClientConn.Close(); err != nil {
return err
}
return nil
}