forked from driskell/log-courier
/
v1client.go
156 lines (123 loc) · 3.4 KB
/
v1client.go
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/*
* Copyright 2014-2015 Jason Woods.
*
* 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 admin
import (
"encoding/gob"
"fmt"
"net"
"time"
"github.com/driskell/log-courier/lc-lib/core"
)
// V1Client is a client compatible with Log Courier 1.x
type V1Client struct {
adminConnect string
conn net.Conn
decoder *gob.Decoder
}
// NewV1Client returns a new admin client compatible with Log Courier 1.x
func NewV1Client(adminConnect string) (*V1Client, error) {
var err error
ret := &V1Client{}
if ret.conn, err = ret.connect(adminConnect); err != nil {
return nil, err
}
ret.decoder = gob.NewDecoder(ret.conn)
return ret, nil
}
func (c *V1Client) connect(adminConnect string) (net.Conn, error) {
connect := splitAdminConnectString(adminConnect)
if dialer, ok := registeredDialers[connect[0]]; ok {
dialerStruct, err := dialer(connect[0], connect[1])
if err != nil {
return nil, err
}
return dialerStruct.Dial(connect[0], connect[1])
}
return nil, fmt.Errorf("Unknown transport specified in connection address: '%s'", connect[0])
}
func (c *V1Client) request(command string) (*Response, error) {
if err := c.conn.SetWriteDeadline(time.Now().Add(5 * time.Second)); err != nil {
return nil, err
}
totalWritten := 0
for {
wrote, err := c.conn.Write([]byte(command[totalWritten:4]))
if err != nil {
return nil, err
}
totalWritten += wrote
if totalWritten == 4 {
break
}
}
var response Response
if err := c.conn.SetReadDeadline(time.Now().Add(5 * time.Second)); err != nil {
return nil, err
}
if err := c.decoder.Decode(&response); err != nil {
return nil, err
}
return &response, nil
}
func (c *V1Client) resolveError(response *Response) error {
ret, ok := response.Response.(*ErrorResponse)
if ok {
return ret
}
return &ErrorResponse{Message: fmt.Sprintf("Unrecognised response: %v\n", ret)}
}
// Ping sends a PING command to test the admin connection
func (c *V1Client) Ping() error {
response, err := c.request("PING")
if err != nil {
return err
}
if _, ok := response.Response.(*PongResponse); ok {
return nil
}
return c.resolveError(response)
}
// Reload requests the connected Log Courier to reload its configuration
func (c *V1Client) Reload() error {
response, err := c.request("RELD")
if err != nil {
return err
}
if _, ok := response.Response.(*ReloadResponse); ok {
return nil
}
return c.resolveError(response)
}
// FetchSnapshot requests a status snapshot from Log Courier
func (c *V1Client) FetchSnapshot() (*core.Snapshot, error) {
response, err := c.request("SNAP")
if err != nil {
return nil, err
}
if ret, ok := response.Response.(*core.Snapshot); ok {
return ret, nil
}
// Backwards compatibility
if ret, ok := response.Response.([]*core.Snapshot); ok {
snap := core.NewSnapshot("Log Courier")
for _, sub := range ret {
snap.AddSub(sub)
}
snap.Sort()
return snap, nil
}
return nil, c.resolveError(response)
}