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haproxy.go
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haproxy.go
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// Copyright 2017 The Cockroach Authors.
//
// 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.
//
// Author: Marc Berhault (marc@cockroachlabs.com)
package cli
import (
"html/template"
"io"
"os"
"github.com/cockroachdb/cockroach/pkg/server/serverpb"
"github.com/spf13/cobra"
)
var haProxyPath string
var genHAProxyCmd = &cobra.Command{
Use: "haproxy",
Short: "generate haproxy.cfg for the connected cluster",
Long: `This command generates a minimal haproxy configuration file for the cluster
reached through the client flags.
The file is written to --out. Use "--out -" for stdout.
The addresses used are those advertized by the nodes themselves. Make sure haproxy
can resolve the hostnames in the configuration file, either by using full-qualified names, or
running haproxy in the same network.
`,
RunE: MaybeDecorateGRPCError(runGenHAProxyCmd),
}
func runGenHAProxyCmd(cmd *cobra.Command, args []string) error {
if len(args) > 0 {
return usageAndError(cmd)
}
configTemplate, err := template.New("haproxy template").Parse(haProxyTemplate)
if err != nil {
return err
}
c, stopper, err := getStatusClient()
if err != nil {
return err
}
defer stopper.Stop(stopperContext(stopper))
nodeStatuses, err := c.Nodes(stopperContext(stopper), &serverpb.NodesRequest{})
if err != nil {
return err
}
var w io.Writer
var f *os.File
if haProxyPath == "-" {
w = os.Stdout
} else if f, err = os.OpenFile(haProxyPath, os.O_RDWR|os.O_CREATE, 0755); err != nil {
return err
} else {
w = f
}
err = configTemplate.Execute(w, nodeStatuses.Nodes)
if err != nil {
// Return earliest error, but still close the file.
_ = f.Close()
return err
}
if f != nil {
return f.Close()
}
return nil
}
const haProxyTemplate = `
global
maxconn 4096
defaults
mode tcp
timeout connect 10s
timeout client 1m
timeout server 1m
listen psql
bind :26257
mode tcp
balance roundrobin
{{range .}} server cockroach{{.Desc.NodeID}} {{.Desc.Address.AddressField}} check
{{end}}
`