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run.go
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run.go
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package main
import (
"flag"
"fmt"
"net/url"
"os"
"strings"
)
var (
verbose bool
queue string
)
func setupFlags() {
flag.BoolVar(&verbose, "v", false, "Turn on debugging messages")
flag.StringVar(&queue, "q", "", "Queue name")
flag.Parse()
}
// Print command line usage
// Docker host address should have format like 172.17.0.1:2375 for tcp or /var/run/docker.sock for socket
// Rabbit queue address should be like amqp://guest:guest@localhost:5672/
func usage() {
fmt.Println("Usage: docker-dispatch [OPTIONS] DOCKERHOST AMQPADDR\n")
fmt.Println("Dispatch docker containers from commands passed through queue\n")
fmt.Println("DOCKERHOST - ip:port tcp address or a unix socket path. Examples: 172.17.0.1:2375 or /var/run/docker.sock")
fmt.Println("AMQPADDR - full RabbitMQ uri. Example: amqp://guest:guest@localhost:5672\n")
fmt.Println("Options:")
fmt.Println(" -q, queue name")
fmt.Println(" -v, verbose")
}
func checkURL(urlStr string) (*url.URL, error) {
u, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
if strings.Compare(u.Scheme, "unix") != 0 && strings.Compare(u.Scheme, "http") != 0 && strings.Compare(u.Scheme, "https") != 0 {
fmt.Printf("Scheme is %v\n", u.Scheme)
return nil, fmt.Errorf("Scheme must be unix ie. unix:///var/run/daemon/sock:/path or http")
}
return u, nil
}
func checkArgs(args []string) {
if len(args) != 2 {
usage()
os.Exit(1)
}
}
func main() {
// Parse command line arguments
setupFlags()
args := flag.Args()
checkArgs(args)
dockerAddr := args[0]
queueAddr := args[1]
// Create queue reader
qreader, err := NewQueueReader(queueAddr)
FailOnError(err, fmt.Sprintf("Error connecting to queue at %s\n", queueAddr))
queueOutput, err := qreader.Consume(queue)
FailOnError(err, fmt.Sprintf("Error reading from queue '%s'\n", queue))
fmt.Printf("Connected to queue \"%s\" at %s\n", queue, queueAddr)
// Create message parser
parserOutput := NewMessageParser(queueOutput)
// Create dispatcher
dispatcher := NewDispatcher(dockerAddr, parserOutput)
dispOutput := dispatcher.Start()
fmt.Printf("Connected to docker at %s\n", dockerAddr)
// Output results data
for r := range dispOutput {
fmt.Printf("%-20s | %v", r.Name, r.Data)
}
}