github.com/uber/kraken@v0.1.4/tools/bin/reload/main.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package main
    15  
    16  import (
    17  	"bytes"
    18  	"encoding/json"
    19  	"flag"
    20  	"fmt"
    21  	"os"
    22  	"strings"
    23  	"sync"
    24  	"time"
    25  
    26  	"github.com/uber/kraken/lib/torrent/scheduler"
    27  	"github.com/uber/kraken/utils/configutil"
    28  	"github.com/uber/kraken/utils/httputil"
    29  	"github.com/uber/kraken/utils/osutil"
    30  )
    31  
    32  type appConfig struct {
    33  	Scheduler scheduler.Config `yaml:"scheduler"`
    34  }
    35  
    36  func reload(addr string, config scheduler.Config) error {
    37  	b, err := json.Marshal(config)
    38  	if err != nil {
    39  		return err
    40  	}
    41  	_, err = httputil.Patch(
    42  		fmt.Sprintf("http://%s/x/config/scheduler", addr),
    43  		httputil.SendBody(bytes.NewBuffer(b)),
    44  		httputil.SendTimeout(5*time.Second))
    45  	return err
    46  }
    47  
    48  func main() {
    49  	configFile := flag.String("config", "", "config file")
    50  	hostFile := flag.String("f", "", "host file")
    51  	hostStr := flag.String("hosts", "", "comma-separated hosts")
    52  	port := flag.Int("port", 7602, "server port (different for agent / origin)")
    53  	flag.Parse()
    54  
    55  	if *configFile == "" {
    56  		panic("-config required")
    57  	}
    58  	if (*hostFile != "" && *hostStr != "") || (*hostFile == "" && *hostStr == "") {
    59  		panic("must set either -f or -hosts")
    60  	}
    61  	if *port == 0 {
    62  		panic("-port must be non-zero")
    63  	}
    64  
    65  	var hosts []string
    66  	if *hostFile != "" {
    67  		f, err := os.Open(*hostFile)
    68  		if err != nil {
    69  			panic(err)
    70  		}
    71  		hosts, err = osutil.ReadLines(f)
    72  		if err != nil {
    73  			panic(err)
    74  		}
    75  	} else if *hostStr != "" {
    76  		hosts = strings.Split(*hostStr, ",")
    77  	}
    78  
    79  	var config appConfig
    80  	if err := configutil.Load(*configFile, &config); err != nil {
    81  		panic(err)
    82  	}
    83  
    84  	errs := make(chan error)
    85  	var wg sync.WaitGroup
    86  	for _, host := range hosts {
    87  		wg.Add(1)
    88  		go func(host string) {
    89  			defer wg.Done()
    90  			addr := fmt.Sprintf("%s:%d", host, *port)
    91  			if err := reload(addr, config.Scheduler); err != nil {
    92  				errs <- err
    93  			}
    94  		}(host)
    95  	}
    96  	go func() {
    97  		for err := range errs {
    98  			fmt.Println(err)
    99  		}
   100  	}()
   101  	wg.Wait()
   102  	close(errs)
   103  }