github.com/google/cloudprober@v0.11.3/examples/external/redis_probe.go (about)

     1  // Copyright 2018 Google 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  
    15  /*
    16  Binary redis_probe_once implements an example cloudprober external probe that
    17  puts a key-value in a redis server, retrieves it and reports time taken for
    18  both operations.
    19  
    20  This probe assumes a redis server running on the localhost listening to the
    21  default port, 6379. To run it, run the following commands in its parent
    22  directory.
    23  
    24  # Build external probe
    25  go build ./redis_probe.go
    26  
    27  # Launch cloudprober
    28  cloudprober --config_file=cloudprober.cfg
    29  
    30  You should see the following output on the stdout (and corresponding prometheus
    31  data on http://localhost:9313/metrics)
    32  cloudprober 1519..0 1519583408 labels=ptype=external,probe=redis_probe,dst= success=1 total=1 latency=12143.765
    33  cloudprober 1519..1 1519583408 labels=ptype=external,probe=redis_probe,dst= set_latency_ms=0.516 get_latency_ms=0.491
    34  cloudprober 1519..2 1519583410 labels=ptype=external,probe=redis_probe,dst= success=2 total=2 latency=30585.915
    35  cloudprober 1519..3 1519583410 labels=ptype=external,probe=redis_probe,dst= set_latency_ms=0.636 get_latency_ms=0.994
    36  cloudprober 1519..4 1519583412 labels=ptype=external,probe=redis_probe,dst= success=3 total=3 latency=42621.871
    37  
    38  You can also run this probe in server mode by providing "--server" command line
    39  flag.
    40  */
    41  package main
    42  
    43  import (
    44  	"flag"
    45  	"fmt"
    46  	"log"
    47  	"strings"
    48  	"time"
    49  
    50  	"github.com/golang/protobuf/proto"
    51  	epb "github.com/google/cloudprober/probes/external/proto"
    52  	"github.com/google/cloudprober/probes/external/serverutils"
    53  	"github.com/hoisie/redis"
    54  )
    55  
    56  var server = flag.Bool("server", false, "Whether to run in server mode")
    57  
    58  func probe() (string, error) {
    59  	var payload []string
    60  	var client redis.Client
    61  
    62  	// Measure set latency
    63  	var key = "hello"
    64  	startTime := time.Now()
    65  	err := client.Set(key, []byte("world"))
    66  	if err != nil {
    67  		return "", err
    68  	}
    69  
    70  	payload = append(payload, fmt.Sprintf("set_latency_ms %f", float64(time.Since(startTime).Nanoseconds())/1e6))
    71  
    72  	// Measure get latency
    73  	startTime = time.Now()
    74  	val, err := client.Get("hello")
    75  	if err != nil {
    76  		return strings.Join(payload, "\n"), err
    77  	}
    78  	payload = append(payload, fmt.Sprintf("get_latency_ms %f", float64(time.Since(startTime).Nanoseconds())/1e6))
    79  
    80  	log.Printf("%s=%s", key, string(val))
    81  	return strings.Join(payload, "\n"), nil
    82  }
    83  
    84  func main() {
    85  	flag.Parse()
    86  	if *server {
    87  		serverutils.Serve(func(request *epb.ProbeRequest, reply *epb.ProbeReply) {
    88  			payload, err := probe()
    89  			reply.Payload = proto.String(payload)
    90  			if err != nil {
    91  				reply.ErrorMessage = proto.String(err.Error())
    92  			}
    93  		})
    94  	}
    95  	payload, err := probe()
    96  	if err != nil {
    97  		log.Fatal(err)
    98  	}
    99  	fmt.Println(payload)
   100  }