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| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "net/http" |
| 6 | + "io/ioutil" |
| 7 | + "encoding/json" |
| 8 | + "time" |
| 9 | + "flag" |
| 10 | + "log" |
| 11 | + "strings" |
| 12 | +) |
| 13 | + |
| 14 | +type execution struct { |
| 15 | + DurationSeconds float64 |
| 16 | + Hostname string |
| 17 | + node string |
| 18 | + body string |
| 19 | + responseSeconds float64 |
| 20 | +} |
| 21 | + |
| 22 | +var ( |
| 23 | + lbHostPort, nodesStr, route string |
| 24 | + numExecutions, maxPrime, numLoops int |
| 25 | + nodes []string |
| 26 | + nodesByContainerId map[string]string = make(map[string]string) |
| 27 | + verbose bool |
| 28 | +) |
| 29 | + |
| 30 | +func init() { |
| 31 | + flag.StringVar(&lbHostPort, "lb", "localhost:8081", "host and port of load balancer") |
| 32 | + flag.StringVar(&nodesStr, "nodes", "localhost:8080", "comma-delimited list of nodes (host:port) balanced by the load balancer (needed to discover container id of each)") |
| 33 | + flag.StringVar(&route, "route", "/r/primesapp/primes", "path representing the route to the primes function") |
| 34 | + flag.IntVar(&numExecutions, "calls", 100, "number of times to call the route") |
| 35 | + flag.IntVar(&maxPrime, "max", 1000000, "maximum number to search for primes (higher number consumes more memory)") |
| 36 | + flag.IntVar(&numLoops, "loops", 1, "number of times to execute the primes calculation (ex: 'loops=2' means run the primes calculation twice)") |
| 37 | + flag.BoolVar(&verbose, "v", false, "true for more verbose output") |
| 38 | + flag.Parse() |
| 39 | + |
| 40 | + if maxPrime < 3 { |
| 41 | + log.Fatal("-max must be 3 or greater") |
| 42 | + } |
| 43 | + if numLoops < 1 { |
| 44 | + log.Fatal("-loops must be 1 or greater") |
| 45 | + } |
| 46 | + |
| 47 | + nodes = strings.Split(nodesStr, ",") |
| 48 | +} |
| 49 | + |
| 50 | +func executeFunction(hostPort, path string, max, loops int) (execution, error) { |
| 51 | + var e execution |
| 52 | + |
| 53 | + start := time.Now() |
| 54 | + resp, err := http.Get(fmt.Sprintf("http://%s%s?max=%d&loops=%d", hostPort, path, max, loops)) |
| 55 | + e.responseSeconds = time.Since(start).Seconds() |
| 56 | + if err != nil { |
| 57 | + return e, err |
| 58 | + } |
| 59 | + defer resp.Body.Close() |
| 60 | + if resp.StatusCode != http.StatusOK { |
| 61 | + return e, fmt.Errorf("function returned status code: %d", resp.StatusCode) |
| 62 | + } |
| 63 | + |
| 64 | + body, err := ioutil.ReadAll(resp.Body) |
| 65 | + if err != nil { |
| 66 | + return e, err |
| 67 | + } |
| 68 | + |
| 69 | + err = json.Unmarshal(body, &e) |
| 70 | + if err != nil { |
| 71 | + e.body = string(body) // set the body in the execution so that it is available for logging |
| 72 | + return e, err |
| 73 | + } |
| 74 | + e.node = nodesByContainerId[e.Hostname] |
| 75 | + |
| 76 | + return e, nil |
| 77 | +} |
| 78 | + |
| 79 | +func invokeLoadBalancer(hostPort, path string, numExecutions, max, loops int) { |
| 80 | + executionsByNode := make(map[string][]execution) |
| 81 | + fmt.Printf("All primes will be calculated up to %d, a total of %d time(s)\n", maxPrime, numLoops) |
| 82 | + fmt.Printf("Calling route %s %d times (through the load balancer)...\n", route, numExecutions) |
| 83 | + |
| 84 | + for i := 0; i < numExecutions; i++ { |
| 85 | + e, err := executeFunction(hostPort, path, max, loops) |
| 86 | + if err == nil { |
| 87 | + if ex, ok := executionsByNode[e.node]; ok { |
| 88 | + executionsByNode[e.node] = append(ex, e) |
| 89 | + } else { |
| 90 | + // Create a slice to contain the list of executions for this host |
| 91 | + executionsByNode[e.node] = []execution{e} |
| 92 | + } |
| 93 | + if verbose { |
| 94 | + fmt.Printf(" %s in-function duration: %fsec, response time: %fsec\n", e.node, e.DurationSeconds, e.responseSeconds) |
| 95 | + } |
| 96 | + } else { |
| 97 | + fmt.Printf(" Ignoring failed execution on node %s: %v\n", e.node, err) |
| 98 | + fmt.Printf(" JSON: %s\n", e.body) |
| 99 | + } |
| 100 | + } |
| 101 | + |
| 102 | + fmt.Println("Results (executions per node):") |
| 103 | + for node, ex := range executionsByNode { |
| 104 | + fmt.Printf(" %s %d\n", node, len(ex)) |
| 105 | + } |
| 106 | +} |
| 107 | + |
| 108 | +func discoverContainerIds() { |
| 109 | + // Discover the Docker hostname of each node; create a mapping of hostnames to host/port. |
| 110 | + // This is needed because IronFunctions doesn't make the host/port available to the function (as of Mar 2017). |
| 111 | + fmt.Println("Discovering container ids for every node (use Docker's HOSTNAME env var as a container id)...") |
| 112 | + for _, s := range nodes { |
| 113 | + if e, err := executeFunction(s, route, 100, 1); err == nil { |
| 114 | + nodesByContainerId[e.Hostname] = s |
| 115 | + fmt.Printf(" %s %s\n", s, e.Hostname) |
| 116 | + } else { |
| 117 | + fmt.Printf(" Ignoring host %s which returned error: %v\n", s, err) |
| 118 | + fmt.Printf(" JSON: %s\n", e.body) |
| 119 | + } |
| 120 | + } |
| 121 | +} |
| 122 | + |
| 123 | +func main() { |
| 124 | + discoverContainerIds() |
| 125 | + invokeLoadBalancer(lbHostPort, route, numExecutions, maxPrime, numLoops) |
| 126 | +} |
| 127 | + |
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