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main.go
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main.go
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//
// Copyright © 2019 Uncharted Software Inc.
//
// 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.
package main
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
"os"
"runtime"
"strings"
"time"
"github.com/davecgh/go-spew/spew"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
log "github.com/unchartedsoftware/plog"
"github.com/urfave/cli"
"github.com/uncharted-distil/distil-test/env"
)
const (
messageTimeout = 20
)
var (
version = "unset"
timestamp = "unset"
)
type WSMessage struct {
ID string `json:"id"`
ResultID string `json:"resultId"`
RequestID string `json:"requestId"`
SolutionID string `json:"solutionId"`
Timestamp string `json:"timestamp"`
Progress string `json:"progress"`
Error string `json:"error"`
Complete bool `json:"complete"`
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
log.Infof("version: %s timestamp: %s", version, timestamp)
config, err := env.LoadConfig()
if err != nil {
log.Errorf("%+v", err)
os.Exit(1)
}
log.Infof("%+v", spew.Sdump(config))
app := cli.NewApp()
app.Name = "distil-test"
app.Version = "0.1.0"
app.Usage = "Test distil"
app.UsageText = "distil-test"
app.Flags = []cli.Flag{}
app.Action = func(c *cli.Context) error {
endpoint := fmt.Sprintf("%s:%d", strings.TrimPrefix(config.Endpoint, "http://"), config.AppPort)
// wait fot Distil
err = waitForDistil(config.RetryCount, fmt.Sprintf("http://%s/distil/config", endpoint))
if err != nil {
log.Errorf("%v", err)
return cli.NewExitError(errors.Cause(err), 2)
}
// initialize client
u := url.URL{Scheme: "ws", Host: endpoint, Path: "/ws"}
log.Infof("connecting to %s", u.String())
conn, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
if err != nil {
log.Errorf("%v", err)
return cli.NewExitError(errors.Cause(err), 2)
}
defer conn.Close()
log.Infof("Using app interface at `%s` ", endpoint)
err = conn.WriteMessage(websocket.TextMessage, getRequest(config.Dataset))
if err != nil {
log.Errorf("%v", err)
return cli.NewExitError(errors.Cause(err), 2)
}
success := isSuccess(conn)
if !success {
log.Errorf("no successful pipelines produced by Distil")
return cli.NewExitError(errors.Cause(errors.Errorf("no successful pipelines produced by Distil")), 2)
}
log.Infof("at least one pipeline was successfully created")
return nil
}
// run app
app.Run(os.Args)
}
func isSuccess(conn *websocket.Conn) bool {
// success is defined as one pipeline running to completion without error - this means
// we get at least one SOLUTION_COMPLETED message and a REQUEST_COMPLETED message.
log.Infof("Waiting for messages...")
success := false
for {
message, err := getMessage(conn)
if err != nil {
log.Errorf("%v", err)
break
}
log.Infof("%s", message)
var msg WSMessage
err = json.Unmarshal(message, &msg)
if err != nil {
log.Errorf("%v", err)
break
}
if msg.Complete {
break
}
if msg.Error != "" {
log.Errorf("error received from Distil")
}
if msg.Progress == "SOLUTION_COMPLETED" && msg.Error == "" {
success = true
}
}
log.Infof("Done reading messages")
return success
}
func getMessage(conn *websocket.Conn) ([]byte, error) {
results := make(chan []byte)
errs := make(chan error)
go getMessageSync(conn, results, errs)
select {
case res := <-results:
return res, nil
case err := <-errs:
return nil, err
case <-time.After(messageTimeout * time.Minute):
return nil, errors.Errorf("timeout waiting for message")
}
}
func getMessageSync(conn *websocket.Conn, results chan []byte, errs chan error) {
_, message, err := conn.ReadMessage()
if err != nil {
errs <- err
} else {
results <- message
}
}
func waitForDistil(maxRetries int, url string) error {
// can be determined by hitting the config endpoint
log.Infof("waiting for distil to be up at %s...", url)
for i := 0; i < maxRetries; i++ {
// will error if not available
_, err := http.Get(url)
if err == nil {
log.Infof("distil is up and running")
return nil
}
log.Infof("distil not up yet (attempt %d)", i+1)
time.Sleep(20 * time.Second)
}
return errors.Errorf("no response after %d retries", maxRetries)
}
func getRequest(dataset string) []byte {
return []byte(fmt.Sprintf(`
{
"type": "CREATE_SOLUTIONS",
"id": "0",
"dataset": "%s",
"filters": {
"filters": [],
"variables": ["cylinders", "displacement", "acceleration", "class"]
},
"maxSolutions": 3,
"maxTime": 1000,
"metrics": null,
"subTask": "univariate",
"target": "class",
"task": "regression"
}`, dataset))
}