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dag.go
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dag.go
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package lunchbox
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/aws/aws-sdk-go/service/ecs"
"github.com/robfig/cron"
"sigs.k8s.io/yaml"
)
type DagSource struct {
Cron string
Cluster string
TaskDefinition string
LaunchType string
NetworkConfiguration ecs.NetworkConfiguration
Overrides ecs.TaskOverride
}
type Dag struct {
ID string
Source *DagSource
Schedule cron.Schedule
}
func readDag(file string) (*DagSource, error) {
data, err := ioutil.ReadFile(file)
if err != nil {
return nil, fmt.Errorf("ioutil.ReadFile failed: %s", err)
}
t, err := template.New("").Parse(string(data))
if err != nil {
return nil, fmt.Errorf("template.Parse failed: %s", err)
}
out := new(bytes.Buffer)
if err := t.Execute(out, nil); err != nil {
return nil, fmt.Errorf("template.Execute failed: %s", err)
}
dag := &DagSource{}
err = yaml.Unmarshal(out.Bytes(), dag)
if err != nil {
return nil, fmt.Errorf("yaml.UnmarshalStrict failed: %s", err)
}
return dag, nil
}
func getDagDir() (string, error) {
dagDir := os.Getenv("DAG_DIR")
if dagDir == "" {
currentDir, err := os.Getwd()
if err != nil {
return "", fmt.Errorf("os.Getwd failed: %s", err)
}
dagDir = filepath.Join(currentDir, "dags")
}
return dagDir, nil
}
func LoadFromTaskDir() ([]*Dag, error) {
dagDir, err := getDagDir()
if err != nil {
return nil, fmt.Errorf("getDagDir failed: %s", err)
}
files, err := ioutil.ReadDir(dagDir)
if err != nil {
return nil, fmt.Errorf("ioutil.ReadDir failed: %s", err)
}
var dags []*Dag
cronParser := cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow)
for _, file := range files {
if file.IsDir() {
continue
}
if strings.HasSuffix(file.Name(), ".yml") || strings.HasSuffix(file.Name(), ".yaml") {
source, err := readDag(filepath.Join(dagDir, file.Name()))
if err != nil {
return nil, fmt.Errorf("readDag failed: %s", err)
}
schedule, err := cronParser.Parse(source.Cron)
if err != nil {
return nil, fmt.Errorf("cronParser.Parse failed: %s", err)
}
dags = append(dags, &Dag{
Source: source,
Schedule: schedule,
})
}
}
if len(dags) == 0 {
return nil, fmt.Errorf("no dags found")
}
return dags, nil
}