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airflow.go
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airflow.go
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package actions
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"path"
"time"
"github.com/treeverse/lakefs/pkg/graveler"
"github.com/treeverse/lakefs/pkg/logging"
)
type Airflow struct {
HookBase
URL string
DagID string
Username string
Password SecureString
DAGConf map[string]interface{}
}
const (
airflowClientDefaultTimeout = 5 * time.Second
airflowURLPropertyKey = "url"
airflowDagIDPropertyKey = "dag_id"
airflowUsernamePropertyKey = "username"
airflowPasswordPropertyKey = "password"
airflowConf = "dag_conf"
)
var (
errAirflowHookRequestFailed = errors.New("airflow hook request failed")
)
func NewAirflowHook(h ActionHook, action *Action) (Hook, error) {
airflowHook := Airflow{
HookBase: HookBase{
ID: h.ID,
ActionName: action.Name,
},
DAGConf: map[string]interface{}{},
}
var err error
airflowHook.URL, err = h.Properties.getRequiredProperty(airflowURLPropertyKey)
if err != nil {
return nil, fmt.Errorf("airflow hook url property: %w", err)
}
airflowHook.DagID, err = h.Properties.getRequiredProperty(airflowDagIDPropertyKey)
if err != nil {
return nil, fmt.Errorf("airflow hook DAG ID property: %w", err)
}
airflowHook.Username, err = h.Properties.getRequiredProperty(airflowUsernamePropertyKey)
if err != nil {
return nil, fmt.Errorf("airflow hook username property: %w", err)
}
rawPass, err := h.Properties.getRequiredProperty(airflowPasswordPropertyKey)
if err != nil {
return nil, fmt.Errorf("airflow hook password property: %w", err)
}
airflowHook.Password, err = NewSecureString(rawPass)
if err != nil {
return nil, fmt.Errorf("airflow hook password property: %w", err)
}
conf, ok := h.Properties[airflowConf]
if ok {
airflowHook.DAGConf, ok = conf.(Properties)
if !ok {
return nil, fmt.Errorf("airflow hook conf is not of type Properties: %w", errWrongValueType)
}
}
return &airflowHook, nil
}
type DagRunReq struct {
// Run ID. This together with DAG_ID are a unique key.
DagRunID string `json:"dag_run_id,omitempty"`
// JSON object describing additional configuration parameters.
Conf map[string]interface{} `json:"conf,omitempty"`
}
func (a *Airflow) Run(ctx context.Context, record graveler.HookRecord, writer *HookOutputWriter) error {
logging.FromContext(ctx).
WithField("hook_type", "airflow").
WithField("event_type", record.EventType).
Debug("hook action executing")
eventData, err := marshalEventInformation(a.ActionName, a.ID, record)
if err != nil {
return err
}
a.DAGConf["lakeFS_event"] = json.RawMessage(eventData)
dagRunID := fmt.Sprintf("lakeFS_hook_%s_%s", a.ID, time.Now().Format(time.RFC3339))
bod, err := json.Marshal(DagRunReq{
DagRunID: dagRunID,
Conf: a.DAGConf,
})
if err != nil {
return fmt.Errorf("request serialization error: %w", err)
}
reqReader := bytes.NewReader(bod)
dagRunURL, err := a.buildDagRunURL()
if err != nil {
return fmt.Errorf("building dag run path: %w", err)
}
buf := bytes.NewBufferString(fmt.Sprintf("Request:\nPOST %s\n", dagRunURL))
req, err := http.NewRequest(http.MethodPost, dagRunURL, reqReader)
if err != nil {
return fmt.Errorf("request serialization error: %w", err)
}
req.SetBasicAuth(a.Username, a.Password.val)
buf.WriteString(fmt.Sprintf("Username: %s, Password: %s\n", a.Username, a.Password.String()))
req.Header.Set("Content-Type", "application/json")
buf.WriteString(fmt.Sprintf("Body: %s\n\n", bod))
statusCode, err := executeAndLogResponse(ctx, req, buf, writer, airflowClientDefaultTimeout)
if err != nil {
return fmt.Errorf("failed executing airflow request: %w", err)
}
if statusCode != http.StatusOK {
return fmt.Errorf("status code (%d): %w", statusCode, errAirflowHookRequestFailed)
}
return nil
}
func (a *Airflow) buildDagRunURL() (string, error) {
u, err := url.Parse(a.URL)
if err != nil {
return "", err
}
u.Path = path.Join(u.Path, "/api/v1/dags/", a.DagID, "/dagRuns")
return u.String(), nil
}