/
autoScalerMessageListener.go
191 lines (153 loc) · 5.29 KB
/
autoScalerMessageListener.go
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package main
import (
"context"
"encoding/json"
"fmt"
"math/rand"
"net/http"
"os"
"time"
"github.com/actions/actions-runner-controller/github/actions"
"github.com/go-logr/logr"
"github.com/google/uuid"
"github.com/pkg/errors"
)
const (
sessionCreationMaxRetryCount = 10
)
type devContextKey bool
var testIgnoreSleep devContextKey = true
type AutoScalerClient struct {
client actions.SessionService
logger logr.Logger
lastMessageId int64
initialMessage *actions.RunnerScaleSetMessage
}
func NewAutoScalerClient(
ctx context.Context,
client actions.ActionsService,
logger *logr.Logger,
runnerScaleSetId int,
options ...func(*AutoScalerClient),
) (*AutoScalerClient, error) {
listener := AutoScalerClient{
logger: logger.WithName("auto_scaler"),
}
session, initialMessage, err := createSession(ctx, &listener.logger, client, runnerScaleSetId)
if err != nil {
return nil, fmt.Errorf("fail to create session. %w", err)
}
listener.lastMessageId = 0
listener.initialMessage = initialMessage
listener.client = newSessionClient(client, logger, session)
for _, option := range options {
option(&listener)
}
return &listener, nil
}
func createSession(ctx context.Context, logger *logr.Logger, client actions.ActionsService, runnerScaleSetId int) (*actions.RunnerScaleSetSession, *actions.RunnerScaleSetMessage, error) {
hostName, err := os.Hostname()
if err != nil {
hostName = uuid.New().String()
logger.Info("could not get hostname, fail back to a random string.", "fallback", hostName)
}
var runnerScaleSetSession *actions.RunnerScaleSetSession
var retryCount int
for {
runnerScaleSetSession, err = client.CreateMessageSession(ctx, runnerScaleSetId, hostName)
if err == nil {
break
}
clientSideError := &actions.HttpClientSideError{}
if errors.As(err, &clientSideError) && clientSideError.Code != http.StatusConflict {
logger.Info("unable to create message session. The error indicates something is wrong on the client side, won't make any retry.")
return nil, nil, fmt.Errorf("create message session http request failed. %w", err)
}
retryCount++
if retryCount >= sessionCreationMaxRetryCount {
return nil, nil, fmt.Errorf("create message session failed since it exceed %d retry limit. %w", sessionCreationMaxRetryCount, err)
}
logger.Info("unable to create message session. Will try again in 30 seconds", "error", err.Error())
if ok := ctx.Value(testIgnoreSleep); ok == nil {
time.Sleep(getRandomDuration(30, 45))
}
}
statistics, _ := json.Marshal(runnerScaleSetSession.Statistics)
logger.Info("current runner scale set statistics.", "statistics", string(statistics))
if runnerScaleSetSession.Statistics.TotalAvailableJobs > 0 || runnerScaleSetSession.Statistics.TotalAssignedJobs > 0 {
acquirableJobs, err := client.GetAcquirableJobs(ctx, runnerScaleSetId)
if err != nil {
return nil, nil, fmt.Errorf("get acquirable jobs failed. %w", err)
}
acquirableJobsJson, err := json.Marshal(acquirableJobs.Jobs)
if err != nil {
return nil, nil, fmt.Errorf("marshal acquirable jobs failed. %w", err)
}
initialMessage := &actions.RunnerScaleSetMessage{
MessageId: 0,
MessageType: "RunnerScaleSetJobMessages",
Statistics: runnerScaleSetSession.Statistics,
Body: string(acquirableJobsJson),
}
return runnerScaleSetSession, initialMessage, nil
}
initialMessage := &actions.RunnerScaleSetMessage{
MessageId: 0,
MessageType: "RunnerScaleSetJobMessages",
Statistics: runnerScaleSetSession.Statistics,
Body: "",
}
return runnerScaleSetSession, initialMessage, nil
}
func (m *AutoScalerClient) Close() error {
m.logger.Info("closing.")
return m.client.Close()
}
func (m *AutoScalerClient) GetRunnerScaleSetMessage(ctx context.Context, handler func(msg *actions.RunnerScaleSetMessage) error) error {
if m.initialMessage != nil {
err := handler(m.initialMessage)
if err != nil {
return fmt.Errorf("fail to process initial message. %w", err)
}
m.initialMessage = nil
return nil
}
for {
message, err := m.client.GetMessage(ctx, m.lastMessageId)
if err != nil {
return fmt.Errorf("get message failed from refreshing client. %w", err)
}
if message == nil {
continue
}
err = handler(message)
if err != nil {
return fmt.Errorf("handle message failed. %w", err)
}
m.lastMessageId = message.MessageId
return m.deleteMessage(ctx, message.MessageId)
}
}
func (m *AutoScalerClient) deleteMessage(ctx context.Context, messageId int64) error {
err := m.client.DeleteMessage(ctx, messageId)
if err != nil {
return fmt.Errorf("delete message failed from refreshing client. %w", err)
}
m.logger.Info("deleted message.", "messageId", messageId)
return nil
}
func (m *AutoScalerClient) AcquireJobsForRunnerScaleSet(ctx context.Context, requestIds []int64) error {
m.logger.Info("acquiring jobs.", "request count", len(requestIds), "requestIds", fmt.Sprint(requestIds))
if len(requestIds) == 0 {
return nil
}
ids, err := m.client.AcquireJobs(ctx, requestIds)
if err != nil {
return fmt.Errorf("acquire jobs failed from refreshing client. %w", err)
}
m.logger.Info("acquired jobs.", "requested", len(requestIds), "acquired", len(ids))
return nil
}
func getRandomDuration(minSeconds, maxSeconds int) time.Duration {
return time.Duration(rand.Intn(maxSeconds-minSeconds)+minSeconds) * time.Second
}