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monitor.go
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monitor.go
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package monitor
import (
"context"
"errors"
"fmt"
"sort"
"time"
"github.com/Khan/genqlient/graphql"
"github.com/buildkite/agent-stack-k8s/api"
"go.uber.org/zap"
"k8s.io/client-go/kubernetes"
)
type Monitor struct {
gql graphql.Client
logger *zap.Logger
cfg api.Config
}
type Config struct {
Namespace string
Token string
MaxInFlight int
Org string
Tags []string
}
type Job struct {
api.CommandJob
Tag string
}
type JobHandler interface {
Create(context.Context, *Job) error
}
func New(logger *zap.Logger, k8s kubernetes.Interface, cfg api.Config) (*Monitor, error) {
graphqlClient := api.NewClient(cfg.BuildkiteToken)
return &Monitor{
gql: graphqlClient,
logger: logger,
cfg: cfg,
}, nil
}
func (m *Monitor) Start(ctx context.Context, handler JobHandler) <-chan error {
errs := make(chan error, 1)
go func() {
m.logger.Info("started")
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for {
for _, tag := range m.cfg.Tags {
buildsResponse, err := api.GetScheduledBuilds(ctx, m.gql, m.cfg.Org, []string{tag})
if err != nil {
if errors.Is(err, context.Canceled) {
continue
}
m.logger.Warn("failed to retrieve builds for pipeline", zap.Error(err))
continue
}
if buildsResponse.Organization.Id == nil {
errs <- fmt.Errorf("invalid organization: %s", m.cfg.Org)
return
}
builds := buildsResponse.Organization.Jobs.Edges
sort.Slice(builds, func(i, j int) bool {
cmdI := builds[i].Node.(*api.JobJobTypeCommand)
cmdJ := builds[j].Node.(*api.JobJobTypeCommand)
return cmdI.ScheduledAt.Before(cmdJ.ScheduledAt)
})
for _, job := range builds {
cmdJob := job.Node.(*api.JobJobTypeCommand)
m.logger.Debug("creating job", zap.String("uuid", cmdJob.Uuid))
if err := handler.Create(ctx, &Job{
CommandJob: cmdJob.CommandJob,
Tag: tag,
}); err != nil {
m.logger.Error("failed to create job", zap.Error(err))
}
}
}
select {
case <-ctx.Done():
close(errs)
return
case <-ticker.C:
continue
}
}
}()
return errs
}