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service_logs.go
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service_logs.go
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package app
import (
"bytes"
"io"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/go-openapi/runtime/middleware"
"github.com/kuberlogic/kuberlogic/modules/dynamic-apiserver/pkg/generated/models"
apiService "github.com/kuberlogic/kuberlogic/modules/dynamic-apiserver/pkg/generated/restapi/operations/service"
)
func (h *handlers) ServiceLogsHandler(params apiService.ServiceLogsParams, _ *models.Principal) middleware.Responder {
ctx := params.HTTPRequest.Context()
kls, err := h.Services().Get(ctx, params.ServiceID, metav1.GetOptions{})
if k8serrors.IsNotFound(err) {
return apiService.NewServiceLogsBadRequest().WithPayload(&models.Error{
Message: "service does not exist",
})
} else if err != nil {
e := errors.Wrap(err, "failed to get service")
h.log.Errorw(e.Error())
return apiService.NewServiceLogsServiceUnavailable().WithPayload(&models.Error{
Message: e.Error(),
})
}
listOptions := h.ListOptionsByKeyValue("docker-compose.service/name", ¶ms.ServiceID)
pods, err := h.clientset.CoreV1().Pods(kls.Status.Namespace).List(ctx, listOptions)
if err != nil {
e := errors.Wrap(err, "error getting service pods")
h.log.Errorw(e.Error())
return apiService.NewServiceLogsServiceUnavailable().WithPayload(&models.Error{
Message: e.Error(),
})
}
if len(pods.Items) < 1 {
msg := "error listing service pods, no pod is available"
h.log.Errorw(msg)
return apiService.NewServiceLogsServiceUnavailable().WithPayload(&models.Error{
Message: msg,
})
}
pod := pods.Items[0] // filtering by labels should return only one pod
response := models.Logs{}
for _, container := range pod.Spec.Containers {
if params.ContainerName != nil && container.Name != *params.ContainerName {
continue
}
req := h.clientset.CoreV1().Pods(kls.Status.Namespace).GetLogs(pod.Name, &corev1.PodLogOptions{
Container: container.Name,
})
podLogs, err := req.Stream(ctx)
if err != nil {
e := errors.Wrapf(err, "error listing container '%s' logs", container.Name)
h.log.Errorw(e.Error())
return apiService.NewServiceLogsServiceUnavailable().WithPayload(&models.Error{
Message: e.Error(),
})
}
buf := new(bytes.Buffer)
_, err = io.Copy(buf, podLogs)
if podLogsErr := podLogs.Close(); err != nil {
e := errors.Wrapf(podLogsErr, "error closing pod logs stream for container '%s'", container.Name)
h.log.Errorw(e.Error())
return apiService.NewServiceLogsServiceUnavailable().WithPayload(&models.Error{
Message: e.Error(),
})
}
if err != nil {
e := errors.Wrapf(err, "error obtaining container '%s' logs", container.Name)
h.log.Errorw(e.Error())
return apiService.NewServiceLogsServiceUnavailable().WithPayload(&models.Error{
Message: e.Error(),
})
}
response = append(response, &models.Log{ContainerName: container.Name, Logs: buf.String()})
}
return apiService.NewServiceLogsOK().WithPayload(response)
}