runservice: handle multiple executor archs

An executor can handle multiple archs (an executor that talks with a k8s cluster
with multi arch nodes). Don't use a label for archs but a custom executor
field.

internal/services/runservice/executor/driver/docker.go

@@ -22,11 +22,13 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"runtime"
 	"strconv"
 	"strings"
 	"time"
 
 	"github.com/pkg/errors"
+	"github.com/sorintlab/agola/internal/common"
 	"github.com/sorintlab/agola/internal/services/runservice/executor/registry"
 
 	"github.com/docker/docker/api/types"
@@ -119,6 +121,11 @@ func (d *DockerDriver) CopyToolbox(ctx context.Context) error {
 	return nil
 }
 
+func (d *DockerDriver) Archs(ctx context.Context) ([]common.Arch, error) {
+	// since we are using the local docker driver we can return our go arch information
+	return []common.Arch{common.ArchFromString(runtime.GOARCH)}, nil
+}
+
 func (d *DockerDriver) NewPod(ctx context.Context, podConfig *PodConfig, out io.Writer) (Pod, error) {
 	if len(podConfig.Containers) == 0 {
 		return nil, errors.Errorf("empty container config")

internal/services/runservice/executor/driver/driver.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"io"
 
+	"github.com/sorintlab/agola/internal/common"
 	"github.com/sorintlab/agola/internal/services/runservice/executor/registry"
 )
 
@@ -47,6 +48,7 @@ type Driver interface {
 	GetPods(ctx context.Context, all bool) ([]Pod, error)
 	ExecutorGroup(ctx context.Context) (string, error)
 	GetExecutors(ctx context.Context) ([]string, error)
+	Archs(ctx context.Context) ([]common.Arch, error)
 }
 
 type Pod interface {

internal/services/runservice/executor/driver/k8s.go

@@ -29,6 +29,7 @@ import (
 	"github.com/docker/docker/pkg/archive"
 	"github.com/pkg/errors"
 	uuid "github.com/satori/go.uuid"
+	"github.com/sorintlab/agola/internal/common"
 	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
@@ -198,6 +199,25 @@ func (d *K8sDriver) Setup(ctx context.Context) error {
 	return nil
 }
 
+func (d *K8sDriver) Archs(ctx context.Context) ([]common.Arch, error) {
+	// TODO(sgotti) use go client listers instead of querying every time
+	nodeClient := d.client.CoreV1().Nodes()
+	nodes, err := nodeClient.List(metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	archsMap := map[common.Arch]struct{}{}
+	archs := []common.Arch{}
+	for _, node := range nodes.Items {
+		archsMap[common.ArchFromString(node.Status.NodeInfo.Architecture)] = struct{}{}
+	}
+	for arch := range archsMap {
+		archs = append(archs, arch)
+	}
+
+	return archs, nil
+}
+
 func (d *K8sDriver) ExecutorGroup(ctx context.Context) (string, error) {
 	return d.executorsGroupID, nil
 }

internal/services/runservice/executor/executor.go

@@ -27,7 +27,6 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"sync"
 	"time"
@@ -657,9 +656,10 @@ func (e *Executor) sendExecutorStatus(ctx context.Context) error {
 
 	activeTasks := e.runningTasks.len()
 
-	// Add special labels (and override config provided ones)
+	archs, err := e.driver.Archs(ctx)
-	arch := runtime.GOARCH
+	if err != nil {
-	labels["arch"] = arch
+		return err
+	}
 
 	executorGroup, err := e.driver.ExecutorGroup(ctx)
 	if err != nil {
@@ -689,6 +689,7 @@ func (e *Executor) sendExecutorStatus(ctx context.Context) error {
 
 	executor := &types.Executor{
 		ID:                e.id,
+		Archs:             archs,
 		ListenURL:         e.listenURL,
 		Labels:            labels,
 		ActiveTasksLimit:  e.c.ActiveTasksLimit,

internal/services/runservice/scheduler/scheduler.go

@@ -290,15 +290,21 @@ func (s *Scheduler) chooseExecutor(ctx context.Context, rct *types.RunConfigTask
 	for _, e := range executors {
 		// if arch is not defined use any executor arch
 		if rct.Runtime.Arch != "" {
-			if e.Labels["arch"] != string(rct.Runtime.Arch) {
+			hasArch := false
+			for _, arch := range e.Archs {
+				if arch == rct.Runtime.Arch {
+					hasArch = true
+				}
+			}
+			if !hasArch {
 				continue
 			}
+		}
 		if e.ActiveTasksLimit != 0 {
 			if e.ActiveTasks >= e.ActiveTasksLimit {
 				continue
 			}
 		}
-		}
 
 		return e, nil
 	}

internal/services/runservice/types/types.go

@@ -664,6 +664,8 @@ type Executor struct {
 	ID        string `json:"id,omitempty"`
 	ListenURL string `json:"listenURL,omitempty"`
 
+	Archs []common.Arch `json:"archs,omitempty"`
+
 	Labels map[string]string `json:"labels,omitempty"`
 
 	ActiveTasksLimit int `json:"active_tasks_limit,omitempty"`