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node.go
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node.go
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package agent
import (
"context"
"fmt"
"sort"
"strings"
"sync"
capabilityv1 "github.com/rancher/opni/pkg/apis/capability/v1"
controlv1 "github.com/rancher/opni/pkg/apis/control/v1"
corev1 "github.com/rancher/opni/pkg/apis/core/v1"
"github.com/rancher/opni/pkg/capabilities/wellknown"
"github.com/rancher/opni/pkg/health"
"github.com/rancher/opni/pkg/util"
"github.com/rancher/opni/plugins/metrics/pkg/agent/drivers"
"github.com/rancher/opni/plugins/metrics/pkg/apis/node"
"go.uber.org/zap"
"golang.org/x/exp/slices"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/emptypb"
"google.golang.org/protobuf/types/known/timestamppb"
)
type MetricsNode struct {
capabilityv1.UnsafeNodeServer
controlv1.UnsafeHealthServer
logger *zap.SugaredLogger
nodeClientMu sync.RWMutex
nodeClient node.NodeMetricsCapabilityClient
identityClientMu sync.RWMutex
identityClient controlv1.IdentityClient
healthListenerClientMu sync.RWMutex
healthListenerClient controlv1.HealthListenerClient
configMu sync.RWMutex
config *node.MetricsCapabilityConfig
listeners []chan<- *node.MetricsCapabilityConfig
conditions health.ConditionTracker
}
func NewMetricsNode(ct health.ConditionTracker, lg *zap.SugaredLogger) *MetricsNode {
node := &MetricsNode{
logger: lg,
conditions: ct,
}
node.conditions.AddListener(node.sendHealthUpdate)
return node
}
func (m *MetricsNode) sendHealthUpdate() {
// TODO this can be optimized to de-duplicate rapid updates
m.healthListenerClientMu.RLock()
defer m.healthListenerClientMu.RUnlock()
if m.healthListenerClient != nil {
health, err := m.GetHealth(context.TODO(), &emptypb.Empty{})
if err != nil {
m.logger.With(
zap.Error(err),
).Warn("failed to get node health")
return
}
if _, err := m.healthListenerClient.UpdateHealth(context.TODO(), health); err != nil {
m.logger.With(
zap.Error(err),
).Warn("failed to send node health update")
} else {
m.logger.Debug("sent node health update")
}
}
}
func (m *MetricsNode) AddConfigListener(ch chan<- *node.MetricsCapabilityConfig) {
m.listeners = append(m.listeners, ch)
}
func (m *MetricsNode) SetNodeClient(client node.NodeMetricsCapabilityClient) {
m.nodeClientMu.Lock()
defer m.nodeClientMu.Unlock()
m.nodeClient = client
go m.doSync(context.Background())
}
func (m *MetricsNode) SetIdentityClient(client controlv1.IdentityClient) {
m.identityClientMu.Lock()
defer m.identityClientMu.Unlock()
m.identityClient = client
}
func (m *MetricsNode) SetHealthListenerClient(client controlv1.HealthListenerClient) {
m.healthListenerClientMu.Lock()
m.healthListenerClient = client
m.healthListenerClientMu.Unlock()
m.sendHealthUpdate()
}
func (m *MetricsNode) Info(_ context.Context, _ *emptypb.Empty) (*capabilityv1.Details, error) {
return &capabilityv1.Details{
Name: wellknown.CapabilityMetrics,
Source: "plugin_metrics",
Drivers: drivers.ListNodeDrivers(),
}, nil
}
// Implements capabilityv1.NodeServer
func (m *MetricsNode) SyncNow(_ context.Context, req *capabilityv1.Filter) (*emptypb.Empty, error) {
if len(req.CapabilityNames) > 0 {
if !slices.Contains(req.CapabilityNames, wellknown.CapabilityMetrics) {
m.logger.Debug("ignoring sync request due to capability filter")
return &emptypb.Empty{}, nil
}
}
m.logger.Debug("received sync request")
m.nodeClientMu.RLock()
defer m.nodeClientMu.RUnlock()
if m.nodeClient == nil {
return nil, status.Error(codes.Unavailable, "not connected to node server")
}
defer func() {
go m.doSync(context.Background())
}()
return &emptypb.Empty{}, nil
}
// Implements controlv1.HealthServer
func (m *MetricsNode) GetHealth(_ context.Context, _ *emptypb.Empty) (*corev1.Health, error) {
m.configMu.RLock()
defer m.configMu.RUnlock()
conditions := m.conditions.List()
sort.Strings(conditions)
return &corev1.Health{
Ready: len(conditions) == 0,
Conditions: conditions,
Timestamp: timestamppb.New(m.conditions.LastModified()),
}, nil
}
func (m *MetricsNode) doSync(ctx context.Context) {
m.logger.Debug("syncing metrics node")
m.nodeClientMu.RLock()
defer m.nodeClientMu.RUnlock()
if m.nodeClient == nil {
m.conditions.Set(health.CondConfigSync, health.StatusPending, "no client, skipping sync")
return
}
m.configMu.RLock()
syncResp, err := m.nodeClient.Sync(ctx, &node.SyncRequest{
CurrentConfig: util.ProtoClone(m.config),
})
m.configMu.RUnlock()
if err != nil {
err := fmt.Errorf("error syncing metrics node: %w", err)
m.conditions.Set(health.CondConfigSync, health.StatusFailure, err.Error())
return
}
switch syncResp.ConfigStatus {
case node.ConfigStatus_UpToDate:
m.logger.Info("metrics node config is up to date")
case node.ConfigStatus_NeedsUpdate:
m.logger.Info("updating metrics node config")
m.updateConfig(syncResp.UpdatedConfig)
}
m.conditions.Clear(health.CondConfigSync)
}
func (m *MetricsNode) updateConfig(config *node.MetricsCapabilityConfig) {
m.configMu.Lock()
defer m.configMu.Unlock()
m.config = config
if !m.config.Enabled && len(m.config.Conditions) > 0 {
m.conditions.Set(health.CondBackend, health.StatusDisabled, strings.Join(m.config.Conditions, ", "))
} else {
m.conditions.Clear(health.CondBackend)
}
for _, ch := range m.listeners {
clone := util.ProtoClone(config)
select {
case ch <- clone:
default:
m.logger.Warn("slow config update listener detected")
ch <- clone
}
}
}