Golang NodeUpdateResponse.EvalCreateIndex方法代码示例

// Deregister is used to remove a client from the client. If a client should
// just be made unavailable for scheduling, a status update is prefered.
func (n *Node) Deregister(args *structs.NodeDeregisterRequest, reply *structs.NodeUpdateResponse) error {
	if done, err := n.srv.forward("Node.Deregister", args, args, reply); done {
		return err
	}
	defer metrics.MeasureSince([]string{"nomad", "client", "deregister"}, time.Now())

	// Verify the arguments
	if args.NodeID == "" {
		return fmt.Errorf("missing node ID for client deregistration")
	}

	// Commit this update via Raft
	_, index, err := n.srv.raftApply(structs.NodeDeregisterRequestType, args)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: Deregister failed: %v", err)
		return err
	}

	// Clear the heartbeat timer if any
	n.srv.clearHeartbeatTimer(args.NodeID)

	// Create the evaluations for this node
	evalIDs, evalIndex, err := n.createNodeEvals(args.NodeID, index)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: eval creation failed: %v", err)
		return err
	}

	// Setup the reply
	reply.EvalIDs = evalIDs
	reply.EvalCreateIndex = evalIndex
	reply.NodeModifyIndex = index
	reply.Index = index
	return nil
}

// Deregister is used to remove a client from the cluster. If a client should
// just be made unavailable for scheduling, a status update is preferred.
func (n *Node) Deregister(args *structs.NodeDeregisterRequest, reply *structs.NodeUpdateResponse) error {
	if done, err := n.srv.forward("Node.Deregister", args, args, reply); done {
		return err
	}
	defer metrics.MeasureSince([]string{"nomad", "client", "deregister"}, time.Now())

	// Verify the arguments
	if args.NodeID == "" {
		return fmt.Errorf("missing node ID for client deregistration")
	}

	// Commit this update via Raft
	_, index, err := n.srv.raftApply(structs.NodeDeregisterRequestType, args)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: Deregister failed: %v", err)
		return err
	}

	// Clear the heartbeat timer if any
	n.srv.clearHeartbeatTimer(args.NodeID)

	// Create the evaluations for this node
	evalIDs, evalIndex, err := n.createNodeEvals(args.NodeID, index)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: eval creation failed: %v", err)
		return err
	}

	// Determine if there are any Vault accessors on the node
	accessors, err := n.srv.State().VaultAccessorsByNode(args.NodeID)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: looking up accessors for node %q failed: %v", args.NodeID, err)
		return err
	}

	if len(accessors) != 0 {
		if err := n.srv.vault.RevokeTokens(context.Background(), accessors, true); err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: revoking accessors for node %q failed: %v", args.NodeID, err)
			return err
		}
	}

	// Setup the reply
	reply.EvalIDs = evalIDs
	reply.EvalCreateIndex = evalIndex
	reply.NodeModifyIndex = index
	reply.Index = index
	return nil
}

// Evaluate is used to force a re-evaluation of the node
func (n *Node) Evaluate(args *structs.NodeEvaluateRequest, reply *structs.NodeUpdateResponse) error {
	if done, err := n.srv.forward("Node.Evaluate", args, args, reply); done {
		return err
	}
	defer metrics.MeasureSince([]string{"nomad", "client", "evaluate"}, time.Now())

	// Verify the arguments
	if args.NodeID == "" {
		return fmt.Errorf("missing node ID for evaluation")
	}

	// Look for the node
	snap, err := n.srv.fsm.State().Snapshot()
	if err != nil {
		return err
	}
	node, err := snap.NodeByID(args.NodeID)
	if err != nil {
		return err
	}
	if node == nil {
		return fmt.Errorf("node not found")
	}

	// Create the evaluation
	evalIDs, evalIndex, err := n.createNodeEvals(args.NodeID, node.ModifyIndex)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: eval creation failed: %v", err)
		return err
	}
	reply.EvalIDs = evalIDs
	reply.EvalCreateIndex = evalIndex

	// Set the reply index
	reply.Index = evalIndex

	n.srv.peerLock.RLock()
	defer n.srv.peerLock.RUnlock()
	if err := n.constructNodeServerInfoResponse(snap, reply); err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: failed to populate NodeUpdateResponse: %v", err)
		return err
	}
	return nil
}

// Register is used to upsert a client that is available for scheduling
func (n *Node) Register(args *structs.NodeRegisterRequest, reply *structs.NodeUpdateResponse) error {
	if done, err := n.srv.forward("Node.Register", args, args, reply); done {
		return err
	}
	defer metrics.MeasureSince([]string{"nomad", "client", "register"}, time.Now())

	// Validate the arguments
	if args.Node == nil {
		return fmt.Errorf("missing node for client registration")
	}
	if args.Node.ID == "" {
		return fmt.Errorf("missing node ID for client registration")
	}
	if args.Node.Datacenter == "" {
		return fmt.Errorf("missing datacenter for client registration")
	}
	if args.Node.Name == "" {
		return fmt.Errorf("missing node name for client registration")
	}

	// Default the status if none is given
	if args.Node.Status == "" {
		args.Node.Status = structs.NodeStatusInit
	}
	if !structs.ValidNodeStatus(args.Node.Status) {
		return fmt.Errorf("invalid status for node")
	}

	// Compute the node class
	if err := args.Node.ComputeClass(); err != nil {
		return fmt.Errorf("failed to computed node class: %v", err)
	}

	// Commit this update via Raft
	_, index, err := n.srv.raftApply(structs.NodeRegisterRequestType, args)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: Register failed: %v", err)
		return err
	}
	reply.NodeModifyIndex = index

	// Check if we should trigger evaluations
	if structs.ShouldDrainNode(args.Node.Status) {
		evalIDs, evalIndex, err := n.createNodeEvals(args.Node.ID, index)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: eval creation failed: %v", err)
			return err
		}
		reply.EvalIDs = evalIDs
		reply.EvalCreateIndex = evalIndex
	}

	// Check if we need to setup a heartbeat
	if !args.Node.TerminalStatus() {
		ttl, err := n.srv.resetHeartbeatTimer(args.Node.ID)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: heartbeat reset failed: %v", err)
			return err
		}
		reply.HeartbeatTTL = ttl
	}

	// Set the reply index
	reply.Index = index
	return nil
}

// UpdateStatus is used to update the status of a client node
func (n *Node) UpdateStatus(args *structs.NodeUpdateStatusRequest, reply *structs.NodeUpdateResponse) error {
	if done, err := n.srv.forward("Node.UpdateStatus", args, args, reply); done {
		return err
	}
	defer metrics.MeasureSince([]string{"nomad", "client", "update_status"}, time.Now())

	// Verify the arguments
	if args.NodeID == "" {
		return fmt.Errorf("missing node ID for client deregistration")
	}
	if !structs.ValidNodeStatus(args.Status) {
		return fmt.Errorf("invalid status for node")
	}

	// Look for the node
	snap, err := n.srv.fsm.State().Snapshot()
	if err != nil {
		return err
	}
	node, err := snap.NodeByID(args.NodeID)
	if err != nil {
		return err
	}
	if node == nil {
		return fmt.Errorf("node not found")
	}

	// Commit this update via Raft
	var index uint64
	if node.Status != args.Status {
		_, index, err = n.srv.raftApply(structs.NodeUpdateStatusRequestType, args)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: status update failed: %v", err)
			return err
		}
		reply.NodeModifyIndex = index
	}

	// Check if we should trigger evaluations
	initToReady := node.Status == structs.NodeStatusInit && args.Status == structs.NodeStatusReady
	terminalToReady := node.Status == structs.NodeStatusDown && args.Status == structs.NodeStatusReady
	transitionToReady := initToReady || terminalToReady
	if structs.ShouldDrainNode(args.Status) || transitionToReady {
		evalIDs, evalIndex, err := n.createNodeEvals(args.NodeID, index)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: eval creation failed: %v", err)
			return err
		}
		reply.EvalIDs = evalIDs
		reply.EvalCreateIndex = evalIndex
	}

	// Check if we need to setup a heartbeat
	if args.Status != structs.NodeStatusDown {
		ttl, err := n.srv.resetHeartbeatTimer(args.NodeID)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: heartbeat reset failed: %v", err)
			return err
		}
		reply.HeartbeatTTL = ttl
	}

	// Set the reply index
	reply.Index = index
	return nil
}

// Register is used to upsert a client that is available for scheduling
func (n *Node) Register(args *structs.NodeRegisterRequest, reply *structs.NodeUpdateResponse) error {
	if done, err := n.srv.forward("Node.Register", args, args, reply); done {
		return err
	}
	defer metrics.MeasureSince([]string{"nomad", "client", "register"}, time.Now())

	// Validate the arguments
	if args.Node == nil {
		return fmt.Errorf("missing node for client registration")
	}
	if args.Node.ID == "" {
		return fmt.Errorf("missing node ID for client registration")
	}
	if args.Node.Datacenter == "" {
		return fmt.Errorf("missing datacenter for client registration")
	}
	if args.Node.Name == "" {
		return fmt.Errorf("missing node name for client registration")
	}

	// Default the status if none is given
	if args.Node.Status == "" {
		args.Node.Status = structs.NodeStatusInit
	}
	if !structs.ValidNodeStatus(args.Node.Status) {
		return fmt.Errorf("invalid status for node")
	}

	// Set the timestamp when the node is registered
	args.Node.StatusUpdatedAt = time.Now().Unix()

	// Compute the node class
	if err := args.Node.ComputeClass(); err != nil {
		return fmt.Errorf("failed to computed node class: %v", err)
	}

	// Look for the node so we can detect a state transistion
	snap, err := n.srv.fsm.State().Snapshot()
	if err != nil {
		return err
	}
	originalNode, err := snap.NodeByID(args.Node.ID)
	if err != nil {
		return err
	}

	// Commit this update via Raft
	_, index, err := n.srv.raftApply(structs.NodeRegisterRequestType, args)
	if err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: Register failed: %v", err)
		return err
	}
	reply.NodeModifyIndex = index

	// Check if we should trigger evaluations
	originalStatus := structs.NodeStatusInit
	if originalNode != nil {
		originalStatus = originalNode.Status
	}
	transitionToReady := transitionedToReady(args.Node.Status, originalStatus)
	if structs.ShouldDrainNode(args.Node.Status) || transitionToReady {
		evalIDs, evalIndex, err := n.createNodeEvals(args.Node.ID, index)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: eval creation failed: %v", err)
			return err
		}
		reply.EvalIDs = evalIDs
		reply.EvalCreateIndex = evalIndex
	}

	// Check if we need to setup a heartbeat
	if !args.Node.TerminalStatus() {
		ttl, err := n.srv.resetHeartbeatTimer(args.Node.ID)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: heartbeat reset failed: %v", err)
			return err
		}
		reply.HeartbeatTTL = ttl
	}

	// Set the reply index
	reply.Index = index
	snap, err = n.srv.fsm.State().Snapshot()
	if err != nil {
		return err
	}

	n.srv.peerLock.RLock()
	defer n.srv.peerLock.RUnlock()
	if err := n.constructNodeServerInfoResponse(snap, reply); err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: failed to populate NodeUpdateResponse: %v", err)
		return err
	}

	return nil
}

// UpdateStatus is used to update the status of a client node
func (n *Node) UpdateStatus(args *structs.NodeUpdateStatusRequest, reply *structs.NodeUpdateResponse) error {
	if done, err := n.srv.forward("Node.UpdateStatus", args, args, reply); done {
		return err
	}
	defer metrics.MeasureSince([]string{"nomad", "client", "update_status"}, time.Now())

	// Verify the arguments
	if args.NodeID == "" {
		return fmt.Errorf("missing node ID for client status update")
	}
	if !structs.ValidNodeStatus(args.Status) {
		return fmt.Errorf("invalid status for node")
	}

	// Look for the node
	snap, err := n.srv.fsm.State().Snapshot()
	if err != nil {
		return err
	}
	node, err := snap.NodeByID(args.NodeID)
	if err != nil {
		return err
	}
	if node == nil {
		return fmt.Errorf("node not found")
	}

	// XXX: Could use the SecretID here but have to update the heartbeat system
	// to track SecretIDs.

	// Update the timestamp of when the node status was updated
	node.StatusUpdatedAt = time.Now().Unix()

	// Commit this update via Raft
	var index uint64
	if node.Status != args.Status {
		_, index, err = n.srv.raftApply(structs.NodeUpdateStatusRequestType, args)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: status update failed: %v", err)
			return err
		}
		reply.NodeModifyIndex = index
	}

	// Check if we should trigger evaluations
	transitionToReady := transitionedToReady(args.Status, node.Status)
	if structs.ShouldDrainNode(args.Status) || transitionToReady {
		evalIDs, evalIndex, err := n.createNodeEvals(args.NodeID, index)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: eval creation failed: %v", err)
			return err
		}
		reply.EvalIDs = evalIDs
		reply.EvalCreateIndex = evalIndex
	}

	// Check if we need to setup a heartbeat
	switch args.Status {
	case structs.NodeStatusDown:
		// Determine if there are any Vault accessors on the node
		accessors, err := n.srv.State().VaultAccessorsByNode(args.NodeID)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: looking up accessors for node %q failed: %v", args.NodeID, err)
			return err
		}

		if len(accessors) != 0 {
			if err := n.srv.vault.RevokeTokens(context.Background(), accessors, true); err != nil {
				n.srv.logger.Printf("[ERR] nomad.client: revoking accessors for node %q failed: %v", args.NodeID, err)
				return err
			}
		}
	default:
		ttl, err := n.srv.resetHeartbeatTimer(args.NodeID)
		if err != nil {
			n.srv.logger.Printf("[ERR] nomad.client: heartbeat reset failed: %v", err)
			return err
		}
		reply.HeartbeatTTL = ttl
	}

	// Set the reply index and leader
	reply.Index = index
	n.srv.peerLock.RLock()
	defer n.srv.peerLock.RUnlock()
	if err := n.constructNodeServerInfoResponse(snap, reply); err != nil {
		n.srv.logger.Printf("[ERR] nomad.client: failed to populate NodeUpdateResponse: %v", err)
		return err
	}

	return nil
}