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Add better error messages for unavailable swarm commands 

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi 2016-06-23 13:52:41 -07:00
parent 487931902c
commit 803733120a
1 changed files with 29 additions and 20 deletions
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49
daemon/cluster/cluster.go
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@ -39,9 +39,6 @@ const (
maxReconnectDelay = 30 * time.Second
)
// ErrNoManager is returned then a manager-only function is called on non-manager
var ErrNoManager = fmt.Errorf("This node is not participating as a Swarm manager")
// ErrNoSwarm is returned on leaving a cluster that was never initialized
var ErrNoSwarm = fmt.Errorf("This node is not part of Swarm")
@ -476,7 +473,7 @@ func (c *Cluster) Inspect() (types.Swarm, error) {
defer c.RUnlock()
if !c.isActiveManager() {
return types.Swarm{}, ErrNoManager
return types.Swarm{}, c.errNoManager()
}
swarm, err := getSwarm(c.getRequestContext(), c.client)
@ -497,7 +494,7 @@ func (c *Cluster) Update(version uint64, spec types.Spec) error {
defer c.RUnlock()
if !c.isActiveManager() {
return ErrNoManager
return c.errNoManager()
}
swarm, err := getSwarm(c.getRequestContext(), c.client)
@ -629,13 +626,25 @@ func (c *Cluster) isActiveManager() bool {
return c.conn != nil
}
// errNoManager returns error describing why manager commands can't be used.
// Call with read lock.
func (c *Cluster) errNoManager() error {
if c.node == nil {
return fmt.Errorf("This node is not a Swarm manager. Use \"docker swarm init\" or \"docker swarm join --manager\" to connect this node to Swarm and try again.")
}
if c.node.Manager() != nil {
return fmt.Errorf("This node is not a Swarm manager. Manager is being prepared or has trouble connecting to the cluster.")
}
return fmt.Errorf("This node is not a Swarm manager. Worker nodes can't be used to view or modify cluster state. Please run this command on a manager node or promote the current node to a manager.")
}
// GetServices returns all services of a managed swarm cluster.
func (c *Cluster) GetServices(options apitypes.ServiceListOptions) ([]types.Service, error) {
c.RLock()
defer c.RUnlock()
if !c.isActiveManager() {
return nil, ErrNoManager
return nil, c.errNoManager()
}
filters, err := newListServicesFilters(options.Filter)
@ -664,7 +673,7 @@ func (c *Cluster) CreateService(s types.ServiceSpec) (string, error) {
defer c.RUnlock()
if !c.isActiveManager() {
return "", ErrNoManager
return "", c.errNoManager()
}
ctx := c.getRequestContext()
@ -692,7 +701,7 @@ func (c *Cluster) GetService(input string) (types.Service, error) {
defer c.RUnlock()
if !c.isActiveManager() {
return types.Service{}, ErrNoManager
return types.Service{}, c.errNoManager()
}
service, err := getService(c.getRequestContext(), c.client, input)
@ -708,7 +717,7 @@ func (c *Cluster) UpdateService(serviceID string, version uint64, spec types.Ser
defer c.RUnlock()
if !c.isActiveManager() {
return ErrNoManager
return c.errNoManager()
}
serviceSpec, err := convert.ServiceSpecToGRPC(spec)
@ -735,7 +744,7 @@ func (c *Cluster) RemoveService(input string) error {
defer c.RUnlock()
if !c.isActiveManager() {
return ErrNoManager
return c.errNoManager()
}
service, err := getService(c.getRequestContext(), c.client, input)
@ -755,7 +764,7 @@ func (c *Cluster) GetNodes(options apitypes.NodeListOptions) ([]types.Node, erro
defer c.RUnlock()
if !c.isActiveManager() {
return nil, ErrNoManager
return nil, c.errNoManager()
}
filters, err := newListNodesFilters(options.Filter)
@ -783,7 +792,7 @@ func (c *Cluster) GetNode(input string) (types.Node, error) {
defer c.RUnlock()
if !c.isActiveManager() {
return types.Node{}, ErrNoManager
return types.Node{}, c.errNoManager()
}
node, err := getNode(c.getRequestContext(), c.client, input)
@ -799,7 +808,7 @@ func (c *Cluster) UpdateNode(nodeID string, version uint64, spec types.NodeSpec)
defer c.RUnlock()
if !c.isActiveManager() {
return ErrNoManager
return c.errNoManager()
}
nodeSpec, err := convert.NodeSpecToGRPC(spec)
@ -826,7 +835,7 @@ func (c *Cluster) RemoveNode(input string) error {
defer c.RUnlock()
if !c.isActiveManager() {
return ErrNoManager
return c.errNoManager()
}
ctx := c.getRequestContext()
@ -848,7 +857,7 @@ func (c *Cluster) GetTasks(options apitypes.TaskListOptions) ([]types.Task, erro
defer c.RUnlock()
if !c.isActiveManager() {
return nil, ErrNoManager
return nil, c.errNoManager()
}
filters, err := newListTasksFilters(options.Filter)
@ -876,7 +885,7 @@ func (c *Cluster) GetTask(input string) (types.Task, error) {
defer c.RUnlock()
if !c.isActiveManager() {
return types.Task{}, ErrNoManager
return types.Task{}, c.errNoManager()
}
task, err := getTask(c.getRequestContext(), c.client, input)
@ -892,7 +901,7 @@ func (c *Cluster) GetNetwork(input string) (apitypes.NetworkResource, error) {
defer c.RUnlock()
if !c.isActiveManager() {
return apitypes.NetworkResource{}, ErrNoManager
return apitypes.NetworkResource{}, c.errNoManager()
}
network, err := getNetwork(c.getRequestContext(), c.client, input)
@ -908,7 +917,7 @@ func (c *Cluster) GetNetworks() ([]apitypes.NetworkResource, error) {
defer c.RUnlock()
if !c.isActiveManager() {
return nil, ErrNoManager
return nil, c.errNoManager()
}
r, err := c.client.ListNetworks(c.getRequestContext(), &swarmapi.ListNetworksRequest{})
@ -931,7 +940,7 @@ func (c *Cluster) CreateNetwork(s apitypes.NetworkCreateRequest) (string, error)
defer c.RUnlock()
if !c.isActiveManager() {
return "", ErrNoManager
return "", c.errNoManager()
}
if runconfig.IsPreDefinedNetwork(s.Name) {
@ -954,7 +963,7 @@ func (c *Cluster) RemoveNetwork(input string) error {
defer c.RUnlock()
if !c.isActiveManager() {
return ErrNoManager
return c.errNoManager()
}
network, err := getNetwork(c.getRequestContext(), c.client, input)