open-consul/consul/catalog_endpoint.go

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package consul
import (
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"fmt"
"sort"
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"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/consul/consul/structs"
)
// Catalog endpoint is used to manipulate the service catalog
type Catalog struct {
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srv *Server
}
// Register is used register that a node is providing a given service.
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func (c *Catalog) Register(args *structs.RegisterRequest, reply *struct{}) error {
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if done, err := c.srv.forward("Catalog.Register", args, args, reply); done {
return err
}
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defer metrics.MeasureSince([]string{"consul", "catalog", "register"}, time.Now())
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// Verify the args
if args.Node == "" || args.Address == "" {
return fmt.Errorf("Must provide node and address")
}
if args.Service != nil {
// If no service id, but service name, use default
if args.Service.ID == "" && args.Service.Service != "" {
args.Service.ID = args.Service.Service
}
// Verify ServiceName provided if ID
if args.Service.ID != "" && args.Service.Service == "" {
return fmt.Errorf("Must provide service name with ID")
}
// Apply the ACL policy if any
// The 'consul' service is excluded since it is managed
// automatically internally.
if args.Service.Service != ConsulServiceName {
acl, err := c.srv.resolveToken(args.Token)
if err != nil {
return err
} else if acl != nil && !acl.ServiceWrite(args.Service.Service) {
c.srv.logger.Printf("[WARN] consul.catalog: Register of service '%s' on '%s' denied due to ACLs",
args.Service.Service, args.Node)
return permissionDeniedErr
}
}
}
if args.Check != nil {
args.Checks = append(args.Checks, args.Check)
args.Check = nil
}
for _, check := range args.Checks {
if check.CheckID == "" && check.Name != "" {
check.CheckID = check.Name
}
if check.Node == "" {
check.Node = args.Node
}
}
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_, err := c.srv.raftApply(structs.RegisterRequestType, args)
if err != nil {
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c.srv.logger.Printf("[ERR] consul.catalog: Register failed: %v", err)
return err
}
return nil
}
// Deregister is used to remove a service registration for a given node.
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func (c *Catalog) Deregister(args *structs.DeregisterRequest, reply *struct{}) error {
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if done, err := c.srv.forward("Catalog.Deregister", args, args, reply); done {
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return err
}
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defer metrics.MeasureSince([]string{"consul", "catalog", "deregister"}, time.Now())
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// Verify the args
if args.Node == "" {
return fmt.Errorf("Must provide node")
}
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_, err := c.srv.raftApply(structs.DeregisterRequestType, args)
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if err != nil {
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c.srv.logger.Printf("[ERR] consul.catalog: Deregister failed: %v", err)
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return err
}
return nil
}
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// ListDatacenters is used to query for the list of known datacenters
func (c *Catalog) ListDatacenters(args *struct{}, reply *[]string) error {
c.srv.remoteLock.RLock()
defer c.srv.remoteLock.RUnlock()
// Read the known DCs
var dcs []string
for dc := range c.srv.remoteConsuls {
dcs = append(dcs, dc)
}
// TODO - do we want to control the sort behavior with an argument?
// Sort the DCs by name first, then apply a stable sort by distance.
sort.Strings(dcs)
if err := c.srv.sortDatacentersByDistance(dcs); err != nil {
return err
}
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// Return
*reply = dcs
return nil
}
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// ListNodes is used to query the nodes in a DC
func (c *Catalog) ListNodes(args *structs.DCSpecificRequest, reply *structs.IndexedNodes) error {
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if done, err := c.srv.forward("Catalog.ListNodes", args, args, reply); done {
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return err
}
// Get the list of nodes.
state := c.srv.fsm.State()
return c.srv.blockingRPC(
&args.QueryOptions,
&reply.QueryMeta,
state.GetQueryWatch("Nodes"),
func() error {
index, nodes, err := state.Nodes()
if err != nil {
return err
}
reply.Index, reply.Nodes = index, nodes
return c.srv.sortNodesByDistanceFrom(args.Source, reply.Nodes)
})
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}
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// ListServices is used to query the services in a DC
func (c *Catalog) ListServices(args *structs.DCSpecificRequest, reply *structs.IndexedServices) error {
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if done, err := c.srv.forward("Catalog.ListServices", args, args, reply); done {
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return err
}
// Get the list of services and their tags.
state := c.srv.fsm.State()
return c.srv.blockingRPC(
&args.QueryOptions,
&reply.QueryMeta,
state.GetQueryWatch("Services"),
func() error {
index, services, err := state.Services()
if err != nil {
return err
}
reply.Index, reply.Services = index, services
return c.srv.filterACL(args.Token, reply)
})
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}
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// ServiceNodes returns all the nodes registered as part of a service
func (c *Catalog) ServiceNodes(args *structs.ServiceSpecificRequest, reply *structs.IndexedServiceNodes) error {
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if done, err := c.srv.forward("Catalog.ServiceNodes", args, args, reply); done {
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return err
}
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// Verify the arguments
if args.ServiceName == "" {
return fmt.Errorf("Must provide service name")
}
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// Get the nodes
state := c.srv.fsm.State()
err := c.srv.blockingRPC(
&args.QueryOptions,
&reply.QueryMeta,
state.GetQueryWatch("ServiceNodes"),
func() error {
var index uint64
var services structs.ServiceNodes
var err error
if args.TagFilter {
index, services, err = state.ServiceTagNodes(args.ServiceName, args.ServiceTag)
} else {
index, services, err = state.ServiceNodes(args.ServiceName)
}
if err != nil {
return err
}
reply.Index, reply.ServiceNodes = index, services
if err := c.srv.filterACL(args.Token, reply); err != nil {
return err
}
return c.srv.sortNodesByDistanceFrom(args.Source, reply.ServiceNodes)
})
// Provide some metrics
if err == nil {
metrics.IncrCounter([]string{"consul", "catalog", "service", "query", args.ServiceName}, 1)
if args.ServiceTag != "" {
metrics.IncrCounter([]string{"consul", "catalog", "service", "query-tag", args.ServiceName, args.ServiceTag}, 1)
}
if len(reply.ServiceNodes) == 0 {
metrics.IncrCounter([]string{"consul", "catalog", "service", "not-found", args.ServiceName}, 1)
}
}
return err
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}
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// NodeServices returns all the services registered as part of a node
func (c *Catalog) NodeServices(args *structs.NodeSpecificRequest, reply *structs.IndexedNodeServices) error {
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if done, err := c.srv.forward("Catalog.NodeServices", args, args, reply); done {
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return err
}
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// Verify the arguments
if args.Node == "" {
return fmt.Errorf("Must provide node")
}
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// Get the node services
state := c.srv.fsm.State()
return c.srv.blockingRPC(
&args.QueryOptions,
&reply.QueryMeta,
state.GetQueryWatch("NodeServices"),
func() error {
index, services, err := state.NodeServices(args.Node)
if err != nil {
return err
}
reply.Index, reply.NodeServices = index, services
return c.srv.filterACL(args.Token, reply)
})
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}