package consul import ( "fmt" "sort" "time" "github.com/armon/go-metrics" "github.com/hashicorp/consul/acl" "github.com/hashicorp/consul/agent/consul/state" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/ipaddr" "github.com/hashicorp/consul/types" "github.com/hashicorp/go-memdb" "github.com/hashicorp/go-uuid" ) // Catalog endpoint is used to manipulate the service catalog type Catalog struct { srv *Server } // Register is used register that a node is providing a given service. func (c *Catalog) Register(args *structs.RegisterRequest, reply *struct{}) error { if done, err := c.srv.forward("Catalog.Register", args, args, reply); done { return err } defer metrics.MeasureSince([]string{"catalog", "register"}, time.Now()) // Verify the args. if args.Node == "" { return fmt.Errorf("Must provide node") } if args.Address == "" && !args.SkipNodeUpdate { return fmt.Errorf("Must provide address if SkipNodeUpdate is not set") } if args.ID != "" { if _, err := uuid.ParseUUID(string(args.ID)); err != nil { return fmt.Errorf("Bad node ID: %v", err) } } // Fetch the ACL token, if any. rule, err := c.srv.ResolveToken(args.Token) if err != nil { return err } // Handle a service registration. if args.Service != nil { // Validate the service. This is in addition to the below since // the above just hasn't been moved over yet. We should move it over // in time. if err := args.Service.Validate(); err != nil { return err } // 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") } // Check the service address here and in the agent endpoint // since service registration isn't synchronous. if ipaddr.IsAny(args.Service.Address) { return fmt.Errorf("Invalid service address") } // Apply the ACL policy if any. The 'consul' service is excluded // since it is managed automatically internally (that behavior // is going away after version 0.8). We check this same policy // later if version 0.8 is enabled, so we can eventually just // delete this and do all the ACL checks down there. if args.Service.Service != structs.ConsulServiceName { if rule != nil && !rule.ServiceWrite(args.Service.Service, nil) { return acl.ErrPermissionDenied } } // Proxies must have write permission on their destination if args.Service.Kind == structs.ServiceKindConnectProxy { if rule != nil && !rule.ServiceWrite(args.Service.Proxy.DestinationServiceName, nil) { return acl.ErrPermissionDenied } } } // Move the old format single check into the slice, and fixup IDs. 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 = types.CheckID(check.Name) } if check.Node == "" { check.Node = args.Node } } // Check the complete register request against the given ACL policy. if rule != nil && c.srv.config.ACLEnforceVersion8 { state := c.srv.fsm.State() _, ns, err := state.NodeServices(nil, args.Node) if err != nil { return fmt.Errorf("Node lookup failed: %v", err) } if err := vetRegisterWithACL(rule, args, ns); err != nil { return err } } resp, err := c.srv.raftApply(structs.RegisterRequestType, args) if err != nil { return err } if respErr, ok := resp.(error); ok { return respErr } return nil } // Deregister is used to remove a service registration for a given node. func (c *Catalog) Deregister(args *structs.DeregisterRequest, reply *struct{}) error { if done, err := c.srv.forward("Catalog.Deregister", args, args, reply); done { return err } defer metrics.MeasureSince([]string{"catalog", "deregister"}, time.Now()) // Verify the args if args.Node == "" { return fmt.Errorf("Must provide node") } // Fetch the ACL token, if any. rule, err := c.srv.ResolveToken(args.Token) if err != nil { return err } // Check the complete deregister request against the given ACL policy. if rule != nil && c.srv.config.ACLEnforceVersion8 { state := c.srv.fsm.State() var ns *structs.NodeService if args.ServiceID != "" { _, ns, err = state.NodeService(args.Node, args.ServiceID) if err != nil { return fmt.Errorf("Service lookup failed: %v", err) } } var nc *structs.HealthCheck if args.CheckID != "" { _, nc, err = state.NodeCheck(args.Node, args.CheckID) if err != nil { return fmt.Errorf("Check lookup failed: %v", err) } } if err := vetDeregisterWithACL(rule, args, ns, nc); err != nil { return err } } if _, err := c.srv.raftApply(structs.DeregisterRequestType, args); err != nil { return err } return nil } // ListDatacenters is used to query for the list of known datacenters func (c *Catalog) ListDatacenters(args *struct{}, reply *[]string) error { dcs, err := c.srv.router.GetDatacentersByDistance() if err != nil { return err } if len(dcs) == 0 { // no WAN federation, so return the local data center name dcs = []string{c.srv.config.Datacenter} } *reply = dcs return nil } // ListNodes is used to query the nodes in a DC func (c *Catalog) ListNodes(args *structs.DCSpecificRequest, reply *structs.IndexedNodes) error { if done, err := c.srv.forward("Catalog.ListNodes", args, args, reply); done { return err } return c.srv.blockingQuery( &args.QueryOptions, &reply.QueryMeta, func(ws memdb.WatchSet, state *state.Store) error { var index uint64 var nodes structs.Nodes var err error if len(args.NodeMetaFilters) > 0 { index, nodes, err = state.NodesByMeta(ws, args.NodeMetaFilters) } else { index, nodes, err = state.Nodes(ws) } if err != nil { return err } reply.Index, reply.Nodes = index, nodes if err := c.srv.filterACL(args.Token, reply); err != nil { return err } return c.srv.sortNodesByDistanceFrom(args.Source, reply.Nodes) }) } // ListServices is used to query the services in a DC func (c *Catalog) ListServices(args *structs.DCSpecificRequest, reply *structs.IndexedServices) error { if done, err := c.srv.forward("Catalog.ListServices", args, args, reply); done { return err } return c.srv.blockingQuery( &args.QueryOptions, &reply.QueryMeta, func(ws memdb.WatchSet, state *state.Store) error { var index uint64 var services structs.Services var err error if len(args.NodeMetaFilters) > 0 { index, services, err = state.ServicesByNodeMeta(ws, args.NodeMetaFilters) } else { index, services, err = state.Services(ws) } if err != nil { return err } reply.Index, reply.Services = index, services return c.srv.filterACL(args.Token, reply) }) } // ServiceNodes returns all the nodes registered as part of a service func (c *Catalog) ServiceNodes(args *structs.ServiceSpecificRequest, reply *structs.IndexedServiceNodes) error { if done, err := c.srv.forward("Catalog.ServiceNodes", args, args, reply); done { return err } // Verify the arguments if args.ServiceName == "" && args.ServiceAddress == "" { return fmt.Errorf("Must provide service name") } // Determine the function we'll call var f func(memdb.WatchSet, *state.Store) (uint64, structs.ServiceNodes, error) switch { case args.Connect: f = func(ws memdb.WatchSet, s *state.Store) (uint64, structs.ServiceNodes, error) { return s.ConnectServiceNodes(ws, args.ServiceName) } default: f = func(ws memdb.WatchSet, s *state.Store) (uint64, structs.ServiceNodes, error) { if args.ServiceAddress != "" { return s.ServiceAddressNodes(ws, args.ServiceAddress) } if args.TagFilter { tags := args.ServiceTags // Agents < v1.3.0 and DNS service lookups populate the ServiceTag field. In this case, // use ServiceTag instead of the ServiceTags field. if args.ServiceTag != "" { tags = []string{args.ServiceTag} } return s.ServiceTagNodes(ws, args.ServiceName, tags) } return s.ServiceNodes(ws, args.ServiceName) } } // If we're doing a connect query, we need read access to the service // we're trying to find proxies for, so check that. if args.Connect { // Fetch the ACL token, if any. rule, err := c.srv.ResolveToken(args.Token) if err != nil { return err } if rule != nil && !rule.ServiceRead(args.ServiceName) { // Just return nil, which will return an empty response (tested) return nil } } err := c.srv.blockingQuery( &args.QueryOptions, &reply.QueryMeta, func(ws memdb.WatchSet, state *state.Store) error { index, services, err := f(ws, state) if err != nil { return err } reply.Index, reply.ServiceNodes = index, services if len(args.NodeMetaFilters) > 0 { var filtered structs.ServiceNodes for _, service := range services { if structs.SatisfiesMetaFilters(service.NodeMeta, args.NodeMetaFilters) { filtered = append(filtered, service) } } reply.ServiceNodes = filtered } 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 { // For metrics, we separate Connect-based lookups from non-Connect key := "service" if args.Connect { key = "connect" } metrics.IncrCounterWithLabels([]string{"catalog", key, "query"}, 1, []metrics.Label{{Name: "service", Value: args.ServiceName}}) if args.ServiceTag != "" { metrics.IncrCounterWithLabels([]string{"catalog", key, "query-tag"}, 1, []metrics.Label{{Name: "service", Value: args.ServiceName}, {Name: "tag", Value: args.ServiceTag}}) } if len(args.ServiceTags) > 0 { // Sort tags so that the metric is the same even if the request // tags are in a different order sort.Strings(args.ServiceTags) // Build metric labels labels := []metrics.Label{{Name: "service", Value: args.ServiceName}} for _, tag := range args.ServiceTags { labels = append(labels, metrics.Label{Name: "tag", Value: tag}) } metrics.IncrCounterWithLabels([]string{"catalog", key, "query-tags"}, 1, labels) } if len(reply.ServiceNodes) == 0 { metrics.IncrCounterWithLabels([]string{"catalog", key, "not-found"}, 1, []metrics.Label{{Name: "service", Value: args.ServiceName}}) } } return err } // NodeServices returns all the services registered as part of a node func (c *Catalog) NodeServices(args *structs.NodeSpecificRequest, reply *structs.IndexedNodeServices) error { if done, err := c.srv.forward("Catalog.NodeServices", args, args, reply); done { return err } // Verify the arguments if args.Node == "" { return fmt.Errorf("Must provide node") } return c.srv.blockingQuery( &args.QueryOptions, &reply.QueryMeta, func(ws memdb.WatchSet, state *state.Store) error { index, services, err := state.NodeServices(ws, args.Node) if err != nil { return err } reply.Index, reply.NodeServices = index, services return c.srv.filterACL(args.Token, reply) }) }