open-consul/agent/consul/federation_state_endpoint.go

202 lines
5.2 KiB
Go

package consul
import (
"errors"
"fmt"
"time"
metrics "github.com/armon/go-metrics"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
memdb "github.com/hashicorp/go-memdb"
)
var (
errFederationStatesNotEnabled = errors.New("Federation states are currently disabled until all servers in the datacenter support the feature")
)
// FederationState endpoint is used to manipulate federation states from all
// datacenters.
type FederationState struct {
srv *Server
}
func (c *FederationState) Apply(args *structs.FederationStateRequest, reply *bool) error {
// Ensure that all federation state writes go to the primary datacenter. These will then
// be replicated to all the other datacenters.
args.Datacenter = c.srv.config.PrimaryDatacenter
if done, err := c.srv.forward("FederationState.Apply", args, args, reply); done {
return err
}
if !c.srv.DatacenterSupportsFederationStates() {
return errFederationStatesNotEnabled
}
defer metrics.MeasureSince([]string{"federation_state", "apply"}, time.Now())
// Fetch the ACL token, if any.
rule, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
if rule != nil && rule.OperatorWrite(nil) != acl.Allow {
return acl.ErrPermissionDenied
}
if args.State == nil || args.State.Datacenter == "" {
return fmt.Errorf("invalid request: missing federation state datacenter")
}
switch args.Op {
case structs.FederationStateUpsert:
if args.State.UpdatedAt.IsZero() {
args.State.UpdatedAt = time.Now().UTC()
}
case structs.FederationStateDelete:
// No validation required.
default:
return fmt.Errorf("Invalid federation state operation: %v", args.Op)
}
resp, err := c.srv.raftApply(structs.FederationStateRequestType, args)
if err != nil {
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
if respBool, ok := resp.(bool); ok {
*reply = respBool
}
return nil
}
func (c *FederationState) Get(args *structs.FederationStateQuery, reply *structs.FederationStateResponse) error {
if done, err := c.srv.forward("FederationState.Get", args, args, reply); done {
return err
}
if !c.srv.DatacenterSupportsFederationStates() {
return errFederationStatesNotEnabled
}
defer metrics.MeasureSince([]string{"federation_state", "get"}, time.Now())
// Fetch the ACL token, if any.
rule, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
if rule != nil && rule.OperatorRead(nil) != acl.Allow {
return acl.ErrPermissionDenied
}
return c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, fedState, err := state.FederationStateGet(ws, args.Datacenter)
if err != nil {
return err
}
reply.Index = index
if fedState == nil {
return nil
}
reply.State = fedState
return nil
})
}
// List is the endpoint meant to be used by consul servers performing
// replication.
func (c *FederationState) List(args *structs.DCSpecificRequest, reply *structs.IndexedFederationStates) error {
if done, err := c.srv.forward("FederationState.List", args, args, reply); done {
return err
}
if !c.srv.DatacenterSupportsFederationStates() {
return errFederationStatesNotEnabled
}
defer metrics.MeasureSince([]string{"federation_state", "list"}, time.Now())
// Fetch the ACL token, if any.
rule, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
if rule != nil && rule.OperatorRead(nil) != acl.Allow {
return acl.ErrPermissionDenied
}
return c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, fedStates, err := state.FederationStateList(ws)
if err != nil {
return err
}
if len(fedStates) == 0 {
fedStates = []*structs.FederationState{}
}
reply.Index = index
reply.States = fedStates
return nil
})
}
// ListMeshGateways is the endpoint meant to be used by proxies only interested
// in the discovery info for dialing mesh gateways. Analogous to catalog
// endpoints.
func (c *FederationState) ListMeshGateways(args *structs.DCSpecificRequest, reply *structs.DatacenterIndexedCheckServiceNodes) error {
if done, err := c.srv.forward("FederationState.ListMeshGateways", args, args, reply); done {
return err
}
if !c.srv.DatacenterSupportsFederationStates() {
return errFederationStatesNotEnabled
}
defer metrics.MeasureSince([]string{"federation_state", "list_mesh_gateways"}, time.Now())
return c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, fedStates, err := state.FederationStateList(ws)
if err != nil {
return err
}
dump := make(map[string]structs.CheckServiceNodes)
for i := range fedStates {
fedState := fedStates[i]
csn := fedState.MeshGateways
if len(csn) > 0 {
// We shallow clone this slice so that the filterACL doesn't
// end up manipulating the slice in memdb.
dump[fedState.Datacenter] = csn.ShallowClone()
}
}
reply.Index, reply.DatacenterNodes = index, dump
if err := c.srv.filterACL(args.Token, reply); err != nil {
return err
}
return nil
})
}