open-consul/agent/consul/discovery_chain_endpoint.go

104 lines
2.7 KiB
Go

package consul
import (
"errors"
"fmt"
"time"
metrics "github.com/armon/go-metrics"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/agent/consul/discoverychain"
"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
memdb "github.com/hashicorp/go-memdb"
)
type DiscoveryChain struct {
srv *Server
}
func (c *DiscoveryChain) Get(args *structs.DiscoveryChainRequest, reply *structs.DiscoveryChainResponse) error {
// Exit early if Connect hasn't been enabled.
if !c.srv.config.ConnectEnabled {
return ErrConnectNotEnabled
}
if done, err := c.srv.forward("DiscoveryChain.Get", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"discovery_chain", "get"}, time.Now())
// Fetch the ACL token, if any.
rule, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
// TODO (namespaces) use actual ent authz context
if rule != nil && rule.ServiceRead(args.Name, nil) != acl.Allow {
return acl.ErrPermissionDenied
}
if args.Name == "" {
return fmt.Errorf("Must provide service name")
}
evalDC := args.EvaluateInDatacenter
if evalDC == "" {
evalDC = c.srv.config.Datacenter
}
evalNS := args.EvaluateInNamespace
if evalNS == "" {
// TODO(namespaces) pull from something else?
evalNS = "default"
}
return c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, entries, err := state.ReadDiscoveryChainConfigEntries(ws, args.Name)
if err != nil {
return err
}
_, config, err := state.CAConfig(ws)
if err != nil {
return err
} else if config == nil {
return errors.New("no cluster ca config setup")
}
// Build TrustDomain based on the ClusterID stored.
signingID := connect.SpiffeIDSigningForCluster(config)
if signingID == nil {
// If CA is bootstrapped at all then this should never happen but be
// defensive.
return errors.New("no cluster trust domain setup")
}
currentTrustDomain := signingID.Host()
// Then we compile it into something useful.
chain, err := discoverychain.Compile(discoverychain.CompileRequest{
ServiceName: args.Name,
EvaluateInNamespace: evalNS,
EvaluateInDatacenter: evalDC,
EvaluateInTrustDomain: currentTrustDomain,
UseInDatacenter: c.srv.config.Datacenter,
OverrideMeshGateway: args.OverrideMeshGateway,
OverrideProtocol: args.OverrideProtocol,
OverrideConnectTimeout: args.OverrideConnectTimeout,
Entries: entries,
})
if err != nil {
return err
}
reply.Index = index
reply.Chain = chain
return nil
})
}