open-consul/agent/consul/state/config_entry.go

925 lines
26 KiB
Go

package state
import (
"fmt"
"github.com/hashicorp/consul/agent/consul/discoverychain"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/lib"
memdb "github.com/hashicorp/go-memdb"
)
const (
configTableName = "config-entries"
)
type ConfigEntryLinkIndex struct {
}
type discoveryChainConfigEntry interface {
structs.ConfigEntry
// ListRelatedServices returns a list of other names of services referenced
// in this config entry.
ListRelatedServices() []structs.ServiceID
}
func (s *ConfigEntryLinkIndex) FromObject(obj interface{}) (bool, [][]byte, error) {
entry, ok := obj.(structs.ConfigEntry)
if !ok {
return false, nil, fmt.Errorf("object is not a ConfigEntry")
}
dcEntry, ok := entry.(discoveryChainConfigEntry)
if !ok {
return false, nil, nil
}
linkedServices := dcEntry.ListRelatedServices()
numLinks := len(linkedServices)
if numLinks == 0 {
return false, nil, nil
}
vals := make([][]byte, 0, numLinks)
for _, linkedService := range linkedServices {
vals = append(vals, []byte(linkedService.String()+"\x00"))
}
return true, vals, nil
}
func (s *ConfigEntryLinkIndex) FromArgs(args ...interface{}) ([]byte, error) {
if len(args) != 1 {
return nil, fmt.Errorf("must provide only a single argument")
}
arg, ok := args[0].(structs.ServiceID)
if !ok {
return nil, fmt.Errorf("argument must be a structs.ServiceID: %#v", args[0])
}
// Add the null character as a terminator
return []byte(arg.String() + "\x00"), nil
}
func (s *ConfigEntryLinkIndex) PrefixFromArgs(args ...interface{}) ([]byte, error) {
val, err := s.FromArgs(args...)
if err != nil {
return nil, err
}
// Strip the null terminator, the rest is a prefix
n := len(val)
if n > 0 {
return val[:n-1], nil
}
return val, nil
}
func init() {
registerSchema(configTableSchema)
}
// ConfigEntries is used to pull all the config entries for the snapshot.
func (s *Snapshot) ConfigEntries() ([]structs.ConfigEntry, error) {
entries, err := s.tx.Get(configTableName, "id")
if err != nil {
return nil, err
}
var ret []structs.ConfigEntry
for wrapped := entries.Next(); wrapped != nil; wrapped = entries.Next() {
ret = append(ret, wrapped.(structs.ConfigEntry))
}
return ret, nil
}
// ConfigEntry is used when restoring from a snapshot.
func (s *Restore) ConfigEntry(c structs.ConfigEntry) error {
return s.store.insertConfigEntryWithTxn(s.tx, c.GetRaftIndex().ModifyIndex, c)
}
// ConfigEntry is called to get a given config entry.
func (s *Store) ConfigEntry(ws memdb.WatchSet, kind, name string, entMeta *structs.EnterpriseMeta) (uint64, structs.ConfigEntry, error) {
tx := s.db.Txn(false)
defer tx.Abort()
return s.configEntryTxn(tx, ws, kind, name, entMeta)
}
func (s *Store) configEntryTxn(tx *txn, ws memdb.WatchSet, kind, name string, entMeta *structs.EnterpriseMeta) (uint64, structs.ConfigEntry, error) {
// Get the index
idx := maxIndexTxn(tx, configTableName)
// Get the existing config entry.
watchCh, existing, err := s.firstWatchConfigEntryWithTxn(tx, kind, name, entMeta)
if err != nil {
return 0, nil, fmt.Errorf("failed config entry lookup: %s", err)
}
ws.Add(watchCh)
if existing == nil {
return idx, nil, nil
}
conf, ok := existing.(structs.ConfigEntry)
if !ok {
return 0, nil, fmt.Errorf("config entry %q (%s) is an invalid type: %T", name, kind, conf)
}
return idx, conf, nil
}
// ConfigEntries is called to get all config entry objects.
func (s *Store) ConfigEntries(ws memdb.WatchSet, entMeta *structs.EnterpriseMeta) (uint64, []structs.ConfigEntry, error) {
return s.ConfigEntriesByKind(ws, "", entMeta)
}
// ConfigEntriesByKind is called to get all config entry objects with the given kind.
// If kind is empty, all config entries will be returned.
func (s *Store) ConfigEntriesByKind(ws memdb.WatchSet, kind string, entMeta *structs.EnterpriseMeta) (uint64, []structs.ConfigEntry, error) {
tx := s.db.Txn(false)
defer tx.Abort()
return s.configEntriesByKindTxn(tx, ws, kind, entMeta)
}
func (s *Store) configEntriesByKindTxn(tx *txn, ws memdb.WatchSet, kind string, entMeta *structs.EnterpriseMeta) (uint64, []structs.ConfigEntry, error) {
// Get the index
idx := maxIndexTxn(tx, configTableName)
// Lookup by kind, or all if kind is empty
var iter memdb.ResultIterator
var err error
if kind != "" {
iter, err = getConfigEntryKindsWithTxn(tx, kind, entMeta)
} else {
iter, err = getAllConfigEntriesWithTxn(tx, entMeta)
}
if err != nil {
return 0, nil, fmt.Errorf("failed config entry lookup: %s", err)
}
ws.Add(iter.WatchCh())
var results []structs.ConfigEntry
for v := iter.Next(); v != nil; v = iter.Next() {
results = append(results, v.(structs.ConfigEntry))
}
return idx, results, nil
}
// EnsureConfigEntry is called to do an upsert of a given config entry.
func (s *Store) EnsureConfigEntry(idx uint64, conf structs.ConfigEntry, entMeta *structs.EnterpriseMeta) error {
tx := s.db.WriteTxn(idx)
defer tx.Abort()
if err := s.ensureConfigEntryTxn(tx, idx, conf, entMeta); err != nil {
return err
}
return tx.Commit()
}
// ensureConfigEntryTxn upserts a config entry inside of a transaction.
func (s *Store) ensureConfigEntryTxn(tx *txn, idx uint64, conf structs.ConfigEntry, entMeta *structs.EnterpriseMeta) error {
// Check for existing configuration.
existing, err := s.firstConfigEntryWithTxn(tx, conf.GetKind(), conf.GetName(), entMeta)
if err != nil {
return fmt.Errorf("failed configuration lookup: %s", err)
}
raftIndex := conf.GetRaftIndex()
if existing != nil {
existingIdx := existing.(structs.ConfigEntry).GetRaftIndex()
raftIndex.CreateIndex = existingIdx.CreateIndex
raftIndex.ModifyIndex = existingIdx.ModifyIndex
} else {
raftIndex.CreateIndex = idx
}
raftIndex.ModifyIndex = idx
err = s.validateProposedConfigEntryInGraph(
tx,
idx,
conf.GetKind(),
conf.GetName(),
conf,
entMeta,
)
if err != nil {
return err // Err is already sufficiently decorated.
}
if err := s.validateConfigEntryEnterprise(tx, conf); err != nil {
return err
}
return s.insertConfigEntryWithTxn(tx, idx, conf)
}
// EnsureConfigEntryCAS is called to do a check-and-set upsert of a given config entry.
func (s *Store) EnsureConfigEntryCAS(idx, cidx uint64, conf structs.ConfigEntry, entMeta *structs.EnterpriseMeta) (bool, error) {
tx := s.db.WriteTxn(idx)
defer tx.Abort()
// Check for existing configuration.
existing, err := s.firstConfigEntryWithTxn(tx, conf.GetKind(), conf.GetName(), entMeta)
if err != nil {
return false, fmt.Errorf("failed configuration lookup: %s", err)
}
// Check if the we should do the set. A ModifyIndex of 0 means that
// we are doing a set-if-not-exists.
var existingIdx structs.RaftIndex
if existing != nil {
existingIdx = *existing.(structs.ConfigEntry).GetRaftIndex()
}
if cidx == 0 && existing != nil {
return false, nil
}
if cidx != 0 && existing == nil {
return false, nil
}
if existing != nil && cidx != 0 && cidx != existingIdx.ModifyIndex {
return false, nil
}
if err := s.ensureConfigEntryTxn(tx, idx, conf, entMeta); err != nil {
return false, err
}
err = tx.Commit()
return err == nil, err
}
func (s *Store) DeleteConfigEntry(idx uint64, kind, name string, entMeta *structs.EnterpriseMeta) error {
tx := s.db.WriteTxn(idx)
defer tx.Abort()
// Try to retrieve the existing config entry.
existing, err := s.firstConfigEntryWithTxn(tx, kind, name, entMeta)
if err != nil {
return fmt.Errorf("failed config entry lookup: %s", err)
}
if existing == nil {
return nil
}
// If the config entry is for terminating or ingress gateways we delete entries from the memdb table
// that associates gateways <-> services.
if kind == structs.TerminatingGateway || kind == structs.IngressGateway {
if _, err := tx.DeleteAll(gatewayServicesTableName, "gateway", structs.NewServiceName(name, entMeta)); err != nil {
return fmt.Errorf("failed to truncate gateway services table: %v", err)
}
if err := indexUpdateMaxTxn(tx, idx, gatewayServicesTableName); err != nil {
return fmt.Errorf("failed updating gateway-services index: %v", err)
}
}
err = s.validateProposedConfigEntryInGraph(
tx,
idx,
kind,
name,
nil,
entMeta,
)
if err != nil {
return err // Err is already sufficiently decorated.
}
// Delete the config entry from the DB and update the index.
if err := tx.Delete(configTableName, existing); err != nil {
return fmt.Errorf("failed removing check: %s", err)
}
if err := tx.Insert("index", &IndexEntry{configTableName, idx}); err != nil {
return fmt.Errorf("failed updating index: %s", err)
}
return tx.Commit()
}
func (s *Store) insertConfigEntryWithTxn(tx *txn, idx uint64, conf structs.ConfigEntry) error {
if conf == nil {
return fmt.Errorf("cannot insert nil config entry")
}
// If the config entry is for a terminating or ingress gateway we update the memdb table
// that associates gateways <-> services.
if conf.GetKind() == structs.TerminatingGateway || conf.GetKind() == structs.IngressGateway {
err := s.updateGatewayServices(tx, idx, conf, conf.GetEnterpriseMeta())
if err != nil {
return fmt.Errorf("failed to associate services to gateway: %v", err)
}
}
// Insert the config entry and update the index
if err := tx.Insert(configTableName, conf); err != nil {
return fmt.Errorf("failed inserting config entry: %s", err)
}
if err := indexUpdateMaxTxn(tx, idx, configTableName); err != nil {
return fmt.Errorf("failed updating index: %v", err)
}
return nil
}
// validateProposedConfigEntryInGraph can be used to verify graph integrity for
// a proposed graph create/update/delete.
//
// This must be called before any mutations occur on the config entries table!
//
// May return *ConfigEntryGraphValidationError if there is a concern to surface
// to the caller that they can correct.
func (s *Store) validateProposedConfigEntryInGraph(
tx *txn,
idx uint64,
kind, name string,
next structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) error {
validateAllChains := false
switch kind {
case structs.ProxyDefaults:
if name != structs.ProxyConfigGlobal {
return nil
}
validateAllChains = true
case structs.ServiceDefaults:
case structs.ServiceRouter:
case structs.ServiceSplitter:
case structs.ServiceResolver:
case structs.IngressGateway:
err := s.checkGatewayClash(tx, name, structs.IngressGateway, structs.TerminatingGateway, entMeta)
if err != nil {
return err
}
err = s.validateProposedIngressProtocolsInServiceGraph(tx, next, entMeta)
if err != nil {
return err
}
case structs.TerminatingGateway:
err := s.checkGatewayClash(tx, name, structs.TerminatingGateway, structs.IngressGateway, entMeta)
if err != nil {
return err
}
default:
return fmt.Errorf("unhandled kind %q during validation of %q", kind, name)
}
return s.validateProposedConfigEntryInServiceGraph(tx, idx, kind, name, next, validateAllChains, entMeta)
}
func (s *Store) checkGatewayClash(
tx *txn,
name, selfKind, otherKind string,
entMeta *structs.EnterpriseMeta,
) error {
_, entry, err := s.configEntryTxn(tx, nil, otherKind, name, entMeta)
if err != nil {
return err
}
if entry != nil {
return fmt.Errorf("cannot create a %q config entry with name %q, "+
"a %q config entry with that name already exists", selfKind, name, otherKind)
}
return nil
}
var serviceGraphKinds = []string{
structs.ServiceRouter,
structs.ServiceSplitter,
structs.ServiceResolver,
}
func (s *Store) validateProposedConfigEntryInServiceGraph(
tx *txn,
idx uint64,
kind, name string,
next structs.ConfigEntry,
validateAllChains bool,
entMeta *structs.EnterpriseMeta,
) error {
// Collect all of the chains that could be affected by this change
// including our own.
checkChains := make(map[structs.ServiceID]struct{})
if validateAllChains {
// Must be proxy-defaults/global.
// Check anything that has a discovery chain entry. In the future we could
// somehow omit the ones that have a default protocol configured.
for _, kind := range serviceGraphKinds {
_, entries, err := s.configEntriesByKindTxn(tx, nil, kind, structs.WildcardEnterpriseMeta())
if err != nil {
return err
}
for _, entry := range entries {
checkChains[structs.NewServiceID(entry.GetName(), entry.GetEnterpriseMeta())] = struct{}{}
}
}
} else {
// Must be a single chain.
sid := structs.NewServiceID(name, entMeta)
checkChains[sid] = struct{}{}
iter, err := tx.Get(configTableName, "link", sid)
for raw := iter.Next(); raw != nil; raw = iter.Next() {
entry := raw.(structs.ConfigEntry)
checkChains[structs.NewServiceID(entry.GetName(), entry.GetEnterpriseMeta())] = struct{}{}
}
if err != nil {
return err
}
}
overrides := map[structs.ConfigEntryKindName]structs.ConfigEntry{
{Kind: kind, Name: name}: next,
}
for chain := range checkChains {
if err := s.testCompileDiscoveryChain(tx, nil, chain.ID, overrides, &chain.EnterpriseMeta); err != nil {
return err
}
}
return nil
}
func (s *Store) testCompileDiscoveryChain(
tx *txn,
ws memdb.WatchSet,
chainName string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) error {
_, speculativeEntries, err := s.readDiscoveryChainConfigEntriesTxn(tx, nil, chainName, overrides, entMeta)
if err != nil {
return err
}
// Note we use an arbitrary namespace and datacenter as those would not
// currently affect the graph compilation in ways that matter here.
//
// TODO(rb): we should thread a better value than "dc1" and the throwaway trust domain down here as that is going to sometimes show up in user facing errors
req := discoverychain.CompileRequest{
ServiceName: chainName,
EvaluateInNamespace: entMeta.NamespaceOrDefault(),
EvaluateInDatacenter: "dc1",
EvaluateInTrustDomain: "b6fc9da3-03d4-4b5a-9134-c045e9b20152.consul",
UseInDatacenter: "dc1",
Entries: speculativeEntries,
}
_, err = discoverychain.Compile(req)
return err
}
// ReadDiscoveryChainConfigEntries will query for the full discovery chain for
// the provided service name. All relevant config entries will be recursively
// fetched and included in the result.
//
// Once returned, the caller still needs to assemble these into a useful graph
// structure.
func (s *Store) ReadDiscoveryChainConfigEntries(
ws memdb.WatchSet,
serviceName string,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.DiscoveryChainConfigEntries, error) {
return s.readDiscoveryChainConfigEntries(ws, serviceName, nil, entMeta)
}
// readDiscoveryChainConfigEntries will query for the full discovery chain for
// the provided service name. All relevant config entries will be recursively
// fetched and included in the result.
//
// If 'overrides' is provided then it will use entries in that map instead of
// the database to simulate the entries that go into a modified discovery chain
// without actually modifying it yet. Nil values are tombstones to simulate
// deleting an entry.
//
// Overrides is not mutated.
func (s *Store) readDiscoveryChainConfigEntries(
ws memdb.WatchSet,
serviceName string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.DiscoveryChainConfigEntries, error) {
tx := s.db.Txn(false)
defer tx.Abort()
return s.readDiscoveryChainConfigEntriesTxn(tx, ws, serviceName, overrides, entMeta)
}
func (s *Store) readDiscoveryChainConfigEntriesTxn(
tx *txn,
ws memdb.WatchSet,
serviceName string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.DiscoveryChainConfigEntries, error) {
res := structs.NewDiscoveryChainConfigEntries()
// Note that below we always look up splitters and resolvers in pairs, even
// in some circumstances where both are not strictly necessary.
//
// For now we'll just eat the cost of fetching pairs of splitter/resolver
// config entries even though we may not always need both. In the common
// case we will need the pair so there's not a big drive to optimize this
// here at this time.
// Both Splitters and Resolvers maps will contain placeholder nils until
// the end of this function to indicate "no such entry".
var (
todoSplitters = make(map[structs.ServiceID]struct{})
todoResolvers = make(map[structs.ServiceID]struct{})
todoDefaults = make(map[structs.ServiceID]struct{})
)
sid := structs.NewServiceID(serviceName, entMeta)
// Grab the proxy defaults if they exist.
idx, proxy, err := s.getProxyConfigEntryTxn(tx, ws, structs.ProxyConfigGlobal, overrides, structs.DefaultEnterpriseMeta())
if err != nil {
return 0, nil, err
} else if proxy != nil {
res.GlobalProxy = proxy
}
// At every step we'll need service defaults.
todoDefaults[sid] = struct{}{}
// first fetch the router, of which we only collect 1 per chain eval
_, router, err := s.getRouterConfigEntryTxn(tx, ws, serviceName, overrides, entMeta)
if err != nil {
return 0, nil, err
} else if router != nil {
res.Routers[sid] = router
}
if router != nil {
for _, svc := range router.ListRelatedServices() {
todoSplitters[svc] = struct{}{}
}
} else {
// Next hop in the chain is the splitter.
todoSplitters[sid] = struct{}{}
}
for {
splitID, ok := anyKey(todoSplitters)
if !ok {
break
}
delete(todoSplitters, splitID)
if _, ok := res.Splitters[splitID]; ok {
continue // already fetched
}
// Yes, even for splitters.
todoDefaults[splitID] = struct{}{}
_, splitter, err := s.getSplitterConfigEntryTxn(tx, ws, splitID.ID, overrides, &splitID.EnterpriseMeta)
if err != nil {
return 0, nil, err
}
if splitter == nil {
res.Splitters[splitID] = nil
// Next hop in the chain is the resolver.
todoResolvers[splitID] = struct{}{}
continue
}
res.Splitters[splitID] = splitter
todoResolvers[splitID] = struct{}{}
for _, svc := range splitter.ListRelatedServices() {
// If there is no splitter, this will end up adding a resolver
// after another iteration.
todoSplitters[svc] = struct{}{}
}
}
for {
resolverID, ok := anyKey(todoResolvers)
if !ok {
break
}
delete(todoResolvers, resolverID)
if _, ok := res.Resolvers[resolverID]; ok {
continue // already fetched
}
// And resolvers, too.
todoDefaults[resolverID] = struct{}{}
_, resolver, err := s.getResolverConfigEntryTxn(tx, ws, resolverID.ID, overrides, &resolverID.EnterpriseMeta)
if err != nil {
return 0, nil, err
}
if resolver == nil {
res.Resolvers[resolverID] = nil
continue
}
res.Resolvers[resolverID] = resolver
for _, svc := range resolver.ListRelatedServices() {
todoResolvers[svc] = struct{}{}
}
}
for {
svcID, ok := anyKey(todoDefaults)
if !ok {
break
}
delete(todoDefaults, svcID)
if _, ok := res.Services[svcID]; ok {
continue // already fetched
}
_, entry, err := s.getServiceConfigEntryTxn(tx, ws, svcID.ID, overrides, &svcID.EnterpriseMeta)
if err != nil {
return 0, nil, err
}
if entry == nil {
res.Services[svcID] = nil
continue
}
res.Services[svcID] = entry
}
// Strip nils now that they are no longer necessary.
for sid, entry := range res.Routers {
if entry == nil {
delete(res.Routers, sid)
}
}
for sid, entry := range res.Splitters {
if entry == nil {
delete(res.Splitters, sid)
}
}
for sid, entry := range res.Resolvers {
if entry == nil {
delete(res.Resolvers, sid)
}
}
for sid, entry := range res.Services {
if entry == nil {
delete(res.Services, sid)
}
}
return idx, res, nil
}
// anyKey returns any key from the provided map if any exist. Useful for using
// a map as a simple work queue of sorts.
func anyKey(m map[structs.ServiceID]struct{}) (structs.ServiceID, bool) {
if len(m) == 0 {
return structs.ServiceID{}, false
}
for k := range m {
return k, true
}
return structs.ServiceID{}, false
}
// getProxyConfigEntryTxn is a convenience method for fetching a
// proxy-defaults kind of config entry.
//
// If an override is returned the index returned will be 0.
func (s *Store) getProxyConfigEntryTxn(
tx *txn,
ws memdb.WatchSet,
name string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.ProxyConfigEntry, error) {
idx, entry, err := s.configEntryWithOverridesTxn(tx, ws, structs.ProxyDefaults, name, overrides, entMeta)
if err != nil {
return 0, nil, err
} else if entry == nil {
return idx, nil, nil
}
proxy, ok := entry.(*structs.ProxyConfigEntry)
if !ok {
return 0, nil, fmt.Errorf("invalid service config type %T", entry)
}
return idx, proxy, nil
}
// getServiceConfigEntryTxn is a convenience method for fetching a
// service-defaults kind of config entry.
//
// If an override is returned the index returned will be 0.
func (s *Store) getServiceConfigEntryTxn(
tx *txn,
ws memdb.WatchSet,
serviceName string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.ServiceConfigEntry, error) {
idx, entry, err := s.configEntryWithOverridesTxn(tx, ws, structs.ServiceDefaults, serviceName, overrides, entMeta)
if err != nil {
return 0, nil, err
} else if entry == nil {
return idx, nil, nil
}
service, ok := entry.(*structs.ServiceConfigEntry)
if !ok {
return 0, nil, fmt.Errorf("invalid service config type %T", entry)
}
return idx, service, nil
}
// getRouterConfigEntryTxn is a convenience method for fetching a
// service-router kind of config entry.
//
// If an override is returned the index returned will be 0.
func (s *Store) getRouterConfigEntryTxn(
tx *txn,
ws memdb.WatchSet,
serviceName string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.ServiceRouterConfigEntry, error) {
idx, entry, err := s.configEntryWithOverridesTxn(tx, ws, structs.ServiceRouter, serviceName, overrides, entMeta)
if err != nil {
return 0, nil, err
} else if entry == nil {
return idx, nil, nil
}
router, ok := entry.(*structs.ServiceRouterConfigEntry)
if !ok {
return 0, nil, fmt.Errorf("invalid service config type %T", entry)
}
return idx, router, nil
}
// getSplitterConfigEntryTxn is a convenience method for fetching a
// service-splitter kind of config entry.
//
// If an override is returned the index returned will be 0.
func (s *Store) getSplitterConfigEntryTxn(
tx *txn,
ws memdb.WatchSet,
serviceName string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.ServiceSplitterConfigEntry, error) {
idx, entry, err := s.configEntryWithOverridesTxn(tx, ws, structs.ServiceSplitter, serviceName, overrides, entMeta)
if err != nil {
return 0, nil, err
} else if entry == nil {
return idx, nil, nil
}
splitter, ok := entry.(*structs.ServiceSplitterConfigEntry)
if !ok {
return 0, nil, fmt.Errorf("invalid service config type %T", entry)
}
return idx, splitter, nil
}
// getResolverConfigEntryTxn is a convenience method for fetching a
// service-resolver kind of config entry.
//
// If an override is returned the index returned will be 0.
func (s *Store) getResolverConfigEntryTxn(
tx *txn,
ws memdb.WatchSet,
serviceName string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, *structs.ServiceResolverConfigEntry, error) {
idx, entry, err := s.configEntryWithOverridesTxn(tx, ws, structs.ServiceResolver, serviceName, overrides, entMeta)
if err != nil {
return 0, nil, err
} else if entry == nil {
return idx, nil, nil
}
resolver, ok := entry.(*structs.ServiceResolverConfigEntry)
if !ok {
return 0, nil, fmt.Errorf("invalid service config type %T", entry)
}
return idx, resolver, nil
}
func (s *Store) configEntryWithOverridesTxn(
tx *txn,
ws memdb.WatchSet,
kind string,
name string,
overrides map[structs.ConfigEntryKindName]structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) (uint64, structs.ConfigEntry, error) {
if len(overrides) > 0 {
entry, ok := overrides[structs.ConfigEntryKindName{
Kind: kind, Name: name,
}]
if ok {
return 0, entry, nil // a nil entry implies it should act like it is erased
}
}
return s.configEntryTxn(tx, ws, kind, name, entMeta)
}
func (s *Store) validateProposedIngressProtocolsInServiceGraph(
tx *txn,
next structs.ConfigEntry,
entMeta *structs.EnterpriseMeta,
) error {
// This is the case for deleting a config entry
if next == nil {
return nil
}
ingress, ok := next.(*structs.IngressGatewayConfigEntry)
if !ok {
return fmt.Errorf("type %T is not an ingress gateway config entry", next)
}
validationFn := func(svc structs.ServiceName, expectedProto string) error {
_, svcProto, err := s.protocolForService(tx, nil, svc)
if err != nil {
return err
}
if svcProto != expectedProto {
return fmt.Errorf("service %q has protocol %q, which does not match defined listener protocol %q",
svc.String(), svcProto, expectedProto)
}
return nil
}
for _, l := range ingress.Listeners {
for _, s := range l.Services {
if s.Name == structs.WildcardSpecifier {
continue
}
err := validationFn(s.ToServiceName(), l.Protocol)
if err != nil {
return err
}
}
}
return nil
}
// protocolForService returns the service graph protocol associated to the
// provided service, checking all relevant config entries.
func (s *Store) protocolForService(
tx *txn,
ws memdb.WatchSet,
svc structs.ServiceName,
) (uint64, string, error) {
// Get the global proxy defaults (for default protocol)
maxIdx, proxyConfig, err := s.configEntryTxn(tx, ws, structs.ProxyDefaults, structs.ProxyConfigGlobal, structs.DefaultEnterpriseMeta())
if err != nil {
return 0, "", err
}
idx, serviceDefaults, err := s.configEntryTxn(tx, ws, structs.ServiceDefaults, svc.Name, &svc.EnterpriseMeta)
if err != nil {
return 0, "", err
}
maxIdx = lib.MaxUint64(maxIdx, idx)
entries := structs.NewDiscoveryChainConfigEntries()
if proxyConfig != nil {
entries.AddEntries(proxyConfig)
}
if serviceDefaults != nil {
entries.AddEntries(serviceDefaults)
}
req := discoverychain.CompileRequest{
ServiceName: svc.Name,
EvaluateInNamespace: svc.NamespaceOrDefault(),
EvaluateInDatacenter: "dc1",
// Use a dummy trust domain since that won't affect the protocol here.
EvaluateInTrustDomain: "b6fc9da3-03d4-4b5a-9134-c045e9b20152.consul",
UseInDatacenter: "dc1",
Entries: entries,
}
chain, err := discoverychain.Compile(req)
if err != nil {
return 0, "", err
}
return maxIdx, chain.Protocol, nil
}