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R.B. Boyer 6adad71125 wan federation via mesh gateways (#6884) ... This is like a Möbius strip of code due to the fact that low-level components (serf/memberlist) are connected to high-level components (the catalog and mesh-gateways) in a twisty maze of references which make it hard to dive into. With that in mind here's a high level summary of what you'll find in the patch: There are several distinct chunks of code that are affected: * new flags and config options for the server * retry join WAN is slightly different * retry join code is shared to discover primary mesh gateways from secondary datacenters * because retry join logic runs in the *agent* and the results of that operation for primary mesh gateways are needed in the *server* there are some methods like `RefreshPrimaryGatewayFallbackAddresses` that must occur at multiple layers of abstraction just to pass the data down to the right layer. * new cache type `FederationStateListMeshGatewaysName` for use in `proxycfg/xds` layers * the function signature for RPC dialing picked up a new required field (the node name of the destination) * several new RPCs for manipulating a FederationState object: `FederationState:{Apply,Get,List,ListMeshGateways}` * 3 read-only internal APIs for debugging use to invoke those RPCs from curl * raft and fsm changes to persist these FederationStates * replication for FederationStates as they are canonically stored in the Primary and replicated to the Secondaries. * a special derivative of anti-entropy that runs in secondaries to snapshot their local mesh gateway `CheckServiceNodes` and sync them into their upstream FederationState in the primary (this works in conjunction with the replication to distribute addresses for all mesh gateways in all DCs to all other DCs) * a "gateway locator" convenience object to make use of this data to choose the addresses of gateways to use for any given RPC or gossip operation to a remote DC. This gets data from the "retry join" logic in the agent and also directly calls into the FSM. * RPC (`:8300`) on the server sniffs the first byte of a new connection to determine if it's actually doing native TLS. If so it checks the ALPN header for protocol determination (just like how the existing system uses the type-byte marker). * 2 new kinds of protocols are exclusively decoded via this native TLS mechanism: one for ferrying "packet" operations (udp-like) from the gossip layer and one for "stream" operations (tcp-like). The packet operations re-use sockets (using length-prefixing) to cut down on TLS re-negotiation overhead. * the server instances specially wrap the `memberlist.NetTransport` when running with gateway federation enabled (in a `wanfed.Transport`). The general gist is that if it tries to dial a node in the SAME datacenter (deduced by looking at the suffix of the node name) there is no change. If dialing a DIFFERENT datacenter it is wrapped up in a TLS+ALPN blob and sent through some mesh gateways to eventually end up in a server's :8300 port. * a new flag when launching a mesh gateway via `consul connect envoy` to indicate that the servers are to be exposed. This sets a special service meta when registering the gateway into the catalog. * `proxycfg/xds` notice this metadata blob to activate additional watches for the FederationState objects as well as the location of all of the consul servers in that datacenter. * `xds:` if the extra metadata is in place additional clusters are defined in a DC to bulk sink all traffic to another DC's gateways. For the current datacenter we listen on a wildcard name (`server.<dc>.consul`) that load balances all servers as well as one mini-cluster per node (`<node>.server.<dc>.consul`) * the `consul tls cert create` command got a new flag (`-node`) to help create an additional SAN in certs that can be used with this flavor of federation.		5 years ago
..
catalog_datacenters.go	fix spelling errors (#7135)	5 years ago
catalog_datacenters_test.go	New Cache Types (#5995)	5 years ago
catalog_list_services.go	cache: remove data race in agent cache	5 years ago
catalog_list_services_test.go	New Cache Types (#5995)	5 years ago
catalog_service_list.go	Updates to Config Entries and Connect for Namespaces (#7116)	5 years ago
catalog_service_list_test.go	Updates to Config Entries and Connect for Namespaces (#7116)	5 years ago
catalog_services.go	cache: remove data race in agent cache	5 years ago
catalog_services_test.go	bugfix: use ServiceTags to generate cache key hash (#4987)	6 years ago
config_entry.go	cache: remove data race in agent cache	5 years ago
config_entry_test.go	Implement caching for config entry lists	5 years ago
connect_ca_leaf.go	Make the config entry and leaf cert cache types ns aware (#7256)	5 years ago
connect_ca_leaf_oss.go	Updates to Config Entries and Connect for Namespaces (#7116)	5 years ago
connect_ca_leaf_test.go	Make the config entry and leaf cert cache types ns aware (#7256)	5 years ago
connect_ca_root.go	cache: remove data race in agent cache	5 years ago
connect_ca_root_test.go	agent/cache-types: rename to separate root and leaf cache types	7 years ago
discovery_chain.go	cache: remove data race in agent cache	5 years ago
discovery_chain_test.go	connect: generate the full SNI names for discovery targets in the compiler rather than in the xds package (#6340)	5 years ago
federation_state_list_gateways.go	wan federation via mesh gateways (#6884)	5 years ago
federation_state_list_gateways_test.go	wan federation via mesh gateways (#6884)	5 years ago
health_services.go	fix spelling errors (#7135)	5 years ago
health_services_test.go	bugfix: use ServiceTags to generate cache key hash (#4987)	6 years ago
intention_match.go	cache: remove data race in agent cache	5 years ago
intention_match_test.go	agent/cache: address PR feedback, lots of typos	7 years ago
mock_RPC.go	agent/cache: Reorganize some files, RequestInfo struct, prepare for partitioning	7 years ago
node_services.go	fix spelling errors (#7135)	5 years ago
node_services_test.go	Allow DNS interface to use agent cache (#5300)	6 years ago
prepared_query.go	fix spelling errors (#7135)	5 years ago
prepared_query_test.go	Support Agent Caching for Service Discovery Results (#4541)	6 years ago
resolved_service_config.go	cache: remove data race in agent cache	5 years ago
resolved_service_config_test.go	Add integration test for central config; fix central config WIP (#5752)	6 years ago
rpc.go	agent/cache: Reorganize some files, RequestInfo struct, prepare for partitioning	7 years ago
service_checks.go	Updates to Config Entries and Connect for Namespaces (#7116)	5 years ago
service_checks_test.go	Sync of OSS changes to support namespaces (#6909)	5 years ago
service_dump.go	cache: remove data race in agent cache	5 years ago
service_dump_test.go	Implement Kind based ServiceDump and caching of the ServiceDump RPC	5 years ago
testing.go	agent/cache-types: got basic CA leaf caching work, major problems still	7 years ago