The grpc resolver implementation is fed from changes to the
router.Router. Within the router there is a map of various areas storing
the addressing information for servers in those areas. All map entries
are of the WAN variety except a single special entry for the LAN.
Addressing information in the LAN "area" are local addresses intended
for use when making a client-to-server or server-to-server request.
The client agent correctly updates this LAN area when receiving lan serf
events, so by extension the grpc resolver works fine in that scenario.
The server agent only initially populates a single entry in the LAN area
(for itself) on startup, and then never mutates that area map again.
For normal RPCs a different structure is used for LAN routing.
Additionally when selecting a server to contact in the local datacenter
it will randomly select addresses from either the LAN or WAN addressed
entries in the map.
Unfortunately this means that the grpc resolver stack as it exists on
server agents is either broken or only accidentally functions by having
servers dial each other over the WAN-accessible address. If the operator
disables the serf wan port completely likely this incidental functioning
would break.
This PR enforces that local requests for servers (both for stale reads
or leader forwarded requests) exclusively use the LAN "area" information
and also fixes it so that servers keep that area up to date in the
router.
A test for the grpc resolver logic was added, as well as a higher level
full-stack test to ensure the externally perceived bug does not return.
Registering gRPC balancers is thread-unsafe because they are stored in a
global map variable that is accessed without holding a lock. Therefore,
it's expected that balancers are registered _once_ at the beginning of
your program (e.g. in a package `init` function) and certainly not after
you've started dialing connections, etc.
> NOTE: this function must only be called during initialization time
> (i.e. in an init() function), and is not thread-safe.
While this is fine for us in production, it's challenging for tests that
spin up multiple agents in-memory. We currently register a balancer per-
agent which holds agent-specific state that cannot safely be shared.
This commit introduces our own registry that _is_ thread-safe, and
implements the Builder interface such that we can call gRPC's `Register`
method once, on start-up. It uses the same pattern as our resolver
registry where we use the dial target's host (aka "authority"), which is
unique per-agent, to determine which builder to use.
Protobuf Refactoring for Multi-Module Cleanliness
This commit includes the following:
Moves all packages that were within proto/ to proto/private
Rewrites imports to account for the packages being moved
Adds in buf.work.yaml to enable buf workspaces
Names the proto-public buf module so that we can override the Go package imports within proto/buf.yaml
Bumps the buf version dependency to 1.14.0 (I was trying out the version to see if it would get around an issue - it didn't but it also doesn't break things and it seemed best to keep up with the toolchain changes)
Why:
In the future we will need to consume other protobuf dependencies such as the Google HTTP annotations for openapi generation or grpc-gateway usage.
There were some recent changes to have our own ratelimiting annotations.
The two combined were not working when I was trying to use them together (attempting to rebase another branch)
Buf workspaces should be the solution to the problem
Buf workspaces means that each module will have generated Go code that embeds proto file names relative to the proto dir and not the top level repo root.
This resulted in proto file name conflicts in the Go global protobuf type registry.
The solution to that was to add in a private/ directory into the path within the proto/ directory.
That then required rewriting all the imports.
Is this safe?
AFAICT yes
The gRPC wire protocol doesn't seem to care about the proto file names (although the Go grpc code does tack on the proto file name as Metadata in the ServiceDesc)
Other than imports, there were no changes to any generated code as a result of this.
Enforce lowercase peer names.
Prior to this change peer names could be mixed case.
This can cause issues, as peer names are used as DNS labels
in various locations. It also caused issues with envoy
configuration.
This is the OSS portion of enterprise PR 3822.
Adds a custom gRPC balancer that replicates the router's server cycling
behavior. Also enables automatic retries for RESOURCE_EXHAUSTED errors,
which we now get for free.
* Rate limiting handler - ensure configuration has changed before modifying limiters
* Updating test to validate arguments to UpdateConfig
* Removing duplicate test. Updating mock.
* Renaming NullRateLimiter to NullRequestLimitsHandler
* Rate Limit Handler - ensure rate limiting is not in the code path when not configured
* Update agent/consul/rate/handler.go
Co-authored-by: Dhia Ayachi <dhia@hashicorp.com>
* formatting handler.go
* Rate limiting handler - ensure configuration has changed before modifying limiters
* Updating test to validate arguments to UpdateConfig
* Removing duplicate test. Updating mock.
* adding logging for when UpdateConfig is called but the config has not changed.
* Update agent/consul/rate/handler.go
Co-authored-by: Dhia Ayachi <dhia@hashicorp.com>
* Update agent/consul/rate/handler_test.go
Co-authored-by: Dan Upton <daniel@floppy.co>
* modifying existing variable name based on pr feedback
* updating a broken merge conflict;
Co-authored-by: Dhia Ayachi <dhia@hashicorp.com>
Co-authored-by: Dan Upton <daniel@floppy.co>
* server: add placeholder glue for rate limit handler
This commit adds a no-op implementation of the rate-limit handler and
adds it to the `consul.Server` struct and setup code.
This allows us to start working on the net/rpc and gRPC interceptors and
config logic.
* Add handler errors
* Set the global read and write limits
* fixing multilimiter moving packages
* Fix typo
* Simplify globalLimit usage
* add multilimiter and tests
* exporting LimitedEntity
* Apply suggestions from code review
Co-authored-by: John Murret <john.murret@hashicorp.com>
* add config update and rename config params
* add doc string and split config
* Apply suggestions from code review
Co-authored-by: Dan Upton <daniel@floppy.co>
* use timer to avoid go routine leak and change the interface
* add comments to tests
* fix failing test
* add prefix with config edge, refactor tests
* Apply suggestions from code review
Co-authored-by: Dan Upton <daniel@floppy.co>
* refactor to apply configs for limiters under a prefix
* add fuzz tests and fix bugs found. Refactor reconcile loop to have a simpler logic
* make KeyType an exported type
* split the config and limiter trees to fix race conditions in config update
* rename variables
* fix race in test and remove dead code
* fix reconcile loop to not create a timer on each loop
* add extra benchmark tests and fix tests
* fix benchmark test to pass value to func
* server: add placeholder glue for rate limit handler
This commit adds a no-op implementation of the rate-limit handler and
adds it to the `consul.Server` struct and setup code.
This allows us to start working on the net/rpc and gRPC interceptors and
config logic.
* Set the global read and write limits
* fixing multilimiter moving packages
* add server configuration for global rate limiting.
* remove agent test
* remove added stuff from handler
* remove added stuff from multilimiter
* removing unnecessary TODOs
* Removing TODO comment from handler
* adding in defaulting to infinite
* add disabled status in there
* adding in documentation for disabled mode.
* make disabled the default.
* Add mock and agent test
* addig documentation and missing mock file.
* Fixing test TestLoad_IntegrationWithFlags
* updating docs based on PR feedback.
* Updating Request Limits mode to use int based on PR feedback.
* Adding RequestLimits struct so we have a nested struct in ReloadableConfig.
* fixing linting references
* Update agent/consul/rate/handler.go
Co-authored-by: Dan Upton <daniel@floppy.co>
* Update agent/consul/config.go
Co-authored-by: Dan Upton <daniel@floppy.co>
* removing the ignore of the request limits in JSON. addingbuilder logic to convert any read rate or write rate less than 0 to rate.Inf
* added conversion function to convert request limits object to handler config.
* Updating docs to reflect gRPC and RPC are rate limit and as a result, HTTP requests are as well.
* Updating values for TestLoad_FullConfig() so that they were different and discernable.
* Updating TestRuntimeConfig_Sanitize
* Fixing TestLoad_IntegrationWithFlags test
* putting nil check in place
* fixing rebase
* removing change for missing error checks. will put in another PR
* Rebasing after default multilimiter config change
* resolving rebase issues
* updating reference for incomingRPCLimiter to use interface
* updating interface
* Updating interfaces
* Fixing mock reference
Co-authored-by: Daniel Upton <daniel@floppy.co>
Co-authored-by: Dhia Ayachi <dhia@hashicorp.com>
Implements the gRPC middleware for rate-limiting as a tap.ServerInHandle
function (executed before the request is unmarshaled).
Mappings between gRPC methods and their operation type are generated by
a protoc plugin introduced by #15564.
* update go version to 1.18 for api and sdk, go mod tidy
* removes ioutil usage everywhere which was deprecated in go1.16 in favour of io and os packages. Also introduces a lint rule which forbids use of ioutil going forward.
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
Re-add ServerExternalAddresses parameter in GenerateToken endpoint
This reverts commit 5e156772f6
and adds extra functionality to support newer peering behaviors.
* Regenerate golden files.
* Backport from ENT: "Avoid race"
Original commit: 5006c8c858b0e332be95271ef9ba35122453315b
Original author: freddygv
* Backport from ENT: "chore: fix flake peerstream test"
Original commit: b74097e7135eca48cc289798c5739f9ef72c0cc8
Original author: DanStough
This commit updates the establish endpoint to bubble up a 403 status
code to callers when the establishment secret from the token is invalid.
This is a signal that a new peering token must be generated.
When peering through mesh gateways we expect outbound dials to peer
servers to flow through the local mesh gateway addresses.
Now when establishing a peering we get a list of dial addresses as a
ring buffer that includes local mesh gateway addresses if the local DC
is configured to peer through mesh gateways. The ring buffer includes
the mesh gateway addresses first, but also includes the remote server
addresses as a fallback.
This fallback is present because it's possible that direct egress from
the servers may be allowed. If not allowed then the leader will cycle
back to a mesh gateway address through the ring.
When attempting to dial the remote servers we retry up to a fixed
timeout. If using mesh gateways we also have an initial wait in
order to allow for the mesh gateways to configure themselves.
Note that if we encounter a permission denied error we do not retry
since that error indicates that the secret in the peering token is
invalid.
* Move stats.go from grpc-internal to grpc-middleware
* Update grpc server metrics with server type label
* Add stats test to grpc-external
* Remove global metrics instance from grpc server tests
A previous commit introduced an internally-managed server certificate
to use for peering-related purposes.
Now the peering token has been updated to match that behavior:
- The server name matches the structure of the server cert
- The CA PEMs correspond to the Connect CA
Note that if Conect is disabled, and by extension the Connect CA, we
fall back to the previous behavior of returning the manually configured
certs and local server SNI.
Several tests were updated to use the gRPC TLS port since they enable
Connect by default. This means that the peering token will embed the
Connect CA, and the dialer will expect a TLS listener.
Prior to #13244, connect proxies and gateways could only be configured by an
xDS session served by the local client agent.
In an upcoming release, it will be possible to deploy a Consul service mesh
without client agents. In this model, xDS sessions will be handled by the
servers themselves, which necessitates load-balancing to prevent a single
server from receiving a disproportionate amount of load and becoming
overwhelmed.
This introduces a simple form of load-balancing where Consul will attempt to
achieve an even spread of load (xDS sessions) between all healthy servers.
It does so by implementing a concurrent session limiter (limiter.SessionLimiter)
and adjusting the limit according to autopilot state and proxy service
registrations in the catalog.
If a server is already over capacity (i.e. the session limit is lowered),
Consul will begin draining sessions to rebalance the load. This will result
in the client receiving a `RESOURCE_EXHAUSTED` status code. It is the client's
responsibility to observe this response and reconnect to a different server.
Users of the gRPC client connection brokered by the
consul-server-connection-manager library will get this for free.
The rate at which Consul will drain sessions to rebalance load is scaled
dynamically based on the number of proxies in the catalog.
Peerings are terminated when a peer decides to delete the peering from
their end. Deleting a peering sends a termination message to the peer
and triggers them to mark the peering as terminated but does NOT delete
the peering itself. This is to prevent peerings from disappearing from
both sides just because one side deleted them.
Previously the Delete endpoint was skipping the deletion if the peering
was not marked as active. However, terminated peerings are also
inactive.
This PR makes some updates so that peerings marked as terminated can be
deleted by users.
* defaulting to false because peering will be released as beta
* Ignore peering disabled error in bundles cachetype
Co-authored-by: Matt Keeler <mkeeler@users.noreply.github.com>
Co-authored-by: freddygv <freddy@hashicorp.com>
Co-authored-by: Matt Keeler <mjkeeler7@gmail.com>
Update generate token endpoint (rpc, http, and api module)
If ServerExternalAddresses are set, it will override any addresses gotten from the "consul" service, and be used in the token instead, and dialed by the dialer. This allows for setting up a load balancer for example, in front of the consul servers.
Ensure that the peer stream replication rpc can successfully be used with TLS activated.
Also:
- If key material is configured for the gRPC port but HTTPS is not
enabled now TLS will still be activated for the gRPC port.
- peerstream replication stream opened by the establishing-side will now
ignore grpc.WithBlock so that TLS errors will bubble up instead of
being awkwardly delayed or suppressed
Previously, public referred to gRPC services that are both exposed on
the dedicated gRPC port and have their definitions in the proto-public
directory (so were considered usable by 3rd parties). Whereas private
referred to services on the multiplexed server port that are only usable
by agents and other servers.
Now, we're splitting these definitions, such that external/internal
refers to the port and public/private refers to whether they can be used
by 3rd parties.
This is necessary because the peering replication API needs to be
exposed on the dedicated port, but is not (yet) suitable for use by 3rd
parties.
Peer replication is intended to be between separate Consul installs and
effectively should be considered "external". This PR moves the peer
stream replication bidirectional RPC endpoint to the external gRPC
server and ensures that things continue to function.
These changes are primarily for Consul's UI, where we want to be more
specific about the state a peering is in.
- The "initial" state was renamed to pending, and no longer applies to
peerings being established from a peering token.
- Upon request to establish a peering from a peering token, peerings
will be set as "establishing". This will help distinguish between the
two roles: the cluster that generates the peering token and the
cluster that establishes the peering.
- When marked for deletion, peering state will be set to "deleting".
This way the UI determines the deletion via the state rather than the
"DeletedAt" field.
Co-authored-by: freddygv <freddy@hashicorp.com>
This is the OSS portion of enterprise PR 2056.
This commit provides server-local implementations of the proxycfg.ConfigEntry
and proxycfg.ConfigEntryList interfaces, that source data from streaming events.
It makes use of the LocalMaterializer type introduced for peering replication,
adding the necessary support for authorization.
It also adds support for "wildcard" subscriptions (within a topic) to the event
publisher, as this is needed to fetch service-resolvers for all services when
configuring mesh gateways.
Currently, events will be emitted for just the ingress-gateway, service-resolver,
and mesh config entry types, as these are the only entries required by proxycfg
— the events will be emitted on topics named IngressGateway, ServiceResolver,
and MeshConfig topics respectively.
Though these events will only be consumed "locally" for now, they can also be
consumed via the gRPC endpoint (confirmed using grpcurl) so using them from
client agents should be a case of swapping the LocalMaterializer for an
RPCMaterializer.
When traversing an exported peered service, the discovery chain
evaluation at the other side may re-route the request to a variety of
endpoints. Furthermore we intend to terminate mTLS at the mesh gateway
for arriving peered traffic that is http-like (L7), so the caller needs
to know the mesh gateway's SpiffeID in that case as well.
The following new SpiffeID values will be shipped back in the peerstream
replication:
- tcp: all possible SpiffeIDs resulting from the service-resolver
component of the exported discovery chain
- http-like: the SpiffeID of the mesh gateway
Dan Stough