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* Adding explicit MPL license for sub-package This directory and its subdirectories (packages) contain files licensed with the MPLv2 `LICENSE` file in this directory and are intentionally licensed separately from the BSL `LICENSE` file at the root of this repository. * Adding explicit MPL license for sub-package This directory and its subdirectories (packages) contain files licensed with the MPLv2 `LICENSE` file in this directory and are intentionally licensed separately from the BSL `LICENSE` file at the root of this repository. * Updating the license from MPL to Business Source License Going forward, this project will be licensed under the Business Source License v1.1. Please see our blog post for more details at <Blog URL>, FAQ at www.hashicorp.com/licensing-faq, and details of the license at www.hashicorp.com/bsl. * add missing license headers * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 * Update copyright file headers to BUSL-1.1 --------- Co-authored-by: hashicorp-copywrite[bot] <110428419+hashicorp-copywrite[bot]@users.noreply.github.com>
124 lines
3.2 KiB
Go
124 lines
3.2 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package subscribe
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import (
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"errors"
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"github.com/hashicorp/go-hclog"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/agent/consul/state"
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"github.com/hashicorp/consul/agent/consul/stream"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/proto/private/pbsubscribe"
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)
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// Server implements a StateChangeSubscriptionServer for accepting SubscribeRequests,
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// and sending events to the subscription topic.
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type Server struct {
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Backend Backend
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Logger Logger
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}
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func NewServer(backend Backend, logger Logger) *Server {
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return &Server{Backend: backend, Logger: logger}
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}
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type Logger interface {
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Trace(msg string, args ...interface{})
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With(args ...interface{}) hclog.Logger
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}
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var _ pbsubscribe.StateChangeSubscriptionServer = (*Server)(nil)
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type Backend interface {
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ResolveTokenAndDefaultMeta(token string, entMeta *acl.EnterpriseMeta, authzContext *acl.AuthorizerContext) (acl.Authorizer, error)
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Forward(info structs.RPCInfo, f func(*grpc.ClientConn) error) (handled bool, err error)
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Subscribe(req *stream.SubscribeRequest) (*stream.Subscription, error)
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}
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func (h *Server) Subscribe(req *pbsubscribe.SubscribeRequest, serverStream pbsubscribe.StateChangeSubscription_SubscribeServer) error {
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logger := newLoggerForRequest(h.Logger, req)
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handled, err := h.Backend.Forward(req, forwardToDC(req, serverStream, logger))
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if handled || err != nil {
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return err
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}
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logger.Trace("new subscription")
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defer logger.Trace("subscription closed")
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entMeta := req.EnterpriseMeta()
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authz, err := h.Backend.ResolveTokenAndDefaultMeta(req.Token, &entMeta, nil)
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if err != nil {
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return err
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}
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subReq, err := state.PBToStreamSubscribeRequest(req, entMeta)
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if err != nil {
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return status.Error(codes.InvalidArgument, err.Error())
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}
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sub, err := h.Backend.Subscribe(subReq)
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if err != nil {
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return err
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}
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defer sub.Unsubscribe()
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ctx := serverStream.Context()
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elog := &eventLogger{logger: logger}
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for {
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event, err := sub.Next(ctx)
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switch {
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case errors.Is(err, stream.ErrSubForceClosed):
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logger.Trace("subscription reset by server")
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return status.Error(codes.Aborted, err.Error())
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case err != nil:
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return err
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}
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if !event.Payload.HasReadPermission(authz) {
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continue
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}
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elog.Trace(event)
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// TODO: This conversion could be cached if needed
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e := event.Payload.ToSubscriptionEvent(event.Index)
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if err := serverStream.Send(e); err != nil {
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return err
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}
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}
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}
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func forwardToDC(
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req *pbsubscribe.SubscribeRequest,
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serverStream pbsubscribe.StateChangeSubscription_SubscribeServer,
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logger Logger,
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) func(conn *grpc.ClientConn) error {
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return func(conn *grpc.ClientConn) error {
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logger.Trace("forwarding to another DC")
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defer logger.Trace("forwarded stream closed")
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client := pbsubscribe.NewStateChangeSubscriptionClient(conn)
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streamHandle, err := client.Subscribe(serverStream.Context(), req)
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if err != nil {
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return err
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}
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for {
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event, err := streamHandle.Recv()
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if err != nil {
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return err
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}
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if err := serverStream.Send(event); err != nil {
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return err
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}
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}
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}
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}
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