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51aa59a737
This PR adds a WebSocket grid feature that allows servers to communicate via
a single two-way connection.
There are two request types:
* Single requests, which are `[]byte => ([]byte, error)`. This is for efficient small
roundtrips with small payloads.
* Streaming requests which are `[]byte, chan []byte => chan []byte (and error)`,
which allows for different combinations of full two-way streams with an initial payload.
Only a single stream is created between two machines - and there is, as such, no
server/client relation since both sides can initiate and handle requests. Which server
initiates the request is decided deterministically on the server names.
Requests are made through a mux client and server, which handles message
passing, congestion, cancelation, timeouts, etc.
If a connection is lost, all requests are canceled, and the calling server will try
to reconnect. Registered handlers can operate directly on byte
slices or use a higher-level generics abstraction.
There is no versioning of handlers/clients, and incompatible changes should
be handled by adding new handlers.
The request path can be changed to a new one for any protocol changes.
First, all servers create a "Manager." The manager must know its address
as well as all remote addresses. This will manage all connections.
To get a connection to any remote, ask the manager to provide it given
the remote address using.
```
func (m *Manager) Connection(host string) *Connection
```
All serverside handlers must also be registered on the manager. This will
make sure that all incoming requests are served. The number of in-flight
requests and responses must also be given for streaming requests.
The "Connection" returned manages the mux-clients. Requests issued
to the connection will be sent to the remote.
* `func (c *Connection) Request(ctx context.Context, h HandlerID, req []byte) ([]byte, error)`
performs a single request and returns the result. Any deadline provided on the request is
forwarded to the server, and canceling the context will make the function return at once.
* `func (c *Connection) NewStream(ctx context.Context, h HandlerID, payload []byte) (st *Stream, err error)`
will initiate a remote call and send the initial payload.
```Go
// A Stream is a two-way stream.
// All responses *must* be read by the caller.
// If the call is canceled through the context,
//The appropriate error will be returned.
type Stream struct {
// Responses from the remote server.
// Channel will be closed after an error or when the remote closes.
// All responses *must* be read by the caller until either an error is returned or the channel is closed.
// Canceling the context will cause the context cancellation error to be returned.
Responses <-chan Response
// Requests sent to the server.
// If the handler is defined with 0 incoming capacity this will be nil.
// Channel *must* be closed to signal the end of the stream.
// If the request context is canceled, the stream will no longer process requests.
Requests chan<- []byte
}
type Response struct {
Msg []byte
Err error
}
```
There are generic versions of the server/client handlers that allow the use of type
safe implementations for data types that support msgpack marshal/unmarshal.
111 lines
3.7 KiB
Go
111 lines
3.7 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"net/http"
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"github.com/minio/minio/internal/grid"
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"github.com/minio/mux"
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)
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// Composed function registering routers for only distributed Erasure setup.
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func registerDistErasureRouters(router *mux.Router, endpointServerPools EndpointServerPools) {
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// Register storage REST router only if its a distributed setup.
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registerStorageRESTHandlers(router, endpointServerPools, globalGrid.Load())
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// Register peer REST router only if its a distributed setup.
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registerPeerRESTHandlers(router)
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// Register peer S3 router only if its a distributed setup.
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registerPeerS3Handlers(router)
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// Register bootstrap REST router for distributed setups.
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registerBootstrapRESTHandlers(router)
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// Register distributed namespace lock routers.
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registerLockRESTHandlers()
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// Add grid to router
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router.Handle(grid.RoutePath, adminMiddleware(globalGrid.Load().Handler(), noGZFlag, noObjLayerFlag))
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}
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// List of some generic middlewares which are applied for all incoming requests.
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var globalMiddlewares = []mux.MiddlewareFunc{
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// set x-amz-request-id header and others
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addCustomHeadersMiddleware,
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// The generic tracer needs to be the first middleware to catch all requests
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// returned early by any other middleware (but after the middleware that
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// sets the amz request id).
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httpTracerMiddleware,
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// Auth middleware verifies incoming authorization headers and routes them
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// accordingly. Client receives a HTTP error for invalid/unsupported
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// signatures.
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//
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// Validates all incoming requests to have a valid date header.
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setAuthMiddleware,
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// Redirect some pre-defined browser request paths to a static location
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// prefix.
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setBrowserRedirectMiddleware,
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// Adds 'crossdomain.xml' policy middleware to serve legacy flash clients.
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setCrossDomainPolicyMiddleware,
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// Limits all body and header sizes to a maximum fixed limit
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setRequestLimitMiddleware,
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// Validate all the incoming requests.
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setRequestValidityMiddleware,
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// Add upload forwarding middleware for site replication
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setUploadForwardingMiddleware,
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// Add bucket forwarding middleware
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setBucketForwardingMiddleware,
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// Add new middlewares here.
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}
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// configureServer handler returns final handler for the http server.
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func configureServerHandler(endpointServerPools EndpointServerPools) (http.Handler, error) {
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// Initialize router. `SkipClean(true)` stops minio/mux from
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// normalizing URL path minio/minio#3256
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router := mux.NewRouter().SkipClean(true).UseEncodedPath()
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// Initialize distributed NS lock.
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if globalIsDistErasure {
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registerDistErasureRouters(router, endpointServerPools)
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}
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// Add Admin router, all APIs are enabled in server mode.
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registerAdminRouter(router, true)
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// Add healthCheck router
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registerHealthCheckRouter(router)
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// Add server metrics router
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registerMetricsRouter(router)
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// Add STS router always.
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registerSTSRouter(router)
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// Add KMS router
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registerKMSRouter(router)
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// Add API router
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registerAPIRouter(router)
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router.Use(globalMiddlewares...)
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return router, nil
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}
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