mirror of
https://github.com/gravitational/teleport.git
synced 2026-10-31 20:39:37 +08:00
rosstimothy
e4e7f538ce
* create package to contain proxy peering code * Refactor proxy routing logic into a reusable object Routing logic existed within an unexported handler of ssh subsystem requests, which prevented it from being reused by other components within the proxy, like the webapi server. This causes significant latency issues for web sessions because the web apiserver is required to dial the proxy ssh server to determine how to route to the host. Since the web apiserver and the proxy ssh server exist in the same process this is an entirely unnecesarry step that could be avoided if the routing and ability to established connections were shared throughout the proxy. A new `proxy.Router` object is introduced which contains all the logic that used to exist in `regular.proxySubsys` for determining how to connect to servers and clusters. All routing within the `regular.proxySubsys` now leverages the `proxy.Router` to dial the target. This is step 1 in addressing #15167. Now that the `proxy.Router` exists `web.APIServer` will be able to make use of it to avoid dialing the same process to establish connections.
130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
// Copyright 2022 Gravitational, Inc
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package peer
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import (
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"context"
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"io"
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"strings"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/stats"
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"google.golang.org/grpc/status"
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)
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type ctxKey struct{}
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type (
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serviceKey ctxKey
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methodKey ctxKey
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remoteAddrKey ctxKey
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localAddrKey ctxKey
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)
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// StatsHandler is for gRPC stats
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type statsHandler struct {
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reporter *reporter
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}
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func newStatsHandler(r *reporter) stats.Handler {
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return &statsHandler{
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reporter: r,
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}
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}
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// TagConn implements per-Connection context tagging.
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func (s *statsHandler) TagConn(ctx context.Context, info *stats.ConnTagInfo) context.Context {
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ctx = context.WithValue(ctx, remoteAddrKey{}, info.RemoteAddr.String())
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ctx = context.WithValue(ctx, localAddrKey{}, info.LocalAddr.String())
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return ctx
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}
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// HandleConn implements per-Connection stats reporting.
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func (s *statsHandler) HandleConn(ctx context.Context, connStats stats.ConnStats) {
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// client connection stats are monitored by the monitor() function in client.go
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if connStats.IsClient() {
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return
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}
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remoteAddr, _ := ctx.Value(remoteAddrKey{}).(string)
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localAddr, _ := ctx.Value(localAddrKey{}).(string)
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switch connStats.(type) {
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case *stats.ConnBegin:
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s.reporter.incConnection(localAddr, remoteAddr, "SERVER_CONN")
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case *stats.ConnEnd:
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s.reporter.decConnection(localAddr, remoteAddr, "SERVER_CONN")
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}
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}
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// TagRPC implements per-RPC context tagging.
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func (s *statsHandler) TagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
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service, method := split(info.FullMethodName)
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ctx = context.WithValue(ctx, serviceKey{}, service)
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ctx = context.WithValue(ctx, methodKey{}, method)
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return ctx
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}
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// HandleRPC implements per-RPC stats reporting.
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func (s *statsHandler) HandleRPC(ctx context.Context, rpcStats stats.RPCStats) {
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service, _ := ctx.Value(serviceKey{}).(string)
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method, _ := ctx.Value(methodKey{}).(string)
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switch rs := rpcStats.(type) {
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case *stats.InPayload:
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s.reporter.measureMessageReceived(service, method, float64(rs.WireLength))
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case *stats.OutPayload:
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s.reporter.measureMessageSent(service, method, float64(rs.WireLength))
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case *stats.Begin:
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s.reporter.incRPC(service, method)
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case *stats.End:
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code := codes.OK.String()
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if isError(rs.Error) {
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code = status.Code(rs.Error).String()
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}
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s.reporter.decRPC(service, method)
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s.reporter.countRPC(service, method, code)
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s.reporter.timeRPC(service, method, code, rs.EndTime.Sub(rs.BeginTime))
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}
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}
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// split splits a grpc request path into service and method strings
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// request format /%s/%s
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func split(request string) (string, string) {
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if i := strings.LastIndex(request, "/"); i >= 0 {
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return request[1:i], request[i+1:]
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}
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return "unknown", "unknown"
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}
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// isError returns false if the supplied error
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// - is nil
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// - has a codes.OK code
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// - is io.EOF
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func isError(err error) bool {
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if err == nil {
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return false
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}
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grpcErr := status.Convert(err)
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code := grpcErr.Code()
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if code == codes.OK {
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return false
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}
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eof := status.Convert(io.EOF)
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return code != eof.Code() || grpcErr.Message() != eof.Message()
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}
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