mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-02 23:31:08 +08:00
David Boslee
32695a2f05
This adds proxy peering support. A configurable setting that allows for agents to connect to a subset of proxies and be reachable through any proxy in the cluster. This is achieved by creating grpc connections between each proxy server. Client connections can then be passed between proxies to the desired agent.
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 proxy
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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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// HandleRPC 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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