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TUN-8861: Add session limiter to TCP session manager

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## Summary
In order to make cloudflared behavior more predictable and
prevent an exhaustion of resources, we have decided to add
session limits that can be configured by the user. This commit
adds the session limiter to the HTTP/TCP handling path.
For now the limiter is set to run only in unlimited mode.
This commit is contained in:
João "Pisco" Fernandes
2025-01-14 14:05:18 +00:00
parent bf4954e96a
commit 8bfe111cab
12 changed files with 275 additions and 102 deletions
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5
tunnelrpc/pogs/quic_metadata_protocol.go
View File

@@ -18,6 +18,11 @@ const (
ConnectionTypeTCP
)
var (
// ErrorFlowConnectRateLimitedKey is the Metadata entry that allows to know if a request was rate limited on connect.
ErrorFlowConnectRateLimitedKey = Metadata{Key: "FlowConnectRateLimited", Val: "true"}
)
func (c ConnectionType) String() string {
switch c {
case ConnectionTypeHTTP:

3
tunnelrpc/quic/request_server_stream.go
View File

@@ -37,7 +37,8 @@ func (rss *RequestServerStream) WriteConnectResponseData(respErr error, metadata
var connectResponse *pogs.ConnectResponse
if respErr != nil {
connectResponse = &pogs.ConnectResponse{
Error: respErr.Error(),
Error: respErr.Error(),
Metadata: metadata,
}
} else {
connectResponse = &pogs.ConnectResponse{

29
tunnelrpc/quic/request_server_stream_test.go
View File

@@ -98,12 +98,7 @@ func TestConnectResponseMeta(t *testing.T) {
reqClientStream := RequestClientStream{noopCloser{b}}
respMeta, err := reqClientStream.ReadConnectResponseData()
require.NoError(t, err)
if respMeta.Error == "" {
assert.Equal(t, test.metadata, respMeta.Metadata)
} else {
assert.Equal(t, 0, len(respMeta.Metadata))
}
require.Equal(t, test.metadata, respMeta.Metadata)
})
}
}
@@ -153,21 +148,21 @@ func TestRegisterUdpSession(t *testing.T) {
}()
rpcClientStream, err := NewCloudflaredClient(context.Background(), clientStream, 5*time.Second)
assert.NoError(t, err)
require.NoError(t, err)
reg, err := rpcClientStream.RegisterUdpSession(context.Background(), test.sessionRPCServer.sessionID, test.sessionRPCServer.dstIP, test.sessionRPCServer.dstPort, testCloseIdleAfterHint, test.sessionRPCServer.traceContext)
assert.NoError(t, err)
assert.NoError(t, reg.Err)
require.NoError(t, err)
require.NoError(t, reg.Err)
// Different sessionID, the RPC server should reject the registraion
// Different sessionID, the RPC server should reject the registration
reg, err = rpcClientStream.RegisterUdpSession(context.Background(), uuid.New(), test.sessionRPCServer.dstIP, test.sessionRPCServer.dstPort, testCloseIdleAfterHint, test.sessionRPCServer.traceContext)
assert.NoError(t, err)
assert.Error(t, reg.Err)
require.NoError(t, err)
require.Error(t, reg.Err)
assert.NoError(t, rpcClientStream.UnregisterUdpSession(context.Background(), test.sessionRPCServer.sessionID, unregisterMessage))
require.NoError(t, rpcClientStream.UnregisterUdpSession(context.Background(), test.sessionRPCServer.sessionID, unregisterMessage))
// Different sessionID, the RPC server should reject the unregistraion
assert.Error(t, rpcClientStream.UnregisterUdpSession(context.Background(), uuid.New(), unregisterMessage))
// Different sessionID, the RPC server should reject the unregistration
require.Error(t, rpcClientStream.UnregisterUdpSession(context.Background(), uuid.New(), unregisterMessage))
rpcClientStream.Close()
<-sessionRegisteredChan
@@ -200,10 +195,10 @@ func TestManageConfiguration(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
rpcClientStream, err := NewCloudflaredClient(ctx, clientStream, 5*time.Second)
assert.NoError(t, err)
require.NoError(t, err)
result, err := rpcClientStream.UpdateConfiguration(ctx, version, config)
assert.NoError(t, err)
require.NoError(t, err)
require.Equal(t, version, result.LastAppliedVersion)
require.NoError(t, result.Err)