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This adds a new message type for passing file descriptors. How this works is: 1. Client sends a message with a header for messageTypeFileDescriptor along with the list of descriptors to be sent 2. Client sends 2nd message to actually pass along the descriptors (needed for unix sockets). 3. Server sees the message type and waits to receive the fd's. 4. Once fd's are seen the server responds with the real fd numbers that are used which an application can use in future calls. To accomplish this reliably (on unix sockets) I had to drop the usage of the bufio.Reader because we need to ensure exact message boundaries. Within ttrpc this only support unix sockets and `net.Conn` implementations that implement `SendFds`/`ReceiveFds` (this interface is totally invented here). Something to consider, I have not attempted to do fd passing on Windows which will need other mechanisms entirely (and the conn's provided by winio are not sufficient for fd passing). I'm not sure if this new messaging will actually work on a Windows implementation. Perhaps the message tpye should be specifically for unix sockets? I'm not sure how this would be enforced at the moment except by checking if the `net.Conn` is a `*net.UnixConn`. Signed-off-by: Brian Goff <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| /* | ||
| Copyright The containerd Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package ttrpc | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "os" | ||
| "strconv" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| func TestSendRecvFd(t *testing.T) { | ||
| var ( | ||
| ctx, cancel = context.WithDeadline(context.Background(), time.Now().Add(1*time.Minute)) | ||
| addr, listener = newTestListener(t) | ||
| ) | ||
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|
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| defer cancel() | ||
|
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| // Spin up an out of process ttrpc server | ||
| if err := listenerCmd(ctx, t.Name(), listener); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
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| var ( | ||
| client, cleanup = newTestClient(t, addr) | ||
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| tclient = testFdClient{client} | ||
| ) | ||
| defer cleanup() | ||
|
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| r, w, err := os.Pipe() | ||
| if err != nil { | ||
| t.Fatal(err, "error creating test pipe") | ||
| } | ||
| defer r.Close() | ||
|
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| type readResp struct { | ||
| buf []byte | ||
| err error | ||
| } | ||
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| expect := []byte("hello") | ||
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| chResp := make(chan readResp, 1) | ||
| go func() { | ||
| buf := make([]byte, len(expect)) | ||
| _, err := io.ReadFull(r, buf) | ||
| chResp <- readResp{buf, err} | ||
| }() | ||
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| if err := tclient.Test(ctx, w); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
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| select { | ||
| case <-ctx.Done(): | ||
| t.Fatal(ctx.Err()) | ||
| case resp := <-chResp: | ||
| if resp.err != nil { | ||
| t.Error(err) | ||
| } | ||
| if !bytes.Equal(resp.buf, expect) { | ||
| t.Fatalf("got unexpected respone data, exepcted %q, got %q", string(expect), string(resp.buf)) | ||
| } | ||
| } | ||
| } | ||
|
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| type testFdPayload struct { | ||
| Fds []int64 `protobuf:"varint,1,opt,name=fds,proto3"` | ||
| } | ||
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| func (r *testFdPayload) Reset() { *r = testFdPayload{} } | ||
| func (r *testFdPayload) String() string { return fmt.Sprintf("%+#v", r) } | ||
| func (r *testFdPayload) ProtoMessage() {} | ||
|
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| type testingServerFd struct { | ||
| respData []byte | ||
| } | ||
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| func (s *testingServerFd) Test(ctx context.Context, req *testFdPayload) error { | ||
| for i, fd := range req.Fds { | ||
| f := os.NewFile(uintptr(fd), "TEST_FILE_"+strconv.Itoa(i)) | ||
| go func() { | ||
| f.Write(s.respData) | ||
| f.Close() | ||
| }() | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| type testFdClient struct { | ||
| client *Client | ||
| } | ||
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| func (c *testFdClient) Test(ctx context.Context, files ...*os.File) error { | ||
| fds, err := c.client.Sendfd(ctx, files) | ||
| if err != nil { | ||
| return fmt.Errorf("error sending fds: %w", err) | ||
| } | ||
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| tp := testFdPayload{} | ||
| return c.client.Call(ctx, "Test", "Test", &testFdPayload{Fds: fds}, &tp) | ||
| } | ||
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| func handleTestSendRecvFd(l net.Listener) error { | ||
| s, err := NewServer() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| testImpl := &testingServerFd{respData: []byte("hello")} | ||
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| s.Register("Test", map[string]Method{ | ||
| "Test": func(ctx context.Context, unmarshal func(interface{}) error) (interface{}, error) { | ||
| req := &testFdPayload{} | ||
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| if err := unmarshal(req); err != nil { | ||
| return nil, err | ||
| } | ||
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| return &testFdPayload{}, testImpl.Test(ctx, req) | ||
| }, | ||
| }) | ||
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| return s.Serve(context.TODO(), l) | ||
| } |
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