forked from istio/istio
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
* echo: add UDP support While we don't support UDP today, it is still useful to have in our standard client/server to test various UDP things (in the future, Istio sidecars proxying the UDP, of course). * lint
- Loading branch information
1 parent
82cf692
commit bbd1dcf
Showing
8 changed files
with
300 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // Copyright Istio 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 endpoint | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "os" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/google/uuid" | ||
|
|
||
| "istio.io/istio/pkg/test/echo" | ||
| "istio.io/istio/pkg/test/util/retry" | ||
| ) | ||
|
|
||
| var _ Instance = &udpInstance{} | ||
|
|
||
| type udpInstance struct { | ||
| Config | ||
| l net.PacketConn | ||
| } | ||
|
|
||
| func newUDP(config Config) Instance { | ||
| return &udpInstance{ | ||
| Config: config, | ||
| } | ||
| } | ||
|
|
||
| func (s *udpInstance) GetConfig() Config { | ||
| return s.Config | ||
| } | ||
|
|
||
| func (s *udpInstance) Start(onReady OnReadyFunc) error { | ||
| var listener net.PacketConn | ||
| var port int | ||
| var err error | ||
| if s.Port.TLS { | ||
| return fmt.Errorf("TLS not supported for UDP") | ||
| } | ||
| // Listen on the given port and update the port if it changed from what was passed in. | ||
| listener, port, err = listenUDPAddress(s.ListenerIP, s.Port.Port) | ||
| // Store the actual listening port back to the argument. | ||
| s.Port.Port = port | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| s.l = listener | ||
| epLog.Infof("Listening UDP on %v\n", port) | ||
|
|
||
| // Start serving UDP traffic. | ||
| go func() { | ||
| buf := make([]byte, 2048) | ||
| for { | ||
| _, remote, err := listener.ReadFrom(buf) | ||
| if err != nil { | ||
| epLog.Warn("UDP read failed: " + err.Error()) | ||
| return | ||
| } | ||
|
|
||
| id := uuid.New() | ||
| epLog.WithLabels("remote", remote, "id", id).Infof("UDP Request") | ||
|
|
||
| responseFields := s.getResponseFields(remote) | ||
| if _, err := listener.WriteTo([]byte(responseFields), remote); err != nil { | ||
| epLog.WithLabels("id", id).Warnf("UDP failed writing echo response: %v", err) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| // Notify the WaitGroup once the port has transitioned to ready. | ||
| go s.awaitReady(onReady, listener.LocalAddr().String()) | ||
| return nil | ||
| } | ||
|
|
||
| func (s *udpInstance) getResponseFields(conn net.Addr) string { | ||
| ip, _, _ := net.SplitHostPort(conn.String()) | ||
| // Write non-request fields specific to the instance | ||
| respFields := map[echo.Field]string{ | ||
| echo.StatusCodeField: strconv.Itoa(http.StatusOK), | ||
| echo.ClusterField: s.Cluster, | ||
| echo.IstioVersionField: s.IstioVersion, | ||
| echo.ServiceVersionField: s.Version, | ||
| echo.ServicePortField: strconv.Itoa(s.Port.Port), | ||
| echo.IPField: ip, | ||
| echo.ProtocolField: "UDP", | ||
| } | ||
|
|
||
| if hostname, err := os.Hostname(); err == nil { | ||
| respFields[echo.HostnameField] = hostname | ||
| } | ||
|
|
||
| var out strings.Builder | ||
| for field, val := range respFields { | ||
| val := fmt.Sprintf("%s=%s\n", string(field), val) | ||
| _, _ = out.WriteString(val) | ||
| } | ||
| return out.String() | ||
| } | ||
|
|
||
| func (s *udpInstance) Close() error { | ||
| if s.l != nil { | ||
| _ = s.l.Close() | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (s *udpInstance) awaitReady(onReady OnReadyFunc, address string) { | ||
| defer onReady() | ||
|
|
||
| err := retry.UntilSuccess(func() error { | ||
| conn, err := net.Dial("udp", address) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer func() { _ = conn.Close() }() | ||
|
|
||
| // Server is up now, we're ready. | ||
| return nil | ||
| }, retry.Timeout(readyTimeout), retry.Delay(readyInterval)) | ||
|
|
||
| if err != nil { | ||
| epLog.Errorf("readiness failed for endpoint %s: %v", address, err) | ||
| } else { | ||
| epLog.Infof("ready for UDP endpoint %s", address) | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| // Copyright Istio 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 forwarder | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| "istio.io/istio/pkg/test/echo" | ||
| "istio.io/istio/pkg/test/echo/common" | ||
| "istio.io/istio/pkg/test/echo/proto" | ||
| ) | ||
|
|
||
| var _ protocol = &udpProtocol{} | ||
|
|
||
| type udpProtocol struct { | ||
| e *executor | ||
| } | ||
|
|
||
| func newUDPProtocol(e *executor) protocol { | ||
| return &udpProtocol{e: e} | ||
| } | ||
|
|
||
| func (c *udpProtocol) ForwardEcho(ctx context.Context, cfg *Config) (*proto.ForwardEchoResponse, error) { | ||
| return doForward(ctx, cfg, c.e, c.makeRequest) | ||
| } | ||
|
|
||
| func (c *udpProtocol) makeRequest(ctx context.Context, cfg *Config, requestID int) (string, error) { | ||
| conn, err := newUDPConnection(cfg) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer func() { _ = conn.Close() }() | ||
|
|
||
| msgBuilder := strings.Builder{} | ||
| echo.ForwarderURLField.WriteForRequest(&msgBuilder, requestID, cfg.Request.Url) | ||
|
|
||
| if cfg.Request.Message != "" { | ||
| echo.ForwarderMessageField.WriteForRequest(&msgBuilder, requestID, cfg.Request.Message) | ||
| } | ||
|
|
||
| // Apply per-request timeout to calculate deadline for reads/writes. | ||
| ctx, cancel := context.WithTimeout(ctx, cfg.timeout) | ||
| defer cancel() | ||
|
|
||
| // Apply the deadline to the connection. | ||
| deadline, _ := ctx.Deadline() | ||
| if err := conn.SetWriteDeadline(deadline); err != nil { | ||
| return msgBuilder.String(), err | ||
| } | ||
| if err := conn.SetReadDeadline(deadline); err != nil { | ||
| return msgBuilder.String(), err | ||
| } | ||
|
|
||
| // Make sure the client writes something to the buffer | ||
| message := "HelloWorld" | ||
| if cfg.Request.Message != "" { | ||
| message = cfg.Request.Message | ||
| } | ||
|
|
||
| if _, err := conn.Write([]byte(message + "\n")); err != nil { | ||
| fwLog.Warnf("UDP write failed: %v", err) | ||
| return msgBuilder.String(), err | ||
| } | ||
| var resBuffer bytes.Buffer | ||
| buf := make([]byte, 1024+len(message)) | ||
| n, err := conn.Read(buf) | ||
| if err != nil && err != io.EOF { | ||
| fwLog.Warnf("UDP read failed (already read %d bytes): %v", len(resBuffer.String()), err) | ||
| return msgBuilder.String(), err | ||
| } | ||
| resBuffer.Write(buf[:n]) | ||
|
|
||
| // format the output for forwarder response | ||
| for _, line := range strings.Split(string(buf[:n]), "\n") { | ||
| if line != "" { | ||
| echo.WriteBodyLine(&msgBuilder, requestID, line) | ||
| } | ||
| } | ||
|
|
||
| msg := msgBuilder.String() | ||
| expected := fmt.Sprintf("%s=%d", string(echo.StatusCodeField), http.StatusOK) | ||
| if cfg.Request.ExpectedResponse != nil { | ||
| expected = cfg.Request.ExpectedResponse.GetValue() | ||
| } | ||
| if !strings.Contains(msg, expected) { | ||
| return msg, fmt.Errorf("expect to recv message with %s, got %s. Return EOF", expected, msg) | ||
| } | ||
| return msg, nil | ||
| } | ||
|
|
||
| func (c *udpProtocol) Close() error { | ||
| return nil | ||
| } | ||
|
|
||
| func newUDPConnection(cfg *Config) (net.Conn, error) { | ||
| address := cfg.Request.Url[len(cfg.scheme+"://"):] | ||
|
|
||
| if cfg.secure { | ||
| return nil, fmt.Errorf("TLS not available") | ||
| } | ||
|
|
||
| ctx, cancel := context.WithTimeout(context.Background(), common.ConnectionTimeout) | ||
| defer cancel() | ||
| return newDialer(cfg).DialContext(ctx, "udp", address) | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters