diff --git a/arduino/monitors/null.go b/arduino/monitors/null.go new file mode 100644 index 00000000000..14c3e44085b --- /dev/null +++ b/arduino/monitors/null.go @@ -0,0 +1,70 @@ +// This file is part of arduino-cli. +// +// Copyright 2021 ARDUINO SA (http://www.arduino.cc/) +// +// This software is released under the GNU General Public License version 3, +// which covers the main part of arduino-cli. +// The terms of this license can be found at: +// https://www.gnu.org/licenses/gpl-3.0.en.html +// +// You can be released from the requirements of the above licenses by purchasing +// a commercial license. Buying such a license is mandatory if you want to +// modify or otherwise use the software for commercial activities involving the +// Arduino software without disclosing the source code of your own applications. +// To purchase a commercial license, send an email to license@arduino.cc. + +package monitors + +import ( + "log" + "time" +) + +// NullMonitor outputs zeros at a constant rate and discards anything sent +type NullMonitor struct { + started time.Time + sent int + bps float64 +} + +// OpenNullMonitor creates a monitor that outputs the same character at a fixed +// rate. +func OpenNullMonitor(bytesPerSecondRate float64) *NullMonitor { + log.Printf("Started streaming at %f\n", bytesPerSecondRate) + return &NullMonitor{ + started: time.Now(), + bps: bytesPerSecondRate, + } +} + +// Close the connection +func (mon *NullMonitor) Close() error { + return nil +} + +// Read bytes from the port +func (mon *NullMonitor) Read(bytes []byte) (int, error) { + for { + elapsed := time.Now().Sub(mon.started).Seconds() + n := int(elapsed*mon.bps) - mon.sent + if n == 0 { + // Delay until the next char... + time.Sleep(time.Millisecond) + continue + } + if len(bytes) < n { + n = len(bytes) + } + mon.sent += n + for i := 0; i < n; i++ { + bytes[i] = 0 + } + return n, nil + } +} + +// Write bytes to the port +func (mon *NullMonitor) Write(bytes []byte) (int, error) { + // Discard all chars + return len(bytes), nil +} diff --git a/commands/daemon/monitor.go b/commands/daemon/monitor.go index 3f62e57b6d9..531ab3ea077 100644 --- a/commands/daemon/monitor.go +++ b/commands/daemon/monitor.go @@ -16,8 +16,9 @@ package daemon import ( - "fmt" + "errors" "io" + "sync/atomic" "github.com/arduino/arduino-cli/arduino/monitors" rpc "github.com/arduino/arduino-cli/rpc/monitor" @@ -39,7 +40,7 @@ func (s *MonitorService) StreamingOpen(stream rpc.Monitor_StreamingOpenServer) e // ensure it's a config message and not data config := msg.GetMonitorConfig() if config == nil { - return fmt.Errorf("first message must contain monitor configuration, not data") + return errors.New("first message must contain monitor configuration, not data") } // select which type of monitor we need @@ -61,6 +62,16 @@ func (s *MonitorService) StreamingOpen(stream rpc.Monitor_StreamingOpenServer) e if mon, err = monitors.OpenSerialMonitor(config.GetTarget(), int(baudRate)); err != nil { return err } + + case rpc.MonitorConfig_NULL: + if addCfg, ok := config.GetAdditionalConfig().AsMap()["OutputRate"]; !ok { + mon = monitors.OpenNullMonitor(100.0) // 100 bytes per second as default + } else if outputRate, ok := addCfg.(float64); !ok { + return errors.New("OutputRate in Null monitor must be a float64") + } else { + // get the Monitor instance + mon = monitors.OpenNullMonitor(outputRate) + } } // we'll use these channels to communicate with the goroutines @@ -68,6 +79,17 @@ func (s *MonitorService) StreamingOpen(stream rpc.Monitor_StreamingOpenServer) e streamClosed := make(chan error) targetClosed := make(chan error) + // set rate limiting window + bufferSize := int(config.GetRecvRateLimitBuffer()) + rateLimitEnabled := (bufferSize > 0) + if !rateLimitEnabled { + bufferSize = 1024 + } + buffer := make([]byte, bufferSize) + bufferUsed := 0 + + var writeSlots int32 + // now we can read the other messages and re-route to the monitor... go func() { for { @@ -84,6 +106,11 @@ func (s *MonitorService) StreamingOpen(stream rpc.Monitor_StreamingOpenServer) e break } + if rateLimitEnabled { + // Increase rate limiter write slots + atomic.AddInt32(&writeSlots, msg.GetRecvAcknowledge()) + } + if _, err := mon.Write(msg.GetData()); err != nil { // error writing to target targetClosed <- err @@ -94,27 +121,58 @@ func (s *MonitorService) StreamingOpen(stream rpc.Monitor_StreamingOpenServer) e // ...and read from the monitor and forward to the output stream go func() { - buf := make([]byte, 8) + dropBuffer := make([]byte, 10240) + dropped := 0 for { - n, err := mon.Read(buf) - if err != nil { - // error reading from target - targetClosed <- err - break + if bufferUsed < bufferSize { + if n, err := mon.Read(buffer[bufferUsed:]); err != nil { + // error reading from target + targetClosed <- err + break + } else if n == 0 { + // target was closed + targetClosed <- nil + break + } else { + bufferUsed += n + } + } else { + // FIXME: a very rare condition but still... + // we may be waiting here while, in the meantime, a transmit slot is + // freed: in this case the (filled) buffer will stay in the server + // until the following Read exits (-> the next char arrives from the + // monitor). + + if n, err := mon.Read(dropBuffer); err != nil { + // error reading from target + targetClosed <- err + break + } else if n == 0 { + // target was closed + targetClosed <- nil + break + } else { + dropped += n + } } - if n == 0 { - // target was closed - targetClosed <- nil - break - } - - if err = stream.Send(&rpc.StreamingOpenResp{ - Data: buf[:n], - }); err != nil { - // error sending to stream - streamClosed <- err - break + slots := atomic.LoadInt32(&writeSlots) + if !rateLimitEnabled || slots > 0 { + if err = stream.Send(&rpc.StreamingOpenResp{ + Data: buffer[:bufferUsed], + Dropped: int32(dropped), + }); err != nil { + // error sending to stream + streamClosed <- err + break + } + bufferUsed = 0 + dropped = 0 + + // Rate limit, filling all the available window + if rateLimitEnabled { + slots = atomic.AddInt32(&writeSlots, -1) + } } } }() diff --git a/commands/daemon/term_example/go.mod b/commands/daemon/term_example/go.mod new file mode 100644 index 00000000000..073c55f41eb --- /dev/null +++ b/commands/daemon/term_example/go.mod @@ -0,0 +1,11 @@ +module github.com/arduino/arduino-cli/term_example + +go 1.16 + +replace github.com/arduino/arduino-cli => ../../.. + +require ( + github.com/arduino/arduino-cli v0.0.0-20200109150215-ffa84fdaab21 + google.golang.org/grpc v1.27.0 + google.golang.org/protobuf v1.25.0 +) diff --git 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v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/commands/daemon/term_example/main.go b/commands/daemon/term_example/main.go new file mode 100644 index 00000000000..0a27364fef4 --- /dev/null +++ b/commands/daemon/term_example/main.go @@ -0,0 +1,96 @@ +// This file is part of arduino-cli. +// +// Copyright 2021 ARDUINO SA (http://www.arduino.cc/) +// +// This software is released under the GNU General Public License version 3, +// which covers the main part of arduino-cli. +// The terms of this license can be found at: +// https://www.gnu.org/licenses/gpl-3.0.en.html +// +// You can be released from the requirements of the above licenses by purchasing +// a commercial license. Buying such a license is mandatory if you want to +// modify or otherwise use the software for commercial activities involving the +// Arduino software without disclosing the source code of your own applications. +// To purchase a commercial license, send an email to license@arduino.cc. + +package main + +import ( + "context" + "fmt" + "log" + "time" + + "github.com/arduino/arduino-cli/rpc/monitor" + "google.golang.org/grpc" + "google.golang.org/protobuf/types/known/structpb" +) + +var ( + dataDir string +) + +// This program exercise monitor rate limiting functionality. + +func main() { + conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure(), grpc.WithBlock()) + if err != nil { + log.Fatal("error connecting to arduino-cli rpc server, you can start it by running `arduino-cli daemon`") + } + defer conn.Close() + + // Open a monitor instance + mon := monitor.NewMonitorClient(conn) + stream, err := mon.StreamingOpen(context.Background()) + if err != nil { + log.Fatal("Error opening stream:", err) + } + + additionalConf, err := structpb.NewStruct( + map[string]interface{}{"OutputRate": float64(1000000)}, + ) + if err != nil { + log.Fatal("Error creating config:", err) + } + + if err := stream.Send(&monitor.StreamingOpenReq{ + Content: &monitor.StreamingOpenReq_MonitorConfig{ + MonitorConfig: &monitor.MonitorConfig{ + Type: monitor.MonitorConfig_NULL, + AdditionalConfig: additionalConf, + RecvRateLimitBuffer: 1024, + }, + }, + }); err != nil { + log.Fatal("Error opening stream:", err) + } + + if err := stream.Send(&monitor.StreamingOpenReq{ + Content: &monitor.StreamingOpenReq_RecvAcknowledge{ + RecvAcknowledge: 5, + }, + }); err != nil { + log.Fatal("Error replenishing recv window:", err) + } + + for { + r, err := stream.Recv() + if err != nil { + log.Fatal("Error receiving from server:", err) + } + if l := len(r.Data); l > 0 { + fmt.Printf("RECV %d bytes\n", l) + } + if r.Dropped > 0 { + fmt.Printf("DROPPED %d bytes!!!\n", r.Dropped) + } + if err := stream.Send(&monitor.StreamingOpenReq{ + Content: &monitor.StreamingOpenReq_RecvAcknowledge{ + RecvAcknowledge: 1, + }, + }); err != nil { + log.Fatal("Error replenishing recv window:", err) + } + time.Sleep(5 * time.Millisecond) + } +} diff --git a/rpc/monitor/monitor.pb.go b/rpc/monitor/monitor.pb.go index 9ac0cb7da6b..dfb912d6e1c 100644 --- a/rpc/monitor/monitor.pb.go +++ b/rpc/monitor/monitor.pb.go @@ -49,15 +49,18 @@ type MonitorConfig_TargetType int32 const ( MonitorConfig_SERIAL MonitorConfig_TargetType = 0 + MonitorConfig_NULL MonitorConfig_TargetType = 99 ) // Enum value maps for MonitorConfig_TargetType. var ( MonitorConfig_TargetType_name = map[int32]string{ - 0: "SERIAL", + 0: "SERIAL", + 99: "NULL", } MonitorConfig_TargetType_value = map[string]int32{ "SERIAL": 0, + "NULL": 99, } ) @@ -103,6 +106,7 @@ type StreamingOpenReq struct { // Types that are assignable to Content: // *StreamingOpenReq_MonitorConfig // *StreamingOpenReq_Data + // *StreamingOpenReq_RecvAcknowledge Content isStreamingOpenReq_Content `protobuf_oneof:"content"` } @@ -159,6 +163,13 @@ func (x *StreamingOpenReq) GetData() []byte { return nil } +func (x *StreamingOpenReq) GetRecvAcknowledge() int32 { + if x, ok := x.GetContent().(*StreamingOpenReq_RecvAcknowledge); ok { + return x.RecvAcknowledge + } + return 0 +} + type isStreamingOpenReq_Content interface { isStreamingOpenReq_Content() } @@ -175,10 +186,18 @@ type StreamingOpenReq_Data struct { Data []byte `protobuf:"bytes,2,opt,name=data,proto3,oneof"` } +type StreamingOpenReq_RecvAcknowledge struct { + // When the rate limiter is enabled, this parameter is used to report the + // number of successfully processed StreamingOpenResp messages (with data). + RecvAcknowledge int32 `protobuf:"varint,3,opt,name=recv_acknowledge,json=recvAcknowledge,proto3,oneof"` +} + func (*StreamingOpenReq_MonitorConfig) isStreamingOpenReq_Content() {} func (*StreamingOpenReq_Data) isStreamingOpenReq_Content() {} +func (*StreamingOpenReq_RecvAcknowledge) isStreamingOpenReq_Content() {} + // Tells the monitor which target to open and provides additional parameters // that might be needed to configure the target or the monitor itself. type MonitorConfig struct { @@ -192,6 +211,11 @@ type MonitorConfig struct { // Additional parameters that might be needed to configure the target or the // monitor itself. AdditionalConfig *_struct.Struct `protobuf:"bytes,3,opt,name=additionalConfig,proto3" json:"additionalConfig,omitempty"` + // This parameter indicates how many bytes should be buffered on the server side + // before dropping. If >0 then the server will enable a rate limiter and will send + // incoming data to the client only when the client allows it: see the + // StreamingOpenReq.recv_acknowledge parameter for details. + RecvRateLimitBuffer int32 `protobuf:"varint,4,opt,name=recv_rate_limit_buffer,json=recvRateLimitBuffer,proto3" json:"recv_rate_limit_buffer,omitempty"` } func (x *MonitorConfig) Reset() { @@ -247,6 +271,13 @@ func (x *MonitorConfig) GetAdditionalConfig() *_struct.Struct { return nil } +func (x *MonitorConfig) GetRecvRateLimitBuffer() int32 { + if x != nil { + return x.RecvRateLimitBuffer + } + return 0 +} + // type StreamingOpenResp struct { state protoimpl.MessageState @@ -255,6 +286,11 @@ type StreamingOpenResp struct { // The data received from the target. Data []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"` + // The number of bytes dropped. + // During regular updates this number should be 0, but in case the + // client is not able to process the recv window quickly enough this + // parameter will report the number of dropped bytes. + Dropped int32 `protobuf:"varint,2,opt,name=dropped,proto3" json:"dropped,omitempty"` } func (x *StreamingOpenResp) Reset() { @@ -296,6 +332,13 @@ func (x *StreamingOpenResp) GetData() []byte { return nil } +func (x *StreamingOpenResp) GetDropped() int32 { + if x != nil { + return x.Dropped + } + return 0 +} + var File_monitor_monitor_proto protoreflect.FileDescriptor var file_monitor_monitor_proto_rawDesc = []byte{ @@ -303,7 +346,7 @@ var file_monitor_monitor_proto_rawDesc = []byte{ 0x72, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x16, 0x63, 0x63, 0x2e, 0x61, 0x72, 0x64, 0x75, 0x69, 0x6e, 0x6f, 0x2e, 0x63, 0x6c, 0x69, 0x2e, 0x6d, 0x6f, 0x6e, 0x69, 0x74, 0x6f, 0x72, 0x1a, 0x1c, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, - 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enum TargetType { SERIAL = 0; } + enum TargetType { + SERIAL = 0; + NULL = 99; + } // The target name. string target = 1; @@ -58,10 +65,22 @@ message MonitorConfig { // Additional parameters that might be needed to configure the target or the // monitor itself. google.protobuf.Struct additionalConfig = 3; + + // This parameter indicates how many bytes should be buffered on the server side + // before dropping. If >0 then the server will enable a rate limiter and will send + // incoming data to the client only when the client allows it: see the + // StreamingOpenReq.recv_acknowledge parameter for details. + int32 recv_rate_limit_buffer = 4; } // message StreamingOpenResp { // The data received from the target. bytes data = 1; + + // The number of bytes dropped. + // During regular updates this number should be 0, but in case the + // client is not able to process the recv window quickly enough this + // parameter will report the number of dropped bytes. + int32 dropped = 2; } \ No newline at end of file