go.uber.org/yarpc@v1.72.1/encoding/raw/inbound.go (about)

     1  // Copyright (c) 2022 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package raw
    22  
    23  import (
    24  	"context"
    25  	"io/ioutil"
    26  
    27  	encodingapi "go.uber.org/yarpc/api/encoding"
    28  	"go.uber.org/yarpc/api/transport"
    29  	"go.uber.org/yarpc/pkg/errors"
    30  )
    31  
    32  // rawUnaryHandler adapts a Handler into a transport.UnaryHandler
    33  type rawUnaryHandler struct{ UnaryHandler }
    34  
    35  // rawOnewayHandler adapts a Handler into a transport.OnewayHandler
    36  type rawOnewayHandler struct{ OnewayHandler }
    37  
    38  func (r rawUnaryHandler) Handle(ctx context.Context, treq *transport.Request, rw transport.ResponseWriter) error {
    39  	if err := errors.ExpectEncodings(treq, Encoding); err != nil {
    40  		return err
    41  	}
    42  
    43  	ctx, call := encodingapi.NewInboundCall(ctx)
    44  	if err := call.ReadFromRequest(treq); err != nil {
    45  		return err
    46  	}
    47  
    48  	reqBody, err := ioutil.ReadAll(treq.Body)
    49  	if err != nil {
    50  		return err
    51  	}
    52  
    53  	resBody, appErr := r.UnaryHandler(ctx, reqBody)
    54  	if err := call.WriteToResponse(rw); err != nil {
    55  		return err
    56  	}
    57  
    58  	// we want to return the appErr if it exists as this is what
    59  	// the previous behavior was so we deprioritize this error
    60  	var writeErr error
    61  	if len(resBody) > 0 {
    62  		_, writeErr = rw.Write(resBody)
    63  	}
    64  	if appErr != nil {
    65  		rw.SetApplicationError()
    66  		return appErr
    67  	}
    68  	return writeErr
    69  }
    70  
    71  func (r rawOnewayHandler) HandleOneway(ctx context.Context, treq *transport.Request) error {
    72  	if err := errors.ExpectEncodings(treq, Encoding); err != nil {
    73  		return err
    74  	}
    75  
    76  	ctx, call := encodingapi.NewInboundCall(ctx)
    77  	if err := call.ReadFromRequest(treq); err != nil {
    78  		return err
    79  	}
    80  
    81  	reqBody, err := ioutil.ReadAll(treq.Body)
    82  	if err != nil {
    83  		return err
    84  	}
    85  
    86  	return r.OnewayHandler(ctx, reqBody)
    87  }