github.com/m3db/m3@v1.5.0/src/dbnode/network/server/tchannelthrift/context.go (about)

     1  // Copyright (c) 2016 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 tchannelthrift
    22  
    23  import (
    24  	stdctx "context"
    25  	"time"
    26  
    27  	"github.com/m3db/m3/src/x/context"
    28  
    29  	apachethrift "github.com/apache/thrift/lib/go/thrift"
    30  	"github.com/uber/tchannel-go"
    31  	"github.com/uber/tchannel-go/thrift"
    32  )
    33  
    34  const (
    35  	contextKey = "m3dbcontext"
    36  )
    37  
    38  // RegisterServer will register a tchannel thrift server and create and close M3DB contexts per request
    39  func RegisterServer(channel *tchannel.Channel, service thrift.TChanServer, contextPool context.Pool) {
    40  	server := thrift.NewServer(channel)
    41  	server.Register(service, thrift.OptPostResponse(postResponseFn))
    42  	server.SetContextFn(func(ctx stdctx.Context, method string, headers map[string]string) thrift.Context {
    43  		xCtx := contextPool.Get()
    44  		xCtx.SetGoContext(ctx)
    45  		ctxWithValue := stdctx.WithValue(ctx, contextKey, xCtx) //nolint: staticcheck
    46  		return thrift.WithHeaders(ctxWithValue, headers)
    47  	})
    48  }
    49  
    50  // NewContext returns a new thrift context and cancel func with embedded M3DB context
    51  func NewContext(timeout time.Duration) (thrift.Context, stdctx.CancelFunc) {
    52  	tctx, cancel := thrift.NewContext(timeout)
    53  	xCtx := context.NewWithGoContext(tctx)
    54  	ctxWithValue := stdctx.WithValue(tctx, contextKey, xCtx) //nolint: staticcheck
    55  	return thrift.WithHeaders(ctxWithValue, nil), cancel
    56  }
    57  
    58  // Context returns an M3DB context from the thrift context
    59  func Context(ctx thrift.Context) context.Context {
    60  	return ctx.Value(contextKey).(context.Context)
    61  }
    62  
    63  func postResponseFn(ctx stdctx.Context, method string, response apachethrift.TStruct) {
    64  	value := ctx.Value(contextKey)
    65  	inner := value.(context.Context)
    66  	inner.Close()
    67  }