github.com/m3db/m3@v1.5.0/src/dbnode/network/server/httpjson/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 httpjson
    22  
    23  import (
    24  	m3dbcontext "github.com/m3db/m3/src/x/context"
    25  
    26  	apachethrift "github.com/apache/thrift/lib/go/thrift"
    27  	"github.com/uber/tchannel-go/thrift"
    28  	"golang.org/x/net/context"
    29  )
    30  
    31  const (
    32  	contextKey = "m3dbcontext"
    33  )
    34  
    35  // NewDefaultContextFn returns a function that will create M3DB contexts per request
    36  func NewDefaultContextFn(contextPool m3dbcontext.Pool) ContextFn {
    37  	return func(ctx context.Context, method string, headers map[string]string) thrift.Context {
    38  		ctxWithValue := context.WithValue(ctx, interface{}(contextKey), contextPool.Get())
    39  		return thrift.WithHeaders(ctxWithValue, headers)
    40  	}
    41  }
    42  
    43  // DefaulPostResponseFn will close M3DB contexts per request
    44  func DefaulPostResponseFn(ctx context.Context, method string, response apachethrift.TStruct) {
    45  	value := ctx.Value(contextKey)
    46  	inner := value.(m3dbcontext.Context)
    47  	inner.Close()
    48  }