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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
// +build go1.7
package newrelic
import (
"context"
"net/http"
"github.com/newrelic/go-agent/internal"
)
// NewContext returns a new Context that carries the provided transaction.
func NewContext(ctx context.Context, txn Transaction) context.Context {
return context.WithValue(ctx, internal.TransactionContextKey, txn)
}
// FromContext returns the Transaction from the context if present, and nil
// otherwise.
func FromContext(ctx context.Context) Transaction {
h, _ := ctx.Value(internal.TransactionContextKey).(Transaction)
if nil != h {
return h
}
// If we couldn't find a transaction using
// internal.TransactionContextKey, try with
// internal.GinTransactionContextKey. Unfortunately, gin.Context.Set
// requires a string key, so we cannot use
// internal.TransactionContextKey in nrgin.Middleware. We check for two
// keys (rather than turning internal.TransactionContextKey into a
// string key) because context.WithValue will cause golint to complain
// if used with a string key.
h, _ = ctx.Value(internal.GinTransactionContextKey).(Transaction)
return h
}
// RequestWithTransactionContext adds the transaction to the request's context.
func RequestWithTransactionContext(req *http.Request, txn Transaction) *http.Request {
ctx := req.Context()
ctx = NewContext(ctx, txn)
return req.WithContext(ctx)
}
func transactionFromRequestContext(req *http.Request) Transaction {
var txn Transaction
if nil != req {
txn = FromContext(req.Context())
}
return txn
}
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