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8ebc7bbad0
It would be nice to follow a single schema for naming context functions. In the trace package we followed the form FooFromContext and ContextWithFoo. Do the same in the correlation package. The schema WithFoo is mainly used for functions following the options pattern. Not sure about a name of the NewContext function, though. For now I have left it alone. Co-authored-by: Rahul Patel <rghetia@yahoo.com>
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
// Copyright 2020, OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package correlation
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import (
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"context"
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"go.opentelemetry.io/otel/api/core"
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)
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type correlationsType struct{}
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var correlationsKey = &correlationsType{}
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// ContextWithMap returns a context with the Map entered into it.
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func ContextWithMap(ctx context.Context, m Map) context.Context {
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return context.WithValue(ctx, correlationsKey, m)
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}
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// NewContext returns a context with the map from passed context
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// updated with the passed key-value pairs.
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func NewContext(ctx context.Context, keyvalues ...core.KeyValue) context.Context {
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return ContextWithMap(ctx, MapFromContext(ctx).Apply(MapUpdate{
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MultiKV: keyvalues,
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}))
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}
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// MapFromContext gets the current Map from a Context.
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func MapFromContext(ctx context.Context) Map {
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if m, ok := ctx.Value(correlationsKey).(Map); ok {
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return m
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}
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return NewEmptyMap()
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}
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