forked from TrueCloudLab/distribution
d0f5aa670b
Our context package predates the establishment of current best practices regarding context usage and it shows. It encourages bad practices such as using contexts to propagate non-request-scoped values like the application version and using string-typed keys for context values. Move the package internal to remove it from the API surface of distribution/v3@v3.0.0 so we are free to iterate on it without being constrained by compatibility. Signed-off-by: Cory Snider <csnider@mirantis.com>
25 lines
717 B
Go
25 lines
717 B
Go
package dcontext
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
)
|
|
|
|
// Since looks up key, which should be a time.Time, and returns the duration
|
|
// since that time. If the key is not found, the value returned will be zero.
|
|
// This is helpful when inferring metrics related to context execution times.
|
|
func Since(ctx context.Context, key interface{}) time.Duration {
|
|
if startedAt, ok := ctx.Value(key).(time.Time); ok {
|
|
return time.Since(startedAt)
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// GetStringValue returns a string value from the context. The empty string
|
|
// will be returned if not found.
|
|
func GetStringValue(ctx context.Context, key interface{}) (value string) {
|
|
if valuev, ok := ctx.Value(key).(string); ok {
|
|
value = valuev
|
|
}
|
|
return value
|
|
}
|