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package correlation
import (
"context"
)
type ctxKey int
const (
keyCorrelationID ctxKey = iota
keyClientName
)
func extractFromContextByKey(ctx context.Context, key ctxKey) string {
value := ctx.Value(key)
str, ok := value.(string)
if !ok {
return ""
}
return str
}
// ExtractFromContext extracts the CollectionID from the provided context.
// Returns an empty string if it's unable to extract the CorrelationID for
// any reason.
func ExtractFromContext(ctx context.Context) string {
return extractFromContextByKey(ctx, keyCorrelationID)
}
// ExtractFromContextOrGenerate extracts the CollectionID from the provided context or generates a random id if
// context does not contain one.
func ExtractFromContextOrGenerate(ctx context.Context) string {
id := ExtractFromContext(ctx)
if id == "" {
id = SafeRandomID()
}
return id
}
// ContextWithCorrelation will create a new context containing the provided Correlation-ID value.
// This can be extracted using ExtractFromContext.
func ContextWithCorrelation(ctx context.Context, correlationID string) context.Context {
return context.WithValue(ctx, keyCorrelationID, correlationID)
}
// ExtractClientNameFromContext extracts client name from incoming context.
// It will return an empty string if client name does not exist in the context.
func ExtractClientNameFromContext(ctx context.Context) string {
return extractFromContextByKey(ctx, keyClientName)
}
// ContextWithClientName will create a new context containing client_name metadata.
func ContextWithClientName(ctx context.Context, clientName string) context.Context {
return context.WithValue(ctx, keyClientName, clientName)
}
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