Abseil Common Libraries (C++) (grcp 依赖)
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52 lines
2.2 KiB
52 lines
2.2 KiB
5 years ago
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// Copyright 2019 The Abseil 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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// https://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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#ifndef ABSL_STATUS_STATUS_PAYLOAD_PRINTER_H_
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#define ABSL_STATUS_STATUS_PAYLOAD_PRINTER_H_
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#include <string>
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#include "absl/strings/cord.h"
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#include "absl/strings/string_view.h"
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#include "absl/types/optional.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace status_internal {
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// By default, `Status::ToString` and `operator<<(Status)` print a payload by
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// dumping the type URL and the raw bytes. To help debugging, we provide an
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// extension point, which is a global printer function that can be set by users
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// to specify how to print payloads. The function takes the type URL and the
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// payload as input, and should return a valid human-readable string on success
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// or `absl::nullopt` on failure (in which case it falls back to the default
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// approach of printing the raw bytes).
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// NOTE: This is an internal API and the design is subject to change in the
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// future in a non-backward-compatible way. Since it's only meant for debugging
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// purpose, you should not rely on it in any critical logic.
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using StatusPayloadPrinter = absl::optional<std::string> (*)(absl::string_view,
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const absl::Cord&);
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// Sets the global payload printer. Only one printer should be set per process.
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// If multiple printers are set, it's undefined which one will be used.
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void SetStatusPayloadPrinter(StatusPayloadPrinter);
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// Returns the global payload printer if previously set, otherwise `nullptr`.
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StatusPayloadPrinter GetStatusPayloadPrinter();
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} // namespace status_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_STATUS_STATUS_PAYLOAD_PRINTER_H_
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