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caad413499
Summary: This diff implements getBlob on top of the mercurial rust datapack code. It adds a C++ binding on top of the rust code to make it easier to use and hooks it up in the hg backing store. Need to figure this out for our opensource and windows builds: * Need to teach them how to build and link the rust code * need to add a windows version of the methods that accept paths; this is just a matter of adding a WCHAR version of the functions. Reviewed By: strager Differential Revision: D10433450 fbshipit-source-id: 45ce34fb9c383ea6018a0ca858581e0fe11ef3b5
88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
// Copyright 2004-present Facebook. All Rights Reserved
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#pragma once
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#include <folly/Optional.h>
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#include <folly/Range.h>
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/** This module makes available to C++ some of the Rust ConfigSet API */
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namespace facebook {
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namespace eden {
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struct HgRcBytesStruct;
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struct HgRcConfigSetStruct;
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/** Encapsulates a rust Bytes object returned from the configparser library.
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* HgRcBytes can be converted to a folly::ByteRange */
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class HgRcBytes {
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public:
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explicit HgRcBytes(HgRcBytesStruct* ptr);
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// Explicitly reference the data as a ByteRange
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folly::ByteRange bytes() const;
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// Explicitly reference the data as a StringPiece
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folly::StringPiece stringPiece() const {
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return folly::StringPiece{bytes()};
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}
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operator folly::ByteRange() const {
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return bytes();
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}
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operator folly::StringPiece() const {
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return stringPiece();
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}
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private:
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struct Deleter {
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void operator()(HgRcBytesStruct*) const;
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};
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std::unique_ptr<HgRcBytesStruct, Deleter> ptr_;
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};
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class HgRcConfigError : public std::runtime_error {
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public:
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using std::runtime_error::runtime_error;
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};
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/** Encapsulates a ConfigSet instance from the configparser library.
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* It is initially empty but can have multiple configuration files
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* loaed into it via loadPath().
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*/
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class HgRcConfigSet {
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public:
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HgRcConfigSet();
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// Attempt to load configuration from path.
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// Throws HgRcConfigError if there were error(s)
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void loadPath(const char* path);
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// Attempt to load the system configuration files
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// Throws HgRcConfigError if there were error(s)
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void loadSystem();
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// Attempt to load the user's configuration files
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// Throws HgRcConfigError if there were error(s)
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void loadUser();
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// Return the configuration value for the specified section/name
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folly::Optional<HgRcBytes> get(
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folly::ByteRange section,
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folly::ByteRange name) const noexcept;
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// Return the configuration value for the specified section/name
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folly::Optional<HgRcBytes> get(
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folly::StringPiece section,
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folly::StringPiece name) const noexcept {
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return get(folly::ByteRange{section}, folly::ByteRange{name});
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}
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private:
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struct Deleter {
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void operator()(HgRcConfigSetStruct*) const;
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};
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std::unique_ptr<HgRcConfigSetStruct, Deleter> ptr_;
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};
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} // namespace eden
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} // namespace facebook
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