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gecko-dev/dom/quota/QuotaCommon.h

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17 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_quota_quotacommon_h__
#define mozilla_dom_quota_quotacommon_h__
#include "nsCOMPtr.h"
#include "nsDebug.h"
#include "nsPrintfCString.h"
#include "nsString.h"
#include "nsTArray.h"
#define MOZ_UNIQUE_VAR(base) MOZ_CONCAT(base, __LINE__)
#define MOZ_REMOVE_PAREN(X) MOZ_REMOVE_PAREN_HELPER2(MOZ_REMOVE_PAREN_HELPER X)
#define MOZ_REMOVE_PAREN_HELPER(...) MOZ_REMOVE_PAREN_HELPER __VA_ARGS__
#define MOZ_REMOVE_PAREN_HELPER2(...) MOZ_REMOVE_PAREN_HELPER3(__VA_ARGS__)
#define MOZ_REMOVE_PAREN_HELPER3(...) MOZ_REMOVE_PAREN_HELPER4_##__VA_ARGS__
#define MOZ_REMOVE_PAREN_HELPER4_MOZ_REMOVE_PAREN_HELPER
#define BEGIN_QUOTA_NAMESPACE \
namespace mozilla { \
namespace dom { \
namespace quota {
#define END_QUOTA_NAMESPACE \
} /* namespace quota */ \
} /* namespace dom */ \
} /* namespace mozilla */
#define USING_QUOTA_NAMESPACE using namespace mozilla::dom::quota;
#define DSSTORE_FILE_NAME ".DS_Store"
#define DESKTOP_FILE_NAME ".desktop"
#define DESKTOP_INI_FILE_NAME "desktop.ini"
#define THUMBS_DB_FILE_NAME "thumbs.db"
#define QM_WARNING(...) \
do { \
nsPrintfCString str(__VA_ARGS__); \
mozilla::dom::quota::ReportInternalError(__FILE__, __LINE__, str.get()); \
NS_WARNING(str.get()); \
} while (0)
#define UNKNOWN_FILE_WARNING(_leafName) \
NS_WARNING( \
nsPrintfCString("Something (%s) in the directory that doesn't belong!", \
NS_ConvertUTF16toUTF8(_leafName).get()) \
.get())
// This macro should be used in directory traversals for files or directories
// that are unknown for given directory traversal. It should only be called
// after all known (directory traversal specific) files or directories have
// been checked and handled.
#ifdef DEBUG
# define WARN_IF_FILE_IS_UNKNOWN(_file) \
mozilla::dom::quota::WarnIfFileIsUnknown(_file, __FILE__, __LINE__)
#else
# define WARN_IF_FILE_IS_UNKNOWN(_file) Result<bool, nsresult>(false)
#endif
/**
* There are multiple ways to handle unrecoverable conditions:
* 1. Using NS_ENSURE_* macros
*
* Mainly:
* - NS_ENSURE_SUCCESS
* - NS_ENSURE_SUCCESS_VOID
* - NS_ENSURE_TRUE
* - NS_ENSURE_TRUE_VOID
*
* Typical use cases:
*
* nsresult MyFunc1(nsIFile& aFile) {
* bool exists;
* nsresult rv = aFile.Exists(&exists);
* NS_ENSURE_SUCCESS(rv, rv);
* NS_ENSURE_TRUE(exists, NS_ERROR_FAILURE);
*
* return NS_OK;
* }
*
* nsresult MyFunc2(nsIFile& aFile) {
* bool exists;
* nsresult rv = aFile.Exists(&exists);
* NS_ENSURE_SUCCESS(rv, NS_ERROR_UNEXPECTED);
* NS_ENSURE_TRUE(exists, NS_ERROR_UNEXPECTED);
*
* return NS_OK;
* }
*
* void MyFunc3(nsIFile& aFile) {
* bool exists;
* nsresult rv = aFile.Exists(&exists);
* NS_ENSURE_SUCCESS_VOID(rv);
* NS_ENSURE_TRUE_VOID(exists);
* }
*
* 2. Using NS_WARN_IF macro with own control flow handling
*
* Typical use cases:
*
* nsresult MyFunc1(nsIFile& aFile) {
* bool exists;
* nsresult rv = aFile.Exists(&exists);
* if (NS_WARN_IF(NS_FAILED(rv)) {
* return rv;
* }
* if (NS_WARN_IF(!exists) {
* return NS_ERROR_FAILURE;
* }
*
* return NS_OK;
* }
*
* nsresult MyFunc2(nsIFile& aFile) {
* bool exists;
* nsresult rv = aFile.Exists(&exists);
* if (NS_WARN_IF(NS_FAILED(rv)) {
* return NS_ERROR_UNEXPECTED;
* }
* if (NS_WARN_IF(!exists) {
* return NS_ERROR_UNEXPECTED;
* }
*
* return NS_OK;
* }
*
* void MyFunc3(nsIFile& aFile) {
* bool exists;
* nsresult rv = aFile.Exists(&exists);
* if (NS_WARN_IF(NS_FAILED(rv)) {
* return;
* }
* if (NS_WARN_IF(!exists) {
* return;
* }
* }
*
* 3. Using MOZ_TRY/MOZ_TRY_VAR macros
*
* Typical use cases:
*
* nsresult MyFunc1(nsIFile& aFile) {
* bool exists;
* MOZ_TRY(aFile.Exists(&exists));
* // Note, exists can't be checked directly using MOZ_TRY without the Result
* // extension defined in quota manager
* MOZ_TRY(OkIf(exists), NS_ERROR_FAILURE);
*
* return NS_OK;
* }
*
* nsresult MyFunc2(nsIFile& aFile) {
* // MOZ_TRY can't return a custom return value
*
* return NS_OK;
* }
*
* void MyFunc3(nsIFile& aFile) {
* // MOZ_TRY can't return void
* }
*
* 4. Using QM_TRY/QM_TRY_VAR macros (Quota manager specific, defined below)
*
* Typical use cases:
*
* nsresult MyFunc1(nsIFile& aFile) {
* bool exists;
* QM_TRY(aFile.Exists(&exists));
* QM_TRY(OkIf(exists), NS_ERROR_FAILURE);
*
* return NS_OK;
* }
*
* nsresult MyFunc2(nsIFile& aFile) {
* bool exists;
* QM_TRY(aFile.Exists(&exists), NS_ERROR_UNEXPECTED);
* QM_TRY(OkIf(exists), NS_ERROR_UNEXPECTED);
*
* return NS_OK;
* }
*
* void MyFunc3(nsIFile& aFile) {
* bool exists;
* QM_TRY(aFile.Exists(&exists), QM_VOID);
* QM_TRY(OkIf(exists), QM_VOID);
* }
*
* QM_TRY/QM_TRY_VAR is like MOZ_TRY/MOZ_TRY_VAR but if an error occurs it
* additionally calls a generic function HandleError to handle the error and it
* can be used to return custom return values as well.
* HandleError currently only warns in debug builds, it will report to the
* browser console and telemetry in the future.
* The other advantage of QM_TRY/QM_TRY_VAR is that a local nsresult is not
* needed at all in all cases, all calls can be wrapped directly. If an error
* occurs, the warning contains a concrete call instead of the rv local
* variable. For example:
*
* 1. WARNING: NS_ENSURE_SUCCESS(rv, rv) failed with result 0x80004005
* (NS_ERROR_FAILURE): file XYZ, line N
*
* 2. WARNING: 'NS_FAILED(rv)', file XYZ, line N
*
* 3. Nothing (MOZ_TRY doesn't warn)
*
* 4. WARNING: Error: 'aFile.Exists(&exists)', file XYZ, line N
*
* It's highly recommended to use QM_TRY/QM_TRY_VAR in new code for quota
* manager and quota clients. Existing code should be incrementally converted
* as needed.
*
* QM_TRY_VOID/QM_TRY_VAR_VOID is not defined on purpose since it's possible to
* use QM_TRY/QM_TRY_VAR even in void functions. However, QM_TRY(Task(), )
* would look odd so it's recommended to use a dummy define QM_VOID that
* evaluates to nothing instead: QM_TRY(Task(), QM_VOID)
*/
#define QM_VOID
#define QM_MISSING_ARGS(...) \
do { \
static_assert(false, "Did you forget arguments?"); \
} while (0)
// QM_TRY_PROPAGATE_ERR and QM_TRY_CUSTOM_RET_VAR macros are implementation
// details of QM_TRY and shouldn't be used directly.
// Handles the two args case when the eror is propagated.
#define QM_TRY_PROPAGATE_ERR(ns, expr) \
do { \
auto mozTryTempResult_ = ::mozilla::ToResult(expr); \
if (MOZ_UNLIKELY(mozTryTempResult_.isErr())) { \
ns::HandleError(nsLiteralCString(#expr), nsLiteralCString(__FILE__), \
__LINE__); \
return mozTryTempResult_.propagateErr(); \
} \
} while (0)
// Handles the three args case when a custom return value needs to be returned
#define QM_TRY_CUSTOM_RET_VAR(ns, expr, customRetVal) \
do { \
auto mozTryTempResult_ = ::mozilla::ToResult(expr); \
if (MOZ_UNLIKELY(mozTryTempResult_.isErr())) { \
ns::HandleError(nsLiteralCString(#expr), nsLiteralCString(__FILE__), \
__LINE__); \
return customRetVal; \
} \
} while (0)
// Chooses the final implementation macro for given argument count.
// It can be used by other modules to define module specific error handling.
#define QM_TRY_META(...) \
MOZ_ARG_5(, ##__VA_ARGS__, QM_TRY_CUSTOM_RET_VAR(__VA_ARGS__), \
QM_TRY_PROPAGATE_ERR(__VA_ARGS__), QM_MISSING_ARGS(__VA_ARGS__), \
QM_MISSING_ARGS(__VA_ARGS__))
/**
* QM_TRY(expr[, customRetVal]) is the C++ equivalent of Rust's `try!(expr);`.
* First, it evaluates expr, which must produce a Result value. On success, it
* discards the result altogether. On error, it calls HandleError and returns
* an error Result from the enclosing function or a custom return value (if the
* second arg was passed).
*/
#define QM_TRY(...) QM_TRY_META(mozilla::dom::quota, ##__VA_ARGS__)
// QM_TRY_VAR_PROPAGATE_ERR and QM_TRY_VAR_CUSTOM_RET_VAR macros are
// implementation details of QM_TRY_VAR and shouldn't be used directly.
// Handles the three args case when the eror is propagated.
#define QM_TRY_VAR_PROPAGATE_ERR(ns, target, expr) \
auto MOZ_UNIQUE_VAR(tryVarResult) = (expr); \
if (MOZ_UNLIKELY(MOZ_UNIQUE_VAR(tryVarResult).isErr())) { \
ns::HandleError(nsLiteralCString(#expr), nsLiteralCString(__FILE__), \
__LINE__); \
return MOZ_UNIQUE_VAR(tryVarResult).propagateErr(); \
} \
MOZ_REMOVE_PAREN(target) = MOZ_UNIQUE_VAR(tryVarResult).unwrap();
// Handles the four args case when a custom return value needs to be returned
#define QM_TRY_VAR_CUSTOM_RET_VAR(ns, target, expr, customRetVal) \
auto MOZ_UNIQUE_VAR(tryVarResult) = (expr); \
if (MOZ_UNLIKELY(MOZ_UNIQUE_VAR(tryVarResult).isErr())) { \
ns::HandleError(nsLiteralCString(#expr), nsLiteralCString(__FILE__), \
__LINE__); \
return customRetVal; \
} \
MOZ_REMOVE_PAREN(target) = MOZ_UNIQUE_VAR(tryVarResult).unwrap();
// Chooses the final implementation macro for given argument count.
// It can be used by other modules to define module specific error handling.
#define QM_TRY_VAR_META(...) \
MOZ_ARG_6(, ##__VA_ARGS__, QM_TRY_VAR_CUSTOM_RET_VAR(__VA_ARGS__), \
QM_TRY_VAR_PROPAGATE_ERR(__VA_ARGS__), \
QM_MISSING_ARGS(__VA_ARGS__), QM_MISSING_ARGS(__VA_ARGS__), \
QM_MISSING_ARGS(__VA_ARGS__))
/**
* QM_TRY_VAR(target, expr[, customRetVal]) is the C++ equivalent of Rust's
* `target = try!(expr);`. First, it evaluates expr, which must produce a
* Result value. On success, the result's success value is assigned to target.
* On error, it calls HandleError and returns the error result or a custom
* return value (if the third arg was passed). |target| must be an lvalue.
*/
#define QM_TRY_VAR(...) QM_TRY_VAR_META(mozilla::dom::quota, ##__VA_ARGS__)
// Telemetry probes to collect number of failure during the initialization.
#ifdef NIGHTLY_BUILD
# define REPORT_TELEMETRY_INIT_ERR(_key, _label) \
mozilla::Telemetry::AccumulateCategoricalKeyed( \
mozilla::dom::quota::_key, \
mozilla::Telemetry::LABELS_QM_INIT_TELEMETRY_ERROR::_label);
# define REPORT_TELEMETRY_ERR_IN_INIT(_initializing, _key, _label) \
do { \
if (_initializing) { \
REPORT_TELEMETRY_INIT_ERR(_key, _label) \
} \
} while (0)
# define RECORD_IN_NIGHTLY(_recorder, _status) \
do { \
if (NS_SUCCEEDED(_recorder)) { \
_recorder = _status; \
} \
} while (0)
# define CONTINUE_IN_NIGHTLY_RETURN_IN_OTHERS(_dummy) continue
# define RETURN_STATUS_OR_RESULT(_status, _rv) \
return NS_FAILED(_status) ? _status : _rv
#else
# define REPORT_TELEMETRY_INIT_ERR(_key, _label) \
{}
# define REPORT_TELEMETRY_ERR_IN_INIT(_initializing, _key, _label) \
{}
# define RECORD_IN_NIGHTLY(_dummy, _status) \
{}
# define CONTINUE_IN_NIGHTLY_RETURN_IN_OTHERS(_rv) return _rv
# define RETURN_STATUS_OR_RESULT(_status, _rv) return _rv
#endif
class nsIEventTarget;
class nsIFile;
namespace mozilla {
class LogModule;
struct NotOk {};
// Allow MOZ_TRY/QM_TRY to handle `bool` values by wrapping them with OkIf.
// TODO: Maybe move this to mfbt/ResultExtensions.h
inline Result<Ok, NotOk> OkIf(bool aValue) {
if (aValue) {
return Ok();
}
return Err(NotOk());
}
/**
* Allow MOZ_TRY/QM_TRY to handle `nsresult` values and optionally enforce
* success for some special values.
* This is useful in cases when a specific error shouldn't abort execution of a
* function and we need to distinguish between a normal success and a forced
* success.
*
* Typical use case:
*
* nsresult MyFunc(nsIFile& aDirectory) {
* bool exists;
* QM_TRY_VAR(exists,
* ToResult(aDirectory.Create(nsIFile::DIRECTORY_TYPE, 0755),
* [](auto aValue) {
* return aValue == NS_ERROR_FILE_ALREADY_EXISTS;
* }));
*
* if (exists) {
* QM_TRY(aDirectory.IsDirectory(&isDirectory));
* QM_TRY(isDirectory, NS_ERROR_UNEXPECTED);
* }
*
* return NS_OK;
* }
*
* TODO: Maybe move this to mfbt/ResultExtensions.h
*/
class Okish {
const bool mEnforced;
public:
explicit Okish(bool aEnforced) : mEnforced(aEnforced) {}
MOZ_IMPLICIT operator bool() const { return mEnforced; }
};
template <typename SuccessEnforcer>
Result<Okish, nsresult> ToResult(nsresult aValue,
const SuccessEnforcer& aSuccessEnforcer) {
if (NS_SUCCEEDED(aValue)) {
return Okish(/* aEnforced */ false);
}
if (aSuccessEnforcer(aValue)) {
return Okish(/* aEnforced */ true);
}
return Err(aValue);
}
namespace dom {
namespace quota {
extern const char kQuotaGenericDelimiter;
// Telemetry keys to indicate types of errors.
#ifdef NIGHTLY_BUILD
extern const nsLiteralCString kQuotaInternalError;
extern const nsLiteralCString kQuotaExternalError;
#else
// No need for these when we're not collecting telemetry.
# define kQuotaInternalError
# define kQuotaExternalError
#endif
class BackgroundThreadObject {
protected:
nsCOMPtr<nsIEventTarget> mOwningThread;
public:
void AssertIsOnOwningThread() const
#ifdef DEBUG
;
#else
{
}
#endif
nsIEventTarget* OwningThread() const;
protected:
BackgroundThreadObject();
explicit BackgroundThreadObject(nsIEventTarget* aOwningThread);
};
void AssertIsOnIOThread();
void AssertCurrentThreadOwnsQuotaMutex();
bool IsOnIOThread();
void ReportInternalError(const char* aFile, uint32_t aLine, const char* aStr);
LogModule* GetQuotaManagerLogger();
void AnonymizeCString(nsACString& aCString);
class AnonymizedCString : public nsCString {
public:
explicit AnonymizedCString(const nsACString& aCString) : nsCString(aCString) {
AnonymizeCString(*this);
}
};
void AnonymizeOriginString(nsACString& aOriginString);
class AnonymizedOriginString : public nsCString {
public:
explicit AnonymizedOriginString(const nsACString& aOriginString)
: nsCString(aOriginString) {
AnonymizeOriginString(*this);
}
};
template <typename T>
void StringifyTableKeys(const T& aTable, nsACString& aResult) {
bool first = true;
for (auto iter = aTable.ConstIter(); !iter.Done(); iter.Next()) {
if (first) {
first = false;
} else {
aResult.Append(", "_ns);
}
const auto& key = iter.Get()->GetKey();
aResult.Append(key);
}
}
#ifdef XP_WIN
void CacheUseDOSDevicePathSyntaxPrefValue();
#endif
Result<nsCOMPtr<nsIFile>, nsresult> QM_NewLocalFile(const nsAString& aPath);
class IntString : public nsAutoString {
public:
explicit IntString(int64_t aInteger) { AppendInt(aInteger); }
};
class IntCString : public nsAutoCString {
public:
explicit IntCString(int64_t aInteger) { AppendInt(aInteger); }
};
#ifdef DEBUG
Result<bool, nsresult> WarnIfFileIsUnknown(nsIFile& aFile,
const char* aSourceFile,
int32_t aSourceLine);
#endif
void HandleError(const nsLiteralCString& aExpr,
const nsLiteralCString& aSourceFile, int32_t aSourceLine);
} // namespace quota
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_quota_quotacommon_h__
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