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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
* 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/. */
#include <string.h>
#include "mozilla/Telemetry.h"
#include "sqlite3.h"
#include "nsThreadUtils.h"
#include "mozilla/dom/quota/PersistenceType.h"
#include "mozilla/dom/quota/QuotaManager.h"
#include "mozilla/dom/quota/QuotaObject.h"
#include "mozilla/net/IOActivityMonitor.h"
#include "mozilla/IOInterposer.h"
#include "nsEscape.h"
#include "mozilla/StaticPrefs_storage.h"
#ifdef XP_WIN
# include "mozilla/StaticPrefs_dom.h"
#endif
// The last VFS version for which this file has been updated.
#define LAST_KNOWN_VFS_VERSION 3
// The last io_methods version for which this file has been updated.
#define LAST_KNOWN_IOMETHODS_VERSION 3
namespace {
using namespace mozilla;
using namespace mozilla::dom::quota;
using namespace mozilla::net;
struct Histograms {
const char* name;
const Telemetry::HistogramID readB;
const Telemetry::HistogramID writeB;
const Telemetry::HistogramID readMS;
const Telemetry::HistogramID writeMS;
const Telemetry::HistogramID syncMS;
};
#define SQLITE_TELEMETRY(FILENAME, HGRAM) \
{ \
FILENAME, Telemetry::MOZ_SQLITE_##HGRAM##_READ_B, \
Telemetry::MOZ_SQLITE_##HGRAM##_WRITE_B, \
Telemetry::MOZ_SQLITE_##HGRAM##_READ_MS, \
Telemetry::MOZ_SQLITE_##HGRAM##_WRITE_MS, \
Telemetry::MOZ_SQLITE_##HGRAM##_SYNC_MS \
}
Histograms gHistograms[] = {SQLITE_TELEMETRY("places.sqlite", PLACES),
SQLITE_TELEMETRY("cookies.sqlite", COOKIES),
SQLITE_TELEMETRY("webappsstore.sqlite", WEBAPPS),
SQLITE_TELEMETRY(nullptr, OTHER)};
#undef SQLITE_TELEMETRY
/** RAII class for measuring how long io takes on/off main thread
*/
class IOThreadAutoTimer {
public:
/**
* IOThreadAutoTimer measures time spent in IO. Additionally it
* automatically determines whether IO is happening on the main
* thread and picks an appropriate histogram.
*
* @param id takes a telemetry histogram id. The id+1 must be an
* equivalent histogram for the main thread. Eg, MOZ_SQLITE_OPEN_MS
* is followed by MOZ_SQLITE_OPEN_MAIN_THREAD_MS.
*
* @param aOp optionally takes an IO operation to report through the
* IOInterposer. Filename will be reported as NULL, and reference will be
* either "sqlite-mainthread" or "sqlite-otherthread".
*/
explicit IOThreadAutoTimer(
Telemetry::HistogramID aId,
IOInterposeObserver::Operation aOp = IOInterposeObserver::OpNone)
: start(TimeStamp::Now()),
id(aId)
#if defined(MOZ_GECKO_PROFILER) && !defined(XP_WIN)
,
op(aOp)
#endif
{
}
/**
* This constructor is for when we want to report an operation to
* IOInterposer but do not require a telemetry probe.
*
* @param aOp IO Operation to report through the IOInterposer.
*/
explicit IOThreadAutoTimer(IOInterposeObserver::Operation aOp)
: start(TimeStamp::Now()),
id(Telemetry::HistogramCount)
#if defined(MOZ_GECKO_PROFILER) && !defined(XP_WIN)
,
op(aOp)
#endif
{
}
~IOThreadAutoTimer() {
TimeStamp end(TimeStamp::Now());
uint32_t mainThread = NS_IsMainThread() ? 1 : 0;
if (id != Telemetry::HistogramCount) {
Telemetry::AccumulateTimeDelta(
static_cast<Telemetry::HistogramID>(id + mainThread), start, end);
}
// We don't report SQLite I/O on Windows because we have a comprehensive
// mechanism for intercepting I/O on that platform that captures a superset
// of the data captured here.
#if defined(MOZ_GECKO_PROFILER) && !defined(XP_WIN)
if (IOInterposer::IsObservedOperation(op)) {
const char* main_ref = "sqlite-mainthread";
const char* other_ref = "sqlite-otherthread";
// Create observation
IOInterposeObserver::Observation ob(op, start, end,
(mainThread ? main_ref : other_ref));
// Report observation
IOInterposer::Report(ob);
}
#endif /* defined(MOZ_GECKO_PROFILER) && !defined(XP_WIN) */
}
private:
const TimeStamp start;
const Telemetry::HistogramID id;
#if defined(MOZ_GECKO_PROFILER) && !defined(XP_WIN)
IOInterposeObserver::Operation op;
#endif
};
struct telemetry_file {
// Base class. Must be first
sqlite3_file base;
// histograms pertaining to this file
Histograms* histograms;
// quota object for this file
RefPtr<QuotaObject> quotaObject;
// The chunk size for this file. See the documentation for
// sqlite3_file_control() and FCNTL_CHUNK_SIZE.
int fileChunkSize;
// The filename
char* location;
// This contains the vfs that actually does work
sqlite3_file pReal[1];
};
already_AddRefed<QuotaObject> GetQuotaObjectFromName(const char* zName) {
MOZ_ASSERT(zName);
const char* directoryLockIdParam =
sqlite3_uri_parameter(zName, "directoryLockId");
if (!directoryLockIdParam) {
return nullptr;
}
nsresult rv;
const int64_t directoryLockId =
nsDependentCString(directoryLockIdParam).ToInteger64(&rv);
MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
QuotaManager* quotaManager = QuotaManager::Get();
MOZ_ASSERT(quotaManager);
return quotaManager->GetQuotaObject(directoryLockId,
NS_ConvertUTF8toUTF16(zName));
}
void MaybeEstablishQuotaControl(const char* zName, telemetry_file* pFile,
int flags) {
MOZ_ASSERT(pFile);
MOZ_ASSERT(!pFile->quotaObject);
if (!(flags & (SQLITE_OPEN_URI | SQLITE_OPEN_WAL))) {
return;
}
pFile->quotaObject = GetQuotaObjectFromName(zName);
}
/*
** Close a telemetry_file.
*/
int xClose(sqlite3_file* pFile) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
{ // Scope for IOThreadAutoTimer
IOThreadAutoTimer ioTimer(IOInterposeObserver::OpClose);
rc = p->pReal->pMethods->xClose(p->pReal);
}
if (rc == SQLITE_OK) {
delete p->base.pMethods;
p->base.pMethods = nullptr;
p->quotaObject = nullptr;
delete[] p->location;
#ifdef DEBUG
p->fileChunkSize = 0;
#endif
}
return rc;
}
/*
** Read data from a telemetry_file.
*/
int xRead(sqlite3_file* pFile, void* zBuf, int iAmt, sqlite_int64 iOfst) {
telemetry_file* p = (telemetry_file*)pFile;
IOThreadAutoTimer ioTimer(p->histograms->readMS, IOInterposeObserver::OpRead);
int rc;
rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
if (rc == SQLITE_OK && IOActivityMonitor::IsActive()) {
IOActivityMonitor::Read(nsDependentCString(p->location), iAmt);
}
// sqlite likes to read from empty files, this is normal, ignore it.
if (rc != SQLITE_IOERR_SHORT_READ)
Telemetry::Accumulate(p->histograms->readB, rc == SQLITE_OK ? iAmt : 0);
return rc;
}
/*
** Return the current file-size of a telemetry_file.
*/
int xFileSize(sqlite3_file* pFile, sqlite_int64* pSize) {
IOThreadAutoTimer ioTimer(IOInterposeObserver::OpStat);
telemetry_file* p = (telemetry_file*)pFile;
int rc;
rc = p->pReal->pMethods->xFileSize(p->pReal, pSize);
return rc;
}
/*
** Write data to a telemetry_file.
*/
int xWrite(sqlite3_file* pFile, const void* zBuf, int iAmt,
sqlite_int64 iOfst) {
telemetry_file* p = (telemetry_file*)pFile;
IOThreadAutoTimer ioTimer(p->histograms->writeMS,
IOInterposeObserver::OpWrite);
int rc;
if (p->quotaObject) {
MOZ_ASSERT(INT64_MAX - iOfst >= iAmt);
if (!p->quotaObject->MaybeUpdateSize(iOfst + iAmt, /* aTruncate */ false)) {
return SQLITE_FULL;
}
}
rc = p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst);
if (rc == SQLITE_OK && IOActivityMonitor::IsActive()) {
IOActivityMonitor::Write(nsDependentCString(p->location), iAmt);
}
Telemetry::Accumulate(p->histograms->writeB, rc == SQLITE_OK ? iAmt : 0);
if (p->quotaObject && rc != SQLITE_OK) {
NS_WARNING(
"xWrite failed on a quota-controlled file, attempting to "
"update its current size...");
sqlite_int64 currentSize;
if (xFileSize(pFile, &currentSize) == SQLITE_OK) {
DebugOnly<bool> res =
p->quotaObject->MaybeUpdateSize(currentSize, /* aTruncate */ true);
MOZ_ASSERT(res);
}
}
return rc;
}
/*
** Truncate a telemetry_file.
*/
int xTruncate(sqlite3_file* pFile, sqlite_int64 size) {
IOThreadAutoTimer ioTimer(Telemetry::MOZ_SQLITE_TRUNCATE_MS);
telemetry_file* p = (telemetry_file*)pFile;
int rc;
Telemetry::AutoTimer<Telemetry::MOZ_SQLITE_TRUNCATE_MS> timer;
if (p->quotaObject) {
if (p->fileChunkSize > 0) {
// Round up to the smallest multiple of the chunk size that will hold all
// the data.
size =
((size + p->fileChunkSize - 1) / p->fileChunkSize) * p->fileChunkSize;
}
if (!p->quotaObject->MaybeUpdateSize(size, /* aTruncate */ true)) {
return SQLITE_FULL;
}
}
rc = p->pReal->pMethods->xTruncate(p->pReal, size);
if (p->quotaObject) {
if (rc == SQLITE_OK) {
#ifdef DEBUG
// Make sure xTruncate set the size exactly as we calculated above.
sqlite_int64 newSize;
MOZ_ASSERT(xFileSize(pFile, &newSize) == SQLITE_OK);
MOZ_ASSERT(newSize == size);
#endif
} else {
NS_WARNING(
"xTruncate failed on a quota-controlled file, attempting to "
"update its current size...");
if (xFileSize(pFile, &size) == SQLITE_OK) {
DebugOnly<bool> res =
p->quotaObject->MaybeUpdateSize(size, /* aTruncate */ true);
MOZ_ASSERT(res);
}
}
}
return rc;
}
/*
** Sync a telemetry_file.
*/
int xSync(sqlite3_file* pFile, int flags) {
telemetry_file* p = (telemetry_file*)pFile;
IOThreadAutoTimer ioTimer(p->histograms->syncMS,
IOInterposeObserver::OpFSync);
return p->pReal->pMethods->xSync(p->pReal, flags);
}
/*
** Lock a telemetry_file.
*/
int xLock(sqlite3_file* pFile, int eLock) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
rc = p->pReal->pMethods->xLock(p->pReal, eLock);
return rc;
}
/*
** Unlock a telemetry_file.
*/
int xUnlock(sqlite3_file* pFile, int eLock) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
rc = p->pReal->pMethods->xUnlock(p->pReal, eLock);
return rc;
}
/*
** Check if another file-handle holds a RESERVED lock on a telemetry_file.
*/
int xCheckReservedLock(sqlite3_file* pFile, int* pResOut) {
telemetry_file* p = (telemetry_file*)pFile;
int rc = p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut);
return rc;
}
/*
** File control method. For custom operations on a telemetry_file.
*/
int xFileControl(sqlite3_file* pFile, int op, void* pArg) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
// Hook SQLITE_FCNTL_SIZE_HINT for quota-controlled files and do the necessary
// work before passing to the SQLite VFS.
if (op == SQLITE_FCNTL_SIZE_HINT && p->quotaObject) {
sqlite3_int64 hintSize = *static_cast<sqlite3_int64*>(pArg);
sqlite3_int64 currentSize;
rc = xFileSize(pFile, &currentSize);
if (rc != SQLITE_OK) {
return rc;
}
if (hintSize > currentSize) {
rc = xTruncate(pFile, hintSize);
if (rc != SQLITE_OK) {
return rc;
}
}
}
rc = p->pReal->pMethods->xFileControl(p->pReal, op, pArg);
// Grab the file chunk size after the SQLite VFS has approved.
if (op == SQLITE_FCNTL_CHUNK_SIZE && rc == SQLITE_OK) {
p->fileChunkSize = *static_cast<int*>(pArg);
}
#ifdef DEBUG
if (op == SQLITE_FCNTL_SIZE_HINT && p->quotaObject && rc == SQLITE_OK) {
sqlite3_int64 hintSize = *static_cast<sqlite3_int64*>(pArg);
if (p->fileChunkSize > 0) {
hintSize = ((hintSize + p->fileChunkSize - 1) / p->fileChunkSize) *
p->fileChunkSize;
}
sqlite3_int64 currentSize;
MOZ_ASSERT(xFileSize(pFile, &currentSize) == SQLITE_OK);
MOZ_ASSERT(currentSize >= hintSize);
}
#endif
return rc;
}
/*
** Return the sector-size in bytes for a telemetry_file.
*/
int xSectorSize(sqlite3_file* pFile) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
rc = p->pReal->pMethods->xSectorSize(p->pReal);
return rc;
}
/*
** Return the device characteristic flags supported by a telemetry_file.
*/
int xDeviceCharacteristics(sqlite3_file* pFile) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
rc = p->pReal->pMethods->xDeviceCharacteristics(p->pReal);
return rc;
}
/*
** Shared-memory operations.
*/
int xShmLock(sqlite3_file* pFile, int ofst, int n, int flags) {
telemetry_file* p = (telemetry_file*)pFile;
return p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags);
}
int xShmMap(sqlite3_file* pFile, int iRegion, int szRegion, int isWrite,
void volatile** pp) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp);
return rc;
}
void xShmBarrier(sqlite3_file* pFile) {
telemetry_file* p = (telemetry_file*)pFile;
p->pReal->pMethods->xShmBarrier(p->pReal);
}
int xShmUnmap(sqlite3_file* pFile, int delFlag) {
telemetry_file* p = (telemetry_file*)pFile;
int rc;
rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag);
return rc;
}
int xFetch(sqlite3_file* pFile, sqlite3_int64 iOff, int iAmt, void** pp) {
telemetry_file* p = (telemetry_file*)pFile;
MOZ_ASSERT(p->pReal->pMethods->iVersion >= 3);
return p->pReal->pMethods->xFetch(p->pReal, iOff, iAmt, pp);
}
int xUnfetch(sqlite3_file* pFile, sqlite3_int64 iOff, void* pResOut) {
telemetry_file* p = (telemetry_file*)pFile;
MOZ_ASSERT(p->pReal->pMethods->iVersion >= 3);
return p->pReal->pMethods->xUnfetch(p->pReal, iOff, pResOut);
}
int xOpen(sqlite3_vfs* vfs, const char* zName, sqlite3_file* pFile, int flags,
int* pOutFlags) {
IOThreadAutoTimer ioTimer(Telemetry::MOZ_SQLITE_OPEN_MS,
IOInterposeObserver::OpCreateOrOpen);
Telemetry::AutoTimer<Telemetry::MOZ_SQLITE_OPEN_MS> timer;
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
int rc;
telemetry_file* p = (telemetry_file*)pFile;
Histograms* h = nullptr;
// check if the filename is one we are probing for
for (size_t i = 0; i < sizeof(gHistograms) / sizeof(gHistograms[0]); i++) {
h = &gHistograms[i];
// last probe is the fallback probe
if (!h->name) break;
if (!zName) continue;
const char* match = strstr(zName, h->name);
if (!match) continue;
char c = match[strlen(h->name)];
// include -wal/-journal too
if (!c || c == '-') break;
}
p->histograms = h;
MaybeEstablishQuotaControl(zName, p, flags);
rc = orig_vfs->xOpen(orig_vfs, zName, p->pReal, flags, pOutFlags);
if (rc != SQLITE_OK) return rc;
if (zName) {
p->location = new char[7 + strlen(zName) + 1];
strcpy(p->location, "file://");
strcpy(p->location + 7, zName);
} else {
p->location = new char[8];
strcpy(p->location, "file://");
}
if (p->pReal->pMethods) {
sqlite3_io_methods* pNew = new sqlite3_io_methods;
const sqlite3_io_methods* pSub = p->pReal->pMethods;
memset(pNew, 0, sizeof(*pNew));
// If the io_methods version is higher than the last known one, you should
// update this VFS adding appropriate IO methods for any methods added in
// the version change.
pNew->iVersion = pSub->iVersion;
MOZ_ASSERT(pNew->iVersion <= LAST_KNOWN_IOMETHODS_VERSION);
pNew->xClose = xClose;
pNew->xRead = xRead;
pNew->xWrite = xWrite;
pNew->xTruncate = xTruncate;
pNew->xSync = xSync;
pNew->xFileSize = xFileSize;
pNew->xLock = xLock;
pNew->xUnlock = xUnlock;
pNew->xCheckReservedLock = xCheckReservedLock;
pNew->xFileControl = xFileControl;
pNew->xSectorSize = xSectorSize;
pNew->xDeviceCharacteristics = xDeviceCharacteristics;
if (pNew->iVersion >= 2) {
// Methods added in version 2.
pNew->xShmMap = pSub->xShmMap ? xShmMap : 0;
pNew->xShmLock = pSub->xShmLock ? xShmLock : 0;
pNew->xShmBarrier = pSub->xShmBarrier ? xShmBarrier : 0;
pNew->xShmUnmap = pSub->xShmUnmap ? xShmUnmap : 0;
}
if (pNew->iVersion >= 3) {
// Methods added in version 3.
// SQLite 3.7.17 calls these methods without checking for nullptr first,
// so we always define them. Verify that we're not going to call
// nullptrs, though.
MOZ_ASSERT(pSub->xFetch);
pNew->xFetch = xFetch;
MOZ_ASSERT(pSub->xUnfetch);
pNew->xUnfetch = xUnfetch;
}
pFile->pMethods = pNew;
}
return rc;
}
int xDelete(sqlite3_vfs* vfs, const char* zName, int syncDir) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
int rc;
RefPtr<QuotaObject> quotaObject;
if (StringEndsWith(nsDependentCString(zName), "-wal"_ns)) {
quotaObject = GetQuotaObjectFromName(zName);
}
rc = orig_vfs->xDelete(orig_vfs, zName, syncDir);
if (rc == SQLITE_OK && quotaObject) {
MOZ_ALWAYS_TRUE(quotaObject->MaybeUpdateSize(0, /* aTruncate */ true));
}
return rc;
}
int xAccess(sqlite3_vfs* vfs, const char* zName, int flags, int* pResOut) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xAccess(orig_vfs, zName, flags, pResOut);
}
int xFullPathname(sqlite3_vfs* vfs, const char* zName, int nOut, char* zOut) {
#if defined(XP_WIN)
// SQLite uses GetFullPathnameW which also normailizes file path. If a file
// component ends with a dot, it would be removed. However, it's not desired.
//
// And that would result SQLite uses wrong database and quotaObject.
// Note that we are safe to avoid the GetFullPathnameW call for \\?\ prefixed
// paths.
// And note that this hack will be removed once the issue is fixed directly in
// SQLite.
// zName that starts with "//?/" is the case when a file URI was passed and
// zName that starts with "\\?\" is the case when a normal path was passed
// (not file URI).
if (StaticPrefs::dom_quotaManager_overrideXFullPathname() &&
((zName[0] == '/' && zName[1] == '/' && zName[2] == '?' &&
zName[3] == '/') ||
(zName[0] == '\\' && zName[1] == '\\' && zName[2] == '?' &&
zName[3] == '\\'))) {
MOZ_ASSERT(nOut >= vfs->mxPathname);
MOZ_ASSERT(nOut > strlen(zName));
size_t index = 0;
while (zName[index] != '\0') {
if (zName[index] == '/') {
zOut[index] = '\\';
} else {
zOut[index] = zName[index];
}
index++;
}
zOut[index] = '\0';
return SQLITE_OK;
}
#endif
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xFullPathname(orig_vfs, zName, nOut, zOut);
}
void* xDlOpen(sqlite3_vfs* vfs, const char* zFilename) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xDlOpen(orig_vfs, zFilename);
}
void xDlError(sqlite3_vfs* vfs, int nByte, char* zErrMsg) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
orig_vfs->xDlError(orig_vfs, nByte, zErrMsg);
}
void (*xDlSym(sqlite3_vfs* vfs, void* pHdle, const char* zSym))(void) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xDlSym(orig_vfs, pHdle, zSym);
}
void xDlClose(sqlite3_vfs* vfs, void* pHandle) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
orig_vfs->xDlClose(orig_vfs, pHandle);
}
int xRandomness(sqlite3_vfs* vfs, int nByte, char* zOut) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xRandomness(orig_vfs, nByte, zOut);
}
int xSleep(sqlite3_vfs* vfs, int microseconds) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xSleep(orig_vfs, microseconds);
}
int xCurrentTime(sqlite3_vfs* vfs, double* prNow) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xCurrentTime(orig_vfs, prNow);
}
int xGetLastError(sqlite3_vfs* vfs, int nBuf, char* zBuf) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xGetLastError(orig_vfs, nBuf, zBuf);
}
int xCurrentTimeInt64(sqlite3_vfs* vfs, sqlite3_int64* piNow) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xCurrentTimeInt64(orig_vfs, piNow);
}
static int xSetSystemCall(sqlite3_vfs* vfs, const char* zName,
sqlite3_syscall_ptr pFunc) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xSetSystemCall(orig_vfs, zName, pFunc);
}
static sqlite3_syscall_ptr xGetSystemCall(sqlite3_vfs* vfs, const char* zName) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xGetSystemCall(orig_vfs, zName);
}
static const char* xNextSystemCall(sqlite3_vfs* vfs, const char* zName) {
sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
return orig_vfs->xNextSystemCall(orig_vfs, zName);
}
} // namespace
namespace mozilla {
namespace storage {
const char* GetTelemetryVFSName(bool exclusive) {
return exclusive ? "telemetry-vfs-excl" : "telemetry-vfs";
}
UniquePtr<sqlite3_vfs> ConstructTelemetryVFS(bool exclusive) {
#if defined(XP_WIN)
# define EXPECTED_VFS "win32"
# define EXPECTED_VFS_EXCL "win32"
#else
# define EXPECTED_VFS "unix"
# define EXPECTED_VFS_EXCL "unix-excl"
#endif
bool expected_vfs;
sqlite3_vfs* vfs;
if (!exclusive) {
// Use the non-exclusive VFS.
vfs = sqlite3_vfs_find(nullptr);
expected_vfs = vfs->zName && !strcmp(vfs->zName, EXPECTED_VFS);
} else {
vfs = sqlite3_vfs_find(EXPECTED_VFS_EXCL);
expected_vfs = (vfs != nullptr);
}
if (!expected_vfs) {
return nullptr;
}
auto tvfs = MakeUnique<::sqlite3_vfs>();
memset(tvfs.get(), 0, sizeof(::sqlite3_vfs));
// If the VFS version is higher than the last known one, you should update
// this VFS adding appropriate methods for any methods added in the version
// change.
tvfs->iVersion = vfs->iVersion;
MOZ_ASSERT(vfs->iVersion <= LAST_KNOWN_VFS_VERSION);
tvfs->szOsFile =
sizeof(telemetry_file) - sizeof(sqlite3_file) + vfs->szOsFile;
tvfs->mxPathname = vfs->mxPathname;
tvfs->zName = GetTelemetryVFSName(exclusive);
tvfs->pAppData = vfs;
tvfs->xOpen = xOpen;
tvfs->xDelete = xDelete;
tvfs->xAccess = xAccess;
tvfs->xFullPathname = xFullPathname;
tvfs->xDlOpen = xDlOpen;
tvfs->xDlError = xDlError;
tvfs->xDlSym = xDlSym;
tvfs->xDlClose = xDlClose;
tvfs->xRandomness = xRandomness;
tvfs->xSleep = xSleep;
tvfs->xCurrentTime = xCurrentTime;
tvfs->xGetLastError = xGetLastError;
if (tvfs->iVersion >= 2) {
// Methods added in version 2.
tvfs->xCurrentTimeInt64 = xCurrentTimeInt64;
}
if (tvfs->iVersion >= 3) {
// Methods added in version 3.
tvfs->xSetSystemCall = xSetSystemCall;
tvfs->xGetSystemCall = xGetSystemCall;
tvfs->xNextSystemCall = xNextSystemCall;
}
return tvfs;
}
already_AddRefed<QuotaObject> GetQuotaObjectForFile(sqlite3_file* pFile) {
MOZ_ASSERT(pFile);
telemetry_file* p = (telemetry_file*)pFile;
RefPtr<QuotaObject> result = p->quotaObject;
return result.forget();
}
} // namespace storage
} // namespace mozilla