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* Implement registerValidPath().

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This commit is contained in:
Eelco Dolstra 2010-02-19 16:04:51 +00:00
parent 268f9aaf28
commit 762cee72cc
3 changed files with 96 additions and 112 deletions
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199
src/libstore/local-store.cc
View file

@ -74,6 +74,24 @@ SQLiteStmt::~SQLiteStmt()
}
/* Helper class to ensure that prepared statements are reset when
leaving the scope that uses them. Unfinished prepared statements
prevent transactions from being aborted, and can cause locks to be
kept when they should be released. */
struct SQLiteStmtUse
{
SQLiteStmt & stmt;
SQLiteStmtUse(SQLiteStmt & stmt) : stmt(stmt)
{
stmt.reset();
}
~SQLiteStmtUse()
{
stmt.reset();
}
};
struct SQLiteTxn
{
bool active;
@ -223,10 +241,10 @@ int LocalStore::getSchema()
}
#include "schema.sql.hh"
void LocalStore::initSchema()
{
#include "schema.sql.hh"
if (sqlite3_exec(db, (const char *) schema, 0, 0, 0) != SQLITE_OK)
throw SQLiteError(db, "initialising database schema");
@ -237,9 +255,9 @@ void LocalStore::initSchema()
void LocalStore::prepareStatements()
{
stmtRegisterValidPath.create(db,
"insert into ValidPaths (path, hash, registrationTime, deriver) values (?, ?, ?, ?);");
"insert or replace into ValidPaths (path, hash, registrationTime, deriver) values (?, ?, ?, ?);");
stmtAddReference.create(db,
"insert into Refs (referrer, reference) values (?, ?);");
"insert or replace into Refs (referrer, reference) values (?, ?);");
stmtQueryPathInfo.create(db,
"select id, hash, registrationTime, deriver from ValidPaths where path = ?;");
stmtQueryReferences.create(db,
@ -336,75 +354,69 @@ void LocalStore::registerValidPath(const Path & path,
}
void LocalStore::registerValidPath(const ValidPathInfo & info, bool ignoreValidity)
unsigned long long LocalStore::addValidPath(const ValidPathInfo & info)
{
abort();
#if 0
Path infoFile = infoFileFor(info.path);
ValidPathInfo oldInfo;
if (pathExists(infoFile)) oldInfo = queryPathInfo(info.path);
/* Note that it's possible for infoFile to already exist. */
/* Acquire a lock on each referrer file. This prevents those
paths from being invalidated. (It would be a violation of the
store invariants if we registered info.path as valid while some
of its references are invalid.) NB: there can be no deadlock
here since we're acquiring the locks in sorted order. */
PathSet lockNames;
foreach (PathSet::const_iterator, i, info.references)
if (*i != info.path) lockNames.insert(referrersFileFor(*i));
PathLocks referrerLocks(lockNames);
referrerLocks.setDeletion(true);
string refs;
foreach (PathSet::const_iterator, i, info.references) {
if (!refs.empty()) refs += " ";
refs += *i;
if (!ignoreValidity && *i != info.path && !isValidPath(*i))
throw Error(format("cannot register `%1%' as valid, because its reference `%2%' isn't valid")
% info.path % *i);
/* Update the referrer mapping for *i. This must be done
before the info file is written to maintain the invariant
that if `path' is a valid path, then all its references
have referrer mappings back to `path'. A " " is prefixed
to separate it from the previous entry. It's not suffixed
to deal with interrupted partial writes to this file. */
if (oldInfo.references.find(*i) == oldInfo.references.end())
appendReferrer(*i, info.path, false);
SQLiteStmtUse use(stmtRegisterValidPath);
if (sqlite3_bind_text(stmtRegisterValidPath, 1, info.path.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
string h = "sha256:" + printHash(info.hash);
if (sqlite3_bind_text(stmtRegisterValidPath, 2, h.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (sqlite3_bind_int(stmtRegisterValidPath, 3, info.registrationTime) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (info.deriver != "") {
if (sqlite3_bind_text(stmtRegisterValidPath, 4, info.deriver.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
} else {
if (sqlite3_bind_null(stmtRegisterValidPath, 4) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
}
if (sqlite3_step(stmtRegisterValidPath) != SQLITE_DONE)
throw SQLiteError(db, format("registering valid path `%1%' in database") % info.path);
return sqlite3_last_insert_rowid(db);
}
void LocalStore::addReference(unsigned long long referrer, unsigned long long reference)
{
SQLiteStmtUse use(stmtAddReference);
if (sqlite3_bind_int(stmtAddReference, 1, referrer) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (sqlite3_bind_int(stmtAddReference, 2, reference) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (sqlite3_step(stmtAddReference) != SQLITE_DONE)
throw SQLiteError(db, "adding reference to database");
}
void LocalStore::registerValidPath(const ValidPathInfo & info)
{
assert(info.hash.type == htSHA256);
ValidPathInfo info2(info);
if (info2.registrationTime == 0) info2.registrationTime = time(0);
string s = (format(
"Hash: sha256:%1%\n"
"References: %2%\n"
"Deriver: %3%\n"
"Registered-At: %4%\n")
% printHash(info.hash) % refs % info.deriver %
(oldInfo.registrationTime ? oldInfo.registrationTime : time(0))).str();
SQLiteTxn txn(db);
/* Atomically rewrite the info file. */
Path tmpFile = tmpFileForAtomicUpdate(infoFile);
writeFile(tmpFile, s, doFsync);
if (rename(tmpFile.c_str(), infoFile.c_str()) == -1)
throw SysError(format("cannot rename `%1%' to `%2%'") % tmpFile % infoFile);
#endif
unsigned long long id = addValidPath(info2);
foreach (PathSet::const_iterator, i, info2.references) {
ValidPathInfo ref = queryPathInfo(*i);
addReference(id, ref.id);
}
txn.commit();
}
void LocalStore::registerFailedPath(const Path & path)
{
abort();
throw Error("not implemented");
}
bool LocalStore::hasPathFailed(const Path & path)
{
abort();
throw Error("not implemented");
}
@ -424,13 +436,13 @@ Hash parseHashField(const Path & path, const string & s)
ValidPathInfo LocalStore::queryPathInfo(const Path & path)
{
ValidPathInfo res;
res.path = path;
ValidPathInfo info;
info.path = path;
assertStorePath(path);
/* Get the path info. */
stmtQueryPathInfo.reset();
SQLiteStmtUse use1(stmtQueryPathInfo);
if (sqlite3_bind_text(stmtQueryPathInfo, 1, path.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
@ -439,39 +451,39 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & path)
if (r == SQLITE_DONE) throw Error(format("path `%1%' is not valid") % path);
if (r != SQLITE_ROW) throw SQLiteError(db, "querying path in database");
unsigned int id = sqlite3_column_int(stmtQueryPathInfo, 0);
info.id = sqlite3_column_int(stmtQueryPathInfo, 0);
const char * s = (const char *) sqlite3_column_text(stmtQueryPathInfo, 1);
assert(s);
res.hash = parseHashField(path, s);
info.hash = parseHashField(path, s);
res.registrationTime = sqlite3_column_int(stmtQueryPathInfo, 2);
info.registrationTime = sqlite3_column_int(stmtQueryPathInfo, 2);
s = (const char *) sqlite3_column_text(stmtQueryPathInfo, 3);
if (s) res.deriver = s;
if (s) info.deriver = s;
/* Get the references. */
stmtQueryReferences.reset();
SQLiteStmtUse use2(stmtQueryReferences);
if (sqlite3_bind_int(stmtQueryReferences, 1, id) != SQLITE_OK)
if (sqlite3_bind_int(stmtQueryReferences, 1, info.id) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
while ((r = sqlite3_step(stmtQueryReferences)) == SQLITE_ROW) {
s = (const char *) sqlite3_column_text(stmtQueryReferences, 0);
assert(s);
res.references.insert(s);
info.references.insert(s);
}
if (r != SQLITE_DONE)
throw SQLiteError(db, format("error getting references of `%1%'") % path);
return res;
return info;
}
bool LocalStore::isValidPath(const Path & path)
{
stmtQueryPathInfo.reset();
SQLiteStmtUse use(stmtQueryPathInfo);
if (sqlite3_bind_text(stmtQueryPathInfo, 1, path.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
int res = sqlite3_step(stmtQueryPathInfo);
@ -514,7 +526,7 @@ void LocalStore::queryReferrers(const Path & path, PathSet & referrers)
{
assertStorePath(path);
stmtQueryReferrers.reset();
SQLiteStmtUse use(stmtQueryReferrers);
if (sqlite3_bind_text(stmtQueryReferrers, 1, path.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
@ -687,7 +699,7 @@ void LocalStore::registerValidPaths(const ValidPathInfos & infos)
there are no referrers. */
void LocalStore::invalidatePath(const Path & path)
{
abort();
throw Error("not implemented");
#if 0
debug(format("invalidating path `%1%'") % path);
@ -1010,7 +1022,8 @@ Path LocalStore::importPath(bool requireSignature, Source & source)
void LocalStore::deleteFromStore(const Path & path, unsigned long long & bytesFreed,
unsigned long long & blocksFreed)
{
abort();
throw Error("not implemented");
#if 0
bytesFreed = 0;
@ -1077,13 +1090,6 @@ void LocalStore::verifyStore(bool checkContents)
/* Functions for upgrading from the pre-SQLite database. */
static Path infoFileFor(const Path & path)
{
string baseName = baseNameOf(path);
return (format("%1%/info/%2%") % nixDBPath % baseName).str();
}
PathSet LocalStore::queryValidPathsOld()
{
PathSet paths;
@ -1100,7 +1106,8 @@ ValidPathInfo LocalStore::queryPathInfoOld(const Path & path)
res.path = path;
/* Read the info file. */
Path infoFile = infoFileFor(path);
string baseName = baseNameOf(path);
Path infoFile = (format("%1%/info/%2%") % nixDBPath % baseName).str();
if (!pathExists(infoFile))
throw Error(format("path `%1%' is not valid") % path);
string info = readFile(infoFile);
@ -1152,27 +1159,7 @@ void LocalStore::upgradeStore6()
foreach (PathSet::iterator, i, validPaths) {
ValidPathInfo info = queryPathInfoOld(*i);
stmtRegisterValidPath.reset();
if (sqlite3_bind_text(stmtRegisterValidPath, 1, i->c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
string h = "sha256:" + printHash(info.hash);
if (sqlite3_bind_text(stmtRegisterValidPath, 2, h.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (sqlite3_bind_int(stmtRegisterValidPath, 3, info.registrationTime) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (info.deriver != "") {
if (sqlite3_bind_text(stmtRegisterValidPath, 4, info.deriver.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
} else {
if (sqlite3_bind_null(stmtRegisterValidPath, 4) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
}
if (sqlite3_step(stmtRegisterValidPath) != SQLITE_DONE)
throw SQLiteError(db, "registering valid path in database");
pathToId[*i] = sqlite3_last_insert_rowid(db);
pathToId[*i] = addValidPath(info);
std::cerr << ".";
}
@ -1180,19 +1167,11 @@ void LocalStore::upgradeStore6()
foreach (PathSet::iterator, i, validPaths) {
ValidPathInfo info = queryPathInfoOld(*i);
foreach (PathSet::iterator, j, info.references) {
stmtAddReference.reset();
if (sqlite3_bind_int(stmtAddReference, 1, pathToId[*i]) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (pathToId.find(*j) == pathToId.end())
throw Error(format("path `%1%' referenced by `%2%' is invalid") % *j % *i);
if (sqlite3_bind_int(stmtAddReference, 2, pathToId[*j]) != SQLITE_OK)
throw SQLiteError(db, "binding argument");
if (sqlite3_step(stmtAddReference) != SQLITE_DONE)
throw SQLiteError(db, "adding reference to database");
addReference(pathToId[*i], pathToId[*j]);
}
std::cerr << ".";
}

6
src/libstore/local-store.hh
View file

@ -198,7 +198,11 @@ private:
void prepareStatements();
void registerValidPath(const ValidPathInfo & info, bool ignoreValidity = false);
unsigned long long addValidPath(const ValidPathInfo & info);
void addReference(unsigned long long referrer, unsigned long long reference);
void registerValidPath(const ValidPathInfo & info);
ValidPathInfo queryPathInfo(const Path & path);

1
src/libstore/store-api.hh
View file

@ -333,6 +333,7 @@ struct ValidPathInfo
Hash hash;
PathSet references;
time_t registrationTime;
unsigned long long id; // internal use only
ValidPathInfo() : registrationTime(0) { }
};