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Eliminate the "store" global variable

Browse source 
Also, move a few free-standing functions into StoreAPI and Derivation.

Also, introduce a non-nullable smart pointer, ref<T>, which is just a
wrapper around std::shared_ptr ensuring that the pointer is never
null. (For reference-counted values, this is better than passing a
"T&", because the latter doesn't maintain the refcount. Usually, the
caller will have a shared_ptr keeping the value alive, but that's not
always the case, e.g., when passing a reference to a std::thread via
std::bind.)
This commit is contained in:
Eelco Dolstra 2016-02-04 14:28:26 +01:00
parent 4f7824c58e
commit c10c61449f
36 changed files with 511 additions and 458 deletions
Download patch file Download diff file Expand all files Collapse all files

91
src/nix-daemon/nix-daemon.cc
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@ -149,7 +149,7 @@ struct SavingSourceAdapter : Source
};
static void performOp(bool trusted, unsigned int clientVersion,
static void performOp(ref<LocalStore> store, bool trusted, unsigned int clientVersion,
Source & from, Sink & to, unsigned int op)
{
switch (op) {
@ -278,8 +278,7 @@ static void performOp(bool trusted, unsigned int clientVersion,
startWork();
if (!savedRegular.regular) throw Error("regular file expected");
Path path = dynamic_cast<LocalStore *>(store.get())
->addToStoreFromDump(recursive ? savedNAR.s : savedRegular.s, baseName, recursive, hashAlgo);
Path path = store->addToStoreFromDump(recursive ? savedNAR.s : savedRegular.s, baseName, recursive, hashAlgo);
stopWork();
to << path;
@ -583,56 +582,56 @@ static void processConnection(bool trusted)
#endif
/* Open the store. */
store = std::shared_ptr<StoreAPI>(new LocalStore(reserveSpace));
auto store = make_ref<LocalStore>(reserveSpace);
stopWork();
to.flush();
/* Process client requests. */
unsigned int opCount = 0;
while (true) {
WorkerOp op;
try {
op = (WorkerOp) readInt(from);
} catch (Interrupted & e) {
break;
} catch (EndOfFile & e) {
break;
}
opCount++;
try {
performOp(store, trusted, clientVersion, from, to, op);
} catch (Error & e) {
/* If we're not in a state where we can send replies, then
something went wrong processing the input of the
client. This can happen especially if I/O errors occur
during addTextToStore() / importPath(). If that
happens, just send the error message and exit. */
bool errorAllowed = canSendStderr;
stopWork(false, e.msg(), GET_PROTOCOL_MINOR(clientVersion) >= 8 ? e.status : 0);
if (!errorAllowed) throw;
} catch (std::bad_alloc & e) {
stopWork(false, "Nix daemon out of memory", GET_PROTOCOL_MINOR(clientVersion) >= 8 ? 1 : 0);
throw;
}
to.flush();
assert(!canSendStderr);
};
canSendStderr = false;
_isInterrupted = false;
printMsg(lvlDebug, format("%1% operations") % opCount);
} catch (Error & e) {
stopWork(false, e.msg(), GET_PROTOCOL_MINOR(clientVersion) >= 8 ? 1 : 0);
to.flush();
return;
}
/* Process client requests. */
unsigned int opCount = 0;
while (true) {
WorkerOp op;
try {
op = (WorkerOp) readInt(from);
} catch (Interrupted & e) {
break;
} catch (EndOfFile & e) {
break;
}
opCount++;
try {
performOp(trusted, clientVersion, from, to, op);
} catch (Error & e) {
/* If we're not in a state where we can send replies, then
something went wrong processing the input of the
client. This can happen especially if I/O errors occur
during addTextToStore() / importPath(). If that
happens, just send the error message and exit. */
bool errorAllowed = canSendStderr;
stopWork(false, e.msg(), GET_PROTOCOL_MINOR(clientVersion) >= 8 ? e.status : 0);
if (!errorAllowed) throw;
} catch (std::bad_alloc & e) {
stopWork(false, "Nix daemon out of memory", GET_PROTOCOL_MINOR(clientVersion) >= 8 ? 1 : 0);
throw;
}
to.flush();
assert(!canSendStderr);
};
canSendStderr = false;
_isInterrupted = false;
printMsg(lvlDebug, format("%1% operations") % opCount);
}
@ -787,10 +786,6 @@ static void daemonLoop(char * * argv)
while (1) {
try {
/* Important: the server process *cannot* open the SQLite
database, because it doesn't like forks very much. */
assert(!store);
/* Accept a connection. */
struct sockaddr_un remoteAddr;
socklen_t remoteAddrLen = sizeof(remoteAddr);