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recoll/src/index/rclmonrcv.cpp
Jean-Francois Dockes dfcd57f665 log messages
2016-07-12 13:04:32 +02:00

739 lines
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#include "autoconfig.h"
#ifdef RCL_MONITOR
/* Copyright (C) 2006 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "autoconfig.h"
#include <errno.h>
#include <cstdio>
#include <cstring>
#include "safesysstat.h"
#include "safeunistd.h"
#include "log.h"
#include "rclmon.h"
#include "rclinit.h"
#include "fstreewalk.h"
#include "pathut.h"
/**
* Recoll real time monitor event receiver. This file has code to interface
* to FAM or inotify and place events on the event queue.
*/
/** A small virtual interface for monitors. Lets
* either fam/gamin or raw imonitor hide behind
*/
class RclMonitor {
public:
RclMonitor()
: saved_errno(0)
{
}
virtual ~RclMonitor()
{
}
virtual bool addWatch(const string& path, bool isDir) = 0;
virtual bool getEvent(RclMonEvent& ev, int msecs = -1) = 0;
virtual bool ok() const = 0;
// Does this monitor generate 'exist' events at startup?
virtual bool generatesExist() const = 0;
// Save significant errno after monitor calls
int saved_errno;
};
// Monitor factory. We only have one compiled-in kind at a time, no
// need for a 'kind' parameter
static RclMonitor *makeMonitor();
/**
* Create directory watches during the initial file system tree walk.
*
* This class is a callback for the file system tree walker
* class. The callback method alternatively creates the directory
* watches and flushes the event queue (to avoid a possible overflow
* while we create the watches)
*/
class WalkCB : public FsTreeWalkerCB {
public:
WalkCB(RclConfig *conf, RclMonitor *mon, RclMonEventQueue *queue,
FsTreeWalker& walker)
: m_config(conf), m_mon(mon), m_queue(queue), m_walker(walker)
{}
virtual ~WalkCB()
{}
virtual FsTreeWalker::Status
processone(const string &fn, const struct stat *st,
FsTreeWalker::CbFlag flg)
{
MONDEB(("rclMonRcvRun: processone %s m_mon %p m_mon->ok %d\n",
fn.c_str(), m_mon, m_mon?m_mon->ok():0));
if (flg == FsTreeWalker::FtwDirEnter ||
flg == FsTreeWalker::FtwDirReturn) {
m_config->setKeyDir(fn);
// Set up skipped patterns for this subtree.
m_walker.setSkippedNames(m_config->getSkippedNames());
}
if (flg == FsTreeWalker::FtwDirEnter) {
// Create watch when entering directory, but first empty
// whatever events we may already have on queue
while (m_queue->ok() && m_mon->ok()) {
RclMonEvent ev;
if (m_mon->getEvent(ev, 0)) {
if (ev.m_etyp != RclMonEvent::RCLEVT_NONE)
m_queue->pushEvent(ev);
} else {
MONDEB("rclMonRcvRun: no event pending\n");
break;
}
}
if (!m_mon || !m_mon->ok())
return FsTreeWalker::FtwError;
// We do nothing special if addWatch fails for a reasonable reason
if (!m_mon->addWatch(fn, true)) {
if (m_mon->saved_errno != EACCES &&
m_mon->saved_errno != ENOENT)
return FsTreeWalker::FtwError;
}
} else if (!m_mon->generatesExist() &&
flg == FsTreeWalker::FtwRegular) {
// Have to synthetize events for regular files existence
// at startup because the monitor does not do it
// Note 2011-09-29: no sure this is actually needed. We just ran
// an incremental indexing pass (before starting the
// monitor). Why go over the files once more ? The only
// reason I can see would be to catch modifications that
// happen between the incremental and the start of
// monitoring ? There should be another way: maybe start
// monitoring without actually handling events (just
// queue), then run incremental then start handling
// events ? But we also have to do it on a directory
// move! So keep it
RclMonEvent ev;
ev.m_path = fn;
ev.m_etyp = RclMonEvent::RCLEVT_MODIFY;
m_queue->pushEvent(ev);
}
return FsTreeWalker::FtwOk;
}
private:
RclConfig *m_config;
RclMonitor *m_mon;
RclMonEventQueue *m_queue;
FsTreeWalker& m_walker;
};
/** Main thread routine: create watches, then forever wait for and queue events */
void *rclMonRcvRun(void *q)
{
RclMonEventQueue *queue = (RclMonEventQueue *)q;
LOGDEB("rclMonRcvRun: running\n" );
recoll_threadinit();
// Make a local copy of the configuration as it doesn't like
// concurrent accesses. It's ok to copy it here as the other
// thread will not work before we have sent events.
RclConfig lconfig(*queue->getConfig());
// Create the fam/whatever interface object
RclMonitor *mon;
if ((mon = makeMonitor()) == 0) {
LOGERR("rclMonRcvRun: makeMonitor failed\n" );
queue->setTerminate();
return 0;
}
// Get top directories from config
vector<string> tdl = lconfig.getTopdirs();
if (tdl.empty()) {
LOGERR("rclMonRcvRun:: top directory list (topdirs param.) notfound in config or Directory list parse error" );
queue->setTerminate();
return 0;
}
// Walk the directory trees to add watches
FsTreeWalker walker;
walker.setSkippedPaths(lconfig.getDaemSkippedPaths());
WalkCB walkcb(&lconfig, mon, queue, walker);
for (vector<string>::iterator it = tdl.begin(); it != tdl.end(); it++) {
lconfig.setKeyDir(*it);
// Adjust the follow symlinks options
bool follow;
if (lconfig.getConfParam("followLinks", &follow) &&
follow) {
walker.setOpts(FsTreeWalker::FtwFollow);
} else {
walker.setOpts(FsTreeWalker::FtwOptNone);
}
LOGDEB("rclMonRcvRun: walking " << *it << "\n" );
if (walker.walk(*it, walkcb) != FsTreeWalker::FtwOk) {
LOGERR("rclMonRcvRun: tree walk failed\n" );
goto terminate;
}
if (walker.getErrCnt() > 0) {
LOGINFO("rclMonRcvRun: fs walker errors: " << (walker.getReason()) << "\n" );
}
}
{
bool doweb = false;
lconfig.getConfParam("processwebqueue", &doweb);
if (doweb) {
string webqueuedir = lconfig.getWebQueueDir();
if (!mon->addWatch(webqueuedir, true)) {
LOGERR("rclMonRcvRun: addwatch (webqueuedir) failed\n" );
if (mon->saved_errno != EACCES && mon->saved_errno != ENOENT)
goto terminate;
}
}
}
// Forever wait for monitoring events and add them to queue:
MONDEB("rclMonRcvRun: waiting for events. q->ok(): " << queue->ok() <<
std::endl);
while (queue->ok() && mon->ok()) {
RclMonEvent ev;
// Note: I could find no way to get the select
// call to return when a signal is delivered to the process
// (it goes to the main thread, from which I tried to close or
// write to the select fd, with no effect). So set a
// timeout so that an intr will be detected
if (mon->getEvent(ev, 2000)) {
// Don't push events for skipped files. This would get
// filtered on the processing side anyway, but causes
// unnecessary wakeups and messages. Do not test
// skippedPaths here, this would be incorrect (because a
// topdir can be under a skippedPath and this was handled
// while adding the watches).
lconfig.setKeyDir(path_getfather(ev.m_path));
walker.setSkippedNames(lconfig.getSkippedNames());
if (walker.inSkippedNames(path_getsimple(ev.m_path)))
continue;
if (ev.m_etyp == RclMonEvent::RCLEVT_DIRCREATE) {
// Recursive addwatch: there may already be stuff
// inside this directory. Ie: files were quickly
// created, or this is actually the target of a
// directory move. This is necessary for inotify, but
// it seems that fam/gamin is doing the job for us so
// that we are generating double events here (no big
// deal as prc will sort/merge).
LOGDEB("rclMonRcvRun: walking new dir " << (ev.m_path) << "\n" );
if (walker.walk(ev.m_path, walkcb) != FsTreeWalker::FtwOk) {
LOGERR("rclMonRcvRun: walking new dir " << (ev.m_path) << ": " << (walker.getReason()) << "\n" );
goto terminate;
}
if (walker.getErrCnt() > 0) {
LOGINFO("rclMonRcvRun: fs walker errors: " << (walker.getReason()) << "\n" );
}
}
if (ev.m_etyp != RclMonEvent::RCLEVT_NONE)
queue->pushEvent(ev);
}
}
terminate:
queue->setTerminate();
LOGINFO("rclMonRcvRun: monrcv thread routine returning\n" );
return 0;
}
// Utility routine used by both the fam/gamin and inotify versions to get
// rid of the id-path translation for a moved dir
bool eraseWatchSubTree(map<int, string>& idtopath, const string& top)
{
bool found = false;
MONDEB("Clearing map for [" << top << "]\n");
map<int,string>::iterator it = idtopath.begin();
while (it != idtopath.end()) {
if (it->second.find(top) == 0) {
found = true;
idtopath.erase(it++);
} else {
it++;
}
}
return found;
}
// We dont compile both the inotify and the fam interface and inotify
// has preference
#ifndef RCL_USE_INOTIFY
#ifdef RCL_USE_FAM
//////////////////////////////////////////////////////////////////////////
/** Fam/gamin -based monitor class */
#include <fam.h>
#include <sys/select.h>
#include <setjmp.h>
#include <signal.h>
/** FAM based monitor class. We have to keep a record of FAM watch
request numbers to directory names as the event only contain the
request number and file name, not the full path */
class RclFAM : public RclMonitor {
public:
RclFAM();
virtual ~RclFAM();
virtual bool addWatch(const string& path, bool isdir);
virtual bool getEvent(RclMonEvent& ev, int msecs = -1);
bool ok() const {return m_ok;}
virtual bool generatesExist() const {return true;}
private:
bool m_ok;
FAMConnection m_conn;
void close() {
FAMClose(&m_conn);
m_ok = false;
}
map<int,string> m_idtopath;
const char *event_name(int code);
};
// Translate event code to string (debug)
const char *RclFAM::event_name(int code)
{
static const char *famevent[] = {
"",
"FAMChanged",
"FAMDeleted",
"FAMStartExecuting",
"FAMStopExecuting",
"FAMCreated",
"FAMMoved",
"FAMAcknowledge",
"FAMExists",
"FAMEndExist"
};
static char unknown_event[30];
if (code < FAMChanged || code > FAMEndExist) {
sprintf(unknown_event, "unknown (%d)", code);
return unknown_event;
}
return famevent[code];
}
RclFAM::RclFAM()
: m_ok(false)
{
if (FAMOpen2(&m_conn, "Recoll")) {
LOGERR("RclFAM::RclFAM: FAMOpen2 failed, errno " << (errno) << "\n" );
return;
}
m_ok = true;
}
RclFAM::~RclFAM()
{
if (ok())
FAMClose(&m_conn);
}
static jmp_buf jbuf;
static void onalrm(int sig)
{
longjmp(jbuf, 1);
}
bool RclFAM::addWatch(const string& path, bool isdir)
{
if (!ok())
return false;
bool ret = false;
MONDEB("RclFAM::addWatch: adding " << path << std::endl);
// It happens that the following call block forever.
// We'd like to be able to at least terminate on a signal here, but
// gamin forever retries its write call on EINTR, so it's not even useful
// to unblock signals. SIGALRM is not used by the main thread, so at least
// ensure that we exit after gamin gets stuck.
if (setjmp(jbuf)) {
LOGERR("RclFAM::addWatch: timeout talking to FAM\n" );
return false;
}
signal(SIGALRM, onalrm);
alarm(20);
FAMRequest req;
if (isdir) {
if (FAMMonitorDirectory(&m_conn, path.c_str(), &req, 0) != 0) {
LOGERR("RclFAM::addWatch: FAMMonitorDirectory failed\n" );
goto out;
}
} else {
if (FAMMonitorFile(&m_conn, path.c_str(), &req, 0) != 0) {
LOGERR("RclFAM::addWatch: FAMMonitorFile failed\n" );
goto out;
}
}
m_idtopath[req.reqnum] = path;
ret = true;
out:
alarm(0);
return ret;
}
// Note: return false only for queue empty or error
// Return EVT_NONE for bad event to keep queue processing going
bool RclFAM::getEvent(RclMonEvent& ev, int msecs)
{
if (!ok())
return false;
MONDEB("RclFAM::getEvent:\n");
fd_set readfds;
int fam_fd = FAMCONNECTION_GETFD(&m_conn);
FD_ZERO(&readfds);
FD_SET(fam_fd, &readfds);
MONDEB("RclFAM::getEvent: select. fam_fd is " << fam_fd << std::endl);
// Fam / gamin is sometimes a bit slow to send events. Always add
// a little timeout, because if we fail to retrieve enough events,
// we risk deadlocking in addwatch()
if (msecs == 0)
msecs = 2;
struct timeval timeout;
if (msecs >= 0) {
timeout.tv_sec = msecs / 1000;
timeout.tv_usec = (msecs % 1000) * 1000;
}
int ret;
if ((ret=select(fam_fd+1, &readfds, 0, 0, msecs >= 0 ? &timeout : 0)) < 0) {
LOGERR("RclFAM::getEvent: select failed, errno " << (errno) << "\n" );
close();
return false;
} else if (ret == 0) {
// timeout
MONDEB("RclFAM::getEvent: select timeout\n");
return false;
}
MONDEB("RclFAM::getEvent: select returned " << ret << std::endl);
if (!FD_ISSET(fam_fd, &readfds))
return false;
// ?? 2011/03/15 gamin v0.1.10. There is initially a single null
// byte on the connection so the first select always succeeds. If
// we then call FAMNextEvent we stall. Using FAMPending works
// around the issue, but we did not need this in the past and this
// is most weird.
if (FAMPending(&m_conn) <= 0) {
MONDEB("RclFAM::getEvent: FAMPending says no events\n");
return false;
}
MONDEB("RclFAM::getEvent: call FAMNextEvent\n");
FAMEvent fe;
if (FAMNextEvent(&m_conn, &fe) < 0) {
LOGERR("RclFAM::getEvent: FAMNextEvent failed, errno " << (errno) << "\n" );
close();
return false;
}
MONDEB("RclFAM::getEvent: FAMNextEvent returned\n");
map<int,string>::const_iterator it;
if ((!path_isabsolute(fe.filename)) &&
(it = m_idtopath.find(fe.fr.reqnum)) != m_idtopath.end()) {
ev.m_path = path_cat(it->second, fe.filename);
} else {
ev.m_path = fe.filename;
}
MONDEB("RclFAM::getEvent: " << event_name(fe.code) < " " <<
ev.m_path << std::endl);
switch (fe.code) {
case FAMCreated:
if (path_isdir(ev.m_path)) {
ev.m_etyp = RclMonEvent::RCLEVT_DIRCREATE;
break;
}
/* FALLTHROUGH */
case FAMChanged:
case FAMExists:
// Let the other side sort out the status of this file vs the db
ev.m_etyp = RclMonEvent::RCLEVT_MODIFY;
break;
case FAMMoved:
case FAMDeleted:
ev.m_etyp = RclMonEvent::RCLEVT_DELETE;
// We would like to signal a directory here to enable cleaning
// the subtree (on a dir move), but can't test the actual file
// which is gone, and fam doesn't tell us if it's a dir or reg.
// Let's rely on the fact that a directory should be watched
if (eraseWatchSubTree(m_idtopath, ev.m_path))
ev.m_etyp |= RclMonEvent::RCLEVT_ISDIR;
break;
case FAMStartExecuting:
case FAMStopExecuting:
case FAMAcknowledge:
case FAMEndExist:
default:
// Have to return something, this is different from an empty queue,
// esp if we are trying to empty it...
if (fe.code != FAMEndExist)
LOGDEB("RclFAM::getEvent: got other event " << (fe.code) << "!\n" );
ev.m_etyp = RclMonEvent::RCLEVT_NONE;
break;
}
return true;
}
#endif // RCL_USE_FAM
#endif // ! INOTIFY
#ifdef RCL_USE_INOTIFY
//////////////////////////////////////////////////////////////////////////
/** Inotify-based monitor class */
#include <sys/inotify.h>
#include <sys/select.h>
class RclIntf : public RclMonitor {
public:
RclIntf()
: m_ok(false), m_fd(-1), m_evp(0), m_ep(0)
{
if ((m_fd = inotify_init()) < 0) {
LOGERR("RclIntf:: inotify_init failed, errno " << (errno) << "\n" );
return;
}
m_ok = true;
}
virtual ~RclIntf()
{
close();
}
virtual bool addWatch(const string& path, bool isdir);
virtual bool getEvent(RclMonEvent& ev, int msecs = -1);
bool ok() const {return m_ok;}
virtual bool generatesExist() const {return false;}
private:
bool m_ok;
int m_fd;
map<int,string> m_idtopath; // Watch descriptor to name
#define EVBUFSIZE (32*1024)
char m_evbuf[EVBUFSIZE]; // Event buffer
char *m_evp; // Pointer to next event or 0
char *m_ep; // Pointer to end of events
const char *event_name(int code);
void close() {
if (m_fd >= 0) {
::close(m_fd);
m_fd = -1;
}
m_ok = false;
}
};
const char *RclIntf::event_name(int code)
{
code &= ~(IN_ISDIR|IN_ONESHOT);
switch (code) {
case IN_ACCESS: return "IN_ACCESS";
case IN_MODIFY: return "IN_MODIFY";
case IN_ATTRIB: return "IN_ATTRIB";
case IN_CLOSE_WRITE: return "IN_CLOSE_WRITE";
case IN_CLOSE_NOWRITE: return "IN_CLOSE_NOWRITE";
case IN_CLOSE: return "IN_CLOSE";
case IN_OPEN: return "IN_OPEN";
case IN_MOVED_FROM: return "IN_MOVED_FROM";
case IN_MOVED_TO: return "IN_MOVED_TO";
case IN_MOVE: return "IN_MOVE";
case IN_CREATE: return "IN_CREATE";
case IN_DELETE: return "IN_DELETE";
case IN_DELETE_SELF: return "IN_DELETE_SELF";
case IN_MOVE_SELF: return "IN_MOVE_SELF";
case IN_UNMOUNT: return "IN_UNMOUNT";
case IN_Q_OVERFLOW: return "IN_Q_OVERFLOW";
case IN_IGNORED: return "IN_IGNORED";
default: {
static char msg[50];
sprintf(msg, "Unknown event 0x%x", code);
return msg;
}
};
}
bool RclIntf::addWatch(const string& path, bool)
{
if (!ok())
return false;
MONDEB("RclIntf::addWatch: adding " << path << std::endl);
// CLOSE_WRITE is covered through MODIFY. CREATE is needed for mkdirs
uint32_t mask = IN_MODIFY | IN_CREATE
| IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE
// IN_ATTRIB used to be not needed to receive extattr
// modification events, which was a bit weird because only ctime is
// set, and now it is...
| IN_ATTRIB
#ifdef IN_DONT_FOLLOW
| IN_DONT_FOLLOW
#endif
#ifdef IN_EXCL_UNLINK
| IN_EXCL_UNLINK
#endif
;
int wd;
if ((wd = inotify_add_watch(m_fd, path.c_str(), mask)) < 0) {
saved_errno = errno;
LOGERR("RclIntf::addWatch: inotify_add_watch failed. errno " << (saved_errno) << "\n" );
if (errno == ENOSPC) {
LOGERR("RclIntf::addWatch: ENOSPC error may mean that you needincrease the inotify kernel constants. See inotify(7)\n" );
}
return false;
}
m_idtopath[wd] = path;
return true;
}
// Note: return false only for queue empty or error
// Return EVT_NONE for bad event to keep queue processing going
bool RclIntf::getEvent(RclMonEvent& ev, int msecs)
{
if (!ok())
return false;
ev.m_etyp = RclMonEvent::RCLEVT_NONE;
MONDEB("RclIntf::getEvent:\n");
if (m_evp == 0) {
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(m_fd, &readfds);
struct timeval timeout;
if (msecs >= 0) {
timeout.tv_sec = msecs / 1000;
timeout.tv_usec = (msecs % 1000) * 1000;
}
int ret;
MONDEB("RclIntf::getEvent: select\n");
if ((ret=select(m_fd + 1, &readfds, 0, 0, msecs >= 0 ? &timeout : 0)) < 0) {
LOGERR("RclIntf::getEvent: select failed, errno " << (errno) << "\n" );
close();
return false;
} else if (ret == 0) {
MONDEB("RclIntf::getEvent: select timeout\n");
// timeout
return false;
}
MONDEB("RclIntf::getEvent: select returned\n");
if (!FD_ISSET(m_fd, &readfds))
return false;
int rret;
if ((rret=read(m_fd, m_evbuf, sizeof(m_evbuf))) <= 0) {
LOGERR("RclIntf::getEvent: read failed, " << sizeof(m_evbuf) <<
"->" << rret << " errno " << errno << "\n");
close();
return false;
}
m_evp = m_evbuf;
m_ep = m_evbuf + rret;
}
struct inotify_event *evp = (struct inotify_event *)m_evp;
m_evp += sizeof(struct inotify_event);
if (evp->len > 0)
m_evp += evp->len;
if (m_evp >= m_ep)
m_evp = m_ep = 0;
map<int,string>::const_iterator it;
if ((it = m_idtopath.find(evp->wd)) == m_idtopath.end()) {
LOGERR("RclIntf::getEvent: unknown wd " << (evp->wd) << "\n" );
return true;
}
ev.m_path = it->second;
if (evp->len > 0) {
ev.m_path = path_cat(ev.m_path, evp->name);
}
MONDEB("RclIntf::getEvent: " << event_name(evp->mask) << " " <<
ev.m_path << std::endl);
if ((evp->mask & IN_MOVED_FROM) && (evp->mask & IN_ISDIR)) {
// We get this when a directory is renamed. Erase the subtree
// entries in the map. The subsequent MOVED_TO will recreate
// them. This is probably not needed because the watches
// actually still exist in the kernel, so that the wds
// returned by future addwatches will be the old ones, and the
// map will be updated in place. But still, this feels safer
eraseWatchSubTree(m_idtopath, ev.m_path);
}
// IN_ATTRIB used to be not needed, but now it is
if (evp->mask & (IN_MODIFY|IN_ATTRIB)) {
ev.m_etyp = RclMonEvent::RCLEVT_MODIFY;
} else if (evp->mask & (IN_DELETE | IN_MOVED_FROM)) {
ev.m_etyp = RclMonEvent::RCLEVT_DELETE;
if (evp->mask & IN_ISDIR)
ev.m_etyp |= RclMonEvent::RCLEVT_ISDIR;
} else if (evp->mask & (IN_CREATE | IN_MOVED_TO)) {
if (evp->mask & IN_ISDIR) {
ev.m_etyp = RclMonEvent::RCLEVT_DIRCREATE;
} else {
// We used to return null event because we would get a
// modify event later, but it seems not to be the case any
// more (10-2011). So generate MODIFY event
ev.m_etyp = RclMonEvent::RCLEVT_MODIFY;
}
} else if (evp->mask & (IN_IGNORED)) {
if (!m_idtopath.erase(evp->wd)) {
LOGDEB0("Got IGNORE event for unknown watch\n" );
} else {
eraseWatchSubTree(m_idtopath, ev.m_path);
}
} else {
LOGDEB("RclIntf::getEvent: unhandled event " << (event_name(evp->mask)) << " 0x" << (evp->mask) << " " << (ev.m_path) << "\n" );
return true;
}
return true;
}
#endif // RCL_USE_INOTIFY
///////////////////////////////////////////////////////////////////////
// The monitor 'factory'
static RclMonitor *makeMonitor()
{
#ifdef RCL_USE_INOTIFY
return new RclIntf;
#endif
#ifndef RCL_USE_INOTIFY
#ifdef RCL_USE_FAM
return new RclFAM;
#endif
#endif
LOGINFO("RclMonitor: neither Inotify nor Fam was compiled as file system change notification interface\n" );
return 0;
}
#endif // RCL_MONITOR
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