I'm running the Testflight 3.9.0 release and using a headless server obtained via git. My setup was working flawlessly until a server crash wiped everything out. My libraries are on external drives so they were safe. I have two issues:

First:

1. Compiling headless server went fine.
2. Adding my library appears to work.
3. Library shows up via list-libraries

systemctl status yacreaderlibrary returns:

"Ubuntu 18.04.4 LTS" Version: "18.04"
"linux" "5.3.0-42-generic" Architecture: "x86_64"
" Libraries: QMap()

I can't connect to the library. It refuses connection via 3.9.0 and via a web browser.

I've tried various ports under [listener]. No difference with any.

Is this possibly a Qt compile issue? My config is:

./configure -release -qt-libpng -skip location -qt-xcb -qt-libpng -qt-zlib -qt-pcre -skip qtserialport -skip script -skip scxml -skip speech -skip wayland -skip purchasing -skip serialbus -skip quickcontrols -qt-zlib -static -release -prefix /home/jeff/Qt/5.12.0.static -fontconfig -confirm-license -opensource -no-opengl -qt-libjpeg -qt-xcb -no-dbus -nomake examples -nomake tests -skip declarative -qt-xkbcommon -skip webengine -qt-harfbuzz

Second:

Under Linux, create-library fails with a segfault every single time I use it. I build my libraries using a Mac, which seems to work w/o issues.

You could try restarting the server after adding the library and recheck if it really picked it up via systemctl status.

For the segfault, you should do a backtrace (using a debug build).

We don't build Qt ourselves and we use dynamic libraries as opposed to static, so I have no experience with Qt build options ...

selmf wrote:

YACReaderLibrary $ YACReaderLibraryServer list-libraries
comics1 : /media/jeff/comics1/comics


sudo systemctl restart yacreaderlibraryserver

sudo systemctl status yacreaderlibraryserver

jeff@linux YACReaderLibrary $ sudo systemctl status yacreaderlibraryserver
yacreaderlibraryserver.service - YACReaderLibrary headless server
Loaded: loaded (/usr/lib/systemd/user/yacreaderlibraryserver.service; enabled
Active: active (running) since Wed 2020-03-25 12:37:24 EDT; 10s ago
Main PID: 13693 (YACReaderLibrar)
Tasks: 1 (limit: 4915)
CGroup: /system.slice/yacreaderlibraryserver.service
└─13693 /usr/bin/YACReaderLibraryServer start

Mar 25 12:37:24 linux systemd[1]: Started YACReaderLibrary headless server.
Mar 25 12:37:24 linux YACReaderLibraryServer[13693]: INFO 2020-03-25T12:37:24.3
Mar 25 12:37:24 linux YACReaderLibraryServer[13693]: INFO 2020-03-25T12:37:24.3
Mar 25 12:37:24 linux YACReaderLibraryServer[13693]: INFO 2020-03-25T12:37:24.3
Mar 25 12:37:24 linux YACReaderLibraryServer[13693]: INFO 2020-03-25T12:37:24.3
Mar 25 12:37:24 linux YACReaderLibraryServer[13693]: INFO 2020-03-25T12:37:24.3
Mar 25 12:37:24 linux YACReaderLibraryServer[13693]: INFO 2020-03-25T12:37:24.3
Mar 25 12:37:24 linux YACReaderLibraryServer[13693]: INFO 2020-03-25T12:37:24.3

I don't see the library listed via systemctl status. This library loads w/o issues using OS/X.

This is just a hunch, but maybe you are missing the sqlite database plugin?

doc.qt.io/qt-5/sql-driver.html

I recompiled Qt, just in case and explicitly included the sqlite plugin, but no joy.

I did try running YACReaderLibraryServer w/o systemd and got the message below:

INFO 2020-03-25T17:44:10.963 YACReaderLibraryServer attempting to start
INFO 2020-03-25T17:44:10.964

---

System & configuration

---

INFO 2020-03-25T17:44:10.964 OS: "Ubuntu 18.04.4 LTS" Version: "18.04"
INFO 2020-03-25T17:44:10.964 Kernel: "linux" "5.3.0-42-generic" Architecture: "x86_64"
INFO 2020-03-25T17:44:10.965 Libraries: QMap(("comics1", QPair(1,"/media/jeff/comics1/comics")))
INFO 2020-03-25T17:44:10.965

---

INFO 2020-03-25T17:44:10.966 YACReaderLibrary starting
WARN 2020-03-25T17:44:10.973 QSqlDatabasePrivate::removeDatabase: connection '/media/jeff/comics1/comics/.yacreaderlibrary/library.ydb7fc3f1241780' is still in use, all queries will cease to work.

Are you sure? I definitely see improvement here. The library is listed at startup and I see indications it is working. Have you tested if it still segfaults if you try to create a new library?

There is probably still something missing in your Qt build. My next candidate would be the network module.
Run 'netstat -tulpn | grep YAC' (you might need to use root) to check if the binary is listening for incoming connections.

If everything else fails you can always look for a PPA with a more complete Qt build

root@linux:/home/jeff# netstat -tulpn | grep YAC
tcp6 0 0 :::9999 :::* LISTEN 2474/YACReaderLibra

Does connecting to localhost:9999 from a browser running on the same machine work now?

NFO 2020-03-25T21:47:29.014 YACReaderLibraryServer attempting to start
INFO 2020-03-25T21:47:29.014

---

System & configuration

---

INFO 2020-03-25T21:47:29.014 OS: "Ubuntu 18.04.4 LTS" Version: "18.04"
INFO 2020-03-25T21:47:29.014 Kernel: "linux" "5.3.0-42-generic" Architecture: "x86_64"
INFO 2020-03-25T21:47:29.014 Libraries: QMap(("comics", QPair(1,"/media/jeff/comics1/comics")))
INFO 2020-03-25T21:47:29.014

---

INFO 2020-03-25T21:47:29.014 YACReaderLibrary starting
WARN 2020-03-25T21:47:29.015 QSqlDatabasePrivate::removeDatabase: connection '/media/jeff/comics1/comics/.yacreaderlibrary/library.ydb7f0d9c4b9780' is still in use, all queries will cease to work.
ERROR 2020-03-25T21:47:29.016 Unable to create local server
+WARN 2020-03-25T21:48:10.288 QObject: Cannot create children for a parent that is in a different thread.
(Parent is RequestMapper(0x563d4f9bf3c0), parent's thread is QThread(0x563d4f9b8a50), current thread is HttpConnectionHandler(0x563d4fa00370)
ERROR 2020-03-25T21:48:10.289 TemplateCache: cannot find template libraries_ipad
WARN 2020-03-25T21:48:10.289 Template: missing loop {loop library} in libraries_ipad
WARN 2020-03-25T21:48:10.289 Template: missing variable {library0.name} in libraries_ipad
WARN 2020-03-25T21:48:10.289 Template: missing variable {library0.label} in libraries_ipad


Nope, can't connect via localhost. Just for chuckles I installed yacr using the directions from the page below. Same results.

software.opensuse.org/download.html?proj...mf&package=yacreader

I tried a few things on my machine today and I was able to partially reproduce the last log you posted. The template cache error is triggered when the server templates are not available. These are usually located at /usr/share/yacreader. Now we support two kinds of builds for YACReaderLibraryServer - server_bundled, which expects YACReaderLibrary to be installed so the templates are already present or server_standalone which adds the templates to the install. So for whatever reason, your build of YACReaderLibraryServer can't find the templates. We need to find out why.

Possible causes:

- your systemd unit is too restrictive
- you built a bundled server but did not install YACReader (should be fixed as you installed from OBS)
- you built a standalone server but did not install it
- something I can't think of right now

This still does not explain why the server isn't properly accepting connections. Have you tried running the binary outside of systemd?