By moving the repurposing of the servers under the global server lock, the
repurposing of a server and allocation of a new server behave in the same
way.
Also fixed the wrong error message on server creation failure referring to
invalid server relationships.
The monitors should only be reused if they have the same name and they use
the same module. This way the only difference is in configuration.
Fixed MaxCtrl detection of bad options and altered monitor creation test
to expect correct results. Also improved some of the error messages.
If a destroyed monitor is created again, it will be reused. This should
prevent excessive memory growth when the same monitor is created and
destroyed again.
All of the alter operations weren't properly validating the integer
parameters. This appeared to the client as successful modifications of
parameters with bad value.
When a PATCH request to a resource is made with no relationships defined,
it should be interpreted to be the same as the old relationships. Removal
of relationships can still be done by defining an empty relationships
object.
The link/unlink commands are similar to the add/remove commands in
MaxAdmin but they link services and monitors to a list of servers instead
of linking servers to a list of either services or monitors. This can
reduce the number of required calls to alter the configuration while
making the process easier for MaxCtrl to do via the REST API.
Also fixed a false negative where a service alteration which results in a
no-op would be counted as an error.
The /maxscale/ resource now supports PUT requests which modify core
parameters. As not all parameters can be changed at runtime, only
modifications to parameters that support runtime configuration are
allowed.
A set of the core MaxScale parameters can now be altered at runtime. This
set consists of the authentication timeouts and the admin interface
authentication. Other parameters either can't be modified due to internal
limitations or aren't sensible to modify at runtime.
The runtime error buffer is now a thread-local buffer. This fixes the
build failure on older systems where the compiler doesn't allow
thread-local non-POD objects to be created.
Also expanded some of the JSON validation functions so that they provide
better errors.
The requests that send a body should define at least a `data` member.
Added a simple test that checks that bad requests are rejected. This test
should be expanded to check that the returned error body contains the
correct members.
The creation and modification of moitor now supports the JSON API
conforming format generated by the GET endpoints.
Also added tests for creating and altering monitors via the REST API.
When a monitor is created, any parameters given to it are immediately
processed. This is done by processing the initial request as if it were an
update to the monitor that was just created.
Changed the order in which servers are linked to objects. The old
relations are removed first and only after that are the new relations
added. This fixed a problem when the monitor which monitors a server was
being changed.
Also fixed a few minor bugs.
Destroyed servers were still shown as a part of the servers resource
collection.
If a parameter defined in persisted configurations was replaced, the value
would be appended to itself after it was replaced.
Return correct error codes for internal errors.
The server check was checking for old parameter locations.
Service parameters can now be altered with a PUT request to the REST
API. This allows general level parameters to be altered.
Module specific parameters need to be altered with a different mechanism,
namely the module command system. This requires that a generic way to call
a function needs to be devised.
When a persisted configuration file is read, the values in it are
considered to be more up-to-date than the ones in the main configuration
file. This allows all objects to be persisted in a more complete form
making it easier to change configuration values at runtime.
This change is intended to help make runtime alterations to services
possible.
Monitor resources can now be altered with a PUT request. The method allows
alterations on all parameters that the maxadmin `alter monitor` command
allows.
The alteration function is only called when the value of a parameter
changes. This removes some of the redundant logging that was caused by
calling the alteration function with the same values.
The server can now be modified with a PUT request of a modified server
resource. The server resource was reorganized to have the parameters as a
separate entity from the other more general entities of the resource.
The PUT/POST functions return a more appropriate error message when no
request body is provided.
Moved some of the constant names used in server.cc into the config.h
header.
Now all relevant and working core configuration parameters have constants
for their names. This removes some of the risk that comes with the
repetition of the same parameter name in more than place.
The parameter names for monitors and servers now use a set of constant
names. This removes some of the errors caused by spelling mistakes when
the same parameter name is repeated in multiple places.
The service, filter and listener parameters should also be converted to
constants. This allows for a consistent user experience.
This number (defaults to 1) sets how many times mon_connect_to_db
will try to connect to a backend before returning an error. Every
connection attempt may take backend_connect_timeout seconds to
complete.
Also refactored code a bit. Renamed mon_connect_to_db to
mon_ping_or_connect_to_db, since it does not connect if the connection
is already alive.
