Rather than composing them every time, we'll keep "ready-made" tuples
for unknown entries and internal errors (which is, yet, unused)

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Add the following functions to SimpleConfigReader:
GetInstanceByIp, nic ip -> instance name
GetNodePrimaryIp, node name -> node primary ip
GetInstancePrimaryNode, instance name -> primary node

For the first one we precalculate the _ip_to_instance, so we don't have
to loop over all instances for each query.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

This implements CONFD_REQ_NODE_ROLE_BYNAME.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Adding a way to retrieve the three node status flags, all in one go,
from SimpleConfigReader. Non-existing nodes are handled by returning
"None".

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

If we standardize common error codes, clients can make use of them to
react, rather than trying to parse error strings.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Apart from being a master, a candidate, offline or drained, a node can
have one more state: none of those. Adding back the normal, nice,
healthy "just" a node! :)

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

During a query execution we currently verify whether we have that query
supported in our dispatch table. Since it's an error not to have it
anyway, we move this verification to the class creation, erroring out
early if such a problem exists.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

We'll start with a simple ping query, which returns ok if it gets no
query argument, and an error if it gets any. Also non-implemented query
are handled by the base ConfdQuery class, so we don't have to
special-case them in ConfdProcessor anymore.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

The message is an error deriving from some code moving/refactoring
happening before the initial submission

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

confd.server and daemons/ganeti-confd import a few modules they don't
actually use. Clean them up.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Rewrite the part which discusses the global list of files to be distributed
updating with the description of what is going to be implemented. Just read
below..

Signed-off-by: Luca Bigliardi <shammash@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

This fixes ganeti-rapi which was broken in commit 7a95a954.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

Use variables already defined.
Introduce ganeti CONF_DIR.

Signed-off-by: Luca Bigliardi <shammash@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Use " " instead of ",".

Signed-off-by: Luca Bigliardi <shammash@google.com>

Map the node hostname with its primary/secondary ganeti IP in ssconf.
In this way a node can discover which are its IPs simply grepping ssconf files,
thus avoiding checks depending on network configuration.

Signed-off-by: Luca Bigliardi <shammash@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

Adding ganeti-confd to the example init script. The daemon itself will
only start on master candidates, but the init script can just try to
start it on all nodes.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

ganeti-confd is a simple asynchronous daemon, which listens on a UDP
port, passes each packet to a processor, and sends back to the client
the result.

It also listens on an inotify socket, in order to reload its
configuration when the ganeti config file changes.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

A ConfdProcessor is the job processor for a confd query.
It's responsible for all the processing, from unpacking it, verifying
it, to calculating the result.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

It will be used for the confd server code, and for a basic client
library.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Adding the various basic daemon constants for confd.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

These are valid values for the "status" field in objects.ConfdReply

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

If for some reason we try to call Reload twice but the config file
hasn't changed, we don't want to load it again. Use stat() on the file
to cheaply avoid that situation.

We also return a boolean value, according to whether we have reloaded
the config or not.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Since we use it also to load the config file initially we rename the
Reload function to _Load. Then we re-export it as Reload to clients
(since for them it's a reload).

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Call PostInitCluster from 'gnt-cluster init'.

Signed-off-by: Luca Bigliardi <shammash@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Add an 'empty' logical unit to run hooks after cluster initialization.

Signed-off-by: Luca Bigliardi <shammash@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

This is the terminology used by libvirt, it's shorter, clearer, and it
makes sense. :)

Also the final sentence about "possible futures" is changed to be a bit
more clear.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

GetConfigSerialNo and GetClusterSerialNo return respectively the serial
number for the config and for the cluster object.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Don't indent the final message.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

confd will return the node role as an integer, which represents one of
the mutually exclusive roles a node can be in.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Initially confd will support only two queries:

CONFD_REQ_NODE_ROLE_BYNAME
Given a node name, return its role.

CONFD_REQ_NODE_PIP_BY_INSTANCE_IP
Given an instance ip, return its node primary ip.
This rather weird query is the basis for ganeti nbma lookup.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Until now it was being kept too vague, so here we give some real
examples of how things are going to be.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Rather than initializing the config statically at class creation time,
we load it every time Reload() is called.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

These objects are used to store confd queries and replies.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

The salt needs to be returned anyway, so we don't have to add another
key for the sender to recognize which request an answer is answering, so
all that infrastructure is useless. :(

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

After 74d519e3b91845a17ae095eb7d58dd9e3d1303e8 Ganeti depends on
pyinotify. Updating the documentation accordingly and checking for its
presence at configure time.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

AsyncNotifier is a special asyncore class that delivers inotify events
asynchronously.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>