A Node.js driver for oVirt REST API
This is a very early alpha that supports only crawling, searching and action
OK. Here are the Node.js to oVirt driver specs.
- We need one entry point object that represents an oVirt instance.
- We want to specify "connection" parameters to that object in constructor.
- Once this object is constructed we want to retrieve an API root resource
object (via the lazy getter).
- Such call produces a special object - an API root resource.
- Once API root object initialized we could get oVirt main properties
withing dedicated method (getProperties).
- Also we could access oVirt main properties directly as API root object
own properties (via getters?).
- Also there is .getPropertyKeys() method that return property keys.
- All top-level oVirt collection are lazy-accessible as a hash of properties
- Collection getter lazy-loads oVirt collection with corresponding API call.
- Each collection is an instance of oVirt collection class.
- Every collection instance knows it's owner resource.
- For the main collection an owner resource is an API root itself.
- Collections could give access to their resources by the resource ID.
- Also collections could list their whole content.
But this operation could produce a large incoming traffic.
- Resource requests are allways lazy.
- Some collections could be searched for contained resources by their
top-level parameters and some are not.
- Collections could be requested to create blank resource object.
- Retrieved resource should behave as an API root except it has a link to
- Resources could be retrieved, created, updated and deleted.
- Resources doesn't care whether their subresources are changed.
- Every time when resource top-level parameters changed the resource
comes to "unsaved" state.
- Blank resources are always unsaved and also marked as "new".
- Resources could have an actions.
- Actions are methods that causes API calls which could change the
- Complete action list could be retrieved withing dedicated method
.getActions() (which is a getter for .actions property).
API node level
- Collections and resources (both regular and the root one) are considered
as API nodes.
- API nodes doesn't call API during construction but could be refreshed.
- Regular refresh doesn't affect child nodes.
- Deep refresh implementation could be considered in future releases.
- Every node knows it's base URI (an URI of the parent node).
- Every node knows how to represent itself as an API URI element.
- So, a node knows it's own dedicated API URI.
- Every node passes it's dedicated URI to the children as their base URI
during their construction.
- We do not consider base URI recalculation in current release.
- Some API nodes properties (both in collections and resources) could be
a links to other resources. And that means that we probably should
instantiate their collections (and maybe the owning resources of their
collections and so on) once we retrieve them.
- To perform API call a node requests oVirt connection to create an API
request object, configurates it and executes.
- Has a link to connection to retrieve it's parameters.
- Accepts API node and an action or operation to perform.
- Determines request method which depend on requested operation.
- Maps target node to XML if required.
- Generates authentication header.
- Could perform an HTTP(s) request.
- Retrieves the server response, hidrates (currently uses only xml2js) it
and then passes to target node.
Copyright (C) 2013 Mikhail Zyatin
with contributions by several individuals:
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