clostack: clojure cloudstack client

A simple clojure cloudstack client.

Reasoning

This client provides two ways to query the cloudstack HTTP API.

• A standard synchronous way, which still pools outgoing requests.
• A lower level access to the internal HTTP asynchronous client.

Configuring

Client are created with the http-client which takes an optional argument map:

• config: a map of three keys:
  • api-key: cloustack api key
  • api-secret: cloustack api secret
  • endpoint: URL where cloudstack lives
  • page-size: page size (by default 500)

The api-key, api-secret and endpoint may also be fetched from the environment or a configuration file.

The environment takes precedence over the configuration file. When looking for environment variables, both actual environment variables and JVM system properties will be looked up.

The following system properties or environment variables can be used to provide settings:

Property	Environment	Description
clostack.api.key	CLOSTACK_API_KEY	Cloudstack API key
clostack.api.secret	CLOSTACK_API_SECRET	Cloudstack API secret
clostack.endpoint	CLOSTACK_ENDPOINT	Cloudstack API endpoint

The configuration file allows for different profiles, two additional relevant variables may be set:

Property	Environment	Description
clostack.profile	CLOSTACK_PROFILE	Configuration profile name
clostack.config.file	CLOSTACK_CONFIG_FILE	Configuration file location

A typical configuration will have the following aspect:

{:default :prod
 :prod    {:api-key    "xxxx"
           :api-secret "xxxx"
           :endpoint   "https://..."}
 :staging {:api-key    "xxxx"
           :api-secret "xxxx"
           :endpoint   "https://..."}}

In this configuration, we define two cloudstack installations, by default the production credentials will be used, setting clostack.profile to staging would switch this mode of operation.

Using in your project

The easiest way to use clostack in your own projects is via Leiningen. Add the following dependency to your project.clj file:

[exoscale/clostack "0.2.17"]

Documentation

https://exoscale.github.io/clostack

Sample Code

(def client (http-client {}))

;; Simple requests
(request client :list-virtual-machines {})
(request client :list-zones {})

;; Provide a callback to execute when response comes back
(async-request client :list-service-offerings {} (fn [resp] ...))

;; Page through all records and return a consistent lazy map
(paging-request client :list-events {})

;; Execute body when response comes back
(with-response [resp client :list-events]
  (println (pr-str resp)))