mirror of https://github.com/apache/jclouds.git
First cut at a clojure wrapper of EBS interface
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Chas Emerick
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(ns org.jclouds.aws.ebs
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"A clojure binding to the jclouds EBS service interface."
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(:require (org.jclouds [compute :as compute])
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(clojure.contrib [logging :as log]))
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(:use (clojure.contrib def core))
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(:import org.jclouds.aws.domain.Region
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org.jclouds.aws.ec2.domain.AvailabilityZone
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(org.jclouds.aws.ec2.options DescribeSnapshotsOptions DetachVolumeOptions)))
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(defn #^org.jclouds.aws.ec2.services.ElasticBlockStoreClient
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ebs-services
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"Returns the synchronous ElasticBlockStoreClient associated with
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the specified compute service, or compute/*compute* as bound by with-compute-service."
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[& [compute]]
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(-> (or compute compute/*compute*)
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.getContext .getProviderSpecificContext .getApi .getElasticBlockStoreServices))
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(defn as-region
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"Returns the first argument as the corresponding Region if it is a
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keyword or already a Region instance. An optional second argument
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is returned if the first cannot be coerced into a Region.
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Returns nil otherwise."
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[v & [default-region]]
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(cond
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(keyword? v) (Region/fromValue (name v))
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(instance? Region v) v
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:else default-region))
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(defn describe-volumes
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"Returns a set of org.jclouds.aws.ec2.domain.Volume instances corresponding to the
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volumes in the specified region (defaulting to your account's default region).
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e.g. (with-compute-service [compute] (describe-volumes))
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(with-compute-service [compute] (describe-volumes :us-east-1 \"vol-6b218805\" ...))"
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[& [region & volume-ids]]
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(set
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(.describeVolumesInRegion (ebs-services)
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(as-region region Region/DEFAULT)
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(into-array String (if (as-region region)
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volume-ids
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(cons region volume-ids))))))
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(defvar- snapshot-options-ops
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{:ids #(.snapshotIds % (into-array %2))
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:owners #(.ownedBy % (into-array %2))
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:restorable-by #(.restorableBy % (into-array %2))})
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(defn- snapshot-options
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[options-seq]
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(let [optmap (apply hash-map options-seq)
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string-array #(let [v (% optmap)]
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(into-array String (if (string? v) [v] v)))]
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(-> (DescribeSnapshotsOptions.)
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(.ownedBy (string-array :owner))
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(.snapshotIds (string-array :ids))
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(.restorableBy (string-array :restorable-by)))))
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(defn describe-snapshots
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"Returns a set of org.jclouds.aws.ec2.domain.Snapshot instances corresponding to the
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snapshots in the specified region (defaulting to your account's default region)
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limited according to the further options provided.
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This returns all of the snapshots you own (you can also provide \"amazon\" or an AWS
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account ID here):
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(with-compute-service [compute]
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(describe-snapshots [:owner \"self\"]))
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This returns metadata on the two specified snapshots in us-west-1 (assuming you have access to them):
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(with-compute-service [compute]
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(describe-snapshots :us-west-1 [:ids [\"snap-44b3ab2d\" \"snap-9e8821f7\"]]))
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There is also a :restorable-by option. Option values can be provided as strings, or
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collections of strings."
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[& [region & option-keyvals]]
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(let [options (apply snapshot-options
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(if (as-region region)
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option-keyvals
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(cons region option-keyvals)))]
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(set
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(.describeSnapshotsInRegion (ebs-services)
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(as-region region Region/DEFAULT)
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(into-array DescribeSnapshotsOptions [options])))))
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(defn- as-string
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[v]
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(cond
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(string? v) v
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(keyword? v) (name v)
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:else v))
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(defn- get-string
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[map key]
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(as-string (get map key)))
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(defn- as-int
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[v]
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(cond
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(number? v) (int v)
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(string? v) (Integer/parseInt v)
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:else (throw (IllegalArgumentException.
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(str "Don't know how to convert object of type " (class v) " to a string")))))
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(defn create-volume
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"Creates a new volume given a set of options. :zone is required, one
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or both of :size and :snapshot may also be provided; all values can be strings or keywords,
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:size may be a number, and :zone may be a org.jclouds.aws.ec2.domain.AvailabilityZone.
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Returns the created org.jclouds.aws.ec2.domain.Volume.
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e.g. (with-compute-service [compute]
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(create-volume :zone :us-east-1a :size 250)
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(create-volume :zone :eu-west-1b :snapshot \"snap-252310af\")
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(create-volume :zone :eu-west-1b :snapshot \"snap-252310af\" :size :1024))"
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[& options]
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(when (-> options count odd?)
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(throw (IllegalArgumentException. "Must provide key-value pairs, e.g. :zone :us-east-1d :size 200")))
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(let [options (apply hash-map options)
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snapshot (get-string options :snapshot)
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size (-?> (get-string options :size) as-int)
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zone (get-string options :zone)
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zone (if zone
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(if (instance? AvailabilityZone zone)
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zone
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(AvailabilityZone/fromValue zone))
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(throw (IllegalArgumentException. "Must supply a :zone option.")))
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ebs (ebs-services)]
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(cond
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(and snapshot size) (.createVolumeFromSnapshotInAvailabilityZone ebs zone size snapshot)
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snapshot (.createVolumeFromSnapshotInAvailabilityZone ebs zone snapshot)
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size (.createVolumeInAvailabilityZone ebs zone size)
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:else (throw (IllegalArgumentException. "Must supply :size and/or :snapshot options.")))))
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(defn delete-volume
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"Deletes a volume in the specified region.
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e.g. (with-compute-service [compute]
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(delete-volume :us-east-1 :vol-45228a6d)
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(delete-volume :us-east-1 \"vol-052b846c\"))"
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[region volume-id]
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(.deleteVolumeInRegion (ebs-services)
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(as-region region)
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(as-string volume-id)))
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(defn attach-volume
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"Attaches a volume to an instance, returning the resulting org.jclouds.aws.ec2.domain.Attachment.
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The region must be a keyword or Region instance; the remaining parameters may be
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strings or keywords.
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e.g. (with-compute-service [compute]
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(attach-volume :us-east-1 :vol-45228a6d \"i-a92358c1\" \"/dev/sdh\"))"
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[region & [volume-id instance-id device :as options]]
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(apply #(.attachVolumeInRegion (ebs-services)
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(as-region region) % %2 %3)
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(map as-string options)))
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(defn detach-volume
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"Detatches a volume from the instance to which it is currently attached.
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The optional force? parameter, if logically true, will cause the volume to be forcibly
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detached, regardless of whether it is in-use (mounted) or not.
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(It appears that issuing a detatch-volume command while the volume in question is mounted
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will cause the volume to be detatched immediately upon the volume beign unmounted."
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[region volume-id & [force?]]
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(.detachVolumeInRegion (ebs-services)
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(as-region region)
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(as-string volume-id)
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(boolean force?)
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(into-array DetachVolumeOptions [])))
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