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(use-modules (rnrs conditions)
(rnrs io ports)
(rnrs records syntactic)
(srfi srfi-1)
(srfi srfi-11)
(srfi srfi-19)
(srfi srfi-26)
(srfi srfi-37)
(ice-9 match)
(ice-9 popen)
(web client)
(web http)
(web response)
(json)
(lens))
(define-record-type (<droplet> droplet droplet?)
(fields (immutable id droplet-id)
(immutable name droplet-name)))
(define-record-type (<snapshot> snapshot snapshot?)
(fields (immutable id snapshot-id)
(immutable name snapshot-name)
(immutable date snapshot-date)))
(define (call-with-input-pipe command proc)
"Call @var{proc} with input pipe to @var{command}. @var{command} is a
list of program arguments."
(match command
((prog args ...)
(let ((port #f))
(dynamic-wind
(lambda ()
(set! port (apply open-pipe* OPEN_READ prog args)))
(cut proc port)
(lambda ()
(unless (zero? (close-pipe port))
(error "Command invocation failed" command))))))))
(define (get-api-key api-key-command)
"Run @var{api-key-command} and get the API key."
;; We use a shell to execute since
;; 1. api-key-command is a string, not a list of string arguments
;; 2. api-key-command may contain pipes
(string-trim-right
(call-with-input-pipe `("sh" "-c" ,api-key-command)
get-string-all)
#\newline))
(define* (json-request method url #:key (headers '()) body)
"Send a HTTP @var{method} request to @var{url} with @var{body} and
additional @var{headers}. Return JSON response."
(let-values (((response body)
(http-request url
#:method method
#:headers headers
#:body body
#:streaming? #t)))
;; Guile does not consider application/json responses as textual, and does
;; not automatically set the port encoding to UTF-8.
(when body
(set-port-encoding! body "UTF-8"))
(case (quotient (response-code response)
100)
((2) (and body
(json->scm body)))
((4)
(raise-exception
(condition (make-violation)
(make-irritants-condition (list method url headers body))
(make-message-condition
(string-append "JSON API request failed with client error code "
(number->string (response-code response)))))))
(else
(raise-exception
(condition (make-error)
(make-irritants-condition (list method url headers body))
(make-message-condition
(string-append "JSON API request failed with code "
(number->string (response-code response))))))))))
(define* (json-get url #:key (headers '()))
"Send a GET request to @var{url} with @var{headers}. Return JSON response."
(json-request 'GET url
#:headers headers))
(define* (json-post url #:key (headers '()) json)
"Send a POST request to @var{url} with @var{json} body and additional
@var{headers}. The @samp{Content-Type} header is set to @samp{application/json}
and need not be specified in @var{headers}. Return JSON response."
(json-request 'POST url
#:headers `((content-type application/json)
,@headers)
#:body (scm->json-string json)))
(define* (json-delete url #:key (headers '()))
"Send a DELETE request to @var{url} with @var{headers}. Return JSON response."
(json-request 'DELETE url
#:headers headers))
;; Declare the Authorization header as opaque so that Guile doesn't try to mess
;; with it.
(declare-opaque-header! "Authorization")
(define (digitalocean-droplets api-key)
"Return list of all droplets. @var{api-key} is the DigitalOcean API key for
authentication."
(map (lambda (tree)
(droplet (focus (key-ref "id") tree)
(focus (key-ref "name") tree)))
(vector->list (focus (key-ref "droplets")
(json-get "https://api.digitalocean.com/v2/droplets"
#:headers `((authorization
. ,(string-append "Bearer " api-key))))))))
(define (digitalocean-snapshots api-key)
"Return list of all snapshots. @var{api-key} is the DigitalOcean API key for
authentication."
(map (lambda (tree)
(snapshot (focus (key-ref "id") tree)
(focus (key-ref "name") tree)
(string->date (focus (key-ref "created_at") tree)
"~Y-~m-~dT~H:~M:~S~z")))
(vector->list (focus (key-ref "snapshots")
(json-get "https://api.digitalocean.com/v2/snapshots"
#:headers `((authorization
. ,(string-append "Bearer " api-key))))))))
(define (current-unix-time)
(time-second (date->time-monotonic (current-date))))
(define (digitalocean-create-snapshot droplet api-key)
(json-post (string-append "https://api.digitalocean.com/v2/droplets/"
(number->string (droplet-id droplet))
"/actions")
#:headers `((authorization
. ,(string-append "Bearer " api-key)))
#:json `(("type" . "snapshot")
("name" . ,(string-append (droplet-name droplet)
"-"
(number->string (current-unix-time)))))))
(define (digitalocean-delete-snapshot snapshot-id api-key)
(json-delete (string-append "https://api.digitalocean.com/v2/snapshots/"
(number->string snapshot-id))
#:headers `((authorization
. ,(string-append "Bearer " api-key)))))
(define (date-listing date)
(string-append (date->string date "~A, ~B ~e, ")
(string-trim (date->string date "~l:~M ~p"))))
(define (list-snapshots api-key)
(for-each (lambda (snapshot)
(display (string-join (list (snapshot-id snapshot)
(snapshot-name snapshot)
(date-listing (snapshot-date snapshot)))
"\t"))
(newline))
(digitalocean-snapshots api-key)))
(define (list-droplets api-key)
(for-each (lambda (droplet)
(display (string-join (list (number->string (droplet-id droplet))
(droplet-name droplet))
"\t"))
(newline))
(digitalocean-droplets api-key)))
(define (create-snapshot of-droplet-id api-key)
(digitalocean-create-snapshot (find (lambda (droplet)
(= (droplet-id droplet)
of-droplet-id))
(digitalocean-droplets api-key))
api-key))
(define (delete-snapshot snapshot-id api-key)
(digitalocean-delete-snapshot snapshot-id api-key))
(define (main)
(let ((api-key (get-api-key "pass dev/digitalocean | awk '/^api-key/ { print $2 }'")))
(match (program-arguments)
((program "list-droplets")
(list-droplets api-key))
((program "list-snapshots")
(list-snapshots api-key))
((program "create-snapshot" droplet-id)
(create-snapshot (string->number droplet-id) api-key))
((program "delete-snapshot" snapshot-id)
(delete-snapshot (string->number snapshot-id) api-key))
((program _ ...)
(format (current-error-port)
"Usage: ~a ACTION
Actions:
~a list-droplets
~a list-snapshots
~a create-snapshot DROPLET-ID
~a delete-snapshot SNAPSHOT-ID~%"
program
program
program
program
program)
(exit #f)))))
(main)
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