34 lines
1.3 KiB
Common Lisp
34 lines
1.3 KiB
Common Lisp
(in-package :whatsxmpp)
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(defun octets-to-lowercase-hex (buf)
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"Formats BUF, a vector of octets, as a lowercase hex string and returns it."
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(declare (type (vector (unsigned-byte 8)) buf))
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(format nil "~(~{~2,'0X~}~)" (coerce buf 'list)))
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(defun sha1-octets (buf)
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"Returns the SHA1 of BUF, a vector of octets, in lowercase hex."
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(octets-to-lowercase-hex (ironclad:digest-sequence :sha1 buf)))
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(defun sha1-hex (str)
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"Returns the SHA1 of STR, a string, in lowercase hex."
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(sha1-octets (babel:string-to-octets str)))
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(defun child-elements (node)
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"Returns the child elements (excluding text nodes) of the CXML DOM node NODE."
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(remove-if-not #'dom:element-p (dom:child-nodes node)))
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(defun nil-empty (seq)
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"If SEQ (a sequence) is empty, returns NIL; otherwise, returns SEQ."
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(unless (eql (length seq) 0) seq))
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(defmacro with-promise-from-thread (() &body forms)
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"Return a promise that executes FORMS in a new thread, resolving the promise with the return value of (PROGN ,@FORMS) or rejecting it if an ERROR condition is thrown (with said condition)."
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(let ((resolve (gensym))
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(reject (gensym)))
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`(with-promise (,resolve ,reject)
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(bt:make-thread
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(lambda ()
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(handler-case
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(,resolve (progn ,@forms))
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(error (e) (,reject e))))))))
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