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fix pdf renderer exceptions being ignore due to the write-pdf! future

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Gered 2017-08-17 20:05:01 -04:00
parent 797232f2a6
commit 8d1cde6129
1 changed files with 24 additions and 17 deletions
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41
src/clj_htmltopdf/core.clj
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@ -46,31 +46,38 @@
html-doc))
(defn write-pdf!
^InputStream [^Document html-doc options]
[^Document html-doc options]
(let [builder (PdfRendererBuilder.)
base-uri (o/->base-uri options)]
(obj/set-object-drawer-factory builder options)
(.withW3cDocument builder (DOMBuilder/jsoup2DOM html-doc) base-uri)
(let [piped-in (PipedInputStream.)
piped-out (PipedOutputStream. piped-in)]
(future
(try
(with-open [os piped-out]
(.toStream builder os)
(.run builder))
(catch Exception ex
(println "Exception while rendering PDF" ex))))
piped-in)))
piped-out (PipedOutputStream. piped-in)
renderer (future
(try
(with-open [os piped-out]
(.toStream builder os)
(.run builder))
(catch Exception ex
(throw (Exception. "Exception while rendering PDF" ex)))))]
{:pdf piped-in
:renderer renderer})))
(defn ->pdf
[in out & [options]]
(let [options (o/get-final-options options)
html-doc (prepare-html in options)]
(configure-logging! options)
(let [pdf (write-pdf! html-doc options)
out (->output-stream out)]
(if (:watermark options)
(w/write-watermark! pdf out options)
(with-open [os out]
(io/copy pdf os)
os)))))
(let [{:keys [pdf renderer]} (write-pdf! html-doc options)
out (->output-stream out)
result (if (:watermark options)
(w/write-watermark! pdf out options)
(with-open [os out]
(io/copy pdf os)
os))]
; this is a little weird, but because of the whole piped stream thing in write-pdf!, we need to render the
; PDF in a future. if something throws an exception during rendering, it would otherwise get eaten silently by
; the future... except if we deref the future! thus the explicit call to deref it here
(deref renderer)
result)))