Update documentation

README.md

@@ -10,11 +10,9 @@ Requirements
 
 To build backend: golang
 
-* wkhtmltopdf (webkit html to pdf renderer) for rastering html
-  must be placed in /usr/bin on the cups server
-  https://github.com/wkhtmltopdf/wkhtmltopdf/releases
 * compiled backend (kohaprinter) must be placed in /usr/lib/cups/backend/ on the cups server
 * a json mapping file (see example) must be placed in same directory as backend and named kohaprinter_mapping.json
+* a running athena pdf service must be found at localhost:8089
 * print job needs two extra options passed for mapping to function: koha-printer-type and koha-origin-ip
 * Cups is strict on permissions, so make sure backend is owned by root and chmod 0755
 * also beware that backend is run by user `lp` so main log turns up in /tmp/kohaprinter.log and
@@ -22,6 +20,13 @@ To build backend: golang
 
 Setup and Testing
 ==
+## 0. Athena document conversion service
+
+You'd be best off with docker:
+
+```
+docker run -p 8089:8080 --rm -d arachnysdocker/athenapdf-service
+```
 
 ## 1. In Cups, a Raw Print Queue must be set up to point to backend.
 
@@ -34,7 +39,7 @@ lpadmin -p KohaKvittPrinter -v kohaprinter:/ -m raw -E
 ```
 
 This means any job sent to this Queue on this Cups server will be passed along to the `kohaprinter` backend
-with the kohaprinter:/ Device URI.
+with the kohaprinter:/ Device URI. (in short, looking for the executable file /usr/lib/cups/backend/kohaprinter)
 
 If the Cups server was running on host, say, `cupsserver`, the queue would now be accessible as normal by Cups, e.g.
 
@@ -95,5 +100,5 @@ What happens is that :
 * html document is sent raw to the Remote Print Queue KohaKvittPrinter
 * it is delegated to the kohaprinter backend which :
   * fetches originating IP and DeviceURI from request
-  * rasters the html document to PDF with Webkit
+  * POSTS the html document as file in multipart form to running HTML->PDF service athenapdf at localhost:8089
   * forwards generated PDF to Print Queue of Thermal Printer or Label Printer found in json mapping