Trouble parsing a response (Was: Re: New library: guile-wikidata)

[swedebugia]

On 2018-12-13 16:01, address@hidden wrote:
snip

> 
> I tried with the file attached but got this because the driver does not
> support URIs but only host, port, type, token:

Ah, I saw now that you already implemented URI on master :)
https://github.com/roelj/guile-sparql/blob/master/sparql/driver.scm

When I try calling this
;; Example query to wikidata listing cats                               
                                       
(sparql-query
 "SELECT ?item                                                          
                                       
WHERE                                                                   
                                       
{                                                                       
                                       
?item wdt:P31 wd:Q146.                                                  
                                       
}                                                                       
                                       
LIMIT 10                                                                
                                       
"
 #:uri "https://query.wikidata.org/sparql";
 ;; #:port 80                                                           
                                       
 #:type "application/sparql-results+json"
 ;;  #:token "..."                                                      
                                       
 #:store-backend 'blazegraph
 )

I get this fine result:
#<<response> version: (1 . 1) code: 200 reason-phrase: "OK" headers:
((date . #<date nanosecond: 0 second: 12 minute: 32 hour: 15 day: 13
month: 12 year: 2018 zone-offset: 0>) (content-type
application/sparql-results+json (charset . "utf-8")) (transfer-encoding
(chunked)) (connection close) (server . "nginx/1.13.6") (x-served-by .
"wdqs1005") (access-control-allow-origin . "*") (cache-control public
(max-age . 300)) (vary accept accept-encoding) (x-varnish . "644531744,
572094009, 417977651") (via "1.1 varnish (Varnish/5.1)" "1.1 varnish
(Varnish/5.1)" "1.1 varnish (Varnish/5.1)") (accept-ranges bytes) (age .
0) (x-cache . "cp1079 pass, cp3030 pass, cp3030 pass") (x-cache-status .
"pass") (server-timing . "cache;desc=\"pass\"")
(strict-transport-security . "max-age=106384710; includeSubDomains;
preload") (set-cookie .
"WMF-Last-Access=13-Dec-2018;Path=/;HttpOnly;secure;Expires=Mon, 14 Jan
2019 12:00:00 GMT") (set-cookie .
"WMF-Last-Access-Global=13-Dec-2018;Path=/;Domain=.wikidata.org;HttpOnly;secure;Expires=Mon,
14 Jan 2019 12:00:00 GMT") (x-analytics . "https=1;nocookies=1")
(x-client-ip . "83.185.90.53")) port: #<input-output: file 8c37e70>>

My problem now is that I don't know how to separate the header from the
port-file.

Ah, reading here
https://www.gnu.org/software/guile/manual/html_node/Responses.html#Responses
I found (response-port).

Unfortunately this only took me one step further as I run into this
instead when trying to parse the port with (json->scm):

Backtrace:
           7 (apply-smob/1 #<catch-closure 9769550>)
In ice-9/boot-9.scm:
    705:2  6 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8  5 (_ #(#(#<directory (guile-user) 9759910>)))
In ice-9/boot-9.scm:
   2312:4  4 (save-module-excursion _)
  3831:12  3 (_)
In sdb-test.scm:
     24:1  2 (_)
In json/parser.scm:
   311:18  1 (json-read-number _)
   148:28  0 (read-number _)

json/parser.scm:148:28: In procedure read-number:
Throw to key `json-invalid' with args `(#<json-parser port:
#<input-output: string 98dea80>>)'.

Maybe this is a bug in (json)?


Cheers 
Swedebugia

sdb-test.scm
Description: Text document