Hi,
I've been trying to go through malu's factor-blog-gitutorial[1] and
I'm at commit 3e91728fd6b2021fc11d, where I should be able to at least
show the list of recent posts and create new posts.
Using the following instructions in the listener, I keep running into
a 500 error from Furnace.
USING: blog db db.sqlite http.server namespaces threads ;
main-responder set-global
[ "blog.db" [ 8080 httpd ] with-db ] in-thread
When I look into the http log (logs/http.server/1.log), it showed the
following errors:
[2011-01-06T01:15:32-05:00] ERROR do-request: sqlite-error
[] ERROR do-request: n 21
[] ERROR do-request: string "Library used incorrectly"
I sprinkled debug log-messages throughout the code and saw that the
problem occurs when attempting to execute select-tuples within the
page-action init quotation, specifically a problem with the
recent-posts word.
The particular code fragments (with debug log messages removed):
: recent-posts ( num -- posts )
f >query
swap >>limit
"created_at desc" >>order
select-tuples ;
: ( -- action )
[ 5 recent-posts "posts" set-value ] >>init
{ blog "recent-posts" } >>template ;
Executing the recent-posts word from the listener:
( scratchpad ) "blog.db" [ 5 recent-posts ] with-db
... returns a proper result (either an empty array, or a result,
depending on whether I entered a post or not previously).
I thought that the problem might be the gitutorial, so I went and
tried to launch webapps.blogs since they seem rather similar.
In the listener, I typed the following:
( scratchpad ) "temp.db" [ main-responder
set-global 8080 httpd ] with-db
However, this resulted in the same error in the http log. With
additional debug messages in webapps.blogs, I was able to narrow down
the issue in a similar place.
In this case, the problem occurs when the select-tuples is called
within the list-posts word.
Checking basis/db/sqlite/ffi/ffi.factor shows the "CONSTANT:
SQLITE_MISUSE 21 ! Library used incorrectly" line. Since that
seemed like a sqlite3.dll lib throwing an error, I ran "db.sqlite"
test in the listener and all of the unit tests passed.
I'm hoping it's just the way that I'm setting up the environment or
perhaps misusing with-db.
At the limit of my Factor capabilities trying to figure this out.
Further information if required:
- Factor win32-2010-12-27
- sqlite3 version 3.7.4
Thanks,
Dave
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