breezewiki/src/config.rkt
Cadence Ember e709b3cea5
New configuration: feature_search_suggestions
Default true. Set this to false to disable search suggestions for the
whole instance.
2022-10-23 00:35:34 +13:00

110 lines
3.5 KiB
Racket

#lang typed/racket/base
(require racket/function
racket/pretty
racket/runtime-path
racket/string)
(require/typed ini
[#:opaque Ini ini?]
[read-ini (Input-Port -> Ini)]
[ini->hash (Ini -> (Immutable-HashTable Symbol (Immutable-HashTable Symbol String)))])
(provide
config-parameter
config-true?
config-get)
(module+ test
(require "typed-rackunit.rkt"))
(define-runtime-path path-config "../config.ini")
(: config-parameter (Symbol -> (Parameterof String)))
(define (config-parameter key)
(hash-ref config key))
(: config-true? (Symbol -> Boolean))
(define (config-true? key)
(not (member ((config-parameter key)) '("" "false"))))
(: config-get (Symbol -> String))
(define (config-get key)
((config-parameter key)))
(define default-config
'((application_name . "BreezeWiki")
(canonical_origin . "")
(debug . "false")
(feature_search_suggestions . "true")
(instance_is_official . "false") ; please don't turn this on, or you will make me very upset
(log_outgoing . "true")
(port . "10416")
(strict_proxy . "true")))
(define loaded-alist
(with-handlers
([exn:fail:filesystem:errno?
(λ (exn)
(begin0
'()
(displayln "note: config file not detected, using defaults")))]
[exn:fail:contract?
(λ (exn)
(begin0
'()
(displayln "note: config file empty or missing [] section, using defaults")))])
(define l
(hash->list
(hash-ref
(ini->hash
(call-with-input-file path-config
(λ (in)
(read-ini in))))
'||)))
(begin0
l
(printf "note: ~a items loaded from config file~n" (length l)))))
(define env-alist
(let ([e-names (environment-variables-names (current-environment-variables))]
[e-ref (λ ([name : Bytes])
(bytes->string/latin-1
(cast (environment-variables-ref (current-environment-variables) name)
Bytes)))])
(map (λ ([name : Bytes])
(cons (string->symbol (string-downcase (substring (bytes->string/latin-1 name) 3)))
(e-ref name)))
(filter (λ ([name : Bytes]) (string-prefix? (string-downcase (bytes->string/latin-1 name))
"bw_"))
e-names))))
(when (> (length env-alist) 0)
(printf "note: ~a items loaded from environment variables~n" (length env-alist)))
(define combined-alist (append default-config loaded-alist env-alist))
(define config
(make-immutable-hasheq
(map (λ ([pair : (Pairof Symbol String)])
(cons (car pair) (make-parameter (cdr pair))))
combined-alist)))
(when (config-true? 'debug)
; all values here are optimised for maximum prettiness
(parameterize ([pretty-print-columns 80])
(display "config: ")
(pretty-write ((inst sort (Pairof Symbol String))
(hash->list (make-immutable-hasheq combined-alist))
symbol<?
#:key car))))
(when (not (config-true? 'debug))
(when (not (config-true? 'canonical_origin))
(displayln
(string-append "warning: configuring canonical_origin is highly recommended for production!\n"
" see https://docs.breezewiki.com/Configuration.html"))))
(module+ test
; this is just a sanity check
(parameterize ([(config-parameter 'application_name) "JeffWiki"]
[(config-parameter 'strict_proxy) ""])
(check-equal? (config-get 'application_name) "JeffWiki")
(check-false (config-true? 'strict_proxy))))