-
Notifications
You must be signed in to change notification settings - Fork 1
/
specification.clj
81 lines (71 loc) · 3.12 KB
/
specification.clj
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
(ns configurati.specification
(:require
[configurati.parameters :refer [default check convert validate]]))
(defprotocol Evaluatable
(evaluate [configuration-specification configuration-source]))
(defn- evaluation-result [configuration-source]
{:missing []
:invalid []
:unconvertible []
:reasons {}
:original configuration-source
:evaluated {}})
(defn- error-free? [evaluation-result]
(and
(empty? (:missing evaluation-result))
(empty? (:invalid evaluation-result))
(empty? (:unconvertible evaluation-result))))
(defn- with-error [evaluation-result parameter-name error]
(let [error-type (:error error)
reason (:reason error)]
(if reason
(-> evaluation-result
(update-in [error-type] #(conj % parameter-name))
(update-in [:reasons] #(merge % {parameter-name reason})))
(update-in evaluation-result [error-type] #(conj % parameter-name)))))
(defn- with-value [evaluation-result parameter-name value]
(update-in evaluation-result [:evaluated] #(assoc % parameter-name value)))
(defn- determine-evaluation-result [parameters configuration-source key-fn]
(reduce
(fn [evaluation-result parameter]
(let [parameter-name (:name parameter)
initial (parameter-name configuration-source)
defaulted (default parameter initial)
inspection (check parameter defaulted)
conversion (convert parameter defaulted)
converted (:value conversion)
validation (validate parameter converted)
inspection-error (select-keys inspection [:error :reason])
conversion-error (select-keys conversion [:error])
validation-error (select-keys validation [:error :reason])]
(cond
(:error inspection-error)
(with-error evaluation-result parameter-name inspection-error)
(:error conversion-error)
(with-error evaluation-result parameter-name conversion-error)
(:error validation-error)
(with-error evaluation-result parameter-name validation-error)
:default
(with-value evaluation-result (key-fn parameter-name) converted))))
(evaluation-result configuration-source)
parameters))
(defrecord ConfigurationSpecification
[parameters key-fn]
Evaluatable
(evaluate [_ configuration-source]
(let [evaluation-result (determine-evaluation-result
parameters
configuration-source
key-fn)
valid? (error-free? evaluation-result)
missing-parameters (:missing evaluation-result)
invalid-parameters (:invalid evaluation-result)
unconvertible-parameters (:unconvertible evaluation-result)]
(if valid?
(:evaluated evaluation-result)
(throw (ex-info
(str "Configuration evaluation failed. "
"Missing parameters: " missing-parameters ", "
"invalid parameters: " invalid-parameters ", "
"unconvertible parameters: " unconvertible-parameters ".")
evaluation-result))))))