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core.clj
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(ns ez-database.core
(:require [clojure.java.jdbc :as jdbc]
[clojure.string :as str]
[ez-database.transform :as transform]
[honeysql.core :as honeysql]))
(defprotocol IEzDatabase
(query [database query] [database opts-key? query] [database opts? key? query] [database opts key query args])
(query! [database query] [database opts-key? query] [database opts? key? query] [database opts key query args])
(query<! [database query] [database opts-key? query] [database opts? key? query] [database opts key query args])
(databases [database]))
(def ^{:private true
:dynamic true} *register-opts* (atom {}))
(def ^{:private true
:dynamic true} *register-queries* (atom {}))
(defn register-opts! [k opts]
(swap! *register-opts* assoc k opts))
(defn unregister-opts! [k]
(swap! *register-opts* dissoc k))
(defn get-opts [opts]
(if (keyword? opts)
(get @*register-opts* opts)
opts))
(defn- query-kw? [x]
;; In order to qualify as a query that's been registered it needs to start with query.
;; This is because keywords are also used for specifying which database the query should be
;; run against
(if (keyword? x)
(if-let [x-ns (namespace x)]
(str/starts-with? x-ns "query"))))
(defn register-query! [k [opts key query :as data]]
(assert (query-kw? k) "k must be a namespaced keyword starting with query like this :query/test")
(assert (vector? data) "query must be a vector of [opts key query]")
(assert (or (nil? opts) (keyword? opts) (and (map? opts) (:opts (meta opts)))) "opts must either be nil, a keyword or a map with :opts meta set to true")
(assert (or (nil? key) (keyword? key)) "key must be either nil or a keyword")
(assert (or (fn? query) (map? query) (string? query)) "query must be either a function, a map or a string")
(swap! *register-queries* assoc k data))
(defn unregister-query! [k]
(swap! *register-queries* dissoc k))
(defn clear-queries! []
(reset! *register-queries* {}))
(defn get-query [k]
(get @*register-queries* k))
;; multimethod for handling of returned values, post query
(def post-query nil)
(defmulti post-query (fn [k v db values] k))
(defmethod post-query [:transformation :post] [_ [from to opts] _ values]
(cond (map? values)
(transform/transform opts from to values)
(sequential? values)
(map #(transform/transform opts from to %) values)
:else
values))
(defmethod post-query [:remove-ks :post] [_ ks _ values]
(cond (map? values)
(apply dissoc values ks)
(sequential? values)
(map #(apply dissoc % ks) values)
:else
values))
(defmethod post-query [:remove :post] [_ pred _ values]
(cond (map? values)
(into {} (remove pred values))
(sequential? values)
(map #(into {} (remove pred %)) values)
:else
values))
(defmethod post-query [:filter :post] [_ pred _ values]
(cond (map? values)
(into {} (filter pred values))
(sequential? values)
(map #(into {} (filter pred %)) values)
:else
values))
(defmethod post-query :default [_ _ _ values]
values)
(defn- run-post-query [db opts values]
(if opts
(reduce (fn [out [k v]]
(post-query k v db out))
values opts)
values))
;; multimethod for args, pre query
(def process-args nil)
(defmulti process-args (fn [k v db args] k))
(defmethod process-args [:transformation :pre] [_ [from to opts] _ args]
(cond (map? args)
(transform/transform opts from to args)
(sequential? args)
(map #(transform/transform opts from to %) args)
:else
args))
(defmethod process-args [:remove-ks :pre] [_ ks _ args]
(cond (map? args)
(apply dissoc args ks)
(sequential? args)
(map #(apply dissoc % ks) args)
:else
args))
(defmethod process-args [:remove :pre] [_ pred _ args]
(cond (map? args)
(into {} (remove pred args))
(sequential? args)
(map #(into {} (remove pred %)) args)
:else
args))
(defmethod process-args [:filter :pre] [_ pred _ args]
(cond (map? args)
(into {} (filter pred args))
(sequential? args)
(map #(into {} (filter pred %)) args)
:else
args))
(defmethod process-args :default [_ _ _ args]
args)
(defn- run-process-args [db opts args]
(if opts
(reduce (fn [out [k v]]
(process-args k v db out))
args opts)
args))
(def process-query nil)
(defmulti process-query (fn [k & _] k))
(defmethod process-query :default [_ _ _ out]
out)
(defn- run-process-query [db opts query args]
(if opts
(reduce (fn [out [k v]]
(process-query k v db out))
[query args] opts)
[query args]))
(defn get-args [{:keys [db-specs] :as db} query? opts? key? args?]
(if (query-kw? query?)
(if-let [[opts key query :as data] (get @*register-queries* query?)]
(let [-opts (get @*register-opts* opts opts)
args (run-process-args db -opts (cond (some? args?) args?
(some? key?) key?
(some? opts?) opts?
:else nil))
[-query -args] (run-process-query db -opts query args)]
[-query -opts (or key :default) -args])
(throw (ex-info "Missing registered query" {:query query?})))
(let [reg-opts @*register-opts*
opts (cond (contains? reg-opts opts?) (get reg-opts opts?)
(contains? reg-opts key?) (get reg-opts key?)
(contains? reg-opts query?) (get reg-opts query?)
(contains? reg-opts args?) (get reg-opts args?)
(:opts (meta opts?)) opts?
(:opts (meta key?)) key?
(:opts (meta query?)) query?
(:opts (meta args?)) args?
:else nil)
key (cond (get db-specs opts?) opts?
(get db-specs key?) key?
:else nil)
query (->> [key? opts? query? args?]
(remove #(or (nil? %) (contains? reg-opts %) (= % key) (= % opts)))
first)
args (run-process-args db opts (->> [args? query? key? opts?]
(remove (into #{} (remove nil? [key opts query])))
(remove #(contains? reg-opts %))
first))
[-query -args] (run-process-query db opts query args)]
[-query opts (or key :default) -args])))
(defprotocol IEzQuery
(run-query [query database] [query database args])
(run-query! [query database] [query database args])
(run-query<! [query database] [query database args]))
(def ^:dynamic *connection* nil)
(defn get-connection [db-specs key]
(if-not (nil? *connection*)
*connection*
(get db-specs key)))
(defmacro with-transaction [binding & body]
`(jdbc/db-transaction* (get-connection (:db-specs (first ~binding)) (second ~binding))
(^{:once true} fn* [~'con]
(binding [*connection* ~'con]
~@body))
~@(rest (rest binding))))
(defn- get-causes-messages [e]
(loop [msg []
e e
breakpoint 0]
(if (or (nil? e)
(> breakpoint 100))
msg
(recur (try
(conj msg (.getMessage e))
(catch Exception _
msg))
(try
(.getNextException e)
(catch Exception _
nil))
(inc breakpoint)))))
(defn- generated-query [query]
(if (map? query)
{:generated-query (honeysql/format query)}))
(defmacro try-query [& body]
`(try
~@body
(catch Exception ~'e
(throw (ex-info "ez-database try-query failed"
(merge
{:type ::try-query
:exception ~'e
:messages (get-causes-messages ~'e)
:query ~'-query}
(generated-query ~'-query)))))))
(defmacro try-query-args [& body]
`(try
~@body
(catch Exception ~'e
(throw (ex-info "ez-database try-query-args failed"
(merge
{:type ::try-query-args
:exception ~'e
:messages (get-causes-messages ~'e)
:query ~'-query
:args ~'args}
(generated-query ~'-query)))))))
(defn throw-msg [msg & args]
(throw (ex-info msg
{:type ::error-msg
:args args})))
(extend-protocol IEzQuery
nil
(run-query
([query db]
(throw-msg "nil can't be run as a query"))
([query db args]
(throw-msg "nil can't be run as a query")))
(run-query!
([query db]
(throw-msg "nil can't be run as a query!"))
([query db args]
(throw-msg "nil can't be run as a query!")))
(run-query<!
([query db]
(throw-msg "nil can't be run as a query<!"))
([query db args]
(throw-msg "nil can't be run as a query<!")))
java.lang.String
(run-query
([query db]
(jdbc/query db [query]))
([query db args]
(jdbc/query db (concat [query] args))))
(run-query!
([query db]
(jdbc/execute! db [query]))
([query db args]
(jdbc/execute! db (concat [query] args))))
(run-query<!
([query db]
(throw-msg "String without args is not allowed for query<!"))
([query db args]
(apply jdbc/insert! db query args)))
clojure.lang.Sequential
(run-query
([query db]
(jdbc/query db query))
([query db args]
(jdbc/query db (concat query args))))
(run-query!
([query db]
(jdbc/execute! db query))
([query db args]
(jdbc/execute! db (concat query args))))
(run-query<!
([query db]
(throw-msg "Sequence is not allowed for query<!"))
([query db args]
(throw-msg "Sequence is not allowed for query<!")))
clojure.lang.IPersistentMap
(run-query
([query db]
(jdbc/query db (honeysql/format query)))
([query db args]
(jdbc/query db (honeysql/format query args))))
(run-query!
([query db]
(jdbc/execute! db (honeysql/format query)))
([query db args]
(jdbc/execute! db (honeysql/format query args))))
(run-query<!
([query db]
(let [table (:insert-into query)
values (:values query)]
(jdbc/insert-multi! db table values)))
([query db args]
(let [table (:insert-into query)
values (:values query)]
(jdbc/insert-multi! db table values))))
clojure.lang.Fn
(run-query
([query db]
(query {} {:connection db}))
([query db args]
(query args {:connection db})))
(run-query!
([query db]
(query {} {:connection db}))
([query db args]
(query args {:connection db})))
(run-query<!
([query db]
(query {} {:connection db}))
([query db args]
(query args {:connection db}))))
(defrecord EzDatabase [db-specs ds-specs]
IEzDatabase
(query [db -query]
(try-query
(if (keyword? -query)
(apply query db (get-query -query))
(run-query -query (get-connection db-specs :default)))))
(query [db opts-key? -query]
(let [[-query opts key args :as asdf] (get-args db opts-key? opts-key? opts-key? -query)]
(try-query-args
(run-post-query db opts
(if (nil? args)
(run-query -query (get-connection db-specs key))
(run-query -query (get-connection db-specs key) args))))))
(query [db opts? key? -query]
(let [[-query opts key args] (get-args db key? opts? key? -query)]
(try-query-args
(run-post-query db opts
(if (nil? args)
(run-query -query (get-connection db-specs key))
(run-query -query (get-connection db-specs key) args))))))
(query [db opts key -query args]
(let [opts (get-opts opts)]
(try-query-args
(run-post-query db opts
(run-query -query (get-connection db-specs key) (run-process-args db opts args))))))
(query! [db -query]
(try-query
(if (keyword? -query)
(apply query! db (get-query -query))
(run-query! -query (get-connection db-specs :default)))))
(query! [db opts-key? -query]
(let [[-query opts key args] (get-args db opts-key? opts-key? opts-key? -query)]
(try-query
(if (nil? args)
(run-query! -query (get-connection db-specs key))
(run-query! -query (get-connection db-specs key) args)))))
(query! [db opts? key? -query]
(let [[-query opts key args] (get-args db key? opts? key? -query)]
(try-query
(if (nil? args)
(run-query! -query (get-connection db-specs key))
(run-query! -query (get-connection db-specs key) args)))))
(query! [db opts key -query args]
(try-query-args
(run-query! -query (get-connection db-specs key) (run-process-args db (get-opts opts) args))))
(query<! [db -query]
(try-query
(if (keyword? -query)
(apply query<! db (get-query -query))
(run-query<! -query (get-connection db-specs :default)))))
(query<! [db opts-key? -query]
(let [[-query opts key args] (get-args db opts-key? opts-key? opts-key? -query)]
(try-query-args
(run-post-query
db opts
(if (nil? args)
(run-query<! -query (get-connection db-specs key))
(run-query<! -query (get-connection db-specs key) args))))))
(query<! [db opts? key? -query]
(let [[-query opts key args] (get-args db key? opts? key? -query)]
(try-query-args
(run-post-query
db opts
(if (nil? args)
(run-query<! -query (get-connection db-specs key))
(run-query<! -query (get-connection db-specs key) args))))))
(query<! [db opts key -query args]
(let [opts (get-opts opts)]
(try-query-args
(run-post-query
db opts
(run-query<! -query (get-connection db-specs key) (run-process-args db opts args))))))
(databases [db]
(keys db-specs)))