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December 15, 2017 20:08
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Using `pg` from ClojureScript on Node.js with an interface like `postgres.async`
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(ns hello-world.pg | |
(:require | |
[clojure.string :as string] | |
[cljs.nodejs :as nodejs] | |
[cljs.core.async | |
:refer [<! chan put! close! onto-chan to-chan]] | |
[taoensso.timbre :as timbre | |
:refer-macros [tracef debugf infof warnf errorf]]) | |
(:require-macros | |
[cljs.core.async.macros :as m :refer [go]])) | |
(defn result-chan [f & args] | |
(let [channel (chan 1) | |
callback (fn [rs err] | |
(put! channel (or err rs)) | |
(close! channel))] | |
(apply f (concat args [callback])) | |
channel)) | |
(defn open-db | |
"Creates a db connection" | |
[{:keys [hostname port username password database | |
pool-size ssl validation-query pipeline] | |
:as config}] | |
(doseq [param [:hostname :username :password :database]] | |
(when (nil? (param config)) | |
(errorf (str param " is required")) | |
(throw (new js/Error (str param " is required"))))) | |
(-> {"host" hostname | |
"port" (or port 5432) | |
"user" username | |
"database" database | |
"password" password | |
"ssl" (boolean ssl)} | |
(clj->js) | |
(pg.Client.))) | |
(defn open-pool | |
"Creates a db connection pool" | |
[{:keys [hostname port username password database | |
pool-size ssl validation-query pipeline] | |
:as config}] | |
(doseq [param [:hostname :username :password :database]] | |
(when (nil? (param config)) | |
(errorf (str param " is required")) | |
(throw (new js/Error (str param " is required"))))) | |
(-> {"host" hostname | |
"port" (or port 5432) | |
"user" username | |
"database" database | |
"password" password | |
"ssl" (boolean ssl) | |
"max" (or pool-size 20) | |
"idleTimeoutMillis" 30000} | |
(clj->js) | |
(pg.Pool.))) | |
(defn close-db! | |
"Closes a db connection pool" | |
[db] | |
(.close db)) | |
(defn connect! | |
([db] | |
(result-chan connect! db)) | |
([db f] | |
(.connect db | |
(fn [err client done] | |
(f [client done (some-> err (sql-error "CONNECT"))] nil))))) | |
(defn execute! | |
"Executes an sql statement with parameters and returns result rows and update count." | |
([db sql] | |
(result-chan execute! db sql)) | |
([db [sql & params] f] | |
#_(debugf "SQL: %s %s" sql (vec params)) | |
(try | |
(.query db sql | |
(clj->js (vec params)) | |
(fn [err rs] | |
#_(debugf "Execute result: %s" {:err err :rs rs}) | |
(if (some? err) | |
(f nil (sql-error err sql)) | |
(f (result->map rs) nil)))) | |
(catch js/Object err | |
(f nil (sql-error err sql)))))) | |
(defn query! | |
"Executes an sql query with parameters and returns result rows." | |
([db sql] | |
(result-chan query! db sql)) | |
([db sql f] | |
(execute! db sql f))) | |
(defn insert! | |
"Executes an sql insert and returns update count and returned rows. | |
Spec format is | |
:table - table name | |
:returning - sql string" | |
([db sql-spec data] | |
(result-chan insert! db sql-spec data)) | |
([db sql-spec data f] | |
(execute! db (list* (create-insert-sql sql-spec data) | |
(if (map? data) | |
(vals data) | |
(flatten (map vals data)))) | |
f))) | |
(defn update! | |
"Executes an sql update and returns update count and returned rows. | |
Spec format is | |
:table - table name | |
:returning - sql string | |
:where - [sql & params]" | |
([db sql-spec data] | |
(result-chan update! db sql-spec data)) | |
([db sql-spec data f] | |
(execute! db (concat [(create-update-sql sql-spec data)] | |
(rest (:where sql-spec)) | |
(vals data)) | |
f))) |
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