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http_server.clj
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http_server.clj
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(ns common-clj.components.http-server.http-server
(:require [com.stuartsierra.component :as component]
[common-clj.coercion :refer [coerce] :as coercion]
[common-clj.components.config.protocol :as config.protocol]
[common-clj.components.http-server.protocol
:as
http-server.protocol
:refer
[HttpServer]]
[common-clj.json :refer [json->string]]
[common-clj.schemata.http-server :as schemata.http]
[io.pedestal.http :as http]
[io.pedestal.http.body-params :refer [body-params]]
[io.pedestal.interceptor :refer [interceptor]]
[io.pedestal.interceptor.error :as error-int]
[schema.core :as s]
[common-clj.lib.utils :refer [map-vals]]
[common-clj.humanize :as humanize]
[schema.utils :as s-utils]
[common-clj.misc :as misc])
(:import (java.io StringWriter PrintWriter)))
(def default-coercers coercion/default-coercers)
(defn ok [body]
{:status 200
:body body})
(defn wrap-handler [handler components]
(fn [request]
(let [{:keys [status body]} (handler request components)]
{:status status
:body body})))
(def content-type
(interceptor
{:name ::content-type
:leave (fn [context]
(assoc-in context
[:response :headers]
{"Content-Type" "application/json"}))}))
(defn body-coercer
[routes {:keys [override-coercers]}]
(interceptor
{:name ::json-coercer
:enter (fn [{:keys [request route] :as context}]
(let [{:keys [json-params]} request
{:keys [route-name]} route
{:keys [request-schema]} (route-name routes)
coerced-body (when request-schema
(coerce request-schema json-params (or override-coercers default-coercers)))]
(if request-schema
(do
(s/validate request-schema coerced-body)
(assoc-in context [:request :body] coerced-body))
context)))
:leave (fn [{:keys [response route] :as context}]
(let [{:keys [body]} response
{:keys [route-name]} route
{:keys [response-schema]} (route-name routes)
serialized-body (-> body misc/dash->underscore json->string)]
(s/validate response-schema body)
(assoc-in context [:response :body] serialized-body)))}))
(defn path-params-coercer
[routes {:keys [override-coercers]}]
(interceptor
{:name ::path-params-coercer
:enter (fn [{:keys [request route] :as context}]
(let [{:keys [path-params]} request
{:keys [route-name]} route
{:keys [path-params-schema]} (route-name routes)
coerced-path-params (when path-params-schema
(coerce path-params-schema path-params (or override-coercers default-coercers)))]
(if coerced-path-params
(do
(s/validate path-params-schema coerced-path-params)
(assoc-in context [:request :path-params] coerced-path-params))
context)))}))
(defn query-params-coercer
[routes {:keys [override-coercers]}]
(interceptor
{:name ::query-params-coercer
:enter (fn [{:keys [request route] :as context}]
(let [{:keys [query-params]} request
{:keys [route-name]} route
{:keys [query-params-schema]} (route-name routes)
coerced-query-params (when query-params-schema
(coerce query-params-schema query-params (or override-coercers default-coercers)))]
(if coerced-query-params
(do
(s/validate query-params-schema coerced-query-params)
(assoc-in context [:request :query-params] coerced-query-params))
context)))}))
(defn error-interceptor [{:keys [override-humanizer]} env]
(error-int/error-dispatch
[ctx ex]
[{:type :schema-tools.coerce/error}]
(let [values (->> ex ex-data :value)
humanizer (or override-humanizer humanize/humanize)
error-map (->> ex
ex-data
:error
(map-vals #(humanize/explain % humanizer))
(into {}))]
(assoc ctx :response {:status 400 :body (json->string {:error error-map})}))
:else
(let [sw (StringWriter.)
pw (PrintWriter. sw)
e (->> ex ex-data :exception)
_ (.printStackTrace e pw)
response (if (not= :prod env)
{:error "Internal Server Error"
:stack-trace (str sw)}
{:error "Internal Server Error"})]
(assoc ctx :response {:status 500 :body (json->string response)}))))
(defn interceptors [routes overrides env]
[content-type
(error-interceptor overrides env)
(body-params)
(body-coercer routes overrides)
(path-params-coercer routes overrides)
(query-params-coercer routes overrides)])
(s/defn routes->pedestal
[routes :- schemata.http/Routes
overrides :- (s/maybe schemata.http/Overrides)
env :- s/Keyword
components]
(into
#{}
(map
(fn [[route-name {:keys [path method handler]}]]
[path
method
(conj (interceptors routes overrides env) (wrap-handler handler components))
:route-name route-name]))
routes))
(defonce ^:private server (atom nil))
(s/defrecord HttpServerImpl [routes overrides]
component/Lifecycle
(start [{:keys [config] :as components}]
(when (nil? config)
(throw "Missing dependency :config on http-server"))
(let [env (config.protocol/get-env config)
pedestal-routes (routes->pedestal routes overrides env components)
service (http-server.protocol/create-server components)]
(when (not= :test env)
(http/start service)
(reset! server service))
(-> components
(assoc :service service)
(assoc :pedestal-routes pedestal-routes))))
(stop [component]
(http/stop @server)
component)
HttpServer
(create-server [{:keys [config] :as components}]
(let [env (config.protocol/get-env config)
{:keys [http-port]} (config.protocol/get-config config)]
(http/create-server
{::http/routes (routes->pedestal routes overrides env components)
::http/allowed-origins {:creds true :allowed-origins (constantly true)}
::http/host "0.0.0.0"
::http/type :jetty
::http/port (or http-port 80)
::http/join? false}))))
(s/defn new-http-server
([routes :- schemata.http/Routes]
(new-http-server routes {}))
([routes :- schemata.http/Routes
overrides :- schemata.http/Overrides]
(map->HttpServerImpl {:routes routes :overrides overrides})))