[英]Clojure: How to restore REPL after exception?
使用 mount 重新启动/重新加载应用程序后出现错误时,正确的工作流程是什么?
一个例子:
user> (restart)
#error {
:cause "Unable to resolve symbol: account-database in this context"
:via
[{:type clojure.lang.Compiler$CompilerException
:message "Syntax error compiling at (app/model/session.clj:55:39)."
:data #:clojure.error{:phase :compile-syntax-check, :line 55, :column 39, :source "app/model/session.clj"}
:at [clojure.lang.Compiler analyze "Compiler.java" 6808]}
{:type java.lang.RuntimeException
:message "Unable to resolve symbol: account-database in this context"
:at [clojure.lang.Util runtimeException "Util.java" 221]}]
:trace
[[clojure.lang.Util runtimeException "Util.java" 221]
Reloadable Clojure REPL
user> (restart)
Syntax error compiling at (*cider-repl Projects/pollcro:localhost:43993(clj)*:597:7).
Unable to resolve symbol: restart in this context
user> (start)
Syntax error compiling at (*cider-repl Projects/pollcro:localhost:43993(clj)*:600:7).
Unable to resolve symbol: start in this context
修复错误后,由于以下错误,我无法(重新启动)此回复:
无法解析符号:在此上下文中重新启动
作为一种解决方法,我退出我的 REPL session 并重新启动它,但这很烦人。
看来我可以在修复错误后使用 mount/start :
user> (mount/start)
{:started
["#'app.server-components.config/config"
"#'app.model.database/pool"
"#'app.model.mock-database/conn"]}
但它完全失去了我的用户命名空间 scope,REPL 看不到它的任何方法 + 由于以下错误,我无法将用户命名空间发送到 repl:
Syntax error compiling at (app/server_components/pathom.clj:1:1).
namespace 'app.model.session' not found
("src/main" "src/dev" "src/test")#function[expound.alpha/printer]nil#'user/start#'user/stop#'user/restartnil
这就是我的用户命名空间的样子:
(ns user
(:require
[clojure.tools.namespace.repl :as tools-ns :refer [set-refresh-dirs]]
[expound.alpha :as expound]
[clojure.spec.alpha :as s]
[mount.core :as mount]
;; this is the top-level dependent component...mount will find the rest via ns requires
[app.server-components.http-server :refer [http-server]]))
;; ==================== SERVER ====================
(set-refresh-dirs "src/main" "src/dev" "src/test")
;; Change the default output of spec to be more readable
(alter-var-root #'s/*explain-out* (constantly expound/printer))
(defn start
"Start the web server"
[] (mount/start))
(defn stop
"Stop the web server"
[] (mount/stop))
(defn restart
"Stop, reload code, and restart the server. If there is a compile error, use:
(tools-ns/refresh)
to recompile, and then use `start` once things are good."
[]
(stop)
(tools-ns/refresh :after 'user/start))
这是在出现错误时似乎可行的解决方法:
user
命名空间user
命名空间的内容发送到 REPL 此时您可以使用常规的(start)
、 (stop)
、 (restart)
。
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