From 4792097ca56f278344f18a0a78aaca1278fd146e Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Sat, 27 Feb 2021 19:12:07 +0100
Subject: Move everything from `l/` into the project root

This is the final project. Now that we got rid of the web extension and
native host code, we can move the Lisp code to the root.
---
 src/main.lisp | 141 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 src/main.lisp

(limited to 'src/main.lisp')

diff --git a/src/main.lisp b/src/main.lisp
new file mode 100644
index 0000000..5e44158
--- /dev/null
+++ b/src/main.lisp
@@ -0,0 +1,141 @@
+(in-package :extreload)
+
+(defvar *wg* (wait-group:make-wait-group))
+(defvar *devtools-root-call-id* (make-instance 'call-id)
+  "DevTools Protocol call ID.")
+(defvar *devtools-secondary-call-id* (make-instance 'call-id)
+  "DevTools Protocol call ID used for messages to individual target sessions.")
+
+(defconstant +timeout-seconds+ 5
+  "Global timeout. The program will exit at the end of this delay.")
+
+(defun main ()
+  (handler-bind ((error #'(lambda (e)
+                            (exit-with-error e sysexits:+unavailable+))))
+
+    ;; Store the config as a global.
+    (defvar *config* (parse-options))
+
+    (trivial-timeout:with-timeout (+timeout-seconds+)
+      (with-websocket-connection ((ws-client *config*))
+        (wsd:on :message (ws-client *config*)
+                #'(lambda (message)
+                    (ws-on-message
+                      message
+                      (extension-ids *config*)
+                      *config*)))
+
+        (websocket-send
+          (ws-client *config*)
+          (target-get-targets-msg
+            (next-call-id *devtools-root-call-id*)))
+
+        (wait-group:wait *wg*)))))
+
+(defun ws-on-message (message extension-ids config)
+  "Called when a WebSocket message is received."
+  (let* ((response (jsown:parse message))
+         (targets (parse-get-targets-response response)))
+    (when (debug-output config)
+      (format t "Response: ~a~%" response)
+      (format t "~a~%" *wg*))
+
+    (when targets
+      (let ((targets (extension-targets targets)))
+
+        (attach-extensions targets extension-ids)))
+
+    (if (target-attached-to-target-msg-p response)
+        (reload-extension (json-obj-get
+                            (json-obj-get response "params")
+                            "sessionId")))
+
+    (when (and (reload-current-tab config)
+               (runtime-evaluate-msg-p response))
+      (reload-tab (json-obj-get
+                    (json-obj-get response "result")
+                    "sessionId")))
+
+    ;; Failed to reload tab.
+    (when (runtime-evaluate-exception-p response)
+      ;; `reload-tab` adds an extra increment to the wait group. If the call
+      ;; fails, we only receive one message instead of two, so the wait group
+      ;; must be decremented to match.
+      (wait-group:done *wg*)
+
+      (reload-tab (json-obj-get response "sessionId")))
+
+    (wait-group:done *wg*)))
+
+(defun json-obj-get (obj key)
+  "Get the value of `key` from `obj` (a `jsown` object). Return nil if `key` is
+not defined."
+  (handler-case
+    (jsown:val obj key)
+    (simple-error (e)
+                  (let ((s (format nil "~A" e)))
+                    (if (search "not available" s)
+                        nil)))))
+
+(defun attach-extensions (targets extension-ids)
+  "Attach to all extensions in `targets` that match the IDs in
+`extension-ids`."
+  (labels ((requested-extension-p (target)
+             (find-if
+               #'(lambda (id)
+                   (uiop:string-prefix-p
+                     (concatenate 'string "chrome-extension://" id)
+                     (json-obj-get target "url")))
+               extension-ids)))
+
+    (dolist (extension (filter #'requested-extension-p targets))
+      (attach-to-target extension))))
+
+(defun attach-to-target (extension)
+  "Send a message to the target in `extension` asking to attach to the target."
+  (let ((target-id (json-obj-get extension "targetId")))
+    (websocket-send (ws-client *config*)
+              (target-attach-to-target-msg
+                (next-call-id *devtools-root-call-id*)
+                target-id))))
+
+(defun reload-extension (session-id)
+  "Send a message to an extension page corresponding to `session-id`, telling
+the target extension to reload itself."
+  (websocket-send
+    (ws-client *config*)
+    (runtime-evaluate-msg
+      (next-call-id *devtools-secondary-call-id*)
+      session-id
+      "chrome.runtime.reload()")))
+
+(defun reload-tab (session-id)
+  "Send a message to an extension page corresponding to `session-id`, telling
+the target to reload the current tab."
+
+  ;; Two response messages always come back from the `chrome.tabs.reload()`
+  ;; messages, so we need to add a second increment to the wait group.
+  (wait-group:add *wg*)
+
+  (websocket-send
+    (ws-client *config*)
+    (runtime-evaluate-msg
+      (next-call-id *devtools-secondary-call-id*)
+      session-id
+      "chrome.tabs.reload()")))
+
+(defun extension-targets (targets)
+  "Filter `targets`, returning a list of targets corresponding to extensions."
+  (labels ((extensionp (target)
+             (string= (json-obj-get target "type")
+                      "background_page")))
+
+    (filter #'extensionp targets)))
+
+(defun websocket-send (client data)
+  "Send `data` to WebSocket `client` and increment `*wg*`."
+  (when (debug-output *config*)
+    (format t "Sending: ~a~%" data))
+
+  (wsd:send client data)
+  (wait-group:add *wg*))
-- 
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