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dap-docker.el
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dap-docker.el
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;;; dap-docker.el --- Debug Adapter Protocol mode for docker-wrapped servers -*- lexical-binding: t; -*-
;; Copyright (C) 2022 Andrei Mochalov
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Debug Adapter Protocol client support for Emacs and docker-wrapped servers.
;;; Code:
(require 'dap-mode)
(require 'lsp-mode)
(require 'lsp-docker)
(require 'f)
(require 's)
(require 'ht)
(require 'dash)
(require 'yaml)
(defvar dap-docker-supported-server-types-subtypes
(ht ('docker (list 'container 'image)))
"A list of all supported server types and subtypes, currently only docker
is supported.")
(defun dap-docker--is-enabled? (config)
"Check whether debugging is enabled"
(-when-let* ((server-info (gethash 'debug config))
(server-enabled (gethash 'enabled server-info)))
(not (equal server-enabled :false))))
(defun dap-docker--get-debug-provider-name (config)
"Get the debug provider name also checking whether debugging is enabled"
(-if-let* ((server-info (gethash 'debug config))
(server-enabled (dap-docker--is-enabled? config)))
(gethash 'provider server-info)
(user-error "Either debug is not enabled or the config is invalid!")))
(defun dap-docker--get-debug-template-name (config)
"Get the debug template name also checking whether debugging is enabled"
(-if-let* ((server-info (gethash 'debug config))
(server-enabled (dap-docker--is-enabled? config)))
(gethash 'template server-info)
(user-error "Either debug is not enabled or the config is invalid!")))
(defun dap-docker--get-server-type-subtype (config)
"Get the server type"
(-if-let* ((server-info (gethash 'debug config))
(server-type (gethash 'type server-info))
(server-subtype (gethash 'subtype server-info)))
(cons (if (stringp server-type)
(intern server-type)
server-type)
(if (stringp server-subtype)
(intern server-subtype)
server-subtype))
(lsp-docker-get-server-type-subtype config)))
(defun dap-docker--get-server-container-name (config)
"Get the server container name"
(-if-let* ((server-info (gethash 'debug config))
(server-subtype (gethash 'subtype server-info)))
(if (equal server-subtype "container")
(gethash 'name server-info))
(user-error "No debug container names are specified, you cannot use single container both for a language server and a debugging server")))
(defun dap-docker--get-server-image-name (config)
"Get the server image name"
(-if-let* ((server-info (gethash 'debug config))
(server-subtype (gethash 'subtype server-info)))
(if (equal server-subtype "image")
(gethash 'name server-info))
(lsp-docker-get-server-image-name config)))
(defun dap-docker--get-server-id (config)
"Get the server id"
(let ((server-info (gethash 'debug config)))
(if (stringp (gethash 'server server-info))
(intern (gethash 'server server-info))
(gethash 'server server-info))))
(defun dap-docker--get-path-mappings (config project-root)
"Get the server path mappings"
(lsp-docker-get-path-mappings config project-root))
(defun dap-docker--get-launch-command (config)
"Get the server launch command"
(let ((server-info (gethash 'debug config)))
(gethash 'launch_command server-info)))
(defun dap-docker--check-server-type-subtype (supported-server-types-subtypes server-type-subtype)
"Verify that the combination of server (type . subtype) is supported by the
current implementation"
(if (not server-type-subtype)
(user-error "No server type and subtype specified!"))
(if (ht-find (lambda (type subtypes)
(let ((server-type (car server-type-subtype))
(server-subtype (cdr server-type-subtype)))
(if (and (equal server-type type) (-contains? subtypes server-subtype))
t)))
supported-server-types-subtypes)
server-type-subtype
(user-error "No compatible server type and subtype found!")))
(defun dap-docker--check-path-mappings (path-mappings)
"Verify that specified path mappings are all inside the project directory"
(--all? (or (f-descendant-of? (f-canonical (car it)) (f-canonical (lsp-workspace-root)))
(f-same? (f-canonical (car it)) (f-canonical (lsp-workspace-root))))
path-mappings))
(defun dap-docker--verify-path-mappings-against-container (path-mappings container-name)
"Verify that specified path mappings are all included in container's
path mappings."
(--all? (let ((source (car it))
(destination (cdr it)))
(-any? (lambda (mapping)
(and (f-same? source (car mapping))
(equal destination (cdr mapping))))
(dap-docker--get-path-mappings-from-container container-name)))
path-mappings))
(defun dap-docker--get-path-mappings-from-container (container-name)
"Get path mappings from a container"
(-let (((inspection-command-program . inspection-command-arguments)
(--map-when
(equal it "'{{.Mounts}}'")
"'{{json .Mounts}}'"
(s-split " " (format "%s container inspect -f '{{.Mounts}}' %s" lsp-docker-command container-name)))))
(-let (((exit-code . raw-output) (with-temp-buffer
(cons
(apply #'call-process inspection-command-program nil (current-buffer) nil inspection-command-arguments)
(buffer-string)))))
(if (equal exit-code 0)
(let* ((output (s-chop-prefix "'" (s-chop-suffix "'" (s-chomp raw-output))))
(raw-mappings (append (json-parse-string output) nil)) ; using append to convert a vector to a list
(bind-mappings (--filter (and (equal (gethash "Type" it) "bind") (equal (gethash "RW" it) t)) raw-mappings)))
(--map (cons (f-canonical (gethash "Source" it)) (f-canonical (gethash "Destination" it))) bind-mappings))
(user-error "Cannot analyze the following container: %s, exit code: %d" container-name exit-code)))))
(defconst dap-docker-image-start-string "docker run --rm &mappings& -i &name& &entrypoint&")
(defconst dap-docker-container-start-string "docker start -i &name&")
(defun dap-docker--prepare-image-start-path (image-name path-mappings entrypoint)
"Get a command (splitted by spaces in a list form) for launching a server in
a docker image."
(let* ((command (copy-sequence dap-docker-image-start-string))
(mappings-list (--map (s-join " " (list "-v" (s-join ":" (list (car it) (cdr it))))) path-mappings))
(mappings (s-join " " mappings-list)))
(--> command
(s-replace "&name&" image-name it)
(s-replace "&mappings&" mappings it)
(s-replace "&entrypoint&" entrypoint it))))
(defun dap-docker--prepare-container-start-path (container-name _ _)
"Get a command (splitted by spaces in a list form) for launching a server in
a docker container."
(let ((command (copy-sequence dap-docker-container-start-string)))
(--> command
(s-replace "&name&" container-name it))))
(defun dap-docker--get-dockerized-debug-provider-name (debug-provider-name project-root)
"Create a new debug provider name using the original one and the project root."
(s-join "-"
(list
(->> project-root
(s-replace-all '(("/" . "-") ("." . "")))
(s-chop-suffix "-")
(s-chop-prefix "-"))
(s-concat debug-provider-name "Docker"))))
(defun dap-docker--dockerize-start-file-args (conf project-config project-root)
"Add container launching and path mapping wrappers to start arguments"
(let* ((provider-name (plist-get conf :type))
(original-launch-command (if (listp (plist-get conf :dap-server-path))
(s-join " " (plist-get conf :dap-server-path))
(plist-get conf :dap-server-path)))
(original-name (plist-get conf :name))
(launch-command (or (dap-docker--get-launch-command project-config) original-launch-command))
(path-mappings (dap-docker--get-path-mappings project-config project-root))
(server-type (car (dap-docker--check-server-type-subtype dap-docker-supported-server-types-subtypes (dap-docker--get-server-type-subtype project-config))))
(server-subtype (cdr (dap-docker--check-server-type-subtype dap-docker-supported-server-types-subtypes (dap-docker--get-server-type-subtype project-config))))
(container-name (dap-docker--get-server-container-name project-config))
(image-name (dap-docker--get-server-image-name project-config)))
(cond ((equal server-subtype 'container)
(-> conf
(plist-put :dap-server-path (s-split " " (dap-docker--prepare-container-start-path container-name path-mappings launch-command)))
(plist-put :name (s-concat original-name "DockerContainer"))
(plist-put :path-mappings path-mappings)
(plist-put :local-to-remote-path-fn (-partial #'dap--local-to-remote-path path-mappings))
(plist-put :remote-to-local-path-fn (-partial #'dap--remote-to-local-path path-mappings))))
((equal server-subtype 'image)
(-> conf
(plist-put :dap-server-path (s-split " " (dap-docker--prepare-image-start-path image-name path-mappings launch-command)))
(plist-put :name (s-concat original-name "DockerImage"))
(plist-put :path-mappings path-mappings)
(plist-put :local-to-remote-path-fn (-partial #'dap--local-to-remote-path path-mappings))
(plist-put :remote-to-local-path-fn (-partial #'dap--remote-to-local-path path-mappings)))))))
(defun dap-docker--dockerize-debug-provider (debug-provider-name project-config project-root)
"Make a particular debug provider docker-aware in a project folder"
(-if-let* ((original-debug-provider (gethash debug-provider-name dap--debug-providers)))
(dap-register-debug-provider (dap-docker--get-dockerized-debug-provider-name debug-provider-name project-root)
`(lambda (conf)
(funcall #'dap-docker--dockerize-start-file-args (funcall (quote ,original-debug-provider) conf) ,project-config ,project-root)))))
(defun dap-docker--dockerize-debug-template (debug-template-name project-config project-root)
"Make a particular debug template docker-aware in a project folder"
(-if-let* ((original-debug-template (--first (let* ((key (-first-item it))
(properties (-slice it 1))
(name (plist-get properties :name))
(type (plist-get properties :type)))
(equal name debug-template-name))
dap-debug-template-configurations)))
(let* ((key (-first-item original-debug-template))
(properties (-slice original-debug-template 1))
(name (plist-get properties :name)))
(dap-register-debug-template
(s-concat key ": Dockerized")
(-> (copy-sequence properties)
(plist-put :type (dap-docker--get-dockerized-debug-provider-name (dap-docker--get-debug-provider-name project-config) project-root))
(plist-put :name (s-concat name "Dockerized")))))))
(defun dap-docker-register ()
"Make the current project debugger docker-aware"
(interactive)
(-if-let* ((config (lsp-docker-get-config-from-lsp))
(project-root (lsp-workspace-root))
(original-provider-name (dap-docker--get-debug-provider-name config))
(original-template-name (dap-docker--get-debug-template-name config))
(containerized-debugging-enabled (dap-docker--is-enabled? config)))
(progn
(dap-docker--dockerize-debug-provider original-provider-name config project-root)
(dap-docker--dockerize-debug-template original-template-name config project-root))
(user-error "Containerized debugging is not enabled or the config is invalid!")))
(provide 'dap-docker)
;;; dap-docker.el ends here