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gptel-curl.el
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;;; gptel-curl.el --- Curl support for GPTel -*- lexical-binding: t; -*-
;; Copyright (C) 2023 Karthik Chikmagalur
;; Author: Karthik Chikmagalur;; <[email protected]>
;; Keywords: convenience
;; SPDX-License-Identifier: GPL-3.0-or-later
;; 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:
;; Curl support for GPTel. Utility functions.
;;; Code:
(require 'gptel)
(eval-when-compile
(require 'cl-lib)
(require 'subr-x))
(require 'map)
(require 'json)
(defconst gptel-curl--common-args
(if (memq system-type '(windows-nt ms-dos))
'("--disable" "--location" "--silent" "-XPOST"
"-y300" "-Y1" "-D-")
'("--disable" "--location" "--silent" "--compressed"
"-XPOST" "-y300" "-Y1" "-D-"))
"Arguments always passed to Curl for gptel queries.")
(defvar gptel-curl--process-alist nil
"Alist of active GPTel curl requests.")
(defun gptel-curl--get-args (prompts token)
"Produce list of arguments for calling Curl.
PROMPTS is the data to send, TOKEN is a unique identifier."
(let* ((url (let ((backend-url (gptel-backend-url gptel-backend)))
(if (functionp backend-url)
(funcall backend-url) backend-url)))
(data (encode-coding-string
(json-encode (gptel--request-data gptel-backend prompts))
'utf-8))
(headers
(append '(("Content-Type" . "application/json"))
(when-let ((header (gptel-backend-header gptel-backend)))
(if (functionp header)
(funcall header) header)))))
(when gptel-log-level
(when (eq gptel-log-level 'debug)
(gptel--log (json-encode headers) "request headers"))
(gptel--log data "request body"))
(append
gptel-curl--common-args
(list (format "-w(%s . %%{size_header})" token))
(if (length< data gptel-curl-file-size-threshold)
(list (format "-d%s" data))
(letrec
((temp-filename (make-temp-file "gptel-curl-data" nil ".json" data))
(cleanup-fn (lambda (&rest _)
(when (file-exists-p temp-filename)
(delete-file temp-filename)
(remove-hook 'gptel-post-response-functions cleanup-fn)))))
(add-hook 'gptel-post-response-functions cleanup-fn)
(list "--data-binary"
(format "@%s" temp-filename))))
(when (not (string-empty-p gptel-proxy))
(list "--proxy" gptel-proxy
"--proxy-negotiate"
"--proxy-user" ":"))
(cl-loop for (key . val) in headers
collect (format "-H%s: %s" key val))
(list url))))
;;TODO: The :transformer argument here is an alternate implementation of
;;`gptel-response-filter-functions'. The two need to be unified.
;;;###autoload
(defun gptel-curl-get-response (info &optional callback)
"Retrieve response to prompt in INFO.
INFO is a plist with the following keys:
- :prompt (the prompt being sent)
- :buffer (the gptel buffer)
- :position (marker at which to insert the response).
Call CALLBACK with the response and INFO afterwards. If omitted
the response is inserted into the current buffer after point."
(let* ((token (md5 (format "%s%s%s%s"
(random) (emacs-pid) (user-full-name)
(recent-keys))))
(args (gptel-curl--get-args (plist-get info :prompt) token))
(stream (and gptel-stream (gptel-backend-stream gptel-backend)))
(process (apply #'start-process "gptel-curl"
(generate-new-buffer "*gptel-curl*") "curl" args)))
(when (eq gptel-log-level 'debug)
(gptel--log (json-encode (cons "curl" args))
"request Curl command"))
(with-current-buffer (process-buffer process)
(set-process-query-on-exit-flag process nil)
(setf (alist-get process gptel-curl--process-alist)
(nconc (list :token token
;; FIXME `aref' breaks `cl-struct' abstraction boundary
;; FIXME `cl--generic-method' is an internal `cl-struct'
:parser (cl--generic-method-function
(if stream
(cl-find-method
'gptel-curl--parse-stream nil
(list
(aref (buffer-local-value
'gptel-backend (plist-get info :buffer))
0) t))
(cl-find-method
'gptel--parse-response nil
(list
(aref (buffer-local-value
'gptel-backend (plist-get info :buffer))
0) t t))))
:callback (or callback
(if stream
#'gptel-curl--stream-insert-response
#'gptel--insert-response))
:transformer (when (eq (buffer-local-value
'major-mode
(plist-get info :buffer))
'org-mode)
(gptel--stream-convert-markdown->org)))
info))
(if stream
(progn (set-process-sentinel process #'gptel-curl--stream-cleanup)
(set-process-filter process #'gptel-curl--stream-filter))
(set-process-sentinel process #'gptel-curl--sentinel)))))
(defun gptel-curl--log-response (proc-buf proc-info)
"Parse response buffer PROC-BUF and log response.
PROC-INFO is the plist containing process metadata."
(with-current-buffer proc-buf
(save-excursion
(goto-char (point-min))
(when (re-search-forward "?\n?\n" nil t)
(when (eq gptel-log-level 'debug)
(gptel--log (json-encode-string
(buffer-substring-no-properties
(point-min) (1- (point))))
"response headers"))
(let ((p (point)))
(when (search-forward (plist-get proc-info :token) nil t)
(goto-char (1- (match-beginning 0)))
(gptel--log (buffer-substring-no-properties p (point))
"response body")))))))
(defun gptel-abort (buf)
"Stop any active gptel process associated with buffer BUF."
(interactive (list (current-buffer)))
(unless gptel-use-curl
(user-error "Cannot stop a `url-retrieve' request!"))
(if-let* ((proc-attrs
(cl-find-if
(lambda (proc-list)
(eq (plist-get (cdr proc-list) :buffer) buf))
gptel-curl--process-alist))
(proc (car proc-attrs)))
(progn
(setf (alist-get proc gptel-curl--process-alist nil 'remove) nil)
(set-process-sentinel proc #'ignore)
(delete-process proc)
(kill-buffer (process-buffer proc))
(with-current-buffer buf
(when gptel-mode (gptel--update-status " Ready" 'success)))
(message "Stopped gptel request in buffer %S" (buffer-name buf)))
(message "No gptel request associated with buffer %S" (buffer-name buf))))
;; TODO: Separate user-messaging from this function
(defun gptel-curl--stream-cleanup (process _status)
"Process sentinel for GPTel curl requests.
PROCESS and _STATUS are process parameters."
(let ((proc-buf (process-buffer process)))
(let* ((info (alist-get process gptel-curl--process-alist))
(gptel-buffer (plist-get info :buffer))
(backend-name
(gptel-backend-name
(buffer-local-value 'gptel-backend gptel-buffer)))
(tracking-marker (plist-get info :tracking-marker))
(start-marker (plist-get info :position))
(http-status (plist-get info :http-status))
(http-msg (plist-get info :status))
response-beg response-end)
(when gptel-log-level (gptel-curl--log-response proc-buf info)) ;logging
(if (equal http-status "200")
(progn
;; Finish handling response
(with-current-buffer (marker-buffer start-marker)
(setq response-beg (+ start-marker 2)
response-end (marker-position tracking-marker))
(pulse-momentary-highlight-region response-beg tracking-marker)
(when gptel-mode (save-excursion (goto-char tracking-marker)
(insert "\n\n" (gptel-prompt-prefix-string)))))
(with-current-buffer gptel-buffer
(when gptel-mode (gptel--update-status " Ready" 'success))))
;; Or Capture error message
(with-current-buffer proc-buf
(goto-char (point-max))
(search-backward (plist-get info :token))
(backward-char)
(pcase-let* ((`(,_ . ,header-size) (read (current-buffer)))
(json-object-type 'plist)
(response (progn (goto-char header-size)
(condition-case nil (json-read)
(json-readtable-error 'json-read-error))))
(error-data (plist-get response :error)))
(cond
(error-data
(if (stringp error-data)
(message "%s error: (%s) %s" backend-name http-msg error-data)
(when-let ((error-msg (plist-get error-data :message)))
(message "%s error: (%s) %s" backend-name http-msg error-msg))
(when-let ((error-type (plist-get error-data :type)))
(setq http-msg (concat "(" http-msg ") " (string-trim error-type))))))
((eq response 'json-read-error)
(message "%s error (%s): Malformed JSON in response." backend-name http-msg))
(t (message "%s error (%s): Could not parse HTTP response." backend-name http-msg)))))
(with-current-buffer gptel-buffer
(when gptel-mode
(gptel--update-status
(format " Response Error: %s" http-msg) 'error))))
(with-current-buffer gptel-buffer
(run-hook-with-args 'gptel-post-response-functions response-beg response-end)))
(setf (alist-get process gptel-curl--process-alist nil 'remove) nil)
(kill-buffer proc-buf)))
(defun gptel-curl--stream-insert-response (response info)
"Insert streaming RESPONSE from an LLM into the gptel buffer.
INFO is a mutable plist containing information relevant to this buffer.
See `gptel--url-get-response' for details."
(let ((start-marker (plist-get info :position))
(tracking-marker (plist-get info :tracking-marker))
(transformer (plist-get info :transformer)))
(when response
(with-current-buffer (marker-buffer start-marker)
(save-excursion
(unless tracking-marker
(gptel--update-status " Typing..." 'success)
(goto-char start-marker)
(unless (or (bobp) (plist-get info :in-place))
(insert "\n\n")
(when gptel-mode
;; Put prefix before AI response.
(insert (gptel-response-prefix-string))))
(setq tracking-marker (set-marker (make-marker) (point)))
(set-marker-insertion-type tracking-marker t)
(plist-put info :tracking-marker tracking-marker))
(when transformer
(setq response (funcall transformer response)))
(add-text-properties
0 (length response) '(gptel response rear-nonsticky t)
response)
(goto-char tracking-marker)
;; (run-hooks 'gptel-pre-stream-hook)
(insert response)
(run-hooks 'gptel-post-stream-hook))))))
(defun gptel-curl--stream-filter (process output)
(let* ((proc-info (alist-get process gptel-curl--process-alist)))
(with-current-buffer (process-buffer process)
;; Insert output
(save-excursion
(goto-char (process-mark process))
(insert output)
(set-marker (process-mark process) (point)))
;; Find HTTP status
(unless (plist-get proc-info :http-status)
(save-excursion
(goto-char (point-min))
(when-let* (((not (= (line-end-position) (point-max))))
(http-msg (buffer-substring (line-beginning-position)
(line-end-position)))
(http-status
(save-match-data
(and (string-match "HTTP/[.0-9]+ +\\([0-9]+\\)" http-msg)
(match-string 1 http-msg)))))
(plist-put proc-info :http-status http-status)
(plist-put proc-info :status (string-trim http-msg))))
;; Handle read-only gptel buffer
(when (with-current-buffer (plist-get proc-info :buffer)
(or buffer-read-only
(get-char-property (plist-get proc-info :position) 'read-only)))
(message "Buffer is read only, displaying reply in buffer \"*LLM response*\"")
(display-buffer
(with-current-buffer (get-buffer-create "*LLM response*")
(visual-line-mode 1)
(goto-char (point-max))
(move-marker (plist-get proc-info :position) (point) (current-buffer))
(current-buffer))
'((display-buffer-reuse-window
display-buffer-pop-up-window)
(reusable-frames . visible))))
;; Run pre-response hook
(when (and (equal (plist-get proc-info :http-status) "200")
gptel-pre-response-hook)
(with-current-buffer (marker-buffer (plist-get proc-info :position))
(run-hooks 'gptel-pre-response-hook))))
(when-let ((http-msg (plist-get proc-info :status))
(http-status (plist-get proc-info :http-status)))
;; Find data chunk(s) and run callback
(when-let (((equal http-status "200"))
(response (funcall (plist-get proc-info :parser) nil proc-info))
((not (equal response ""))))
(funcall (or (plist-get proc-info :callback)
#'gptel-curl--stream-insert-response)
response proc-info))))))
(cl-defgeneric gptel-curl--parse-stream (backend proc-info)
"Stream parser for gptel-curl.
Implementations of this function run as part of the process
filter for the active query, and return partial responses from
the LLM.
BACKEND is the LLM backend in use.
PROC-INFO is a plist with process information and other context.
See `gptel-curl--get-response' for its contents.")
(defun gptel-curl--sentinel (process _status)
"Process sentinel for gptel curl requests.
PROCESS and _STATUS are process parameters."
(let ((proc-buf (process-buffer process)))
(when-let* (((eq (process-status process) 'exit))
(proc-info (alist-get process gptel-curl--process-alist))
(proc-callback (plist-get proc-info :callback)))
(when gptel-log-level (gptel-curl--log-response proc-buf proc-info)) ;logging
(pcase-let ((`(,response ,http-msg ,error)
(with-current-buffer proc-buf
(gptel-curl--parse-response proc-info))))
(plist-put proc-info :status http-msg)
(when error (plist-put proc-info :error error))
(funcall proc-callback response proc-info)))
(setf (alist-get process gptel-curl--process-alist nil 'remove) nil)
(kill-buffer proc-buf)))
(defun gptel-curl--parse-response (proc-info)
"Parse the buffer BUF with curl's response.
PROC-INFO is a plist with contextual information."
(let ((token (plist-get proc-info :token))
(parser (plist-get proc-info :parser)))
(goto-char (point-max))
(search-backward token)
(backward-char)
(pcase-let* ((`(,_ . ,header-size) (read (current-buffer))))
(goto-char (point-min))
(if-let* ((http-msg (string-trim
(buffer-substring (line-beginning-position)
(line-end-position))))
(http-status
(save-match-data
(and (string-match "HTTP/[.0-9]+ +\\([0-9]+\\)" http-msg)
(match-string 1 http-msg))))
(json-object-type 'plist)
(response (progn (goto-char header-size)
(condition-case nil
(json-read)
(json-readtable-error 'json-read-error)))))
(cond
((equal http-status "200")
(list (string-trim
(funcall parser nil response proc-info))
http-msg))
((plist-get response :error)
(let* ((error-data (plist-get response :error))
(error-msg (plist-get error-data :message))
(error-type (plist-get error-data :type))
(backend-name
(gptel-backend-name
(buffer-local-value 'gptel-backend (plist-get proc-info :buffer)))))
(if (stringp error-data)
(progn (message "%s error: (%s) %s" backend-name http-msg error-data)
(setq error-msg (string-trim error-data)))
(when (stringp error-msg)
(message "%s error: (%s) %s" backend-name http-msg (string-trim error-msg)))
(when error-type (setq http-msg (concat "(" http-msg ") " (string-trim error-type)))))
(list nil (concat "(" http-msg ") " (or error-msg "")))))
((eq response 'json-read-error)
(list nil (concat "(" http-msg ") Malformed JSON in response.")
"Malformed JSON in response"))
(t (list nil (concat "(" http-msg ") Could not parse HTTP response.")
"Could not parse HTTP response.")))
(list nil (concat "(" http-msg ") Could not parse HTTP response.")
"Could not parse HTTP response.")))))
(provide 'gptel-curl)
;;; gptel-curl.el ends here