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;; SPDX-License-Identifier: EUPL-1.2
;; SPDX-FileCopyrightText: 2025 Uko Kokņevičs <perkontevs@gmail.com>
(defpackage :ukkoclot/src/transport
(:documentation "Package dealing with HTTP calls.")
(:use :c2cl)
(:import-from :cl+ssl)
(:import-from :dex)
(:import-from :log)
(:import-from :serapeum :->)
(:import-from :state :base-uri)
(:import-from :ukkoclot/src/serializing :fixup-args :parse-value)
(:local-nicknames
(:jzon :com.inuoe.jzon))
(:export :do-call :http-method))
(in-package :ukkoclot/src/transport)
;; Yes I know there are more, these are all I care about though
(deftype http-method ()
'(member :GET :POST))
;; TODO: Better type for the list, it's an alist of string to t
(-> req (string http-method list) (or string null))
(defun req (uri method content)
"Wrapper function for making a request."
(let ((retrier (dex:retry-request 5 :interval 1))
;; This is needed to avoid hangs,
;; see https://github.com/fukamachi/dexador/issues/91#issuecomment-1093472364
(cl+ssl:*default-unwrap-stream-p* nil))
(handler-case (dex:request uri :method method :content content :read-timeout 60 :connect-timeout 60)
;; We deal with too many requests manually
(dex:http-request-too-many-requests (e) (dex:ignore-and-continue e))
(dex:http-request-failed (e) (funcall retrier e))
(cl+ssl::ssl-error (e) (funcall retrier e)))))
;; TODO: (alist string t)
(-> do-call% (http-method string t list) t)
(defun do-call% (method uri out-type args-encoded)
"Internal function with the arguments already encoded.
See `do-call'."
(let* ((body (req uri method args-encoded))
(hash (jzon:parse body)))
(if (gethash "ok" hash)
(parse-value out-type (gethash "result" hash))
(let* ((error-code (gethash "error_code" hash))
(description (gethash "description" hash))
(parameters (gethash "parameters" hash))
(retry-after (when parameters (gethash "retry_after" parameters))))
(cond
(retry-after
(log:info "Should sleep for ~A seconds" retry-after)
(sleep retry-after)
(log:info "Good morning!")
(do-call% method uri out-type args-encoded))
(t
(error "TG error ~A: ~A ~:A"
error-code description parameters)))))))
;; TODO: (alist t t)
(-> do-call (http-method string t list) t)
(defun do-call (method path out-type args)
"Perform a HTTP call."
(let ((uri (concatenate 'string (base-uri) path))
(args-encoded (fixup-args args)))
(log:debug "~A .../~A ~S" method path args-encoded)
(do-call% method uri out-type args-encoded)))
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