From 595eb2739742b30be21197a3c059eccb08e9926b Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Thu, 30 Jun 2022 11:05:41 +0530
Subject: bin: Introduce listen specification for web service.

The new listen specification unifies unix sockets, IP addresses and
ports, all into one string.

* bin/tissue (address->socket-address): Delete function.
(listen->socket-address): New function.
(tissue-run-web): Use listen->socket-address instead of
address->socket-address. Specify default listen instead of default
address and port.
---
 bin/tissue | 40 +++++++++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 17 deletions(-)

diff --git a/bin/tissue b/bin/tissue
index fb1656e..bf69100 100755
--- a/bin/tissue
+++ b/bin/tissue
@@ -190,22 +190,30 @@ Export the repository as a website to OUTPUT-DIRECTORY.
                       (tissue-configuration-web-css (load-config))
                       (tissue-configuration-web-files (load-config)))))))
 
-(define (address->socket-address address port)
-  "Convert ADDRESS and PORT to a socket address."
+(define (listen->socket-address listen)
+  "Convert LISTEN specification to a socket address."
   (cond
+   ;; Unix socket
+   ((string-prefix? "unix:" listen)
+    (make-socket-address AF_UNIX
+                         (string-remove-prefix "unix:" listen)))
    ;; IPv4
-   ((string-contains address ".")
-    (make-socket-address AF_INET
-                         (inet-pton AF_INET address)
-                         port))
+   ((guard (_ (else #f))
+      (inet-pton AF_INET
+                 (substring listen 0 (string-index-right listen #\:))))
+    => (lambda (ip)
+         (make-socket-address
+          AF_INET ip (string->number
+                      (substring listen (1+ (string-index-right listen #\:)))))))
    ;; IPv6
-   ((string-contains address ":")
-    (make-socket-address AF_INET6
-                         (inet-pton AF_INET6 address)
-                         port))
-   ;; Unix socket
    (else
-    (make-socket-address AF_UNIX address))))
+    (make-socket-address AF_INET6
+                         (inet-pton AF_INET6
+                                    (string-trim-both
+                                     (substring listen 0 (string-index-right listen #\:))
+                                     (char-set #\[ #\])))
+                         (string->number
+                          (substring listen (1+ (string-index-right listen #\:))))))))
 
 (define tissue-run-web
   (match-lambda*
@@ -227,9 +235,8 @@ Run a web search service reading configuration from CONFIG-FILE.
                               (append (call-with-input-file config-file
                                         read)
                                       result))
-                            ;; Default address and port
-                            '((address . "127.0.0.1")
-                              (port . 8080)))))
+                            ;; Default listen
+                            '((listen . "127.0.0.1:8080")))))
        (let ((listen-repl (assq-ref args 'listen-repl)))
          (when listen-repl
            (spawn-server (cond
@@ -243,8 +250,7 @@ Run a web search service reading configuration from CONFIG-FILE.
                                    "REPL server listening on ~a~%"
                                    listen-repl)
                            (make-unix-domain-server-socket #:path listen-repl))))))
-       (start-web-server (address->socket-address (assq-ref args 'address)
-                                                  (assq-ref args 'port))
+       (start-web-server (listen->socket-address (assq-ref args 'listen))
                          %xapian-index
                          (tissue-configuration-web-css (load-config)))))))
 
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