[PATCH 2/5] extras/exec_cgi: remove kgio dependency

[Eric Wong <e@80x24.org>]

We don't need non-blocking I/O at all in this module and it's
not coupled with the rest of yahns at all.
---
 extras/exec_cgi.rb | 46 ++++++++++++++++++++++++++++++----------------
 1 file changed, 30 insertions(+), 16 deletions(-)

diff --git a/extras/exec_cgi.rb b/extras/exec_cgi.rb
index b546e1f..7fb5138 100644
--- a/extras/exec_cgi.rb
+++ b/extras/exec_cgi.rb
@@ -21,18 +21,29 @@
 #   run ExecCgi.new('/path/to/cgit.cgi') # cgit: https://git.zx2c4.com/cgit/
 #
 class ExecCgi
-  class MyIO < Kgio::Pipe
+  class MyIO
     attr_writer :my_pid
     attr_writer :body_tip
+    attr_reader :rd
+
+    def initialize(rd)
+      @rd = rd
+    end
 
     def each
       buf = @body_tip || ''.dup
       if buf.size > 0
         yield buf
       end
-      while tmp = kgio_read(8192, buf)
+
+      case tmp = @rd.read_nonblock(8192, buf, exception: false)
+      when :wait_readable
+        @rd.wait_readable
+      when nil
+        break
+      else # String
         yield tmp
-      end
+      end while true
       self
     ensure
       # do this sooner, since the response body may be buffered, we want
@@ -46,8 +57,8 @@ def close
       # Note: this object (and any client-specific objects) will never
       # be shared across different threads, so we do not need extra
       # mutual exclusion here.
-      return if closed?
-      super
+      return if @rd.closed?
+      @rd.close
       begin
         Process.waitpid(@my_pid)
       rescue Errno::ECHILD
@@ -90,20 +101,23 @@ def call(env)
     cgi_env = { "GATEWAY_INTERFACE" => "CGI/1.1" }
     PASS_VARS.each { |key| val = env[key] and cgi_env[key] = val }
     env.each { |key,val| cgi_env[key] = val if key =~ /\AHTTP_/ }
-    pipe = MyIO.pipe
-    errbody = pipe[0]
-    errbody.my_pid = Process.spawn(cgi_env.merge!(@env), *@args,
-                                   out: pipe[1], close_others: true)
-    pipe[1].close
-    pipe = pipe[0]
 
-    if head = pipe.kgio_read(8192)
+    rd, wr = IO.pipe
+    io = MyIO.new(rd)
+    errbody = io
+    errbody.my_pid = spawn(cgi_env.merge!(@env), *@args,
+                           out: wr, close_others: true)
+    wr.close
+
+    begin
+      head = rd.readpartial(8192)
       until head =~ /\r?\n\r?\n/
-        tmp = pipe.kgio_read(8192) or break
+        tmp = rd.readpartial(8192)
         head << tmp
+        tmp.clear
       end
       head, body = head.split(/\r?\n\r?\n/, 2)
-      pipe.body_tip = body
+      io.body_tip = body
 
       env["HTTP_VERSION"] ||= "HTTP/1.0" # stop Rack::Chunked for HTTP/0.9
 
@@ -117,8 +131,8 @@ def call(env)
       end
       status = headers.delete("Status") || 200
       errbody = nil
-      [ status, headers, pipe ]
-    else
+      [ status, headers, io ]
+    rescue EOFError
       [ 500, { "Content-Length" => "0", "Content-Type" => "text/plain" }, [] ]
     end
   ensure
-- 
EW