From 544a38dd45f6a58d34296c6c768afd086eb2ac70 Mon Sep 17 00:00:00 2001
From: Christopher Lenz <cmlenz@apache.org>
Date: Fri, 28 Mar 2008 23:32:19 +0000
Subject: Imported trunk.

git-svn-id: https://svn.apache.org/repos/asf/incubator/couchdb/trunk@642432 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couch_inets/mod_get.erl | 125 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 src/couch_inets/mod_get.erl

(limited to 'src/couch_inets/mod_get.erl')

diff --git a/src/couch_inets/mod_get.erl b/src/couch_inets/mod_get.erl
new file mode 100644
index 00000000..b3c59875
--- /dev/null
+++ b/src/couch_inets/mod_get.erl
@@ -0,0 +1,125 @@
+%% ``The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved via the world wide web at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%% 
+%%     $Id$
+%%
+-module(mod_get).
+-export([do/1]).
+-include("httpd.hrl").
+
+%% do
+
+do(Info) ->
+    ?DEBUG("do -> entry",[]),
+    case Info#mod.method of
+	"GET" ->
+	    case httpd_util:key1search(Info#mod.data,status) of
+		%% A status code has been generated!
+		{_StatusCode, _PhraseArgs, _Reason} ->
+		    {proceed,Info#mod.data};
+		%% No status code has been generated!
+		undefined ->
+		    case httpd_util:key1search(Info#mod.data,response) of
+			%% No response has been generated!
+			undefined ->
+			    do_get(Info);
+			%% A response has been generated or sent!
+			_Response ->
+			    {proceed,Info#mod.data}
+		    end
+	    end;
+	%% Not a GET method!
+	_ ->
+	    {proceed,Info#mod.data}
+    end.
+
+
+do_get(Info) ->
+    ?DEBUG("do_get -> Request URI: ~p",[Info#mod.request_uri]),
+    Path = mod_alias:path(Info#mod.data, Info#mod.config_db, 
+			  Info#mod.request_uri),
+    {FileInfo, LastModified} = get_modification_date(Path),
+
+    send_response(Info#mod.socket,Info#mod.socket_type, Path, Info, 
+		  FileInfo, LastModified).
+
+
+%% The common case when no range is specified
+send_response(_Socket, _SocketType, Path, Info, FileInfo, LastModified)->
+    %% Send the file!
+    %% Find the modification date of the file
+    case file:open(Path,[raw,binary]) of
+	{ok, FileDescriptor} ->
+	    ?DEBUG("do_get -> FileDescriptor: ~p",[FileDescriptor]),
+	    Suffix = httpd_util:suffix(Path),
+	    MimeType = httpd_util:lookup_mime_default(Info#mod.config_db,
+						      Suffix,"text/plain"),
+	    %% FileInfo = file:read_file_info(Path),
+	    Size = integer_to_list(FileInfo#file_info.size),
+	    Headers = case Info#mod.http_version of
+			 "HTTP/1.1" ->
+			      [{content_type, MimeType},
+			       {etag, httpd_util:create_etag(FileInfo)},
+			       {content_length, Size}|LastModified];
+			  %% OTP-4935
+			 _ ->
+			     %% i.e http/1.0 and http/0.9
+			      [{content_type, MimeType},
+			       {content_length, Size}|LastModified]
+			  end,
+	    send(Info, 200, Headers, FileDescriptor),
+	    file:close(FileDescriptor),
+	    {proceed,[{response,{already_sent,200,
+				 FileInfo#file_info.size}},
+		      {mime_type,MimeType}|Info#mod.data]};
+	{error, Reason} ->
+	    Status = httpd_file:handle_error(Reason, "open", Info, Path),
+	    {proceed,
+	     [{status, Status}| Info#mod.data]}
+    end.
+
+%% send
+
+send(#mod{socket = Socket, socket_type = SocketType} = Info,
+     StatusCode, Headers, FileDescriptor) ->
+    ?DEBUG("send -> send header",[]),
+    httpd_response:send_header(Info, StatusCode, Headers),
+    send_body(SocketType,Socket,FileDescriptor).
+
+
+send_body(SocketType,Socket,FileDescriptor) ->
+    case file:read(FileDescriptor,?FILE_CHUNK_SIZE) of
+	{ok,Binary} ->
+	    ?DEBUG("send_body -> send another chunk: ~p",[size(Binary)]),
+	    case httpd_socket:deliver(SocketType,Socket,Binary) of
+		socket_closed ->
+		    ?LOG("send_body -> socket closed while sending",[]),
+		    socket_close;
+		_ ->
+		    send_body(SocketType,Socket,FileDescriptor)
+	    end;
+	eof ->
+	    ?DEBUG("send_body -> done with this file",[]),
+	    eof
+    end.
+
+get_modification_date(Path)->
+    {ok, FileInfo0} = file:read_file_info(Path), 
+    LastModified = 
+	case catch httpd_util:rfc1123_date(FileInfo0#file_info.mtime) of
+	    Date when is_list(Date) -> [{last_modified, Date}];
+	    _ -> []
+	end,
+    {FileInfo0, LastModified}.
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