2012-03-03 23:04:52 +00:00
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open Unix
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open Printf
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open Thread
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open Amqp_spec
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2012-03-04 05:12:59 +00:00
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open Amqp_wireformat
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2012-03-03 23:04:52 +00:00
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type connection_t = {
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2012-03-04 17:12:20 +00:00
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peername: Unix.sockaddr;
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2012-03-03 23:04:52 +00:00
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mtx: Mutex.t;
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cin: in_channel;
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cout: out_channel;
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2012-03-04 17:12:20 +00:00
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name: Uuid.t;
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2012-03-03 23:04:52 +00:00
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mutable input_buf: string;
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mutable output_buf: Buffer.t;
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mutable frame_max: int;
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2012-03-04 05:12:59 +00:00
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mutable connection_closed: bool;
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mutable recent_queue_name: string option;
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2012-03-04 17:12:20 +00:00
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mutable delivery_tag: int
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2012-03-03 23:04:52 +00:00
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}
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2012-03-04 17:12:20 +00:00
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let initial_frame_size = frame_min_size
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let suggested_frame_max = 131072
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let amqp_boot (peername, mtx, cin, cout) = {
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peername = peername;
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mtx = mtx;
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cin = cin;
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cout = cout;
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name = Uuid.create ();
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input_buf = String.create initial_frame_size;
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output_buf = Buffer.create initial_frame_size;
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frame_max = initial_frame_size;
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connection_closed = false;
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recent_queue_name = None;
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delivery_tag = 1 (* Not 0: 0 means "all deliveries" in an ack *)
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}
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2012-03-03 23:04:52 +00:00
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let read_frame conn =
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let frame_type = input_byte conn.cin in
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let channel_hi = input_byte conn.cin in
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let channel_lo = input_byte conn.cin in
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let channel = (channel_hi lsr 8) lor channel_lo in
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let length = input_binary_int conn.cin in
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if length > conn.frame_max
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2012-03-04 05:12:59 +00:00
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then die frame_error "Frame longer than current frame_max"
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2012-03-03 23:04:52 +00:00
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else
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(really_input conn.cin conn.input_buf 0 length;
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if input_byte conn.cin <> frame_end
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2012-03-04 05:12:59 +00:00
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then die frame_error "Missing frame_end octet"
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2012-03-03 23:04:52 +00:00
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else (frame_type, channel, length))
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let write_frame conn frame_type channel =
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output_byte conn.cout frame_type;
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output_byte conn.cout ((channel lsr 8) land 255);
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output_byte conn.cout (channel land 255);
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output_binary_int conn.cout (Buffer.length conn.output_buf);
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Buffer.output_buffer conn.cout conn.output_buf;
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Buffer.reset conn.output_buf;
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output_byte conn.cout frame_end
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let serialize_method buf m =
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let (class_id, method_id) = method_index m in
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2012-03-04 05:12:59 +00:00
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write_short buf class_id;
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write_short buf method_id;
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2012-03-03 23:04:52 +00:00
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write_method m buf
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let deserialize_method buf =
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2012-03-04 05:12:59 +00:00
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let class_id = read_short buf in
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let method_id = read_short buf in
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2012-03-03 23:04:52 +00:00
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read_method class_id method_id buf
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let serialize_header buf body_size p =
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let class_id = class_index p in
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2012-03-04 05:12:59 +00:00
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write_short buf class_id;
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write_short buf 0;
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write_longlong buf (Int64.of_int body_size);
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2012-03-03 23:04:52 +00:00
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write_properties p buf
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2012-03-04 05:12:59 +00:00
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let deserialize_header buf =
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let class_id = read_short buf in
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let _ = read_short buf in
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let body_size = Int64.to_int (read_longlong buf) in
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(body_size, read_properties class_id buf)
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2012-03-03 23:04:52 +00:00
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let send_content_body conn channel body =
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let offset = ref 0 in
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let len = String.length body in
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while (!offset) < len do
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let snip_len = min conn.frame_max (len - !offset) in
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Buffer.add_substring conn.output_buf body (!offset) snip_len;
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write_frame conn frame_body channel;
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offset := !offset + snip_len
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done
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2012-03-04 05:12:59 +00:00
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let next_frame conn required_type =
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2012-03-03 23:04:52 +00:00
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let (frame_type, channel, length) = read_frame conn in
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2012-03-04 05:12:59 +00:00
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if frame_type <> required_type
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then die command_invalid (Printf.sprintf "Unexpected frame type %d" frame_type)
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else (channel, length)
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let next_method conn =
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let (channel, length) = next_frame conn frame_method in
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(channel, deserialize_method (Ibuffer.create conn.input_buf 0 length))
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let next_header conn =
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let (channel, length) = next_frame conn frame_header in
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(channel, deserialize_header (Ibuffer.create conn.input_buf 0 length))
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let recv_content_body conn body_size =
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let buf = Buffer.create body_size in
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while Buffer.length buf < body_size do
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let (_, length) = next_frame conn frame_body in
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Buffer.add_substring buf conn.input_buf 0 length
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done;
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Buffer.contents buf
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2012-03-03 23:04:52 +00:00
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let with_conn_mutex conn thunk = Util.with_mutex0 conn.mtx thunk
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2012-03-04 05:12:59 +00:00
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let send_method conn channel m =
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2012-03-03 23:04:52 +00:00
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with_conn_mutex conn (fun () ->
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serialize_method conn.output_buf m;
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2012-03-04 05:12:59 +00:00
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write_frame conn frame_method channel;
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2012-03-03 23:04:52 +00:00
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flush conn.cout)
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2012-03-04 17:12:20 +00:00
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let send_content_method conn channel m p body_str =
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with_conn_mutex conn (fun () ->
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serialize_method conn.output_buf m;
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write_frame conn frame_method 1;
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serialize_header conn.output_buf (String.length body_str) p;
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write_frame conn frame_header 1;
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send_content_body conn 1 body_str;
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flush conn.cout)
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2012-03-03 23:04:52 +00:00
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let send_error conn code message =
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if conn.connection_closed
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then
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()
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else
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2012-03-04 17:12:20 +00:00
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conn.connection_closed <- true;
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2012-03-03 23:04:52 +00:00
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let m = Connection_close (code, message, 0, 0) in
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Log.warn "Sending error" [sexp_of_method m];
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2012-03-04 05:12:59 +00:00
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send_method conn 0 m
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2012-03-03 23:04:52 +00:00
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2012-03-04 17:12:20 +00:00
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let send_warning conn code message =
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let m = Channel_close (code, message, 0, 0) in
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Log.warn "Sending warning" [sexp_of_method m];
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send_method conn 1 m
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2012-03-03 23:04:52 +00:00
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let issue_banner cin cout =
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let handshake = String.create 8 in
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try
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really_input cin handshake 0 8;
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if String.sub handshake 0 4 <> "AMQP"
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then (output_string cout "AMQP\000\000\009\001"; false)
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else true
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with End_of_file -> false
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2012-03-05 21:55:14 +00:00
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let reference_to_logs = "See server logs for details"
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let extract_str v =
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match v with
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| Sexp.Str s -> s
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| _ -> reference_to_logs
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2012-03-04 17:12:20 +00:00
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let reply_to_declaration conn status ok_fn =
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match Message.message_of_sexp status with
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| Message.Create_ok info ->
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send_method conn 1 (ok_fn info)
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| Message.Create_failed reason ->
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(match reason with
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2012-03-05 21:55:14 +00:00
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| Sexp.Arr [Sexp.Str "factory"; Sexp.Str "class-not-found"] ->
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send_error conn command_invalid "Object type not supported by server"
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| Sexp.Arr [Sexp.Str "constructor"; Sexp.Str "class-mismatch"] ->
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send_error conn not_allowed "Redeclaration with different object type not permitted"
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| Sexp.Arr [Sexp.Str who; explanation] ->
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send_warning conn precondition_failed (who^" failed: "^(extract_str explanation))
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| _ ->
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send_warning conn precondition_failed reference_to_logs)
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2012-03-04 17:12:20 +00:00
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| _ -> die internal_error "Declare reply malformed"
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let make_queue_declare_ok info =
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match info with
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| Sexp.Str queue_name -> Queue_declare_ok (queue_name, Int32.zero, Int32.zero)
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| _ -> die internal_error "Unusable queue name in declare response"
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let send_delivery conn consumer_tag body_sexp =
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match body_sexp with
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| Sexp.Hint {Sexp.hint = Sexp.Str "amqp";
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Sexp.body = Sexp.Arr [Sexp.Str exchange;
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Sexp.Str routing_key;
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properties_sexp;
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Sexp.Str body_str]} ->
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let tag = with_conn_mutex conn (fun () ->
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let v = conn.delivery_tag in conn.delivery_tag <- v + 1; v)
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in
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send_content_method conn 1
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(Basic_deliver (consumer_tag, Int64.of_int tag, false, exchange, routing_key))
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(properties_of_sexp basic_class_id properties_sexp)
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body_str
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| _ -> die internal_error "Malformed AMQP message body sexp"
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let amqp_handler conn n m_sexp =
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try
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(match Message.message_of_sexp m_sexp with
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| Message.Post (Sexp.Str "Exchange_declare_reply", status, _) ->
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reply_to_declaration conn status (fun (_) -> Exchange_declare_ok)
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| Message.Post (Sexp.Str "Queue_declare_reply", status, _) ->
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reply_to_declaration conn status make_queue_declare_ok
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| Message.Post (Sexp.Str "Queue_bind_reply", status, _) ->
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(match Message.message_of_sexp status with
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| Message.Subscribe_ok _ -> send_method conn 1 Queue_bind_ok
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| _ -> die internal_error "Queue bind reply malformed")
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| Message.Post (Sexp.Arr [Sexp.Str "Basic_consume_reply"; Sexp.Str consumer_tag], status, _) ->
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(match Message.message_of_sexp status with
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| Message.Subscribe_ok _ -> send_method conn 1 (Basic_consume_ok consumer_tag)
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| _ -> die internal_error "Basic consume reply malformed")
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| Message.Post (Sexp.Arr [Sexp.Str "delivery"; Sexp.Str consumer_tag], body, _) ->
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send_delivery conn consumer_tag body
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| _ ->
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Log.warn "AMQP outbound relay ignoring message" [m_sexp])
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with
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| Amqp_exception (code, message) ->
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send_error conn code message
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| exn ->
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send_error conn internal_error "";
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raise exn
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2012-03-03 23:04:52 +00:00
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2012-03-04 05:12:59 +00:00
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let get_recent_queue_name conn =
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match conn.recent_queue_name with
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| Some q -> q
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| None -> die syntax_error "Attempt to use nonexistent most-recently-declared-queue name"
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let expand_mrdq conn queue =
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match queue with
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| "" -> get_recent_queue_name conn
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| other -> other
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let handle_method conn channel m =
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if channel > 1 then die channel_error "Unsupported channel number" else ();
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2012-03-03 23:04:52 +00:00
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match m with
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2012-03-04 05:12:59 +00:00
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| Connection_close (code, text, _, _) ->
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Log.info "Client closed AMQP connection" [Sexp.Str (string_of_int code); Sexp.Str text];
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send_method conn channel Connection_close_ok;
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conn.connection_closed <- true
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2012-03-04 17:12:20 +00:00
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| Channel_open ->
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conn.delivery_tag <- 1;
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send_method conn channel Channel_open_ok
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2012-03-04 05:12:59 +00:00
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| Channel_close (code, text, _, _) ->
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Log.info "Client closed AMQP channel" [Sexp.Str (string_of_int code); Sexp.Str text];
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send_method conn channel Channel_close_ok;
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| Exchange_declare (exchange, type_, passive, durable, no_wait, arguments) ->
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2012-03-04 17:12:20 +00:00
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Node.send_ignore "factory" (Message.create (Sexp.Str type_,
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Sexp.Arr [Sexp.Str exchange],
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Sexp.Str conn.name,
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Sexp.Str "Exchange_declare_reply"))
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2012-03-04 05:12:59 +00:00
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| Queue_declare (queue, passive, durable, exclusive, auto_delete, no_wait, arguments) ->
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let queue = (if queue = "" then Uuid.create () else queue) in
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conn.recent_queue_name <- Some queue;
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2012-03-04 17:12:20 +00:00
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Node.send_ignore "factory" (Message.create (Sexp.Str "queue",
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Sexp.Arr [Sexp.Str queue],
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Sexp.Str conn.name,
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Sexp.Str "Queue_declare_reply"))
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2012-03-04 05:12:59 +00:00
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| Queue_bind (queue, exchange, routing_key, no_wait, arguments) ->
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let queue = expand_mrdq conn queue in
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2012-03-04 17:12:20 +00:00
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if not (Node.exists queue)
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2012-03-04 18:03:08 +00:00
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then send_warning conn not_found ("Queue "^queue^" not found")
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2012-03-04 17:12:20 +00:00
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else
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if Node.send exchange (Message.subscribe (Sexp.Str routing_key,
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Sexp.Str queue,
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Sexp.Str "",
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Sexp.Str conn.name,
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Sexp.Str "Queue_bind_reply"))
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then ()
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2012-03-04 18:03:08 +00:00
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else send_warning conn not_found ("Exchange "^exchange^" not found")
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2012-03-04 05:12:59 +00:00
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| Basic_consume (queue, consumer_tag, no_local, no_ack, exclusive, no_wait, arguments) ->
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let queue = expand_mrdq conn queue in
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2012-03-04 17:12:20 +00:00
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let consumer_tag = (if consumer_tag = "" then Uuid.create () else consumer_tag) in
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if Node.send queue (Message.subscribe
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(Sexp.Str "",
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Sexp.Str conn.name,
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Sexp.Arr [Sexp.Str "delivery"; Sexp.Str consumer_tag],
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Sexp.Str conn.name,
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Sexp.Arr [Sexp.Str "Basic_consume_reply"; Sexp.Str consumer_tag]))
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then ()
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2012-03-04 18:03:08 +00:00
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else send_warning conn not_found ("Queue "^queue^" not found")
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2012-03-04 05:12:59 +00:00
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| Basic_publish (exchange, routing_key, false, false) ->
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let (_, (body_size, properties)) = next_header conn in
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let body = recv_content_body conn body_size in
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2012-03-04 17:12:20 +00:00
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if Node.post exchange
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(Sexp.Str routing_key)
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(Sexp.Hint {Sexp.hint = Sexp.Str "amqp";
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Sexp.body = Sexp.Arr [Sexp.Str exchange;
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Sexp.Str routing_key;
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sexp_of_properties properties;
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Sexp.Str body]})
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(Sexp.Str "")
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then ()
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2012-03-04 18:03:08 +00:00
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else send_warning conn not_found ("Exchange "^exchange^" not found")
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2012-03-04 17:12:20 +00:00
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| Basic_ack (delivery_tag, multiple) ->
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()
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2012-03-03 23:04:52 +00:00
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| _ ->
|
|
|
|
let (cid, mid) = method_index m in
|
2012-03-04 05:12:59 +00:00
|
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|
die not_implemented (Printf.sprintf "Unsupported method (or method arguments) %s"
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|
|
(method_name cid mid))
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2012-03-03 23:04:52 +00:00
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|
2012-03-04 05:12:59 +00:00
|
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|
let server_properties = table_of_list [
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|
|
("product", Table_string App_info.product);
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("version", Table_string App_info.version);
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|
("copyright", Table_string App_info.copyright);
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|
("licence", Table_string App_info.licence);
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|
|
("capabilities", Table_table (table_of_list []));
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]
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|
let check_login_details mechanism response =
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|
|
match mechanism with
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| "PLAIN" ->
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|
(match (Str.split (Str.regexp "\000") response) with
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| ["guest"; "guest"] -> ()
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|
|
| _ -> die access_refused "Access refused")
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|
| "AMQPLAIN" ->
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|
|
|
(let fields = decode_named_fields (Ibuffer.of_string response) in
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|
|
|
match (field_lookup_some "LOGIN" fields, field_lookup_some "PASSWORD" fields) with
|
|
|
|
| (Some (Table_string "guest"), Some (Table_string "guest")) -> ()
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|
|
|
| _ -> die access_refused "Access refused")
|
|
|
|
| _ -> die access_refused "Bad auth mechanism"
|
|
|
|
|
|
|
|
let tune_connection conn frame_max =
|
|
|
|
with_conn_mutex conn (fun () ->
|
|
|
|
conn.input_buf <- String.create frame_max;
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|
|
conn.output_buf <- Buffer.create frame_max;
|
|
|
|
conn.frame_max <- frame_max)
|
|
|
|
|
|
|
|
let handshake_and_tune conn =
|
|
|
|
let (major_version, minor_version, revision) = version in
|
|
|
|
send_method conn 0 (Connection_start (major_version, minor_version, server_properties,
|
|
|
|
"PLAIN AMQPLAIN", "en_US"));
|
|
|
|
let (client_properties, mechanism, response, locale) =
|
|
|
|
match next_method conn with
|
|
|
|
| (0, Connection_start_ok props) -> props
|
|
|
|
| _ -> die not_allowed "Expected Connection_start_ok on channel 0"
|
|
|
|
in
|
|
|
|
check_login_details mechanism response;
|
|
|
|
Log.info "Connection from AMQP client" [sexp_of_table client_properties];
|
|
|
|
send_method conn 0 (Connection_tune (1, Int32.of_int suggested_frame_max, 0));
|
|
|
|
let (channel_max, frame_max, heartbeat) =
|
|
|
|
match next_method conn with
|
|
|
|
| (0, Connection_tune_ok props) -> props
|
|
|
|
| _ -> die not_allowed "Expected Connection_tune_ok on channel 0"
|
|
|
|
in
|
|
|
|
if channel_max > 1
|
|
|
|
then die not_implemented "Channel numbers higher than 1 are not supported" else ();
|
|
|
|
if (Int32.to_int frame_max) > suggested_frame_max
|
|
|
|
then die syntax_error "Requested frame max too large" else ();
|
|
|
|
if heartbeat > 0
|
|
|
|
then die not_implemented "Heartbeats not yet implemented (patches welcome)" else ();
|
|
|
|
tune_connection conn (Int32.to_int frame_max);
|
|
|
|
let (virtual_host) =
|
|
|
|
match next_method conn with
|
|
|
|
| (0, Connection_open props) -> props
|
|
|
|
| _ -> die not_allowed "Expected Connection_open on channel 0"
|
|
|
|
in
|
|
|
|
Log.info "Connected to vhost" [Sexp.Str virtual_host];
|
|
|
|
send_method conn 0 Connection_open_ok
|
2012-03-03 23:04:52 +00:00
|
|
|
|
2012-03-04 17:12:20 +00:00
|
|
|
let amqp_mainloop conn n =
|
|
|
|
Node.bind_ignore (conn.name, n);
|
2012-03-03 23:04:52 +00:00
|
|
|
(try
|
2012-03-04 05:12:59 +00:00
|
|
|
handshake_and_tune conn;
|
|
|
|
while not conn.connection_closed do
|
2012-03-03 23:04:52 +00:00
|
|
|
let (channel, m) = next_method conn in
|
2012-03-04 05:12:59 +00:00
|
|
|
handle_method conn channel m
|
2012-03-03 23:04:52 +00:00
|
|
|
done
|
|
|
|
with
|
2012-03-04 05:12:59 +00:00
|
|
|
| Amqp_exception (code, message) ->
|
2012-03-03 23:04:52 +00:00
|
|
|
send_error conn code message
|
|
|
|
)
|
|
|
|
|
|
|
|
let start (s, peername) =
|
2012-03-04 17:12:20 +00:00
|
|
|
Connections.start_connection "amqp" issue_banner
|
|
|
|
amqp_boot amqp_handler amqp_mainloop (s, peername)
|
2012-03-04 18:03:38 +00:00
|
|
|
|
|
|
|
let init () =
|
|
|
|
Node.send_ignore "factory" (Message.create (Sexp.Str "direct",
|
|
|
|
Sexp.Arr [Sexp.Str "amq.direct"],
|
|
|
|
Sexp.Str "", Sexp.Str ""));
|
|
|
|
ignore (Util.create_thread "AMQP listener" None (Net.start_net Amqp_spec.port) start)
|