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-rw-r--r--util/httpstream.lua89
1 files changed, 89 insertions, 0 deletions
diff --git a/util/httpstream.lua b/util/httpstream.lua
new file mode 100644
index 00000000..09116e67
--- /dev/null
+++ b/util/httpstream.lua
@@ -0,0 +1,89 @@
+
+local setmetatable = setmetatable;
+local coroutine = coroutine;
+local tonumber = tonumber;
+
+local print = print;
+local error = error;
+local ser = require "util.serialization".serialize;
+
+local deadroutine = coroutine.create(function() end);
+coroutine.resume(deadroutine);
+
+module("httpstream")
+
+local function parser(data, success_cb)
+ local function readline()
+ if not data then coroutine.yield("Unexpected EOF"); end
+ local pos, line = (data:find("\r\n", nil, true));
+ if not pos then
+ local newdata = coroutine.yield();
+ if not newdata then data = nil; coroutine.yield("Unexpected EOF"); end
+ data = data..newdata;
+ return readline();
+ end
+ line, data = data:sub(1, pos-1), data:sub(pos+2);
+ return line;
+ end
+ local function readlength(n)
+ if not data then coroutine.yield("Unexpected EOF"); end
+ while #data < n do
+ local newdata = coroutine.yield();
+ if not newdata then data = nil; coroutine.yield("Unexpected EOF"); end
+ data = data..newdata;
+ end
+ local r = data:sub(1, n);
+ data = data:sub(n + 1);
+ return r;
+ end
+
+ while true do
+ -- read status line
+ local status_line = readline();
+ local method, path, httpversion = status_line:match("^(%S+)%s+(%S+)%s+HTTP/(%S+)$");
+ if not method then coroutine.yield("invalid-status-line"); end
+ -- TODO parse url
+
+ local headers = {}; -- read headers
+ while true do
+ local line = readline();
+ if line == "" then break; end -- headers done
+ local key, val = line:match("^([^%s:]+): *(.*)$");
+ if not key then coroutine.yield("invalid-header-line"); end -- TODO handle multi-line and invalid headers
+ key = key:lower();
+ headers[key] = headers[key] and headers[key]..","..val or val;
+ end
+
+ -- read body
+ local len = tonumber(headers["content-length"]);
+ len = len or 0; -- TODO check for invalid len
+ local body = readlength(len);
+
+ success_cb({
+ method = method;
+ path = path;
+ httpversion = httpversion;
+ headers = headers;
+ body = body;
+ });
+ end
+end
+
+function new(success_cb, error_cb)
+ local co = coroutine.create(parser);
+ return {
+ feed = function(self, data)
+ local success, result = coroutine.resume(co, data, success_cb);
+ if result then
+ if result.method then
+ success_cb(result);
+ else -- error
+ error_cb(result);
+ co = deadroutine;
+ end
+ end
+ end;
+ };
+end
+
+return _M;