mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-12-26 04:28:20 +01:00
HTTP message bodies are transfered using a callback to return body parts
chunk by chunk.
This commit is contained in:
Diego Nehab
parent
f68b4dd136
commit
f1ae9db45e
326
src/http.lua
326
src/http.lua
@ -14,7 +14,7 @@ local TIMEOUT = 60
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-- default port for document retrieval
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local PORT = 80
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-- user agent field sent in request
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local USERAGENT = "LuaSocket 1.2 HTTP 1.1"
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local USERAGENT = "LuaSocket 1.3 HTTP 1.1"
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-----------------------------------------------------------------------------
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-- Tries to get a pattern from the server and closes socket on error
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@ -86,7 +86,7 @@ end
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-- all name_i are lowercase
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-- nil and error message in case of error
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-----------------------------------------------------------------------------
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local get_headers = function(sock, headers)
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local get_hdrs = function(sock, headers)
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local line, err
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local name, value
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-- get first line
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@ -121,63 +121,120 @@ end
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-- Receives a chunked message body
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-- Input
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-- sock: socket connected to the server
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-- callback: function to receive chunks
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-- Returns
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-- body: a string containing the body of the message
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-- nil and error message in case of error
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-- nil if successfull or an error message in case of error
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-----------------------------------------------------------------------------
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local try_getchunked = function(sock)
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local chunk_size, line, err
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local body = ""
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local try_getchunked = function(sock, callback)
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local chunk, size, line, err
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repeat
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-- get chunk size, skip extention
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line, err = %try_get(sock)
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if err then return nil, err end
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chunk_size = tonumber(gsub(line, ";.*", ""), 16)
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if not chunk_size then
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if err then
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callback(nil, err)
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return err
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end
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size = tonumber(gsub(line, ";.*", ""), 16)
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if not size then
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sock:close()
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return nil, "invalid chunk size"
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callback(nil, "invalid chunk size")
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return "invalid chunk size"
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end
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-- get chunk
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line, err = %try_get(sock, chunk_size)
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if err then return nil, err end
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-- concatenate new chunk
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body = body .. line
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chunk, err = %try_get(sock, size)
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if err then
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callback(nil, err)
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return err
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end
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-- pass chunk to callback
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if not callback(chunk) then
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sock:close()
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return "aborted by callback"
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end
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-- skip blank line
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_, err = %try_get(sock)
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if err then return nil, err end
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until chunk_size <= 0
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return body
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if err then
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callback(nil, err)
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return err
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end
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until size <= 0
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-- let callback know we are done
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callback("", "done")
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end
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-----------------------------------------------------------------------------
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-- Receives http body
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-- Receives a message body by content-length
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-- Input
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-- sock: socket connected to the server
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-- headers: response header fields
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-- callback: function to receive chunks
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-- Returns
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-- body: a string containing the body of the document
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-- nil and error message in case of error
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-- Obs:
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-- headers: headers might be modified by chunked transfer
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-- nil if successfull or an error message in case of error
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-----------------------------------------------------------------------------
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local get_body = function(sock, headers)
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local body, err
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if headers["transfer-encoding"] == "chunked" then
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body, err = %try_getchunked(sock)
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if err then return nil, err end
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-- store extra entity headers
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--_, err = %get_headers(sock, headers)
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--if err then return nil, err end
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elseif headers["content-length"] then
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body, err = %try_get(sock, tonumber(headers["content-length"]))
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if err then return nil, err end
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else
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-- get it all until connection closes!
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body, err = %try_get(sock, "*a")
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if err then return nil, err end
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local try_getbylength = function(sock, length, callback)
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while length > 0 do
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local size = min(4096, length)
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local chunk, err = sock:receive(size)
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if err then
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callback(nil, err)
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return err
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end
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if not callback(chunk) then
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sock:close()
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return "aborted by callback"
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end
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length = length - size
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end
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callback("", "done")
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end
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-----------------------------------------------------------------------------
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-- Receives a message body by content-length
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-- Input
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-- sock: socket connected to the server
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-- callback: function to receive chunks
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-- Returns
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-- nil if successfull or an error message in case of error
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-----------------------------------------------------------------------------
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local try_getuntilclosed = function(sock, callback)
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local err
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while 1 do
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local chunk, err = sock:receive(4096)
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if err == "closed" or not err then
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if not callback(chunk) then
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sock:close()
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return "aborted by callback"
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end
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if err then break end
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else
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callback(nil, err)
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return err
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end
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end
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callback("", "done")
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end
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-----------------------------------------------------------------------------
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-- Receives http response body
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-- Input
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-- sock: socket connected to the server
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-- resp_hdrs: response header fields
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-- callback: function to receive chunks
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-- Returns
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-- nil if successfull or an error message in case of error
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-----------------------------------------------------------------------------
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local try_getbody = function(sock, resp_hdrs, callback)
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local err
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if resp_hdrs["transfer-encoding"] == "chunked" then
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-- get by chunked transfer-coding of message body
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return %try_getchunked(sock, callback)
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elseif tonumber(resp_hdrs["content-length"]) then
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-- get by content-length
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local length = tonumber(resp_hdrs["content-length"])
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return %try_getbylength(sock, length, callback)
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else
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-- get it all until connection closes
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return %try_getuntilclosed(sock, callback)
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end
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-- return whole body
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return body
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end
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-----------------------------------------------------------------------------
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@ -218,58 +275,52 @@ local split_url = function(url, default)
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return parsed
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end
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-----------------------------------------------------------------------------
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-- Tries to send request body, using chunked transfer-encoding
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-- Apache, for instance, accepts only 8kb of body in a post to a CGI script
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-- if we use only the content-length header field...
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-- Input
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-- sock: socket connected to the server
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-- body: body to be sent in request
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-- Returns
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-- err: nil in case of success, error message otherwise
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-----------------------------------------------------------------------------
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local try_sendchunked = function(sock, body)
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local wanted = strlen(body)
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local first = 1
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local chunk_size
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local err
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while wanted > 0 do
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chunk_size = min(wanted, 1024)
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err = %try_send(sock, format("%x\r\n", chunk_size))
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if err then return err end
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err = %try_send(sock, strsub(body, first, first + chunk_size - 1))
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if err then return err end
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err = %try_send(sock, "\r\n")
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if err then return err end
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wanted = wanted - chunk_size
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first = first + chunk_size
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end
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err = %try_send(sock, "0\r\n")
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return err
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end
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-----------------------------------------------------------------------------
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-- Sends a http request message through socket
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-- Input
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-- sock: socket connected to the server
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-- method: request method to be used
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-- path: url path
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-- headers: request headers to be sent
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-- body: request message body, if any
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-- req_hdrs: request headers to be sent
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-- callback: callback to send request message body
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-- Returns
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-- err: nil in case of success, error message otherwise
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-----------------------------------------------------------------------------
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local send_request = function(sock, method, path, headers, body)
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local send_request = function(sock, method, path, req_hdrs, callback)
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local chunk, size, done
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-- send request line
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local err = %try_send(sock, method .. " " .. path .. " HTTP/1.1\r\n")
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if err then return err end
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for i, v in headers do
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-- send request headers
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for i, v in req_hdrs do
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err = %try_send(sock, i .. ": " .. v .. "\r\n")
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if err then return err end
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end
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-- if there is a request message body, add content-length header
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if callback then
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chunk, size = callback()
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if chunk and size then
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err = %try_send(sock, "content-length: "..tostring(size).."\r\n")
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if err then return err end
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else
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sock:close()
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return size or "invalid callback return"
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end
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end
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-- mark end of request headers
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err = %try_send(sock, "\r\n")
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--if not err and body then err = %try_sendchunked(sock, body) end
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if not err and body then err = %try_send(sock, body) end
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return err
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if err then return err end
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-- send message request body, getting it chunk by chunk from callback
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if callback then
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done = 0
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while chunk and chunk ~= "" and done < size do
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err = %try_send(sock, chunk)
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if err then return err end
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done = done + strlen(chunk)
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chunk, err = callback()
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end
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if not chunk then return err end
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end
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end
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-----------------------------------------------------------------------------
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@ -280,13 +331,18 @@ end
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-- Returns
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-- 1 if a message body should be processed, nil otherwise
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-----------------------------------------------------------------------------
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function has_responsebody(method, code)
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function has_respbody(method, code)
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if method == "HEAD" then return nil end
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if code == 204 or code == 304 then return nil end
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if code >= 100 and code < 200 then return nil end
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return 1
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end
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-----------------------------------------------------------------------------
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-- We need base64 convertion routines for Basic Authentication Scheme
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-----------------------------------------------------------------------------
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dofile("base64.lua")
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-----------------------------------------------------------------------------
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-- Converts field names to lowercase and add message body size specification
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-- Input
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@ -296,14 +352,12 @@ end
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-- Returns
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-- lower: a table with the same headers, but with lowercase field names
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-----------------------------------------------------------------------------
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local fill_headers = function(headers, parsed, body)
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local fill_hdrs = function(headers, parsed, body)
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local lower = {}
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headers = headers or {}
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for i,v in headers do
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lower[strlower(i)] = v
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end
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--if body then lower["transfer-encoding"] = "chunked" end
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if body then lower["content-length"] = tostring(strlen(body)) end
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lower["connection"] = "close"
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lower["host"] = parsed.host
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lower["user-agent"] = %USERAGENT
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@ -315,9 +369,58 @@ local fill_headers = function(headers, parsed, body)
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end
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-----------------------------------------------------------------------------
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-- We need base64 convertion routines for Basic Authentication Scheme
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-- Sends a HTTP request and retrieves the server reply using callbacks to
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-- send the request body and receive the response body
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-- Input
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-- method: "GET", "PUT", "POST" etc
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-- url: target uniform resource locator
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-- req_hdrs: request headers to send
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-- req_body: function to return request message body
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-- resp_body: function to receive response message body
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-- Returns
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-- resp_hdrs: response header fields received, if sucessfull
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-- resp_line: server response status line, if successfull
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-- err: error message if any
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-----------------------------------------------------------------------------
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dofile("base64.lua")
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function http_requestindirect(method, url, req_hdrs, req_body, resp_body)
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local sock, err
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local resp_hdrs
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local resp_line, resp_code
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-- get url components
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local parsed = %split_url(url, {port = %PORT, path ="/"})
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-- methods are case sensitive
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method = strupper(method)
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-- fill default headers
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req_hdrs = %fill_hdrs(req_hdrs, parsed)
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-- try connection
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sock, err = connect(parsed.host, parsed.port)
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if not sock then return nil, nil, err end
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-- set connection timeout
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sock:timeout(%TIMEOUT)
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-- send request
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err = %send_request(sock, method, parsed.path, req_hdrs, req_body)
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if err then return nil, nil, err end
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-- get server message
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resp_code, resp_line, err = %get_status(sock)
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if err then return nil, nil, err end
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-- deal with reply
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resp_hdrs, err = %get_hdrs(sock, {})
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if err then return nil, line, err end
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-- did we get a redirect? should we automatically retry?
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if (resp_code == 301 or resp_code == 302) and
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(method == "GET" or method == "HEAD") then
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sock:close()
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return http_requestindirect(method, resp_hdrs["location"], req_hdrs,
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req_body, resp_body)
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end
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-- get body if status and method combination allow one
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if has_respbody(method, resp_code) then
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err = %try_getbody(sock, resp_hdrs, resp_body)
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if err then return resp_hdrs, resp_line, err end
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end
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sock:close()
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return resp_hdrs, resp_line
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end
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-----------------------------------------------------------------------------
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-- Sends a HTTP request and retrieves the server reply
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@ -329,46 +432,29 @@ dofile("base64.lua")
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-- Returns
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-- resp_body: response message body, if successfull
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-- resp_hdrs: response header fields received, if sucessfull
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-- line: server response status line, if successfull
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-- resp_line: server response status line, if successfull
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-- err: error message if any
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-----------------------------------------------------------------------------
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function http_request(method, url, headers, body)
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local sock, err
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local resp_hdrs, response_body
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local line, code
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-- get url components
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local parsed = %split_url(url, {port = %PORT, path ="/"})
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-- methods are case sensitive
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method = strupper(method)
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-- fill default headers
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headers = %fill_headers(headers, parsed, body)
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-- try connection
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sock, err = connect(parsed.host, parsed.port)
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if not sock then return nil, nil, nil, err end
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-- set connection timeout
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sock:timeout(%TIMEOUT)
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-- send request
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err = %send_request(sock, method, parsed.path, headers, body)
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if err then return nil, nil, nil, err end
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-- get server message
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code, line, err = %get_status(sock)
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if err then return nil, nil, nil, err end
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-- deal with reply
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resp_hdrs, err = %get_headers(sock, {})
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if err then return nil, nil, line, err end
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-- get body if status and method allow one
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if has_responsebody(method, code) then
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resp_body, err = %get_body(sock, resp_hdrs)
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if err then return nil, resp_hdrs, line, err end
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function http_request(method, url, req_hdrs, body)
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local resp_hdrs, resp_line, err
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local req_callback = function()
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return %body, strlen(%body)
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end
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sock:close()
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-- should we automatically retry?
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if (code == 301 or code == 302) then
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if (method == "GET" or method == "HEAD") and resp_hdrs["location"] then
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return http_request(method, resp_hdrs["location"], headers, body)
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else return nil, resp_hdrs, line end
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local resp_aux = { resp_body = "" }
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local resp_callback = function(chunk, err)
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if not chunk then
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%resp_aux.resp_body = nil
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%resp_aux.err = err
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return nil
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end
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return resp_body, resp_hdrs, line
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%resp_aux.resp_body = %resp_aux.resp_body .. chunk
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return 1
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end
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if not body then resp_callback = nil end
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resp_hdrs, resp_line, err = http_requestindirect(method, url, req_hdrs,
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req_callback, resp_callback)
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if err then return nil, resp_hdrs, resp_line, err
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else return resp_aux.resp_body, resp_hdrs, resp_line, resp_aux.err end
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end
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-----------------------------------------------------------------------------
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