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https://github.com/nim-lang/Nim.git
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httpserver supports a fixed port number
This commit is contained in:
Andreas Rumpf
259
lib/pure/httpserver.nim
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259
lib/pure/httpserver.nim
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#
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#
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# Nimrod's Runtime Library
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# (c) Copyright 2010 Andreas Rumpf
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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## This module implements a simple HTTP-Server.
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##
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## Example:
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##
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## .. code-block:: nimrod
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## import strutils, sockets, httpserver
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##
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## var counter = 0
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## proc handleRequest(client: TSocket, path, query: string): bool {.procvar.} =
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## inc(counter)
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## client.send("Hallo for the $#th time." % $counter & wwwNL)
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## return false # do not stop processing
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##
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## run(handleRequest, TPort(80))
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##
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import strutils, os, osproc, strtabs, streams, sockets
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const
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wwwNL* = "\r\L"
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ServerSig = "Server: httpserver.nim/1.0.0" & wwwNL
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# --------------- output messages --------------------------------------------
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proc sendTextContentType(client: TSocket) =
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send(client, "Content-type: text/html" & wwwNL)
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send(client, wwwNL)
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proc badRequest(client: TSocket) =
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# Inform the client that a request it has made has a problem.
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send(client, "HTTP/1.0 400 BAD REQUEST" & wwwNL)
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sendTextContentType(client)
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send(client, "<p>Your browser sent a bad request, " &
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"such as a POST without a Content-Length." & wwwNL)
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proc cannotExec(client: TSocket) =
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send(client, "HTTP/1.0 500 Internal Server Error" & wwwNL)
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sendTextContentType(client)
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send(client, "<P>Error prohibited CGI execution." & wwwNL)
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proc headers(client: TSocket, filename: string) =
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# XXX could use filename to determine file type
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send(client, "HTTP/1.0 200 OK" & wwwNL)
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send(client, ServerSig)
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sendTextContentType(client)
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proc notFound(client: TSocket) =
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send(client, "HTTP/1.0 404 NOT FOUND" & wwwNL)
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send(client, ServerSig)
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sendTextContentType(client)
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send(client, "<html><title>Not Found</title>" & wwwNL)
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send(client, "<body><p>The server could not fulfill" & wwwNL)
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send(client, "your request because the resource specified" & wwwNL)
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send(client, "is unavailable or nonexistent." & wwwNL)
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send(client, "</body></html>" & wwwNL)
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proc unimplemented(client: TSocket) =
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send(client, "HTTP/1.0 501 Method Not Implemented" & wwwNL)
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send(client, ServerSig)
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sendTextContentType(client)
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send(client, "<html><head><title>Method Not Implemented" &
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"</title></head>" &
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"<body><p>HTTP request method not supported." &
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"</body></HTML>" & wwwNL)
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# ----------------- file serving ---------------------------------------------
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proc discardHeaders(client: TSocket) = skip(client)
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proc serveFile(client: TSocket, filename: string) =
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discardHeaders(client)
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var f: TFile
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if open(f, filename):
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headers(client, filename)
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const bufSize = 8000 # != 8K might be good for memory manager
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var buf = alloc(bufsize)
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while True:
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var bytesread = readBuffer(f, buf, bufsize)
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if bytesread > 0:
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var byteswritten = send(client, buf, bytesread)
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if bytesread != bytesWritten:
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dealloc(buf)
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close(f)
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OSError()
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if bytesread != bufSize: break
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dealloc(buf)
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close(f)
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else:
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notFound(client)
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# ------------------ CGI execution -------------------------------------------
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type
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TRequestMethod = enum reqGet, reqPost
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proc executeCgi(client: TSocket, path, query: string, meth: TRequestMethod) =
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var env = newStringTable(modeCaseInsensitive)
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var contentLength = -1
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case meth
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of reqGet:
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discardHeaders(client)
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env["REQUEST_METHOD"] = "GET"
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env["QUERY_STRING"] = query
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of reqPost:
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var buf = ""
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var dataAvail = false
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while dataAvail:
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dataAvail = recvLine(client, buf)
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var L = toLower(buf)
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if L.startsWith("content-length:"):
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var i = len("content-length:")
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while L[i] in Whitespace: inc(i)
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contentLength = parseInt(copy(L, i))
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if contentLength < 0:
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badRequest(client)
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return
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env["REQUEST_METHOD"] = "POST"
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env["CONTENT_LENGTH"] = $contentLength
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send(client, "HTTP/1.0 200 OK" & wwwNL)
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var process = startProcess(command=path, env=env)
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if meth == reqPost:
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# get from client and post to CGI program:
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var buf = alloc(contentLength)
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if recv(client, buf, contentLength) != contentLength: OSError()
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var inp = process.inputStream
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inp.writeData(inp, buf, contentLength)
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var outp = process.outputStream
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while running(process) or not outp.atEnd(outp):
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var line = outp.readLine()
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send(client, line)
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send(client, wwwNL)
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# --------------- Server Setup -----------------------------------------------
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proc acceptRequest(client: TSocket) =
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var cgi = false
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var query = ""
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var buf = ""
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discard recvLine(client, buf)
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var data = buf.split()
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var meth = reqGet
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if cmpIgnoreCase(data[0], "GET") == 0:
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var q = find(data[1], '?')
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if q >= 0:
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cgi = true
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query = data[1].copy(q+1)
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elif cmpIgnoreCase(data[0], "POST") == 0:
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cgi = true
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meth = reqPost
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else:
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unimplemented(client)
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var path = data[1]
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if path[path.len-1] == '/' or existsDir(path):
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path = path / "index.html"
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if not ExistsFile(path):
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discardHeaders(client)
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notFound(client)
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else:
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when defined(Windows):
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var ext = splitFile(path).ext.toLower
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if ext == ".exe" or ext == ".cgi":
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# XXX: extract interpreter information here?
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cgi = true
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else:
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if {fpUserExec, fpGroupExec, fpOthersExec} * path.getFilePermissions != {}:
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cgi = true
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if not cgi:
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serveFile(client, path)
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else:
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executeCgi(client, path, query, meth)
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type
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TServer* = object ## contains the current server state
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socket: TSocket
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port: TPort
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client*: TSocket ## the socket to write the file data to
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path*, query*: string ## path and query the client requested
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proc open*(s: var TServer, port = TPort(80)) =
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## creates a new server at port `port`. If ``port == 0`` a free port is
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## aquired that can be accessed later by the ``port`` proc.
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s.socket = socket(AF_INET)
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if s.socket == InvalidSocket: OSError()
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bindAddr(s.socket, port)
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listen(s.socket)
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if port == TPort(0):
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s.port = getSockName(s.socket)
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else:
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s.port = port
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s.client = InvalidSocket
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s.path = ""
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s.query = ""
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proc port*(s: var TServer): TPort =
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## get the port number the server has aquired.
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result = s.port
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proc next*(s: var TServer) =
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## proceed to the first/next request.
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s.client = accept(s.socket)
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headers(s.client, "")
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var buf = ""
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discard recvLine(s.client, buf)
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var data = buf.split()
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if cmpIgnoreCase(data[0], "GET") == 0:
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var q = find(data[1], '?')
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if q >= 0:
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s.query = data[1].copy(q+1)
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s.path = data[1].copy(0, q-1)
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else:
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s.query = ""
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s.path = data[1]
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else:
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unimplemented(s.client)
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proc close*(s: TServer) =
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## closes the server (and the socket the server uses).
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close(s.socket)
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proc run*(handleRequest: proc (client: TSocket, path, query: string): bool,
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port = TPort(80)) =
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## encapsulates the server object and main loop
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var s: TServer
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open(s, port)
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#echo("httpserver running on port ", s.port)
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while true:
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next(s)
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if handleRequest(s.client, s.path, s.query): break
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close(s.client)
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close(s)
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when isMainModule:
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var counter = 0
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proc handleRequest(client: TSocket, path, query: string): bool {.procvar.} =
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inc(counter)
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client.send("Hallo, Andreas for the $#th time." % $counter & wwwNL)
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return false # do not stop processing
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run(handleRequest, TPort(80))
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