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docgen understands and ignores *when false*
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Araq
245
examples/httpserver2.nim
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245
examples/httpserver2.nim
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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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type
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TRequestMethod = enum reqGet, reqPost
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TServer* = object ## contains the current server state
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socket: TSocket
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job: seq[TJob]
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TJob* = object
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client: TSocket
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process: PProcess
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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.</p>" & 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.</p>" & 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, path: string) =
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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 <b>" & path & "</b>" & wwwNL)
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send(client, "is unavailable or nonexistent.</p>" & 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.</p>" &
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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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client.close()
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else:
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notFound(client, filename)
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# ------------------ CGI execution -------------------------------------------
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proc executeCgi(server: var TServer, client: TSocket, path, query: string,
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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 = true
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while dataAvail:
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dataAvail = recvLine(client, buf)
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if buf.len == 0:
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break
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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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var job: TJob
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job.process = process
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job.client = client
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server.job.add(job)
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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:
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dealloc(buf)
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OSError()
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var inp = process.inputStream
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inp.writeData(inp, buf, contentLength)
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dealloc(buf)
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proc animate(server: var TServer) =
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# checks list of jobs, removes finished ones (pretty sloppy by seq copying)
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var active_jobs: seq[TJob] = @[]
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for i in 0..server.job.len-1:
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var job = server.job[i]
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if running(job.process):
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active_jobs.add(job)
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else:
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# read process output stream and send it to client
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var outp = job.process.outputStream
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while true:
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var line = outp.readstr(1024)
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if line.len == 0:
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break
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else:
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try:
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send(job.client, line)
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except:
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echo("send failed, client diconnected")
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close(job.client)
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server.job = active_jobs
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# --------------- Server Setup -----------------------------------------------
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proc acceptRequest(server: var TServer, 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 path = ""
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var data = buf.split()
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var meth = reqGet
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var q = find(data[1], '?')
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# extract path
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if q >= 0:
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# strip "?..." from path, this may be found in both POST and GET
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path = data[1].copy(0, q-1)
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else:
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path = data[1]
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# path starts with "/", by adding "." in front of it we serve files from cwd
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path = "." & path
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echo("accept: " & path)
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if cmpIgnoreCase(data[0], "GET") == 0:
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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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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, path)
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client.close()
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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(server, client, path, query, meth)
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when isMainModule:
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var port = 80
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var server: TServer
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server.job = @[]
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server.socket = socket(AF_INET)
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if server.socket == InvalidSocket: OSError()
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server.socket.bindAddr(port=TPort(port))
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listen(server.socket)
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echo("server up on port " & $port)
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while true:
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# check for new new connection & handle it
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var list: seq[TSocket] = @[server.socket]
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if select(list, 10) > 0:
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var client = accept(server.socket)
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try:
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acceptRequest(server, client)
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except:
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echo("failed to accept client request")
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# pooling events
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animate(server)
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# some slack for CPU
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sleep(10)
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server.socket.close()
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