core/server.nim
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import net, asynchttpserver, asyncdispatch, httpclient, streams, critbits, pegs, strutils import regex, types, parser, interpreter, utils proc validUrl(req: Request, url: string): bool = return req.url.path == url or req.url.path == url & "/" proc validMethod(req: Request, meth: string): bool = return req.reqMethod == meth or req.reqMethod == meth.toLower proc parseException(host: string): string = let e = getCurrentException() result = """($1 ("$2" "$3"))""" % [host, regex.replace($e.name, ":.+$", ""), e.msg] proc exec(req: Request, interpreter: MinInterpreter, hosts: CritBitTree[string]): string {.gcsafe.}= let filename = "request" let s = newStringStream(req.body) var i = interpreter i.open(s, filename) discard i.parser.getToken() try: i.interpret() result = i.dump() except: echo getCurrentExceptionMsg() result = i.link.name.parseException finally: i.close() proc process(req: Request, i: MinInterpreter, hosts: CritBitTree[string]): string {.gcsafe.} = var matches = @["", "", ""] template route(req, peg: expr, op: stmt): stmt {.immediate.}= if req.url.path.find(peg, matches) != -1: op req.route peg"^\/?$": if not req.validMethod("GET"): raiseServer(Http405, "Method Not Allowed: " & req.reqMethod) return "MiNiM Host '$1'" % [i.link.name] req.route peg"^\/exec\/?$": if not req.validMethod("POST"): raiseServer(Http405, "Method Not Allowed: " & req.reqMethod) return exec(req, i, hosts) raiseServer(Http400, "Bad Request: POST "& req.url.path) proc init*(link: ref MinLink) {.thread.} = proc handleHttpRequest(req: Request): Future[void] {.async.} = var res: string var code: HttpCode = Http200 try: res = req.process(link.interpreter, link.hosts) except MinServerError: let e: MinServerError = (MinServerError)getCurrentException() res = e.msg code = e.code await req.respond(code, res) asyncCheck link.server.serve(link.port, handleHttpRequest, link.address) proc remoteExec*(i: var MinInterpreter, host, content: string): string {.gcsafe.}= if i.link.hosts.hasKey(host): let url = "http://" & i.link.hosts[host] & "/exec" try: result = "($1 $2)" % [host, url.postContent(body = content, sslContext = nil)] except: result = host.parseException else: raiseServer(Http404, "Not Found: Host '$1'" % [host]) proc syncHosts*(i: In): CritBitTree[string] {.gcsafe.}= var cmd = "" for key, val in i.link.hosts.pairs: cmd = cmd & """ ($1 "$2")""" % [key, val] cmd = "(" & cmd.strip & ") comm %set-hosts" for key, val in i.link.hosts.pairs: if key != i.link.name: result[key] = i.remoteExec(key, cmd) proc checkHost*(link: ref MinLink) = let host = link.address & ":" & $link.port try: link.hosts = cfgGet("hosts").critbit except: discard var name: string for key, value in link.hosts.pairs: if host == value: name = key break if not name.isNil: link.hosts.excl name link.hosts[link.name] = host discard link.interpreter.syncHosts() proc executeOnHost*(i: var MinInterpreter, host: string, q: MinValue): string = if not i.link.hosts.hasKey(host): raiseInvalid("Unknown host: " & host) return i.remoteExec(host, $q & " unquote") proc newMinLink*(name, address: string, port: int, i: var MinInterpreter): ref MinLink = var link: ref MinLink = new MinLink result = link result.server = newAsyncHttpServer() result.name = name result.address = address result.port = port.Port i.link = result result.interpreter = i |