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 & ") 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
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