X-Git-Url: http://www.dolda2000.com/gitweb/?p=ashd.git;a=blobdiff_plain;f=python%2Fashd%2Fserve.py;fp=python%2Fashd%2Fserve.py;h=e9f92b0467cf1e44ed635316e94bff793270dc05;hp=0000000000000000000000000000000000000000;hb=bcad6b0c48d516ddc920b52f06083ceaa242e1ca;hpb=589987f8218c9aa61d65f582a3b3e1bbd32bda81

diff --git a/python/ashd/serve.py b/python/ashd/serve.py
new file mode 100644
index 0000000..e9f92b0
--- /dev/null
+++ b/python/ashd/serve.py
@@ -0,0 +1,366 @@
+import sys, os, threading, time, logging, select, Queue
+import perf
+
+log = logging.getLogger("ashd.serve")
+seq = 1
+seqlk = threading.Lock()
+
+def reqseq():
+    global seq
+    with seqlk:
+        s = seq
+        seq += 1
+        return s
+
+class closed(IOError):
+    def __init__(self):
+        super(closed, self).__init__("The client has closed the connection.")
+
+class reqthread(threading.Thread):
+    def __init__(self, name=None, **kw):
+        if name is None:
+            name = "Request handler %i" % reqseq()
+        super(reqthread, self).__init__(name=name, **kw)
+
+class wsgirequest(object):
+    def __init__(self, handler):
+        self.status = None
+        self.headers = []
+        self.respsent = False
+        self.handler = handler
+        self.buffer = bytearray()
+
+    def handlewsgi(self):
+        raise Exception()
+    def fileno(self):
+        raise Exception()
+    def writehead(self, status, headers):
+        raise Exception()
+    def flush(self):
+        raise Exception()
+    def close(self):
+        pass
+    def writedata(self, data):
+        self.buffer.extend(data)
+
+    def flushreq(self):
+        if not self.respsent:
+            if not self.status:
+                raise Exception("Cannot send response body before starting response.")
+            self.respsent = True
+            self.writehead(self.status, self.headers)
+
+    def write(self, data):
+        if not data:
+            return
+        self.flushreq()
+        self.writedata(data)
+        self.handler.ckflush(self)
+
+    def startreq(self, status, headers, exc_info=None):
+        if self.status:
+            if exc_info:
+                try:
+                    if self.respsent:
+                        raise exc_info[1]
+                finally:
+                    exc_info = None
+            else:
+                raise Exception("Can only start responding once.")
+        self.status = status
+        self.headers = headers
+        return self.write
+
+class handler(object):
+    def handle(self, request):
+        raise Exception()
+    def ckflush(self, req):
+        while len(req.buffer) > 0:
+            rls, wls, els = select.select([], [req], [req])
+            req.flush()
+    def close(self):
+        pass
+
+    @classmethod
+    def parseargs(cls, **args):
+        if len(args) > 0:
+            raise ValueError("unknown handler argument: " + iter(args).next())
+        return {}
+
+class single(handler):
+    cname = "single"
+
+    def handle(self, req):
+        try:
+            env = req.mkenv()
+            with perf.request(env) as reqevent:
+                respiter = req.handlewsgi(env, req.startreq)
+                for data in respiter:
+                    req.write(data)
+                if req.status:
+                    reqevent.response([req.status, req.headers])
+                    req.flushreq()
+                self.ckflush(req)
+        except closed:
+            pass
+        except:
+            log.error("exception occurred when handling request", exc_info=True)
+        finally:
+            req.close()
+
+class freethread(handler):
+    cname = "free"
+
+    def __init__(self, max=None, timeout=None, **kw):
+        super(freethread, self).__init__(**kw)
+        self.current = set()
+        self.lk = threading.Lock()
+        self.tcond = threading.Condition(self.lk)
+        self.max = max
+        self.timeout = timeout
+
+    @classmethod
+    def parseargs(cls, max=None, abort=None, **args):
+        ret = super(freethread, cls).parseargs(**args)
+        if max:
+            ret["max"] = int(max)
+        if abort:
+            ret["timeout"] = int(abort)
+        return ret
+
+    def handle(self, req):
+        with self.lk:
+            if self.max is not None:
+                if self.timeout is not None:
+                    now = start = time.time()
+                    while len(self.current) >= self.max:
+                        self.tcond.wait(start + self.timeout - now)
+                        now = time.time()
+                        if now - start > self.timeout:
+                            os.abort()
+                else:
+                    while len(self.current) >= self.max:
+                        self.tcond.wait()
+            th = reqthread(target=self.run, args=[req])
+            th.registered = False
+            th.start()
+            while not th.registered:
+                self.tcond.wait()
+
+    def run(self, req):
+        try:
+            th = threading.current_thread()
+            with self.lk:
+                self.current.add(th)
+                th.registered = True
+                self.tcond.notify_all()
+            try:
+                env = req.mkenv()
+                with perf.request(env) as reqevent:
+                    respiter = req.handlewsgi(env, req.startreq)
+                    for data in respiter:
+                        req.write(data)
+                    if req.status:
+                        reqevent.response([req.status, req.headers])
+                        req.flushreq()
+                    self.ckflush(req)
+            except closed:
+                pass
+            except:
+                log.error("exception occurred when handling request", exc_info=True)
+            finally:
+                with self.lk:
+                    self.current.remove(th)
+                    self.tcond.notify_all()
+        finally:
+            req.close()
+
+    def close(self):
+        while True:
+            with self.lk:
+                if len(self.current) > 0:
+                    th = iter(self.current).next()
+                else:
+                    return
+            th.join()
+
+class resplex(handler):
+    cname = "rplex"
+
+    def __init__(self, max=None, **kw):
+        super(resplex, self).__init__(**kw)
+        self.current = set()
+        self.lk = threading.Lock()
+        self.tcond = threading.Condition(self.lk)
+        self.max = max
+        self.cqueue = Queue.Queue(5)
+        self.cnpipe = os.pipe()
+        self.rthread = reqthread(name="Response thread", target=self.handle2)
+        self.rthread.start()
+
+    @classmethod
+    def parseargs(cls, max=None, **args):
+        ret = super(resplex, cls).parseargs(**args)
+        if max:
+            ret["max"] = int(max)
+        return ret
+
+    def ckflush(self, req):
+        raise Exception("resplex handler does not support the write() function")
+
+    def handle(self, req):
+        with self.lk:
+            if self.max is not None:
+                while len(self.current) >= self.max:
+                    self.tcond.wait()
+            th = reqthread(target=self.handle1, args=[req])
+            th.registered = False
+            th.start()
+            while not th.registered:
+                self.tcond.wait()
+
+    def handle1(self, req):
+        try:
+            th = threading.current_thread()
+            with self.lk:
+                self.current.add(th)
+                th.registered = True
+                self.tcond.notify_all()
+            try:
+                env = req.mkenv()
+                respobj = req.handlewsgi(env, req.startreq)
+                respiter = iter(respobj)
+                if not req.status:
+                    log.error("request handler returned without calling start_request")
+                    if hasattr(respiter, "close"):
+                        respiter.close()
+                    return
+                else:
+                    self.cqueue.put((req, respiter))
+                    os.write(self.cnpipe[1], " ")
+                    req = None
+            finally:
+                with self.lk:
+                    self.current.remove(th)
+                    self.tcond.notify_all()
+        except closed:
+            pass
+        except:
+            log.error("exception occurred when handling request", exc_info=True)
+        finally:
+            if req is not None:
+                req.close()
+
+    def handle2(self):
+        try:
+            rp = self.cnpipe[0]
+            current = {}
+
+            def closereq(req):
+                respiter = current[req]
+                try:
+                    if respiter is not None and hasattr(respiter, "close"):
+                        respiter.close()
+                except:
+                    log.error("exception occurred when closing iterator", exc_info=True)
+                try:
+                    req.close()
+                except:
+                    log.error("exception occurred when closing request", exc_info=True)
+                del current[req]
+            def ckiter(req):
+                respiter = current[req]
+                if respiter is not None:
+                    rem = False
+                    try:
+                        data = respiter.next()
+                    except StopIteration:
+                        rem = True
+                        try:
+                            req.flushreq()
+                        except:
+                            log.error("exception occurred when handling response data", exc_info=True)
+                    except:
+                        rem = True
+                        log.error("exception occurred when iterating response", exc_info=True)
+                    if not rem:
+                        if data:
+                            try:
+                                req.flushreq()
+                                req.writedata(data)
+                            except:
+                                log.error("exception occurred when handling response data", exc_info=True)
+                                rem = True
+                    if rem:
+                        current[req] = None
+                        try:
+                            if hasattr(respiter, "close"):
+                                respiter.close()
+                        except:
+                            log.error("exception occurred when closing iterator", exc_info=True)
+                        respiter = None
+                if respiter is None and not req.buffer:
+                    closereq(req)
+
+            while True:
+                bufl = list(req for req in current.iterkeys() if req.buffer)
+                rls, wls, els = select.select([rp], bufl, [rp] + bufl)
+                if rp in rls:
+                    ret = os.read(rp, 1024)
+                    if not ret:
+                        os.close(rp)
+                        return
+                    try:
+                        while True:
+                            req, respiter = self.cqueue.get(False)
+                            current[req] = respiter
+                            ckiter(req)
+                    except Queue.Empty:
+                        pass
+                for req in wls:
+                    try:
+                        req.flush()
+                    except closed:
+                        closereq(req)
+                    except:
+                        log.error("exception occurred when writing response", exc_info=True)
+                        closereq(req)
+                    else:
+                        if len(req.buffer) < 65536:
+                            ckiter(req)
+        except:
+            log.critical("unexpected exception occurred in response handler thread", exc_info=True)
+            os.abort()
+
+    def close(self):
+        while True:
+            with self.lk:
+                if len(self.current) > 0:
+                    th = iter(self.current).next()
+                else:
+                    break
+            th.join()
+        os.close(self.cnpipe[1])
+        self.rthread.join()
+
+names = dict((cls.cname, cls) for cls in globals().itervalues() if
+             isinstance(cls, type) and
+             issubclass(cls, handler) and
+             hasattr(cls, "cname"))
+
+def parsehspec(spec):
+    if ":" not in spec:
+        return spec, {}
+    nm, spec = spec.split(":", 1)
+    args = {}
+    while spec:
+        if "," in spec:
+            part, spec = spec.split(",", 1)
+        else:
+            part, spec = spec, None
+        if "=" in part:
+            key, val = part.split("=", 1)
+        else:
+            key, val = part, ""
+        args[key] = val
+    return nm, args