This basically turns off the HTTP layer for Kore. It does not
compile in anything for HTTP.
This allows Kore to be used as a network application platform as well.
Added an example for this called nohttp.
Other changes that sneaked in while hacking on this:
* Use calloc(), kill pendantic malloc option.
* Killed off SPDY/3.1 support completely, will be superseded by http2
Note that comes with massive changes to a lot of the core API
functions provided by Kore, these might break your application.
Add HTTP_REQUEST_NO_CONTENT_LENGTH which can be set by
a handler before calling http_response() to avoid Kore
from setting the content-length altogether.
If we are on a SPDY connection do not close the stream
if we do not pass data to http_response().
Introduces two new configuration knobs:
* socket_backlog (backlog for listen(2))
* http_request_limit
The second one is the most interesting one.
Before, kore would iterate over all received HTTP requests
in its queue before returning out of http_process().
Under heavy load this queue can cause Kore to spend a considerable
amount of time iterating over said queue. With the http_request_limit,
kore will process at MOST http_request_limit requests before returning
back to the event loop.
This means responses to processed requests are sent out much quicker
and allows kore to handle any other incoming requests more gracefully.
Signals Kore to not free any pointer set in req->hdlr_extra.
Useful in certain scenarios where you have data per request
bound to something in memory but do not want to lose it when
the request is freed by Kore.
Set this flag before your handler returns.
Introduces a few new api functions:
- kore_websocket_handshake(struct http_request *):
Performs the handshake on an HTTP request (coming from page handler)
- kore_websocket_send(struct connection *, u_int8_t, void *, size_t):
Sends data to a websocket connection.
- kore_websocket_broadcast(struct connection *, u_int8_t, void *, size_t, int):
Broadcast the given websocket op and data to all connected
websocket clients on the worker. Note that as of right now
the WEBSOCKET_BROADCAST_GLOBAL scope option does not work
yet and messages broadcasted will be restricted to workers
only.
- kore_worker_websocket_broadcast(struct connection *, void *, void *):
Backend function used by kore_websocket_broadcast().
Could prove useful for developers to have access to.
A simple example is given under examples/websocket.
Known issues:
Kore does not support PING or CONT frames just yet.
- The net code no longer has a recv_queue, instead reuse same recv buffer.
- Introduce net_recv_reset() to reset the recv buffer when needed.
- Have the workers spread the load better between them by slightly
delaying their next accept lock and giving them an accept treshold
so they don't go ahead and keep accepting connections if they end
up winning the race constantly between the workers.
- The kore_worker_acceptlock_release() is no longer available.
- Prepopulate the HTTP server response header that is added to each
response in both normal HTTP and SPDY modes.
- The path and host members of http_request are now allocated on the heap.
These changes overall result better performance on a multicore machine,
especially the worker load changes shine through.
This commit renames certain POST centric variable and configuration
naming to the correct HTTP body stuff.
API changes include http_postbody_text() and http_postbody_bytes() to
have become http_body_text() and http_body_bytes().
The developer is still responsible for validating the method their
page handler is called with. Hopefully this becomes a configuration
option soon enough.
Instead of letting http_requests spin, if we cannot allocate
a connection for the request we will queue them up put them to sleep.
When a connection becomes available, we'll wake up a request that
was waiting for a connection and let it continue.
This completely avoids consuming massive amounts of cpu time
when dealing with thousands of requests waiting for a pgsql
worker to become ready.
Gone is the ugly KORE_PGSQL macro that hid an overly complex
state machine for the pgsql api.
Gone is the pgsql array that was attached to http_requests.
Gone are the callback hacks inside the pgsql api.
Instead, I strongly encourage people to use the new state machine
api Kore offers to properly deal with asynchronous queries.
The pgsql example in examples/pgsql has been updated to reflect
these changes.
In order to use this, define states for your page handler:
struct http_state mystates[] = {
{ "PAGE_STATE_INIT", page_init },
{ "PAGE_STATE_RESULT", page_result },
};
In your page handler you can then simply call http_state_run() with
your states and http_request. This will cause Kore to start calling
your state callbacks beginning at index 0.
State callbacks have the same prototype as page handlers:
int func(struct http_request *);
However, unlike page handlers they MUST return one of the following:
- HTTP_STATE_OK: All good, just continue the fsm.
- HTTP_STATE_ERROR: Abort fsm and return KORE_RESULT_OK to Kore
(This will cancel the http request).
- HTTP_STATE_RETRY: Return KORE_RESULT_RETRY to Kore.
(Kore will retry your page handler next event loop).
- HTTP_STATE_COMPLETE: The fsm completed, break out cleanly.
Note that using this is completely optional and you can still
use the traditional way of writing page handlers.
The fsm is designed to get rid of the clutter that exists today
in Kore when dealing with non blocking tasks or pgsql calls.
This way we can get our code called whenever a stream is
completed. This cb handler does stand alone from an http_request
and is passed a netbuf data structure.
* Always make sure we end the stream properly
* Check for SPDY_FLOW_WINDOW_MAX on window frame updates
* Kill SPDY_STREAM_BLOCKING, once flow control kicks in its per session
These 2 functions can be used to move an HTTP request
from/to the active http_requests list. Effectively
putting them to "sleep" or "waking them up".
Sprinkle this through the pgsql and task code.
If used correctly greatly reduces overhead for
managing sleeping tasks.
Synchronize access to state/result properly so one
can access these from inside the task as well.
Introduce KORE_TASK_STATE_ABORT which will be set
when a task needs to be abort. You can use this
to create tasks that run in a loop until aborted.
Instead if a task is used from inside a request
you MUST call kore_task_bind_request() on it.
This way we can move forward for tasks that
don't belong to page handlers.
Also, some bug fixes for removing http_requests
that are indeed linked to a currently running task.
Tasks are now assigned to available threads instead
of a global task list.
You can now pass messages between your page handler
and the created task using the kore_task_channel_*
functions.
Only one task per time can be assigned to a request
but I feel this is probably a bad design choice.
Preferably we'd want to be able to start tasks
regardless of being in a page handler or not,
this not only ads flexibility but seems like
a better choice overall as it opens a lot more
possibilities about how tasks can be used.
Don't wait for a full event loop until we call the page handler
for a received pgsql result. This speeds up page loads using
KORE_PGSQL by quite a lot, especially on a non busy server.
Including but not limited to:
- Correctly use PQerrorMessage() in case we cleanup with PQfinish
- If we get a network error, cleanup the connection
- No longer call the page handler from inside kore_pgsql_handle()
but instead just put it to sleep in case we don't need it.
This does grow the http_requests list quite a bit with sleeping
connections and can perhaps be improved later on.
- Allow us to on error return OK from a page handler from inside
the completetion block for KORE_PGSQL().
- Count the cummulative time for a request to finish instead
of the latest run time for the handler.
Has support for full async pgsql queries. Most of the logic
is hidden behind a KORE_PGSQL() macro allowing you to insert
these pgsql calls in your page handlers without blocking the
kore worker while the query is going off.
There is place for improvement here, and perhaps KORE_PGSQL won't
stay as I feel this might overcomplicate things instead of making
them simpler as I thought it would.
Using authentication blocks one can define "authentication" mechanisms
in Kore for page handlers.
This can be used to require a session cookie (validated by your own validator)
for certain page handlers, and hopefully in the future provide a framework
for adding more authentication things (like HTTP Auth).
Right now only cookie checking is available.
- Parameter validation is now done only when http_process_*()
is called and upon http_argument_add().
- You MUST have defined your params in a param block or they will
be filtered out.
- http_argument_lookup() is dead, welcome http_argument_get() and
its brothers and sisters:
http_argument_get_string()
http_argument_get_uint16()
http_argument_get_int16()
http_argument_get_uint32()
http_argument_get_int32()
They will automatically do bounds checking on integers for you
and return proper integers or a NUL-terminated string.
- The http_argument_get* functions no longer create an additional
copy of the string which you need to free. Easier going.
- http_multiple_args() is dead, byebye
- Make some stuff we don't want to share with the modules static.
- Attempt to chain as much as we can in the send netbufs
(keeps down the SSL_write calls, silly seeing it go out with 8 bytes)
- Change NETBUF_SEND_PAYLOAD_MAX to 4K
- Call SSL_write() with max NETBUF_SEND_PAYLOAD_MAX in size
- Go back to flushing the send buffers after each request
- No more need for a fixed pool for nb->buf, go back to the heap for now
- Disable Nagle, we're doing the chaining now anyway
No longer takes callbacks, flags, or *out arguments.
Update rest of the code that called these callbacks whenever sending
was completed, instead call them right away now.
Allows you to configure maximum amount of seconds an HTTP connection
can stay open (does not affect SPDY connections). If set to 0 it will
disable keep-alive all together.
Add some inttypes fluff.