Since new roles may be incompatible with http, add support for
alpn names at the role struct, automatic generation of the
default list of alpn names that servers advertise, and the
ability to override the used alpn names per-vhost and per-
client connection.
This not only lets you modulate visibility or use of h2,
but also enables vhosts that only offer non-http roles,
as well as restricting http role vhosts to only alpn
identifiers related to http roles.
By itself the HTTP layer can track transaction sizes only with
content-length, including on POST.
However it's also possible for whatever logically interprets
the payload to determine its length, for example with multipart,
the multipart headers can do that job.
This allows the spa stuff to drive the content length tracking,
so lws can interpret multipart POST client payload without needing
an overall content-length.
This adds h2 http support for the client api.
The public client api requires no changes, it will detect by
ALPN if the server can handle http/2, if so, it will use it.
Multiple client connections using the lws api will be mapped on
to the same single http/2 + tls socket using http/2 streams
that are serviced simultaneously where possible.
This completely removes the loop self-running stuff.
Static allocations (uv_idle, timers etc) are referenced-counted in the context
same as the wsi are. When lws wants to close, he first closes all his wsi, then
when that is completed in the uv close callbacks, he closes all of his static
uv handles. When that is also completed in the uv callbacks, he stops the loop
so the lws context can destroy and exit.
Any direct libuv allocations in protocol handlers must participate in the
reference counting. Two new apis are provided
- lws_libuv_static_refcount_add(handle, context) to mark the handle with
a pointer to the context and increment the global uv object counter
- lws_libuv_static_refcount_del() which should be used as the close callback
for your own libuv objects declared in the protocol scope.
Previously down network interfaces without an IPv4 address are
removed from the posix api that lists network interfaces.
That means if you bound a vhost listen socket to a particular
interface, it will fail at startup time.
This patch adds these vhosts to a list, starts the vhost without
a listen socket, and checks to see if the vhost's network interface
has appeared while the rest of lws is running.
If it appears, the listen socket is opened on the network interface
and the vhost becomes reachable.
This just supports "http/1.1" alpn and lets the client know it
can use keepalive earlier if it affirmitively negotiated
"http/1.1" on alpn.
mbedTLS wrapper needed a small adaptation to also allow
per-client-ssl control of the alpn negotiation list.
AG: unlike openssl, mbedtls does not load the system trust store.
So this change will make client tls operations that work OK on openssl fail on
mbedtls unless you provide the correct CA cert.
This allows lws to distinguish between untrusted CAs, hostname
mismatches, expired certificates.
NOTE: LCCSCF_ALLOW_SELFSIGNED actually allows for untrusted CAs, and
will also skip hostname verification. This is somewhat a limitiation of
the current lws verification process.
AG: improve error reporting up to the CLIENT_CONNECTION_ERROR argument
and add a note specific to mbedtls in the test client. Adapt the test
client to note the CA requirement if built with mbedTLS. Adapt the
minimal test clients to have the CAs available and use them if mbedTLS.
This replaces the existing, unreleased lws_set_timer(wsi, secs) with
lws_set_timer_usecs(wsi, usecs).
wsi with a timer waiting are added to a linked-list sorted by the
timer trigger time.
1) poll() timeout (ie, poll wait) is trimmed to the nearest ms of the
first waiting timer if the default poll wait is longer than the
interval until the first waiting timer.
The linked-list of waiting timers is checked every entry and exit
from poll()... if no timers waiting or none reached their time
this costs almost nothing.
2) libuv: the earliest hrtimer is checked after every IO, again this
is costing nothing if the list head is NULL. If the case there
are hrtimers on the list, it costs a getimeofday (a VDSO in linux)
and more only if any of the timers have fired.
In addition on entry to libuv idle, if there are any waiting hrtimers
on the list, a libuv timer is used to force a wake in case we stay
idle (the libuv timer has ms resolution).
3) libev: not implemented
4) libevent: not implemented
Warnings are logged in the api is used on an event backend without
support. Patches welcome to add support similarly to libuv.
