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It's possible for the call to connect() to succeed on the very first
try, in which case the logic for checking for invalid timeout fields is
never executed. When this happens, the tests fail because they expect a
REDIS_ERR_IO but no such failure has occurred.
Tests aside, this is a potential source of irritating and hard-to-find
intermittent bugs.
This patch forces the validation to occur early so that we get
predictable behavior whenever an invalid timeout is specified.
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encountering defined constant 'unix' in GNU C environment (see commit d8145d79ce715054980938c751067ebaa541573c).
Not all code using hiredis can compile using '-std=c99', and/or not all users are able to easily make that change to the build process of various open-source projects, so it is more pragmatic to choose a different identifier that does not impose this requirement.
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Originally implemented by @abedra as part of #306.
In case a write or read times out, we force an error state, because we
can't guarantuee that the next read will get the right data.
Instead we need to reconnect to have a clean-state connection, which is
now easily possible with this method.
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The strerror_r API has two flavors depending on system options.
The bad flavor uses a static buffer for returning results, so if
you save the pointer from strerror_r, the string you're referencing
becomes useless if anybody else calls strerror_r again
The good flavor does what you expect: it writes the error to your buffer.
This commit uses strerror_r directly if it's a good version or copies
the static buffer into our private buffer if it's a bad version.
Thanks to gemorin for explaining the problem and drafting a fix.
Fixes #239
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Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>
[Instead of checking for "not solaris" we feature detect
for availability of what we want, then remove the system
that advertises compatability but doesn't actually provide it
(given our assumptions about what we're guarding).]
Closes #254
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[This introduces some new API functions.]
* Adds new flag to the connection context indicating SO_REUSEADDR
should be set.
* Adds max number of retries constant for when connect() hits
EADDRNOTAVAIL.
* Adds new function, redisAsyncConnectBindWithReuse(), letting
clients enable this functionality.
[Removed trailing whitespace in new header lines.]
Closes #264
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See antirez/redis#2012 for the leak causing unbounded memory growth.
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Solaris doesn't define the TCP options we try to set. Let's
ignore those under Solaris.
Closes #207
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Some environments require binding to specific source addresses instead
of letting the system determine which IP a connection should originate
from.
Closes #233
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redisCheckSocketError should only CheckSocketError and not
close any misbehaving sockets. If CheckSocketError discovers
a problem, the caller will discover the contest is in ERR
and will start destroying the context (which involves
finalizing all callbacks (which may still be using
fd for something, so we should not close fd until all
callbacks have been told we are failing) and eventually
close the fd in redisFree() immediately before the
context is released).
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With all the async connects and disconnects and error handling
going on in hiredis, we need to centralize how we close our fd
and set it so it doesn't get re-closed. Prior to this commit,
sometimes we'd close(fd), run an async error handler, then
call close(fd) again.
To stop multiple closes, we now set fd to -1 after we free it,
but that requires not passing fd as an independent argument to
functions.
This commit moves all fd usage to c->fd. Since the context
has a fd field and all functions receive the context, it makes
more sense to use the fd inside of c instead of passing along fd
as an independent argument.
Also, by only using c->fd, we can set c->fd after we close it to
signify we shouldn't re-close the same fd again.
This does change one semi-public interface function redisCheckSocketError()
to only take (context) instead of (context, fd). A search on github
returned zero occasions of people using redisCheckSocketError()
outside of net.{c,h} in hiredis itself.
Commit inspired by the bug report at:
https://groups.google.com/forum/#!topic/redis-db/mQm46XkIPOY
Thanks go out to Thijs for trying high-frequency reconnects on
a host that isn't there.
Closes #230
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redisContextConnectTcp() is now able to use IPv6 addresses if there is
no IPv4 address found resolving the specified hostname.
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The struct timeval argument in redisConnectWithTimeout(),
redisConnectUnixWithTimeout(), redisSetTimeout(),
redisContextSetTimeout(), redisContextConnectTcp()
and redisContextConnectUnix() is never modified and can
therefore be marked as const.
Signed-off-by: Noah Williamsson <noah.williamsson@gmail.com>
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Make Connection KeepAlive being optional instead of default.
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Keep client alive even though no command was sent to server for a long time.
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Closes #154
This commit properly sets the error value inside of
redisContextWaitReady when an invalid sec or usec value is provided.
Tests for each case are provided to demonstrate that the issue is
properly fixed and to avoid regression.
Signed-off-by: Aaron Bedra <aaron@aaronbedra.com>
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The current select() is limiting in instances where the fd num is > FD_SETSIZE.
Since redisContextWaitReady() only processes a single fd, select would still
fail.
For compatibility reasons I have converted select() over to poll(), eliminating
this problem.
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Use getaddrinfo
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If getaddrinfo(3) includes an AF_INET6 address before an AF_INET
address on a host with only IPv4 network connectivity then the
redisContextConnectTcp call would fail with "no route to host".
This commit fixes this issue by specifically handling the errno
EHOSTUNREACH error and entering another iteration of the addrinfo
loop. This will allow following AF_INET addresses to be attempted.
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Change redisContextConnectTcp() function to use getaddrinfo(3) to
perform address resolution, socket creation and connection. Resolved
addresses are limited to those reachable by the AF_INET family.
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Extract setting SO_REUSEADDR socket option into separate function
so the same code can be more easily used by redisCreateSocket and
other functions.
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