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Found by Coverity (CID 349456).
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This closes #312 issue on GitHub.
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One small step to Go modules support.
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Each request references the router process structure that owns all memory
maps. The process structure has a reference counter; each request increases
the counter to lock the structure in memory until request processing ends.
Incoming and outgoing buffers reference memory maps that the process owns,
so the process structure should be released only when all buffers are
released to avoid invalid memory access and a crash.
This describes the libunit library mechanism used for application processes.
The background of this issue is as follows:
The issue was found on buildbot when the router crashed during Java
websocket tests. The Java application receives a notification from the
master process; when the notification is processed, libunit deletes the
process structure from its process hash and decrements the use counter;
however, active websocket connections maintain their use counts on the
process structure. After that, when the master process is stopping the
application, libunit releases active websocket connections. At this point,
it's important to release the connections' memory buffers before the
corresponding process structure and all shared memory segments are released.
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To pass Go object references to C and back we use hack with casting to
unsafe and then to uintptr. However, we should not store such references
because Go not guaratnee it will be available by the same address.
Introducing map with integer key helps to avoid dereference stored address.
This closes #253 and #309 issues on GitHub.
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One alert per failed allocation is enough.
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By design, Unit context is created for the thread which reads messages from
the router. However, Go request handlers are called in a separate goroutine
that may be executed in a different thread. To avoid a racing condition,
access to lists of free structures in the context should be serialized. This
patch should fix random crashes in Go applications under high load.
This is related to #253 and #309 issues on GitHub.
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Example:
PUT/POST/DELETE /config/listeners/unix:%2Fpath%2Fto%2Fsocket
This follows a49ee872e83d.
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In theory, all space characters in request target must be encoded; however,
some clients may violate the specification. For the sake of interoperability,
Unit supports unencoded space characters.
Previously, if there was a space character before the extension or arguments
parts, those parts weren't recognized. Also, quoted symbols and complex
target weren't detected after a space character.
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Thanks to 洪志道 (Hong Zhi Dao).
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Now URI encoding can be used to escape "/" in the request path:
GET /config/listeners/unix:%2Fpath%2Fto%2Fsocket/
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The "nxt_http_websocket" request state, defined in "nxt_http_websocket.c",
is used in "nxt_router.c" and must be linked with external symbol declared
in "nxt_router.c".
Due to the missing "extern" keyword, building Unit with some linkers
(notably gold and LLD) caused WebSocket connections to get stuck or even
crash the router process.
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Request state ready_handler required for further websocket events processing.
It is not required for regular response transferring.
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Fields are filtered one by one before being added to fields list.
This avoids adding and then skipping connection-specific fields.
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- nxt_req_app_link_t -> nxt_request_app_link_t
- nxt_req_conn_link_t -> nxt_request_rpc_data_t
Corresponding abbreviated field names also changed:
- ra -> req_app_link
- rc -> req_rpc_data
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This closes #265 issue on GitHub.
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Now it's possible to delete "listeners" and "applications" objects.
This closes #187 issue on GitHub.
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In Node.js version 11.10.0 and later, the writeHead() function returns "this".
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Scheme matches exact string “http” or “https”.
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Some Perl compile options affects ABI and not using them while compiling
our module resulted in non-working build.
Notably on 32-bit Debian 10, Perl is built with -D_FILE_OFFSET_BITS=64
and our module after being compiled without this option caused segmentation
faults in unexpected places.
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There's no reason to parse "http_status_line"; the PHP interpreter already
does this. If the line contains a valid status code, it's assigned to
"http_response_code".
This also fixes invalid status line handling, where the nxt_int_parse()
function returned -1; it was cast to unsigned, yielding response code 65535.
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Before this fix, request in router may hang until timeout expired if
application crashed during request processing.
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All allocated blocks for lvlhash required to be aligned because lower
address bits used for various extra information. Using unaligned blocks
may cause invalid memory aceess.
This was issue found on buildbot running large configuration tests.
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File nxt_napi.h (introduced in 53533ba0097c) added into packaged files
list.
This closes #261 issue on GitHub.
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