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wireprotov2: implement commands as a generator of objects...

wireprotov2: implement commands as a generator of objects Previously, wire protocol version 2 inherited version 1's model of having separate types to represent the results of different wire protocol commands. As I implemented more powerful commands in future commits, I found I was using a common pattern of returning a special type to hold a generator. This meant the command function required a closure to do most of the work. That made logic flow more difficult to follow. I also noticed that many commands were effectively a sequence of objects to be CBOR encoded. I think it makes sense to define version 2 commands as generators. This way, commands can simply emit the data structures they wish to send to the client. This eliminates the need for a closure in command functions and removes encoding from the bodies of commands. As part of this commit, the handling of response objects has been moved into the serverreactor class. This puts the reactor in the driver's seat with regards to CBOR encoding and error handling. Having error handling in the function that emits frames is particularly important because exceptions in that function can lead to things getting in a bad state: I'm fairly certain that uncaught exceptions in the frame generator were causing deadlocks. I also introduced a dedicated error type for explicit error reporting in command handlers. This will be used in subsequent commits. There's still a bit of work to be done here, especially around formalizing the error handling "protocol." I've added yet another TODO to track this so we don't forget. Test output changed because we're using generators and no longer know we are at the end of the data until we hit the end of the generator. This means we can't emit the end-of-stream flag until we've exhausted the generator. Hence the introduction of 0-sized end-of-stream frames. Differential Revision: https://phab.mercurial-scm.org/D4472

Matt Harbison - - Load All Authors

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      Tests of the file helper tool

        $ f -h

        ?sage: f [options] [filenames] (glob)

        ?ptions: (glob)

          -h, --help            show this help message and exit

          -t, --type            show file type (file or directory)

          -m, --mode            show file mode

          -l, --links           show number of links

          -s, --size            show size of file

          -n NEWER, --newer=NEWER

                                check if file is newer (or same)

          -r, --recurse         recurse into directories

          -S, --sha1            show sha1 hash of the content

          --sha256              show sha256 hash of the content

          -M, --md5             show md5 hash of the content

          -D, --dump            dump file content

          -H, --hexdump         hexdump file content

          -B BYTES, --bytes=BYTES

                                number of characters to dump

          -L LINES, --lines=LINES

                                number of lines to dump

          -q, --quiet           no default output

        $ mkdir dir

        $ cd dir

        $ f --size

        size=0

        $ echo hello | f --md5 --size

        size=6, md5=b1946ac92492d2347c6235b4d2611184

        $ f foo

        foo: file not found

        $ echo foo > foo

        $ f foo

        foo:

        $ f --sha1 foo

        foo: sha1=f1d2d2f924e986ac86fdf7b36c94bcdf32beec15

        $ f --sha256 foo

        foo: sha256=b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c

      #if symlink

        $ f foo --mode

        foo: mode=644

      #endif

      #if no-windows

        $ $PYTHON $TESTDIR/seq.py 10 > bar

      #else

      Convert CRLF -> LF for consistency

        $ $PYTHON $TESTDIR/seq.py 10 | sed "s/$//" > bar

      #endif

      #if unix-permissions symlink

        $ chmod +x bar

        $ f bar --newer foo --mode --type --size --dump --links --bytes 7

        bar: file, size=21, mode=755, links=1, newer than foo

        >>>

        1

        2

        3

        4

        <<< no trailing newline

      #endif

      #if unix-permissions

        $ ln bar baz

        $ f bar -n baz -l --hexdump -t --sha1 --lines=9 -B 20

        bar: file, links=2, newer than baz, sha1=612ca68d0305c821750a

        0000: 31 0a 32 0a 33 0a 34 0a 35 0a 36 0a 37 0a 38 0a |1.2.3.4.5.6.7.8.|

        0010: 39 0a                                           |9.|

        $ rm baz

      #endif

      #if unix-permissions symlink

        $ ln -s yadda l

        $ f . --recurse -MStmsB4

        .: directory with 3 files, mode=755

        ./bar: file, size=21, mode=755, md5=3b03, sha1=612c

        ./foo: file, size=4, mode=644, md5=d3b0, sha1=f1d2

        ./l: link, size=5, md5=2faa, sha1=af93

      #endif

        $ f --quiet bar -DL 3

        1

        2

        3

        $ cd ..

      Yadda is a symlink

        $ f -qr dir -HB 17

        dir: directory with 3 files (symlink !)

        dir: directory with 2 files (no-symlink !)

        dir/bar:

        0000: 31 0a 32 0a 33 0a 34 0a 35 0a 36 0a 37 0a 38 0a |1.2.3.4.5.6.7.8.|

        0010: 39                                              |9|

        dir/foo:

        0000: 66 6f 6f 0a                                     |foo.|

        dir/l: (symlink !)

        0000: 79 61 64 64 61                                  |yadda| (symlink !)

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				Tests of the file helper tool

				$ f -h
				?sage: f [options] [filenames] (glob)

				?ptions: (glob)
				-h, --help show this help message and exit
				-t, --type show file type (file or directory)
				-m, --mode show file mode
				-l, --links show number of links
				-s, --size show size of file
				-n NEWER, --newer=NEWER
				check if file is newer (or same)
				-r, --recurse recurse into directories
				-S, --sha1 show sha1 hash of the content
				--sha256 show sha256 hash of the content
				-M, --md5 show md5 hash of the content
				-D, --dump dump file content
				-H, --hexdump hexdump file content
				-B BYTES, --bytes=BYTES
				number of characters to dump
				-L LINES, --lines=LINES
				number of lines to dump
				-q, --quiet no default output

				$ mkdir dir
				$ cd dir

				$ f --size
				size=0

				$ echo hello \| f --md5 --size
				size=6, md5=b1946ac92492d2347c6235b4d2611184

				$ f foo
				foo: file not found

				$ echo foo > foo
				$ f foo
				foo:

				$ f --sha1 foo
				foo: sha1=f1d2d2f924e986ac86fdf7b36c94bcdf32beec15

				$ f --sha256 foo
				foo: sha256=b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c

				#if symlink
				$ f foo --mode
				foo: mode=644
				#endif

				#if no-windows
				$ $PYTHON $TESTDIR/seq.py 10 > bar
				#else
				Convert CRLF -> LF for consistency
				$ $PYTHON $TESTDIR/seq.py 10 \| sed "s/$//" > bar
				#endif

				#if unix-permissions symlink
				$ chmod +x bar
				$ f bar --newer foo --mode --type --size --dump --links --bytes 7
				bar: file, size=21, mode=755, links=1, newer than foo
				>>>
				1
				2
				3
				4
				<<< no trailing newline
				#endif

				#if unix-permissions
				$ ln bar baz
				$ f bar -n baz -l --hexdump -t --sha1 --lines=9 -B 20
				bar: file, links=2, newer than baz, sha1=612ca68d0305c821750a
				0000: 31 0a 32 0a 33 0a 34 0a 35 0a 36 0a 37 0a 38 0a \|1.2.3.4.5.6.7.8.\|
				0010: 39 0a \|9.\|
				$ rm baz
				#endif

				#if unix-permissions symlink
				$ ln -s yadda l
				$ f . --recurse -MStmsB4
				.: directory with 3 files, mode=755
				./bar: file, size=21, mode=755, md5=3b03, sha1=612c
				./foo: file, size=4, mode=644, md5=d3b0, sha1=f1d2
				./l: link, size=5, md5=2faa, sha1=af93
				#endif

				$ f --quiet bar -DL 3
				1
				2
				3

				$ cd ..

				Yadda is a symlink
				$ f -qr dir -HB 17
				dir: directory with 3 files (symlink !)
				dir: directory with 2 files (no-symlink !)
				dir/bar:
				0000: 31 0a 32 0a 33 0a 34 0a 35 0a 36 0a 37 0a 38 0a \|1.2.3.4.5.6.7.8.\|
				0010: 39 \|9\|
				dir/foo:
				0000: 66 6f 6f 0a \|foo.\|
				dir/l: (symlink !)
				0000: 79 61 64 64 61 \|yadda\| (symlink !)