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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

Durham Goode - - Load All Authors

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      https://bz.mercurial-scm.org/672

      # 0-2-4

      #  \ \ \

      #   1-3-5

      #

      # rename in #1, content change in #4.

        $ hg init

        $ touch 1

        $ touch 2

        $ hg commit -Am init  # 0

        adding 1

        adding 2

        $ hg rename 1 1a

        $ hg commit -m rename # 1

        $ hg co -C 0

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ echo unrelated >> 2

        $ hg ci -m unrelated1 # 2

        created new head

        $ hg merge --debug 1

          searching for copies back to rev 1

          unmatched files in other:

           1a

          all copies found (* = to merge, ! = divergent, % = renamed and deleted):

           src: '1' -> dst: '1a' 

          checking for directory renames

        resolving manifests

         branchmerge: True, force: False, partial: False

         ancestor: 81f4b099af3d, local: c64f439569a9+, remote: c12dcd37c90a

         1: other deleted -> r

        removing 1

         1a: remote created -> g

        getting 1a

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg ci -m merge1 # 3

        $ hg co -C 2

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ echo hello >> 1

        $ hg ci -m unrelated2 # 4

        created new head

        $ hg co -C 3

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ hg merge -y --debug 4

          searching for copies back to rev 1

          unmatched files in local:

           1a

          all copies found (* = to merge, ! = divergent, % = renamed and deleted):

           src: '1' -> dst: '1a' *

          checking for directory renames

        resolving manifests

         branchmerge: True, force: False, partial: False

         ancestor: c64f439569a9, local: e327dca35ac8+, remote: 746e9549ea96

         preserving 1a for resolve of 1a

        starting 4 threads for background file closing (?)

         1a: local copied/moved from 1 -> m (premerge)

        picked tool ':merge' for 1a (binary False symlink False changedelete False)

        merging 1a and 1 to 1a

        my 1a@e327dca35ac8+ other 1@746e9549ea96 ancestor 1@c64f439569a9

         premerge successful

        0 files updated, 1 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg co -C 4

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ hg merge -y --debug 3

          searching for copies back to rev 1

          unmatched files in other:

           1a

          all copies found (* = to merge, ! = divergent, % = renamed and deleted):

           src: '1' -> dst: '1a' *

          checking for directory renames

        resolving manifests

         branchmerge: True, force: False, partial: False

         ancestor: c64f439569a9, local: 746e9549ea96+, remote: e327dca35ac8

         preserving 1 for resolve of 1a

        removing 1

        starting 4 threads for background file closing (?)

         1a: remote moved from 1 -> m (premerge)

        picked tool ':merge' for 1a (binary False symlink False changedelete False)

        merging 1 and 1a to 1a

        my 1a@746e9549ea96+ other 1a@e327dca35ac8 ancestor 1@c64f439569a9

         premerge successful

        0 files updated, 1 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

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				https://bz.mercurial-scm.org/672

				# 0-2-4
				# \ \ \
				# 1-3-5
				#
				# rename in #1, content change in #4.

				$ hg init

				$ touch 1
				$ touch 2
				$ hg commit -Am init # 0
				adding 1
				adding 2

				$ hg rename 1 1a
				$ hg commit -m rename # 1

				$ hg co -C 0
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ echo unrelated >> 2
				$ hg ci -m unrelated1 # 2
				created new head

				$ hg merge --debug 1
				searching for copies back to rev 1
				unmatched files in other:
				1a
				all copies found (* = to merge, ! = divergent, % = renamed and deleted):
				src: '1' -> dst: '1a'
				checking for directory renames
				resolving manifests
				branchmerge: True, force: False, partial: False
				ancestor: 81f4b099af3d, local: c64f439569a9+, remote: c12dcd37c90a
				1: other deleted -> r
				removing 1
				1a: remote created -> g
				getting 1a
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg ci -m merge1 # 3

				$ hg co -C 2
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ echo hello >> 1
				$ hg ci -m unrelated2 # 4
				created new head

				$ hg co -C 3
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ hg merge -y --debug 4
				searching for copies back to rev 1
				unmatched files in local:
				1a
				all copies found (* = to merge, ! = divergent, % = renamed and deleted):
				src: '1' -> dst: '1a' *
				checking for directory renames
				resolving manifests
				branchmerge: True, force: False, partial: False
				ancestor: c64f439569a9, local: e327dca35ac8+, remote: 746e9549ea96
				preserving 1a for resolve of 1a
				starting 4 threads for background file closing (?)
				1a: local copied/moved from 1 -> m (premerge)
				picked tool ':merge' for 1a (binary False symlink False changedelete False)
				merging 1a and 1 to 1a
				my 1a@e327dca35ac8+ other 1@746e9549ea96 ancestor 1@c64f439569a9
				premerge successful
				0 files updated, 1 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg co -C 4
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ hg merge -y --debug 3
				searching for copies back to rev 1
				unmatched files in other:
				1a
				all copies found (* = to merge, ! = divergent, % = renamed and deleted):
				src: '1' -> dst: '1a' *
				checking for directory renames
				resolving manifests
				branchmerge: True, force: False, partial: False
				ancestor: c64f439569a9, local: 746e9549ea96+, remote: e327dca35ac8
				preserving 1 for resolve of 1a
				removing 1
				starting 4 threads for background file closing (?)
				1a: remote moved from 1 -> m (premerge)
				picked tool ':merge' for 1a (binary False symlink False changedelete False)
				merging 1 and 1a to 1a
				my 1a@746e9549ea96+ other 1a@e327dca35ac8 ancestor 1@c64f439569a9
				premerge successful
				0 files updated, 1 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)