wireprotov2: define type to represent pre-encoded object An upcoming commit will introduce a caching layer to command serving. This will require the ability to cache pre-encoded data. This commit introduces a type to represent pre-encoded data and teaches the output layer to not CBOR encode an instance of that type. Differential Revision: https://phab.mercurial-scm.org/D4772

wireprotov2: change name and behavior of readframe() In the near future, we will want to support performing I/O from other sources. Let's rename readframe() to readdata() and tweak its logic to support future growth. Differential Revision: https://phab.mercurial-scm.org/D4771

url: move _wraphttpresponse() from httpeer This is a generally useful function. Having it on the url module will make it more accessible outside of the HTTP peers. Differential Revision: https://phab.mercurial-scm.org/D4770

debugcommands: print all CBOR objects application/mercurial-cbor may contain multiple objects. Let's print all of them. Differential Revision: https://phab.mercurial-scm.org/D4769

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storageutil: pass nodes into emitrevisions() The main emitrevisions() uses nodes. So it makes sense to use nodes for the helper API. Not bothering with API since this function was introduced a few commits ago. Differential Revision: https://phab.mercurial-scm.org/D4805

storageutil: make all callables optional Not all storage backends may implement these callables. That's part of the reason these methods aren't exposed on the storage interface. Differential Revision: https://phab.mercurial-scm.org/D4804

storageutil: extract most of emitrevisions() to standalone function As part of implementing a storage backend, I found myself copying most of revlog.emitrevisions(). This code is highly nuanced and it bothered me greatly to be copying such low-level code. This commit extracts the bulk of revlog.emitrevisions() into a new standalone function. In order to make the function generally usable, all "self" function calls that aren't exposed on the ifilestorage interface are passed in via callable arguments. No meaningful behavior should have changed as part of the port. Upcoming commits will tweak behavior to make the code more generically usable. Differential Revision: https://phab.mercurial-scm.org/D4803

storageutil: invert logic of file data comparison IMO things make more sense when the function is explicitly a test for file data equivalence. Not bothering with API since the function was introduced by the previous commit. Differential Revision: https://phab.mercurial-scm.org/D4802

storageutil: extract filelog.cmp() to a standalone function As part of implementing an alternate storage backend, I found myself reimplementing this code. With a little massaging, we can extract filelog.cmp() to a standalone function. As part of this, the call to revlog.cmp() was inlined (it is just a 2-line function). I also tweaked some variable names to improve readability. I'll further tweak names in a subsequent commit. Differential Revision: https://phab.mercurial-scm.org/D4801

storageutil: extract copy metadata retrieval out of filelog As part of implementing an alternate storage backend, I found myself reinventing this wheel. Let's create a utility function for doing the work. Differential Revision: https://phab.mercurial-scm.org/D4800