upstream/mercurial-mirror Files · mercurial/cext/charencode.h

exchangev2: support fetching shallow files history...

exchangev2: support fetching shallow files history This commit teaches the exchangev2 client code to handle fetching shallow files data. Only shallow fetching of files data is supported: shallow fetching of changeset and manifest data is explicitly not yet supported. Previously, we would fetch file revisions for changesets that were received by the current pull operation. In the new model, we calculate the set of "relevant" changesets given the pull depth and only fetch files data for those changesets. We also teach the "filesdata" command invocation to vary parameters as needed. The implementation here is far from complete or optimal. Subsequent pulls will end up re-fetching a lot of files data. But the application of this data should mostly be a no-op on the client, so it isn't a big deal. Depending on the order file revisions are fetched in, revisions could get inserted with the wrong revision number relationships. I think the best way to deal with this is to remove revision numbers from storage and to either dynamically derive them (by reconstructing a DAG from nodes/parents) or remove revision numbers from the file storage interface completely. A missing API that we'll likely want to write pretty soon is "ensure files for revision(s) are present." We can kind of cajole exchangev2.pull() to do this. But it isn't very efficient. For example, in simple cases like widening the store to obtain data for a single revision, it is probably more efficient to walk the manifest and find exactly which file revisions are missing and to make explicit requests for just their data. In more advanced cases, asking the server for all files data may be more efficient, even though it requires sending data the client already has. There is tons of room for future experimentation here. And TBH I'm not sure what the final state will be. Anyway, this commit gets us pretty close to being able to have shallow and narrow checkouts with exchangev2/sqlite storage. Close enough that a minimal extension should be able to provide fill in the gaps until the code in core stabilizes and there is a user-facing way to trigger the narrow/shallow bits from `hg clone` without also implying using of the narrow extension... Differential Revision: https://phab.mercurial-scm.org/D5169

Augie Fackler - - Load All Authors

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             charencode.h
        
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        Yuya Nishihara
    
cext: factor out header for charencode.c...

              r33753
            
      /*

       charencode.h - miscellaneous character encoding

       This software may be used and distributed according to the terms of

       the GNU General Public License, incorporated herein by reference.

      */

      #ifndef _HG_CHARENCODE_H_

      #define _HG_CHARENCODE_H_

      #include <Python.h>

      #include "compat.h"

      /* This should be kept in sync with normcasespecs in encoding.py. */

      enum normcase_spec {

      	NORMCASE_LOWER = -1,

      	NORMCASE_UPPER = 1,

      	NORMCASE_OTHER = 0

      };

        Yuya Nishihara
    
cext: modernize charencode.c to use Py_ssize_t

              r33754
            
      PyObject *unhexlify(const char *str, Py_ssize_t len);

        Yuya Nishihara
    
encoding: add function to test if a str consists of ASCII characters...

              r33927
            
      PyObject *isasciistr(PyObject *self, PyObject *args);

        Yuya Nishihara
    
cext: factor out header for charencode.c...

              r33753
            
      PyObject *asciilower(PyObject *self, PyObject *args);

      PyObject *asciiupper(PyObject *self, PyObject *args);

      PyObject *make_file_foldmap(PyObject *self, PyObject *args);

        Yuya Nishihara
    
encoding: add fast path of jsonescape() (issue5533)...

              r33926
            
      PyObject *jsonescapeu8fast(PyObject *self, PyObject *args);

        Yuya Nishihara
    
cext: factor out header for charencode.c...

              r33753
            
        Augie Fackler
    
charencode: adjust clang-format enable/disable comments...

              r36075
            
      /* clang-format off */

        Yuya Nishihara
    
cext: factor out header for charencode.c...

              r33753
            
      static const int8_t hextable[256] = {

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1, -1, -1, -1, -1, /* 0-9 */

      	-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* A-F */

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* a-f */

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

      	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1

      };

        Augie Fackler
    
charencode: adjust clang-format enable/disable comments...

              r36075
            
      /* clang-format on */

        Yuya Nishihara
    
cext: factor out header for charencode.c...

              r33753
            
      static inline int hexdigit(const char *p, Py_ssize_t off)

      {

      	int8_t val = hextable[(unsigned char)p[off]];

      	if (val >= 0) {

      		return val;

      	}

      	PyErr_SetString(PyExc_ValueError, "input contains non-hex character");

      	return 0;

      }

      #endif /* _HG_CHARENCODE_H_ */

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Yuya Nishihara cext: factor out header for charencode.c...	r33753	/*
		charencode.h - miscellaneous character encoding

		This software may be used and distributed according to the terms of
		the GNU General Public License, incorporated herein by reference.
		*/

		#ifndef _HG_CHARENCODE_H_
		#define _HG_CHARENCODE_H_

		#include <Python.h>
		#include "compat.h"

		/* This should be kept in sync with normcasespecs in encoding.py. */
		enum normcase_spec {
		NORMCASE_LOWER = -1,
		NORMCASE_UPPER = 1,
		NORMCASE_OTHER = 0
		};

Yuya Nishihara cext: modernize charencode.c to use Py_ssize_t	r33754	PyObject unhexlify(const char str, Py_ssize_t len);
Yuya Nishihara encoding: add function to test if a str consists of ASCII characters...	r33927	PyObject isasciistr(PyObject self, PyObject *args);
Yuya Nishihara cext: factor out header for charencode.c...	r33753	PyObject asciilower(PyObject self, PyObject *args);
		PyObject asciiupper(PyObject self, PyObject *args);
		PyObject make_file_foldmap(PyObject self, PyObject *args);
Yuya Nishihara encoding: add fast path of jsonescape() (issue5533)...	r33926	PyObject jsonescapeu8fast(PyObject self, PyObject *args);
Yuya Nishihara cext: factor out header for charencode.c...	r33753
Augie Fackler charencode: adjust clang-format enable/disable comments...	r36075	/* clang-format off */
Yuya Nishihara cext: factor out header for charencode.c...	r33753	static const int8_t hextable[256] = {
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /* 0-9 */
		-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* A-F */
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* a-f */
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
		};
Augie Fackler charencode: adjust clang-format enable/disable comments...	r36075	/* clang-format on */
Yuya Nishihara cext: factor out header for charencode.c...	r33753
		static inline int hexdigit(const char *p, Py_ssize_t off)
		{
		int8_t val = hextable[(unsigned char)p[off]];

		if (val >= 0) {
		return val;
		}

		PyErr_SetString(PyExc_ValueError, "input contains non-hex character");
		return 0;
		}

		#endif /* _HG_CHARENCODE_H_ */