upstream/mercurial-mirror Files · mercurial/mpatch.h

exchangev2: fetch manifest revisions...

exchangev2: fetch manifest revisions Now that the server has support for retrieving manifest data, we can implement the client bits to call it. We teach the changeset fetching code to capture the manifest revisions that are encountered on incoming changesets. We then feed this into a new function which filters out known manifests and then batches up manifest data requests to the server. This is different from the previous wire protocol in a few notable ways. First, the client fetches manifest data separately and explicitly. Before, we'd ask the server for data pertaining to some changesets (via a "getbundle" command) and manifests (and files) would be sent automatically. Providing an API for looking up just manifest data separately gives clients much more flexibility for manifest management. For example, a client may choose to only fetch manifest data on demand instead of prefetching it (i.e. partial clone). Second, we send N commands to the server for manifest retrieval instead of 1. This property has a few nice side-effects. One is that the deterministic nature of the requests lends itself to server-side caching. For example, say the remote has 50,000 manifests. If the server is configured to cache responses, each time a new commit arrives, you will have a cache miss and need to regenerate all outgoing data. But if you makes N requests requesting 10,000 manifests each, a new commit will still yield cache hits on the initial, unchanged manifest batches/requests. A derived benefit from these properties is that resumable clone is conceptually simpler to implement. When making a monolithic request for all of the repository data, recovering from an interrupted clone is hard because the server was in the driver's seat and was maintaining state about all the data that needed transferred. With the client driving fetching, the client can persist the set of unfetched entities and retry/resume a fetch if something goes wrong. Or we can fetch all data N changesets at a time and slowly build up a repository. This approach is drastically easier to implement when we have server APIs exposing low-level repository primitives (such as manifests and files). We don't yet support tree manifests. But it should be possible to implement that with the existing wire protocol command. Differential Revision: https://phab.mercurial-scm.org/D4489

Augie Fackler - - Load All Authors

File last commit:

r34801:76135583 default


                r39674:d292328e

default

Download file

             mpatch.h
        
                    26 lines
            
             | 717 B
            
                | text/x-c
            
             |
                CLexer
            
             / mercurial / mpatch.h
          
                    History
                
                 |
                  Source
                 | Raw
                 |Copy content
                 |Copy permalink

        Maciej Fijalkowski
    
mpatch: split mpatch into two files

              r29693
            
      #ifndef _HG_MPATCH_H_

      #define _HG_MPATCH_H_

        Maciej Fijalkowski
    
mpatch: remove dependency on Python.h in mpatch.c...

              r29694
            
      #define MPATCH_ERR_NO_MEM -3

      #define MPATCH_ERR_CANNOT_BE_DECODED -2

      #define MPATCH_ERR_INVALID_PATCH -1

        Maciej Fijalkowski
    
mpatch: split mpatch into two files

              r29693
            
      struct mpatch_frag {

      	int start, end, len;

      	const char *data;

      };

      struct mpatch_flist {

      	struct mpatch_frag *base, *head, *tail;

      };

        Augie Fackler
    
mpatch: reformat function prototypes with clang-format...

              r34801
            
      int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res);

        Maciej Fijalkowski
    
mpatch: split mpatch into two files

              r29693
            
      ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l);

      void mpatch_lfree(struct mpatch_flist *a);

      int mpatch_apply(char *buf, const char *orig, ssize_t len,

        Augie Fackler
    
mpatch: reformat function prototypes with clang-format...

              r34801
            
                       struct mpatch_flist *l);

      struct mpatch_flist *

      mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t),

                  ssize_t start, ssize_t end);

        Maciej Fijalkowski
    
mpatch: split mpatch into two files

              r29693
            
      #endif

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

Maciej Fijalkowski mpatch: split mpatch into two files	r29693	#ifndef _HG_MPATCH_H_
		#define _HG_MPATCH_H_

Maciej Fijalkowski mpatch: remove dependency on Python.h in mpatch.c...	r29694	#define MPATCH_ERR_NO_MEM -3
		#define MPATCH_ERR_CANNOT_BE_DECODED -2
		#define MPATCH_ERR_INVALID_PATCH -1

Maciej Fijalkowski mpatch: split mpatch into two files	r29693	struct mpatch_frag {
		int start, end, len;
		const char *data;
		};

		struct mpatch_flist {
		struct mpatch_frag base, head, *tail;
		};

Augie Fackler mpatch: reformat function prototypes with clang-format...	r34801	int mpatch_decode(const char bin, ssize_t len, struct mpatch_flist *res);
Maciej Fijalkowski mpatch: split mpatch into two files	r29693	ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l);
		void mpatch_lfree(struct mpatch_flist *a);
		int mpatch_apply(char buf, const char orig, ssize_t len,
Augie Fackler mpatch: reformat function prototypes with clang-format...	r34801	struct mpatch_flist *l);
		struct mpatch_flist *
		mpatch_fold(void bins, struct mpatch_flist (get_next_item)(void , ssize_t),
		ssize_t start, ssize_t end);
Maciej Fijalkowski mpatch: split mpatch into two files	r29693
		#endif