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[PATCH v3 19/44] refs: add a backend method structure with transaction functions

From
David Turner <dturner@twopensource.com>
Date
Oct 12, 2015, 21:51 UTC
Message-ID
<1444686725-27660-20-git-send-email-dturner@twopensource.com>
In-Reply-To
<1444686725-27660-1-git-send-email-dturner@twopensource.com>
From: Ronnie Sahlberg <sahlberg@google.com>

Add a ref structure for backend methods. Start by adding a method pointer for the transaction commit function.

Add a function set_refs_backend to switch between backends. The files based backend is the default.

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
 refs-be-files.c | 10 ++++++++--
 refs.c          | 30 ++++++++++++++++++++++++++++++
 refs.h          | 15 +++++++++++++++
 3 files changed, 53 insertions(+), 2 deletions(-)
diff --git a/refs-be-files.c b/refs-be-files.c
index 1308955..3050f1d 100644
--- a/refs-be-files.c
+++ b/refs-be-files.c
@@ -3225,8 +3225,8 @@ static int ref_update_reject_duplicates(struct string_list *refnames,
 	return 0;
 }
 
-int ref_transaction_commit(struct ref_transaction *transaction,
-			   struct strbuf *err)
+static int files_transaction_commit(struct ref_transaction *transaction,
+				    struct strbuf *err)
 {
 	int ret = 0, i;
 	int n = transaction->nr;
@@ -3612,3 +3612,9 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
 	unlock_ref(lock);
 	return -1;
 }
+
+struct ref_be refs_be_files = {
+	NULL,
+	"files",
+	files_transaction_commit,
+};
diff --git a/refs.c b/refs.c
index 25ad3b5..f930fe0 100644
--- a/refs.c
+++ b/refs.c
@@ -4,6 +4,29 @@
 #include "cache.h"
 #include "refs.h"
 #include "lockfile.h"
+/*
+ * We always have a files backend and it is the default.
+ */
+struct ref_be *the_refs_backend = &refs_be_files;
+/*
+ * List of all available backends
+ */
+struct ref_be *refs_backends = &refs_be_files;
+
+/*
+ * This function is used to switch to an alternate backend.
+ */
+int set_refs_backend(const char *name)
+{
+	struct ref_be *be;
+
+	for (be = refs_backends; be; be = be->next)
+		if (!strcmp(be->name, name)) {
+			the_refs_backend = be;
+			return 0;
+		}
+	return 1;
+}
 
 static int is_per_worktree_ref(const char *refname)
 {
@@ -985,3 +1008,10 @@ int ref_transaction_verify(struct ref_transaction *transaction,
 				      NULL, old_sha1,
 				      flags, NULL, err);
 }
+
+/* backend functions */
+int ref_transaction_commit(struct ref_transaction *transaction,
+			   struct strbuf *err)
+{
+	return the_refs_backend->transaction_commit(transaction, err);
+}
diff --git a/refs.h b/refs.h
index 4940ae9..419abf4 100644
--- a/refs.h
+++ b/refs.h
@@ -619,4 +619,19 @@ extern int reflog_expire(const char *refname, const unsigned char *sha1,
 			 reflog_expiry_cleanup_fn cleanup_fn,
 			 void *policy_cb_data);
 
+/* refs backends */
+typedef int ref_transaction_commit_fn(struct ref_transaction *transaction,
+				      struct strbuf *err);
+typedef void ref_transaction_free_fn(struct ref_transaction *transaction);
+
+struct ref_be {
+	struct ref_be *next;
+	const char *name;
+	ref_transaction_commit_fn *transaction_commit;
+};
+
+
+extern struct ref_be refs_be_files;
+int set_refs_backend(const char *name);
+
 #endif /* REFS_H */

-- 
2.4.2.644.g97b850b-twtrsrc
Previous: David TurnerNext: David Turner
Message 33 of 71 in “alternate refs backends”
  1. 00/44 alternate refs backendsDavid Turner, Oct 12, 2015
  2. 01/44 refs.c: create a public version of verify_refname_availableDavid Turner, Oct 12, 2015
  3. Michael HaggertyOct 13, 2015
  4. 02/44 refs: make repack_without_refs and is_branch publicDavid Turner, Oct 12, 2015
  5. Michael HaggertyOct 13, 2015
  6. Michael HaggertyOct 13, 2015
  7. David TurnerOct 13, 2015
  8. 03/44 refs-be-files.c: rename refs to refs-be-filesDavid Turner, Oct 12, 2015
  9. 04/44 refs.c: add a new refs.c file to hold all common refs codeDavid Turner, Oct 12, 2015
  10. 05/44 refs.c: move update_ref to refs.cDavid Turner, Oct 12, 2015
  11. Michael HaggertyOct 13, 2015
  12. David TurnerOct 13, 2015
  13. David TurnerOct 14, 2015
  14. 06/44 refs.c: move delete_ref and delete_refs to the common codeDavid Turner, Oct 12, 2015
  15. Michael HaggertyOct 13, 2015
  16. 07/44 refs.c: move read_ref_at to the common refs fileDavid Turner, Oct 12, 2015
  17. 08/44 refs.c: move the hidden refs functions to the common codeDavid Turner, Oct 12, 2015
  18. 09/44 refs.c: move dwim and friend functions to the common refs codeDavid Turner, Oct 12, 2015
  19. 10/44 refs.c: move warn_if_dangling_symref* to the common codeDavid Turner, Oct 12, 2015
  20. 11/44 refs.c: move read_ref, read_ref_full and ref_exists to the common codeDavid Turner, Oct 12, 2015
  21. 12/44 refs.c: move resolve_refdup to commonDavid Turner, Oct 12, 2015
  22. 13/44 refs.c: move check_refname_format to the common codeDavid Turner, Oct 12, 2015
  23. 14/44 refs.c: move is_branch to the common codeDavid Turner, Oct 12, 2015
  24. 15/44 refs.c: move prettify_refname to the common codeDavid Turner, Oct 12, 2015
  25. 16/44 refs.c: move ref iterators to the common codeDavid Turner, Oct 12, 2015
  26. Michael HaggertyOct 13, 2015
  27. 17/44 refs.c: move head_ref_namespaced to the common codeDavid Turner, Oct 12, 2015
  28. 18/44 refs: move transaction functions into common codeDavid Turner, Oct 12, 2015
  29. Michael HaggertyOct 13, 2015
  30. Michael HaggertyOct 13, 2015
  31. David TurnerOct 13, 2015
  32. David TurnerOct 13, 2015
  33. 19/44 refs: add a backend method structure with transaction functionsDavid Turner, Oct 12, 2015
  34. 19/44 refs-be-files.c: add a backend method structure with transaction functionsDavid Turner, Oct 12, 2015
  35. David TurnerOct 12, 2015
  36. Michael HaggertyOct 13, 2015
  37. David TurnerOct 13, 2015
  38. Michael HaggertyOct 13, 2015
  39. 20/44 refs-be-files.c: add methods for misc ref operationsDavid Turner, Oct 12, 2015
  40. Michael HaggertyOct 13, 2015
  41. 21/44 refs-be-files.c: add methods for the ref iteratorsDavid Turner, Oct 12, 2015
  42. 22/44 refs-be-files.c: add method for for_each_reftype_...David Turner, Oct 12, 2015
  43. 23/44 refs-be-files.c: add do_for_each_per_worktree_refDavid Turner, Oct 12, 2015
  44. 24/44 refs.c: move refname_is_safe to the common codeDavid Turner, Oct 12, 2015
  45. 25/44 refs.h: document make refname_is_safe and add it to headerDavid Turner, Oct 12, 2015
  46. Michael HaggertyOct 13, 2015
  47. Michael HaggertyOct 13, 2015
  48. David TurnerOct 13, 2015
  49. 26/44 refs.c: move copy_msg to the common codeDavid Turner, Oct 12, 2015
  50. Michael HaggertyOct 13, 2015
  51. 27/44 refs.c: move peel_object to the common codeDavid Turner, Oct 12, 2015
  52. Michael HaggertyOct 13, 2015
  53. 28/44 refs.c: move should_autocreate_reflog to common codeDavid Turner, Oct 12, 2015
  54. 29/44 refs.c: add ref backend init functionDavid Turner, Oct 12, 2015
  55. 30/44 refs.c: add methods for reflogDavid Turner, Oct 12, 2015
  56. 31/44 refs.c: add method for initial ref transaction commitDavid Turner, Oct 12, 2015
  57. 32/44 initdb: move safe_create_dir into common codeDavid Turner, Oct 12, 2015
  58. 33/44 refs.c: add method for initializing refs dbDavid Turner, Oct 12, 2015
  59. 34/44 refs-be-files.c: add method to rename refsDavid Turner, Oct 12, 2015
  60. 35/44 refs: make lock genericDavid Turner, Oct 12, 2015
  61. 36/44 refs: make files_log_ref_write functions publicDavid Turner, Oct 12, 2015
  62. 37/44 refs: break out a ref conflict checkDavid Turner, Oct 12, 2015
  63. Michael HaggertyOct 13, 2015
  64. David TurnerOct 13, 2015
  65. 38/44 refs: move duplicate check to common codeDavid Turner, Oct 12, 2015
  66. 39/44 refs: always handle non-normal refs in files backendDavid Turner, Oct 12, 2015
  67. 40/44 refs: allow ref backend to be set for cloneDavid Turner, Oct 12, 2015
  68. 41/44 refs: add register_refs_backendDavid Turner, Oct 12, 2015
  69. 42/44 introduce "extensions" form of core.repositoryformatversionDavid Turner, Oct 12, 2015
  70. 43/44 refs: add LMDB refs backendDavid Turner, Oct 12, 2015
  71. 44/44 refs: tests for db backendDavid Turner, Oct 12, 2015

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