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odb: Add GIT_EPASSTHROUGH

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Allows a custom user backend to passthrough one of the callbacks. Used
for e.g. caching backends.
This commit is contained in:
Vicent Marti 2011-06-19 12:48:16 +02:00
parent bfd5e3e2a2
commit 984ed6b6be
2 changed files with 28 additions and 17 deletions
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3
include/git2/errors.h
View File

@ -122,6 +122,9 @@ typedef enum {
/** The given short oid is ambiguous */
GIT_EAMBIGUOUSOIDPREFIX = -29,
/** Skip and passthrough the given ODB backend */
GIT_EPASSTHROUGH = -30,
} git_error;
/**

32
src/odb.c
View File

@ -455,6 +455,9 @@ int git_odb_read_header(size_t *len_p, git_otype *type_p, git_odb *db, const git
error = b->read_header(len_p, type_p, b, id);
}
if (error == GIT_EPASSTHROUGH)
return GIT_SUCCESS;
/*
* no backend could read only the header.
* try reading the whole object and freeing the contents
@ -491,13 +494,12 @@ int git_odb_read(git_odb_object **out, git_odb *db, const git_oid *id)
error = b->read(&raw.data, &raw.len, &raw.type, b, id);
}
if (error == GIT_SUCCESS) {
if (error == GIT_EPASSTHROUGH || error == GIT_SUCCESS) {
*out = git_cache_try_store(&db->cache, new_odb_object(id, &raw));
return GIT_SUCCESS;
}
if (error < GIT_SUCCESS)
return git__rethrow(error, "Failed to read object");
return error;
}
int git_odb_read_prefix(git_odb_object **out, git_odb *db, const git_oid *short_id, unsigned int len)
@ -533,6 +535,7 @@ int git_odb_read_prefix(git_odb_object **out, git_odb *db, const git_oid *short_
found++;
break;
case GIT_ENOTFOUND:
case GIT_EPASSTHROUGH:
break;
case GIT_EAMBIGUOUSOIDPREFIX:
return git__rethrow(error, "Failed to read object. Ambiguous sha1 prefix");
@ -557,6 +560,7 @@ int git_odb_write(git_oid *oid, git_odb *db, const void *data, size_t len, git_o
{
unsigned int i;
int error = GIT_ERROR;
git_odb_stream *stream;
assert(oid && db);
@ -572,21 +576,21 @@ int git_odb_write(git_oid *oid, git_odb *db, const void *data, size_t len, git_o
error = b->write(oid, b, data, len, type);
}
if (error == GIT_EPASSTHROUGH || error == GIT_SUCCESS)
return GIT_SUCCESS;
/* if no backends were able to write the object directly, we try a streaming
* write to the backends; just write the whole object into the stream in one
* push */
if (error < GIT_SUCCESS) {
git_odb_stream *stream;
if ((error = git_odb_open_wstream(&stream, db, len, type)) == GIT_SUCCESS) {
stream->write(stream, data, len);
error = stream->finalize_write(oid, stream);
stream->free(stream);
}
return GIT_SUCCESS;
}
return (error == GIT_SUCCESS) ? GIT_SUCCESS :
git__rethrow(error, "Failed to write object");
return git__rethrow(error, "Failed to write object");
}
int git_odb_open_wstream(git_odb_stream **stream, git_odb *db, size_t size, git_otype type)
@ -610,8 +614,10 @@ int git_odb_open_wstream(git_odb_stream **stream, git_odb *db, size_t size, git_
error = init_fake_wstream(stream, b, size, type);
}
return (error == GIT_SUCCESS) ? GIT_SUCCESS :
git__rethrow(error, "Failed to open write stream");
if (error == GIT_EPASSTHROUGH || error == GIT_SUCCESS)
return GIT_SUCCESS;
return git__rethrow(error, "Failed to open write stream");
}
int git_odb_open_rstream(git_odb_stream **stream, git_odb *db, const git_oid *oid)
@ -629,7 +635,9 @@ int git_odb_open_rstream(git_odb_stream **stream, git_odb *db, const git_oid *oi
error = b->readstream(stream, b, oid);
}
return (error == GIT_SUCCESS) ? GIT_SUCCESS :
git__rethrow(error, "Failed to open read stream");
if (error == GIT_EPASSTHROUGH || error == GIT_SUCCESS)
return GIT_SUCCESS;
return git__rethrow(error, "Failed to open read stream");
}