thodg/libgit2/tests/filter/stream.c

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• Hash : feb0e022
  Author :
  Date : 2015-02-19T12:14:06
  

  tests: separate INVASIVE filesystem tests Introduce GITTEST_INVASIVE_FS_STRUCTURE for things that are invasive to your filesystem structure (like creating folders at your filesystem root) and GITTEST_INVASIVE_FS_SIZE for things that write lots of data.

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• tests/filter/stream.c

• #include "clar_libgit2.h"
  #include "posix.h"
  #include "blob.h"
  #include "filter.h"
  #include "buf_text.h"
  #include "git2/sys/filter.h"
  #include "git2/sys/repository.h"
  
  static git_repository *g_repo = NULL;
  
  static git_filter *create_compress_filter(void);
  static git_filter *compress_filter;
  
  void test_filter_stream__initialize(void)
  {
  	compress_filter = create_compress_filter();
  
  	cl_git_pass(git_filter_register("compress", compress_filter, 50));
  	g_repo = cl_git_sandbox_init("empty_standard_repo");
  }
  
  void test_filter_stream__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  	g_repo = NULL;
  
  	git_filter_unregister("compress");
  }
  
  #define CHUNKSIZE 10240
  
  struct compress_stream {
  	git_writestream parent;
  	git_writestream *next;
  	git_filter_mode_t mode;
  	char current;
  	size_t current_chunk;
  };
  
  static int compress_stream_write__deflated(struct compress_stream *stream, const char *buffer, size_t len)
  {
  	size_t idx = 0;
  
  	while (len > 0) {
  		size_t chunkremain, chunksize;
  
  		if (stream->current_chunk == 0)
  			stream->current = buffer[idx];
  
  		chunkremain = CHUNKSIZE - stream->current_chunk;
  		chunksize = min(chunkremain, len);
  
  		stream->current_chunk += chunksize;
  		len -= chunksize;
  		idx += chunksize;
  
  		if (stream->current_chunk == CHUNKSIZE) {
  			cl_git_pass(stream->next->write(stream->next, &stream->current, 1));
  			stream->current_chunk = 0;
  		}
  	}
  
  	return 0;
  }
  
  static int compress_stream_write__inflated(struct compress_stream *stream, const char *buffer, size_t len)
  {
  	char inflated[CHUNKSIZE];
  	size_t i, j;
  
  	for (i = 0; i < len; i++) {
  		for (j = 0; j < CHUNKSIZE; j++)
  			inflated[j] = buffer[i];
  
  		cl_git_pass(stream->next->write(stream->next, inflated, CHUNKSIZE));
  	}
  
  	return 0;
  }
  
  static int compress_stream_write(git_writestream *s, const char *buffer, size_t len)
  {
  	struct compress_stream *stream = (struct compress_stream *)s;
  
  	return (stream->mode == GIT_FILTER_TO_ODB) ?
  		compress_stream_write__deflated(stream, buffer, len) :
  		compress_stream_write__inflated(stream, buffer, len);
  }
  
  static int compress_stream_close(git_writestream *s)
  {
  	struct compress_stream *stream = (struct compress_stream *)s;
  	cl_assert_equal_i(0, stream->current_chunk);
  	stream->next->close(stream->next);
  	return 0;
  }
  
  static void compress_stream_free(git_writestream *stream)
  {
  	git__free(stream);
  }
  
  static int compress_filter_stream_init(
  	git_writestream **out,
  	git_filter *self,
  	void **payload,
  	const git_filter_source *src,
  	git_writestream *next)
  {
  	struct compress_stream *stream = git__calloc(1, sizeof(struct compress_stream));
  	cl_assert(stream);
  
  	GIT_UNUSED(self);
  	GIT_UNUSED(payload);
  
  	stream->parent.write = compress_stream_write;
  	stream->parent.close = compress_stream_close;
  	stream->parent.free = compress_stream_free;
  	stream->next = next;
  	stream->mode = git_filter_source_mode(src);
  
  	*out = (git_writestream *)stream;
  	return 0;
  }
  
  static void compress_filter_free(git_filter *f)
  {
  	git__free(f);
  }
  
  git_filter *create_compress_filter(void)
  {
  	git_filter *filter = git__calloc(1, sizeof(git_filter));
  	cl_assert(filter);
  
  	filter->version = GIT_FILTER_VERSION;
  	filter->attributes = "+compress";
  	filter->stream = compress_filter_stream_init;
  	filter->shutdown = compress_filter_free;
  
  	return filter;
  }
  
  static void writefile(const char *filename, size_t numchunks)
  {
  	git_buf path = GIT_BUF_INIT;
  	char buf[CHUNKSIZE];
  	size_t i = 0, j = 0;
  	int fd;
  
  	cl_git_pass(git_buf_joinpath(&path, "empty_standard_repo", filename));
  
  	fd = p_open(path.ptr, O_RDWR|O_CREAT, 0666);
  	cl_assert(fd >= 0);
  
  	for (i = 0; i < numchunks; i++) {
  		for (j = 0; j < CHUNKSIZE; j++) {
  			buf[j] = i % 256;
  		}
  
  		cl_git_pass(p_write(fd, buf, CHUNKSIZE));
  	}
  	p_close(fd);
  
  	git_buf_free(&path);
  }
  
  static void test_stream(size_t numchunks)
  {
  	git_index *index;
  	const git_index_entry *entry;
  	git_blob *blob;
  	struct stat st;
  	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
  
  	checkout_opts.checkout_strategy = GIT_CHECKOUT_FORCE;
  
  	cl_git_mkfile(
  		"empty_standard_repo/.gitattributes",
  		"* compress\n");
  
  	/* write a file to disk */
  	writefile("streamed_file", numchunks);
  
  	/* place it in the index */
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_index_add_bypath(index, "streamed_file"));
  	cl_git_pass(git_index_write(index));
  
  	/* ensure it was appropriately compressed */
  	cl_assert(entry = git_index_get_bypath(index, "streamed_file", 0));
  
  	cl_git_pass(git_blob_lookup(&blob, g_repo, &entry->id));
  	cl_assert_equal_i(numchunks, git_blob_rawsize(blob));
  
  	/* check the file back out */
  	cl_must_pass(p_unlink("empty_standard_repo/streamed_file"));
  	cl_git_pass(git_checkout_index(g_repo, index, &checkout_opts));
  
  	/* ensure it was decompressed */
  	cl_must_pass(p_stat("empty_standard_repo/streamed_file", &st));
  	cl_assert_equal_sz((numchunks * CHUNKSIZE), st.st_size);
  
  	git_index_free(index);
  	git_blob_free(blob);
  }
  
  /* write a 50KB file through the "compression" stream */
  void test_filter_stream__smallfile(void)
  {
  	test_stream(5);
  }
  
  /* optionally write a 500 MB file through the compression stream */
  void test_filter_stream__bigfile(void)
  {
  	if (!cl_getenv("GITTEST_INVASIVE_FS_SIZE"))
  		cl_skip();
  
  	test_stream(51200);
  }
  

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