branchcache: use update_disk to refresh 'served' and 'served.hidden'
The `update_disk` method is dedicated to this kind of usecase. Now that the writting patterns are more consistent, we can use it to warm these two important cache.
I am dropping the first comment about "refreshing all the others" because it is
false. If a branchmap already exist for "served", none of the subset will be
updated.
/**
* Copyright (c) 2018-present, Gregory Szorc
* All rights reserved.
*
* This software may be modified and distributed under the terms
* of the BSD license. See the LICENSE file for details.
*/
#include "python-zstandard.h"
extern PyObject* ZstdError;
PyDoc_STRVAR(ZstdCompressionChunkerIterator__doc__,
"Iterator of output chunks from ZstdCompressionChunker.\n"
);
static void ZstdCompressionChunkerIterator_dealloc(ZstdCompressionChunkerIterator* self) {
Py_XDECREF(self->chunker);
PyObject_Del(self);
}
static PyObject* ZstdCompressionChunkerIterator_iter(PyObject* self) {
Py_INCREF(self);
return self;
}
static PyObject* ZstdCompressionChunkerIterator_iternext(ZstdCompressionChunkerIterator* self) {
size_t zresult;
PyObject* chunk;
ZstdCompressionChunker* chunker = self->chunker;
ZSTD_EndDirective zFlushMode;
if (self->mode != compressionchunker_mode_normal && chunker->input.pos != chunker->input.size) {
PyErr_SetString(ZstdError, "input should have been fully consumed before calling flush() or finish()");
return NULL;
}
if (chunker->finished) {
return NULL;
}
/* If we have data left in the input, consume it. */
while (chunker->input.pos < chunker->input.size) {
Py_BEGIN_ALLOW_THREADS
zresult = ZSTD_compressStream2(chunker->compressor->cctx, &chunker->output,
&chunker->input, ZSTD_e_continue);
Py_END_ALLOW_THREADS
/* Input is fully consumed. */
if (chunker->input.pos == chunker->input.size) {
chunker->input.src = NULL;
chunker->input.pos = 0;
chunker->input.size = 0;
PyBuffer_Release(&chunker->inBuffer);
}
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult));
return NULL;
}
/* If it produced a full output chunk, emit it. */
if (chunker->output.pos == chunker->output.size) {
chunk = PyBytes_FromStringAndSize(chunker->output.dst, chunker->output.pos);
if (!chunk) {
return NULL;
}
chunker->output.pos = 0;
return chunk;
}
/* Else continue to compress available input data. */
}
/* We also need this here for the special case of an empty input buffer. */
if (chunker->input.pos == chunker->input.size) {
chunker->input.src = NULL;
chunker->input.pos = 0;
chunker->input.size = 0;
PyBuffer_Release(&chunker->inBuffer);
}
/* No more input data. A partial chunk may be in chunker->output.
* If we're in normal compression mode, we're done. Otherwise if we're in
* flush or finish mode, we need to emit what data remains.
*/
if (self->mode == compressionchunker_mode_normal) {
/* We don't need to set StopIteration. */
return NULL;
}
if (self->mode == compressionchunker_mode_flush) {
zFlushMode = ZSTD_e_flush;
}
else if (self->mode == compressionchunker_mode_finish) {
zFlushMode = ZSTD_e_end;
}
else {
PyErr_SetString(ZstdError, "unhandled compression mode; this should never happen");
return NULL;
}
Py_BEGIN_ALLOW_THREADS
zresult = ZSTD_compressStream2(chunker->compressor->cctx, &chunker->output,
&chunker->input, zFlushMode);
Py_END_ALLOW_THREADS
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "zstd compress error: %s",
ZSTD_getErrorName(zresult));
return NULL;
}
if (!zresult && chunker->output.pos == 0) {
return NULL;
}
chunk = PyBytes_FromStringAndSize(chunker->output.dst, chunker->output.pos);
if (!chunk) {
return NULL;
}
chunker->output.pos = 0;
if (!zresult && self->mode == compressionchunker_mode_finish) {
chunker->finished = 1;
}
return chunk;
}
PyTypeObject ZstdCompressionChunkerIteratorType = {
PyVarObject_HEAD_INIT(NULL, 0)
"zstd.ZstdCompressionChunkerIterator", /* tp_name */
sizeof(ZstdCompressionChunkerIterator), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)ZstdCompressionChunkerIterator_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
ZstdCompressionChunkerIterator__doc__, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
ZstdCompressionChunkerIterator_iter, /* tp_iter */
(iternextfunc)ZstdCompressionChunkerIterator_iternext, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
PyType_GenericNew, /* tp_new */
};
PyDoc_STRVAR(ZstdCompressionChunker__doc__,
"Compress chunks iteratively into exact chunk sizes.\n"
);
static void ZstdCompressionChunker_dealloc(ZstdCompressionChunker* self) {
PyBuffer_Release(&self->inBuffer);
self->input.src = NULL;
PyMem_Free(self->output.dst);
self->output.dst = NULL;
Py_XDECREF(self->compressor);
PyObject_Del(self);
}
static ZstdCompressionChunkerIterator* ZstdCompressionChunker_compress(ZstdCompressionChunker* self, PyObject* args, PyObject* kwargs) {
static char* kwlist[] = {
"data",
NULL
};
ZstdCompressionChunkerIterator* result;
if (self->finished) {
PyErr_SetString(ZstdError, "cannot call compress() after compression finished");
return NULL;
}
if (self->inBuffer.obj) {
PyErr_SetString(ZstdError,
"cannot perform operation before consuming output from previous operation");
return NULL;
}
#if PY_MAJOR_VERSION >= 3
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:compress",
#else
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:compress",
#endif
kwlist, &self->inBuffer)) {
return NULL;
}
if (!PyBuffer_IsContiguous(&self->inBuffer, 'C') || self->inBuffer.ndim > 1) {
PyErr_SetString(PyExc_ValueError,
"data buffer should be contiguous and have at most one dimension");
PyBuffer_Release(&self->inBuffer);
return NULL;
}
result = (ZstdCompressionChunkerIterator*)PyObject_CallObject((PyObject*)&ZstdCompressionChunkerIteratorType, NULL);
if (!result) {
PyBuffer_Release(&self->inBuffer);
return NULL;
}
self->input.src = self->inBuffer.buf;
self->input.size = self->inBuffer.len;
self->input.pos = 0;
result->chunker = self;
Py_INCREF(result->chunker);
result->mode = compressionchunker_mode_normal;
return result;
}
static ZstdCompressionChunkerIterator* ZstdCompressionChunker_finish(ZstdCompressionChunker* self) {
ZstdCompressionChunkerIterator* result;
if (self->finished) {
PyErr_SetString(ZstdError, "cannot call finish() after compression finished");
return NULL;
}
if (self->inBuffer.obj) {
PyErr_SetString(ZstdError,
"cannot call finish() before consuming output from previous operation");
return NULL;
}
result = (ZstdCompressionChunkerIterator*)PyObject_CallObject((PyObject*)&ZstdCompressionChunkerIteratorType, NULL);
if (!result) {
return NULL;
}
result->chunker = self;
Py_INCREF(result->chunker);
result->mode = compressionchunker_mode_finish;
return result;
}
static ZstdCompressionChunkerIterator* ZstdCompressionChunker_flush(ZstdCompressionChunker* self, PyObject* args, PyObject* kwargs) {
ZstdCompressionChunkerIterator* result;
if (self->finished) {
PyErr_SetString(ZstdError, "cannot call flush() after compression finished");
return NULL;
}
if (self->inBuffer.obj) {
PyErr_SetString(ZstdError,
"cannot call flush() before consuming output from previous operation");
return NULL;
}
result = (ZstdCompressionChunkerIterator*)PyObject_CallObject((PyObject*)&ZstdCompressionChunkerIteratorType, NULL);
if (!result) {
return NULL;
}
result->chunker = self;
Py_INCREF(result->chunker);
result->mode = compressionchunker_mode_flush;
return result;
}
static PyMethodDef ZstdCompressionChunker_methods[] = {
{ "compress", (PyCFunction)ZstdCompressionChunker_compress, METH_VARARGS | METH_KEYWORDS,
PyDoc_STR("compress data") },
{ "finish", (PyCFunction)ZstdCompressionChunker_finish, METH_NOARGS,
PyDoc_STR("finish compression operation") },
{ "flush", (PyCFunction)ZstdCompressionChunker_flush, METH_VARARGS | METH_KEYWORDS,
PyDoc_STR("finish compression operation") },
{ NULL, NULL }
};
PyTypeObject ZstdCompressionChunkerType = {
PyVarObject_HEAD_INIT(NULL, 0)
"zstd.ZstdCompressionChunkerType", /* tp_name */
sizeof(ZstdCompressionChunker), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)ZstdCompressionChunker_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
ZstdCompressionChunker__doc__, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
ZstdCompressionChunker_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
PyType_GenericNew, /* tp_new */
};
void compressionchunker_module_init(PyObject* module) {
Py_SET_TYPE(&ZstdCompressionChunkerIteratorType, &PyType_Type);
if (PyType_Ready(&ZstdCompressionChunkerIteratorType) < 0) {
return;
}
Py_SET_TYPE(&ZstdCompressionChunkerType, &PyType_Type);
if (PyType_Ready(&ZstdCompressionChunkerType) < 0) {
return;
}
}