| #!/usr/bin/env python2.7 |
| |
| # Copyright 2017 gRPC authors. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import collections |
| import perfection |
| import sys |
| |
| _MAX_HEADER_LIST_SIZE = 16 * 1024 * 1024 |
| |
| Setting = collections.namedtuple('Setting', 'id default min max on_error') |
| OnError = collections.namedtuple('OnError', 'behavior code') |
| clamp_invalid_value = OnError('CLAMP_INVALID_VALUE', 'PROTOCOL_ERROR') |
| disconnect_on_invalid_value = lambda e: OnError('DISCONNECT_ON_INVALID_VALUE', e) |
| DecoratedSetting = collections.namedtuple('DecoratedSetting', |
| 'enum name setting') |
| |
| _SETTINGS = { |
| 'HEADER_TABLE_SIZE': |
| Setting(1, 4096, 0, 0xffffffff, clamp_invalid_value), |
| 'ENABLE_PUSH': |
| Setting(2, 1, 0, 1, disconnect_on_invalid_value('PROTOCOL_ERROR')), |
| 'MAX_CONCURRENT_STREAMS': |
| Setting(3, 0xffffffff, 0, 0xffffffff, |
| disconnect_on_invalid_value('PROTOCOL_ERROR')), |
| 'INITIAL_WINDOW_SIZE': |
| Setting(4, 65535, 0, 0x7fffffff, |
| disconnect_on_invalid_value('FLOW_CONTROL_ERROR')), |
| 'MAX_FRAME_SIZE': |
| Setting(5, 16384, 16384, 16777215, |
| disconnect_on_invalid_value('PROTOCOL_ERROR')), |
| 'MAX_HEADER_LIST_SIZE': |
| Setting(6, _MAX_HEADER_LIST_SIZE, 0, _MAX_HEADER_LIST_SIZE, |
| clamp_invalid_value), |
| 'GRPC_ALLOW_TRUE_BINARY_METADATA': |
| Setting(0xfe03, 0, 0, 1, clamp_invalid_value), |
| } |
| |
| H = open('src/core/ext/transport/chttp2/transport/http2_settings.h', 'w') |
| C = open('src/core/ext/transport/chttp2/transport/http2_settings.c', 'w') |
| |
| |
| # utility: print a big comment block into a set of files |
| def put_banner(files, banner): |
| for f in files: |
| print >> f, '/*' |
| for line in banner: |
| print >> f, ' * %s' % line |
| print >> f, ' */' |
| print >> f |
| |
| |
| # copy-paste copyright notice from this file |
| with open(sys.argv[0]) as my_source: |
| copyright = [] |
| for line in my_source: |
| if line[0] != '#': break |
| for line in my_source: |
| if line[0] == '#': |
| copyright.append(line) |
| break |
| for line in my_source: |
| if line[0] != '#': |
| break |
| copyright.append(line) |
| put_banner([H, C], [line[2:].rstrip() for line in copyright]) |
| |
| put_banner( |
| [H, C], |
| ["Automatically generated by tools/codegen/core/gen_settings_ids.py"]) |
| |
| print >> H, "#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HTTP2_SETTINGS_H" |
| print >> H, "#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HTTP2_SETTINGS_H" |
| print >> H |
| print >> H, "#include <stdint.h>" |
| print >> H, "#include <stdbool.h>" |
| print >> H |
| |
| print >> C, "#include \"src/core/ext/transport/chttp2/transport/http2_settings.h\"" |
| print >> C |
| print >> C, "#include <grpc/support/useful.h>" |
| print >> C, "#include \"src/core/lib/transport/http2_errors.h\"" |
| print >> C |
| |
| p = perfection.hash_parameters(sorted(x.id for x in _SETTINGS.values())) |
| print p |
| |
| |
| def hash(i): |
| i += p.offset |
| x = i % p.t |
| y = i / p.t |
| return x + p.r[y] |
| |
| |
| decorated_settings = [ |
| DecoratedSetting(hash(setting.id), name, setting) |
| for name, setting in _SETTINGS.iteritems() |
| ] |
| |
| print >> H, 'typedef enum {' |
| for decorated_setting in sorted(decorated_settings): |
| print >> H, ' GRPC_CHTTP2_SETTINGS_%s = %d, /* wire id %d */' % ( |
| decorated_setting.name, decorated_setting.enum, |
| decorated_setting.setting.id) |
| print >> H, '} grpc_chttp2_setting_id;' |
| print >> H |
| print >> H, '#define GRPC_CHTTP2_NUM_SETTINGS %d' % ( |
| max(x.enum for x in decorated_settings) + 1) |
| |
| print >> H, 'extern const uint16_t grpc_setting_id_to_wire_id[];' |
| print >> C, 'const uint16_t grpc_setting_id_to_wire_id[] = {%s};' % ','.join( |
| '%d' % s for s in p.slots) |
| print >> H |
| print >> H, "bool grpc_wire_id_to_setting_id(uint32_t wire_id, grpc_chttp2_setting_id *out);" |
| cgargs = { |
| 'r': ','.join('%d' % (r if r is not None else 0) for r in p.r), |
| 't': p.t, |
| 'offset': abs(p.offset), |
| 'offset_sign': '+' if p.offset > 0 else '-' |
| } |
| print >> C, """ |
| bool grpc_wire_id_to_setting_id(uint32_t wire_id, grpc_chttp2_setting_id *out) { |
| uint32_t i = wire_id %(offset_sign)s %(offset)d; |
| uint32_t x = i %% %(t)d; |
| uint32_t y = i / %(t)d; |
| uint32_t h = x; |
| switch (y) { |
| """ % cgargs |
| for i, r in enumerate(p.r): |
| if not r: continue |
| if r < 0: print >> C, 'case %d: h -= %d; break;' % (i, -r) |
| else: print >> C, 'case %d: h += %d; break;' % (i, r) |
| print >> C, """ |
| } |
| *out = (grpc_chttp2_setting_id)h; |
| return h < GPR_ARRAY_SIZE(grpc_setting_id_to_wire_id) && grpc_setting_id_to_wire_id[h] == wire_id; |
| } |
| """ % cgargs |
| |
| print >> H, """ |
| typedef enum { |
| GRPC_CHTTP2_CLAMP_INVALID_VALUE, |
| GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE |
| } grpc_chttp2_invalid_value_behavior; |
| |
| typedef struct { |
| const char *name; |
| uint32_t default_value; |
| uint32_t min_value; |
| uint32_t max_value; |
| grpc_chttp2_invalid_value_behavior invalid_value_behavior; |
| uint32_t error_value; |
| } grpc_chttp2_setting_parameters; |
| |
| extern const grpc_chttp2_setting_parameters grpc_chttp2_settings_parameters[GRPC_CHTTP2_NUM_SETTINGS]; |
| """ |
| print >> C, "const grpc_chttp2_setting_parameters grpc_chttp2_settings_parameters[GRPC_CHTTP2_NUM_SETTINGS] = {" |
| i = 0 |
| for decorated_setting in sorted(decorated_settings): |
| while i < decorated_setting.enum: |
| print >> C, "{NULL, 0, 0, 0, GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE, GRPC_HTTP2_PROTOCOL_ERROR}," |
| i += 1 |
| print >> C, "{\"%s\", %du, %du, %du, GRPC_CHTTP2_%s, GRPC_HTTP2_%s}," % ( |
| decorated_setting.name, |
| decorated_setting.setting.default, |
| decorated_setting.setting.min, |
| decorated_setting.setting.max, |
| decorated_setting.setting.on_error.behavior, |
| decorated_setting.setting.on_error.code, |
| ) |
| i += 1 |
| print >> C, "};" |
| |
| print >> H |
| print >> H, "#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HTTP2_SETTINGS_H */" |
| |
| H.close() |
| C.close() |