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vpp/vpp-api/lua/vpp-lapi.lua
Andrew Yourtchenko fa1456a38d Luajit API and some examples 
Change-Id: Ia140c4750f06870c40b7058c4afb2e20ca633a49
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2016-11-11 18:05:53 +00:00

753 lines
26 KiB
Lua
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--[[
/*
* Copyright (c) 2016 Cisco and/or its affiliates.
* 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.
*/
]]
local vpp = {}
local ffi = require("ffi")
--[[
The basic type definitions. A bit of weird gymnastic with
unionization of the hton* and ntoh* functions results
is to make handling of signed and unsigned types a bit cleaner,
essentially building typecasting into a C union.
The vl_api_opaque_message_t is a synthetic type assumed to have
enough storage to hold the entire API message regardless of the type.
During the operation it is casted to the specific message struct types.
]]
ffi.cdef([[
typedef uint8_t u8;
typedef int8_t i8;
typedef uint16_t u16;
typedef int16_t i16;
typedef uint32_t u32;
typedef int32_t i32;
typedef uint64_t u64;
typedef int64_t i64;
typedef double f64;
typedef float f32;
#pragma pack(1)
typedef union {
u16 u16;
i16 i16;
} lua_ui16t;
#pragma pack(1)
typedef union {
u32 u32;
i32 i32;
} lua_ui32t;
u16 ntohs(uint16_t hostshort);
u16 htons(uint16_t hostshort);
u32 htonl(uint32_t along);
u32 ntohl(uint32_t along);
void *memset(void *s, int c, size_t n);
void *memcpy(void *dest, void *src, size_t n);
#pragma pack(1)
typedef struct _vl_api_opaque_message {
u16 _vl_msg_id;
u8 data[65536];
} vl_api_opaque_message_t;
]])
-- CRC-based version stuff
local crc32c_table = ffi.new('const uint32_t[256]',
{ 0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351 }
);
local function CRC8(crc, d)
return bit.bxor(bit.rshift(crc, 8), crc32c_table[bit.band(0xff, bit.bxor(crc, d))])
end
local function CRC16(crc, d)
crc = CRC8(crc, bit.band(d, 0xFF))
d = bit.rshift(d, 8)
crc = CRC8(crc, bit.band(d, 0xFF))
return crc
end
local function string_crc(str, crc)
for i=1,#str do
-- print("S", i, string.byte(str, i), string.char(string.byte(str, i)))
crc = CRC8(crc, string.byte(str, i))
end
return crc
end
local tokens = {
{ ["match"] =' ', ["act"] = { } },
{ ["match"] ='\n', ["act"] = { } },
{ ["match"] ="manual_endian", ["act"] = { "NODE_MANUAL_ENDIAN", "MANUAL_ENDIAN", 276 } },
{ ["match"] ="define", ["act"] = { "NODE_DEFINE", "DEFINE", 267 } },
{ ["match"] ="dont_trace", ["act"] = { "NODE_DONT_TRACE", "DONT_TRACE", 279 } },
{ ["match"] ="f64", ["act"] = { "NODE_F64", "PRIMTYPE", string_crc } },
{ ["match"] ="i16", ["act"] = { "NODE_I16", "PRIMTYPE", string_crc } },
{ ["match"] ="i32", ["act"] = { "NODE_I32", "PRIMTYPE", string_crc } },
{ ["match"] ="i64", ["act"] = { "NODE_I64", "PRIMTYPE", string_crc } },
{ ["match"] ="i8", ["act"] = { "NODE_I8", "PRIMTYPE", string_crc } },
{ ["match"] ="manual_print", ["act"] = { "NODE_MANUAL_PRINT", "MANUAL_PRINT", 275 } },
{ ["match"] ="noversion", ["act"] = { "NODE_NOVERSION", "NOVERSION", 274 } },
{ ["match"] ="packed", ["act"] = { "NODE_PACKED", "TPACKED", 266 } },
{ ["match"] ="typeonly", ["act"] = { "NODE_TYPEONLY", "TYPEONLY", 278 } },
{ ["match"] ="u16", ["act"] = { "NODE_U16", "PRIMTYPE", string_crc } },
{ ["match"] ="u32", ["act"] = { "NODE_U32", "PRIMTYPE", string_crc } },
{ ["match"] ="u64", ["act"] = { "NODE_U64", "PRIMTYPE", string_crc } },
{ ["match"] ="u8", ["act"] = { "NODE_U8", "PRIMTYPE", string_crc } },
{ ["match"] ="union", ["act"] = { "NODE_UNION", "UNION", 271 } },
{ ["match"] ="uword", ["act"] = { "NODE_UWORD", "PRIMTYPE", string_crc } },
{ ["match"] ="%(", ["act"] = { "NODE_LPAR", "LPAR", 259 } },
{ ["match"] ="%)", ["act"] = { "NODE_RPAR", "RPAR", 258 } },
{ ["match"] =";", ["act"] = { "NODE_SEMI", "SEMI", 260 } },
{ ["match"] ="%[", ["act"] = { "NODE_LBRACK", "LBRACK", 261 } },
{ ["match"] ="%]", ["act"] = { "NODE_RBRACK", "RBRACK", 262 } },
{ ["match"] ="%{", ["act"] = { "NODE_LCURLY", "LCURLY", 268 } },
{ ["match"] ="%}", ["act"] = { "NODE_RCURLY", "RCURLY", 269 } },
{ ["match"] ='%b""', ["act"] = { "NODE_STRING", "STRING", string_crc } },
{ ["match"] ='%b@@', ["act"] = { "NODE_HELPER", "HELPER_STRING", string_crc } },
-- TODO: \ must be consumed
{ ["match"] ='[_a-zA-Z][_a-zA-Z0-9]*',
["act"] = { "NODE_NAME", "NAME", string_crc } },
{ ["match"] ='[0-9]+', ["act"] = { "NODE_NUMBER", "NUMBER", string_crc } },
{ ["match"] ='#[^\n]+', ["act"] = { "NODE_PRAGMA", "PRAGMA", nil } },
}
function vpp.crc_version_string(data)
local input_crc = 0
-- Get rid of comments
data = data:gsub("/%*.-%*/", "")
data = data:gsub("//[^\n]+", "")
-- print(data)
idx = 1
while (true) do
local matched = nil
for k, v in ipairs(tokens) do
if not matched then
local x, y, cap = string.find(data, v["match"], idx)
if x == idx then
matched = { ["node"] = v["act"], ["x"] = x, ["y"] = y, ["cap"] = cap, ["chars"] = string.sub(data, x, y) }
-- print(k, v, x, y, cap, matched.chars, matched.node[0] )
end
end
end
if matched then
idx = idx + (matched.y - matched.x + 1)
if matched.node[1] then
local act = matched.node[3]
if type(act) == "function" then
input_crc = act(matched.chars, input_crc)
elseif type(act) == "number" then
input_crc = CRC16(input_crc, act)
end
-- print(vpp.dump(matched))
end
else
-- print("NOT MATCHED!")
local crc = CRC16(input_crc, 0xFFFFFFFF)
return string.sub(string.format("%x", crc), -8)
end
end
end
function vpp.dump(o)
if type(o) == 'table' then
local s = '{ '
for k,v in pairs(o) do
if type(k) ~= 'number' then k = '"'..k..'"' end
s = s .. '['..k..'] = ' .. vpp.dump(v) .. ','
end
return s .. '} '
else
return tostring(o)
end
end
function vpp.hex_dump(buf)
local ret = {}
for i=1,math.ceil(#buf/16) * 16 do
if (i-1) % 16 == 0 then table.insert(ret, string.format('%08X ', i-1)) end
table.insert(ret, ( i > #buf and ' ' or string.format('%02X ', buf:byte(i)) ))
if i % 8 == 0 then table.insert(ret, ' ') end
if i % 16 == 0 then table.insert(ret, buf:sub(i-16+1, i):gsub('%c','.')..'\n' ) end
end
return table.concat(ret)
end
function vpp.c_str(text_in)
local text = text_in -- \000 will be helpfully added by ffi.copy
local c_str = ffi.new("char[?]", #text+1)
ffi.copy(c_str, text)
return c_str
end
function vpp.init(vpp, args)
local pneum_api = args.pneum_api or [[
int cough_pneum_attach(char *pneum_path, char *cough_path);
int pneum_connect(char *name, char *chroot_prefix);
int pneum_connect_sync(char *name, char *chroot_prefix);
int pneum_disconnect(void);
int pneum_read(char **data, int *l);
int pneum_write(char *data, int len);
void pneum_data_free(char *data);
]]
vpp.pneum_path = args.pneum_path
ffi.cdef(pneum_api)
local init_res = 0
if pcall(function()
vpp.cough_path = args.cough_path or "./libcough.so"
vpp.cough = ffi.load(vpp.cough_path)
end) then
pcall(function()
if(vpp.cough.cough_pneum_attach) then
vpp.pneum_is_cough = true
print("libcough detected\n")
init_res = vpp.cough.cough_pneum_attach(vpp.c_str(vpp.pneum_path), vpp.c_str(vpp.cough_path))
vpp.pneum = vpp.cough
end
end)
else
vpp.pneum = ffi.load(vpp.pneum_path)
end
if (init_res < 0) then
return nil
end
vpp.next_msg_num = 1
vpp.msg_name_to_number = {}
vpp.msg_name_to_fields = {}
vpp.msg_number_to_name = {}
vpp.msg_number_to_type = {}
vpp.msg_number_to_pointer_type = {}
vpp.c_type_to_fields = {}
vpp.events = {}
vpp.plugin_version = {}
vpp.is_connected = false
vpp.t_lua2c = {}
vpp.t_c2lua = {}
vpp.t_lua2c["u8"] = function(c_type, src, dst_c_ptr)
if type(src) == "string" then
-- ffi.copy adds a zero byte at the end. Grrr.
-- ffi.copy(dst_c_ptr, src)
ffi.C.memcpy(dst_c_ptr, vpp.c_str(src), #src)
return(#src)
elseif type(src) == "table" then
for i,v in ipairs(src) do
ffi.cast("u8 *", dst_c_ptr)[i-1] = v
end
return(#src)
else
return 1, src -- ffi.cast("u8", src)
end
end
vpp.t_c2lua["u8"] = function(c_type, src_ptr, src_len)
if src_len then
return ffi.string(src_ptr, src_len)
else
return (tonumber(src_ptr))
end
end
vpp.t_lua2c["u16"] = function(c_type, src, dst_c_ptr)
if type(src) == "table" then
for i,v in ipairs(src) do
ffi.cast("u16 *", dst_c_ptr)[i-1] = ffi.C.htons(v)
end
return(2 * #src)
else
return 2, (ffi.C.htons(src))
end
end
vpp.t_c2lua["u16"] = function(c_type, src_ptr, src_len)
if src_len then
local out = {}
for i = 0,src_len-1 do
out[i+1] = tonumber(ffi.C.ntohs(src_ptr[i]))
end
return out
else
return (tonumber(ffi.C.ntohs(src_ptr)))
end
end
vpp.t_lua2c["u32"] = function(c_type, src, dst_c_ptr)
if type(src) == "table" then
for i,v in ipairs(src) do
ffi.cast("u32 *", dst_c_ptr)[i-1] = ffi.C.htonl(v)
end
return(4 * #src)
else
return 4, (ffi.C.htonl(src))
end
end
vpp.t_c2lua["u32"] = function(c_type, src_ptr, src_len)
if src_len then
local out = {}
for i = 0,src_len-1 do
out[i+1] = tonumber(ffi.C.ntohl(src_ptr[i]))
end
return out
else
return (tonumber(ffi.C.ntohl(src_ptr)))
end
end
vpp.t_lua2c["i32"] = function(c_type, src, dst_c_ptr)
if type(src) == "table" then
for i,v in ipairs(src) do
ffi.cast("i32 *", dst_c_ptr)[i-1] = ffi.C.htonl(v)
end
return(4 * #src)
else
return 4, (ffi.C.htonl(src))
end
end
vpp.t_c2lua["i32"] = function(c_type, src_ptr, src_len)
local ntohl = function(src)
local u32val = ffi.cast("u32", src)
local ntohlval = (ffi.C.ntohl(u32val))
local out = tonumber(ffi.cast("i32", ntohlval + 0LL))
return out
end
if src_len then
local out = {}
for i = 0,src_len-1 do
out[i+1] = tonumber(ntohl(src_ptr[i]))
end
else
return (tonumber(ntohl(src_ptr)))
end
end
vpp.t_lua2c["u64"] = function(c_type, src, dst_c_ptr)
if type(src) == "table" then
for i,v in ipairs(src) do
ffi.cast("u64 *", dst_c_ptr)[i-1] = v --- FIXME ENDIAN
end
return(8 * #src)
else
return 8, ffi.cast("u64", src) --- FIXME ENDIAN
end
end
vpp.t_c2lua["u64"] = function(c_type, src_ptr, src_len)
if src_len then
local out = {}
for i = 0,src_len-1 do
out[i+1] = tonumber(src_ptr[i]) -- FIXME ENDIAN
end
return out
else
return (tonumber(src_ptr)) --FIXME ENDIAN
end
end
vpp.t_lua2c["__MSG__"] = function(c_type, src, dst_c_ptr)
local dst = ffi.cast(c_type .. " *", dst_c_ptr)
local additional_len = 0
local fields_info = vpp.c_type_to_fields[c_type]
-- print("__MSG__ type: " .. tostring(c_type))
ffi.C.memset(dst_c_ptr, 0, ffi.sizeof(dst[0]))
-- print(vpp.dump(fields_info))
-- print(vpp.dump(src))
for k,v in pairs(src) do
local field = fields_info[k]
if not field then
print("ERROR: field " .. tostring(k) .. " in message " .. tostring(c_type) .. " is unknown")
end
local lua2c = vpp.t_lua2c[field.c_type]
-- print("__MSG__ field " .. tostring(k) .. " : " .. vpp.dump(field))
-- if the field is not an array type, try to coerce the argument to a number
if not field.array and type(v) == "string" then
v = tonumber(v)
end
if not lua2c then
print("__MSG__ " .. tostring(c_type) .. " t_lua2c: can not store field " .. field.name ..
" type " .. field.c_type .. " dst " .. tostring(dst[k]))
return 0
end
local len = 0
local val = nil
if field.array and (type(v) == "table") then
print("NTFY: field " .. tostring(k) .. " in message " .. tostring(c_type) .. " is an array")
for field_i, field_v in ipairs(v) do
print("NTFY: setting member#" .. tostring(field_i) .. " to value " .. vpp.dump(field_v))
local field_len, field_val = lua2c(field.c_type, field_v, dst[k][field_i-1])
len = len + field_len
end
else
len, val = lua2c(field.c_type, v, dst[k])
end
if not field.array then
dst[k] = val
else
if 0 == field.array then
additional_len = additional_len + len
-- print("Adding " .. tostring(len) .. " bytes due to field " .. tostring(field.name))
-- If there is a variable storing the length
-- and the input table does not set it, do magic
if field.array_size and not src[field.array_size] then
local size_field = fields_info[field.array_size]
if size_field then
dst[field.array_size] = vpp.t_c2lua[size_field.c_type](size_field.c_type, len)
end
end
end
end
-- print("Full message:\n" .. vpp.hex_dump(ffi.string(ffi.cast('void *', req_store_cache), 64)))
end
return (ffi.sizeof(dst[0])+additional_len)
end
vpp.t_c2lua["__MSG__"] = function(c_type, src_ptr, src_len)
local out = {}
local reply_typed_ptr = ffi.cast(c_type .. " *", src_ptr)
local field_desc = vpp.c_type_to_fields[c_type]
if src_len then
for i = 0,src_len-1 do
out[i+1] = vpp.t_c2lua[c_type](c_type, src_ptr[i])
end
return out
end
for k, v in pairs(field_desc) do
local v_c2lua = vpp.t_c2lua[v.c_type]
if v_c2lua then
local len = v.array
-- print(dump(v))
if len then
local len_field_name = k .. "_length"
local len_field = field_desc[len_field_name]
if (len_field) then
local real_len = vpp.t_c2lua[len_field.c_type](len_field.c_type, reply_typed_ptr[len_field_name])
out[k] = v_c2lua(v.c_type, reply_typed_ptr[k], real_len)
elseif len == 0 then
-- check if len = 0, then must be a field which contains the size
len_field = field_desc[v.array_size]
local real_len = vpp.t_c2lua[len_field.c_type](len_field.c_type, reply_typed_ptr[v.array_size])
-- print("REAL length: " .. vpp.dump(v) .. " : " .. tostring(real_len))
out[k] = v_c2lua(v.c_type, reply_typed_ptr[k], real_len)
else
-- alas, just stuff the entire array
out[k] = v_c2lua(v.c_type, reply_typed_ptr[k], len)
end
else
out[k] = v_c2lua(v.c_type, reply_typed_ptr[k])
end
else
out[k] = "<no accessor function for type " .. tostring(v.c_type) .. ">"
end
-- print(k, out[k])
end
return out
end
return vpp
end
function vpp.connect(vpp, client_name)
local name = "lua_client"
if client_name then
name = client_name
end
local ret = vpp.pneum.pneum_connect_sync(vpp.c_str(client_name), nil)
if tonumber(ret) == 0 then
vpp.is_connected = true
end
end
function vpp.disconnect(vpp)
vpp.pneum.pneum_disconnect()
end
function vpp.consume_api(vpp, path, plugin_name)
-- print("Consuming the VPP api from "..path)
local ffii = {}
local f = io.open(path, "r")
if not f then
print("Could not open " .. path)
return nil
end
local data = f:read("*all")
-- Remove all C comments
data = data:gsub("/%*.-%*/", "")
if vpp.is_connected and not plugin_name then
print(path .. ": must specify plugin name!")
return
end
if plugin_name then
vpp.plugin_version[plugin_name] = vpp.crc_version_string(data)
local full_plugin_name = plugin_name .. "_" .. vpp.plugin_version[plugin_name]
local reply = vpp:api_call("get_first_msg_id", { name = full_plugin_name } )
vpp.next_msg_num = tonumber(reply[1].first_msg_id)
print("Plugin " .. full_plugin_name .. " first message is " .. tostring(vpp.next_msg_num))
end
-- print ("data len: ", #data)
data = data:gsub("\n(.-)(%S+)%s*{([^}]*)}", function (preamble, name, members)
local _, typeonly = preamble:gsub("typeonly", "")
local maybe_msg_id_field = { [0] = "u16 _vl_msg_id;", "" }
local onedef = "\n\n#pragma pack(1)\ntypedef struct _vl_api_"..name.. " {\n" ..
-- " u16 _vl_msg_id;" ..
maybe_msg_id_field[typeonly] ..
members:gsub("%[[a-zA-Z_]+]", "[0]") ..
"} vl_api_" .. name .. "_t;"
local c_type = "vl_api_" .. name .. "_t"
local fields = {}
-- vpp.msg_name_to_fields[name] = fields
-- print("CTYPE " .. c_type)
vpp.c_type_to_fields[c_type] = fields
vpp.t_lua2c[c_type] = vpp.t_lua2c["__MSG__"]
vpp.t_c2lua[c_type] = vpp.t_c2lua["__MSG__"]
local mirec = { name = "_vl_msg_id", c_type = "u16", array = nil, array_size = nil }
if typeonly == 0 then
fields[mirec.name] = mirec
end
-- populate the field reflection table for the message
-- sets the various type information as well as the accessors for lua<->C conversion
members:gsub("(%S+)%s+(%S+);", function (fieldtype, fieldname)
local fieldcount = nil
local fieldcountvar = nil
-- data = data:gsub("%[[a-zA-Z_]+]", "[0]")
fieldname = fieldname:gsub("(%b[])", function(cnt)
fieldcount = tonumber(cnt:sub(2, -2));
if not fieldcount then
fieldcount = 0
fieldcountvar = cnt:sub(2, -2)
end
return ""
end)
local fieldrec = { name = fieldname, c_type = fieldtype, array = fieldcount, array_size = fieldcountvar }
if fieldcount then
if fieldtype == "u8" then
-- any array of bytes is treated as a string
elseif vpp.t_lua2c[fieldtype] then
-- print("Array of " .. fieldtype .. " is ok!")
else
print("Unknown array type: ", name, " : " , fieldname, " : ", fieldtype, ":", fieldcount, ":", fieldcountvar)
end
end
fields[fieldname] = fieldrec
end)
-- print(dump(fields))
if typeonly == 0 then
local this_message_number = vpp.next_msg_num
vpp.next_msg_num = vpp.next_msg_num + 1
vpp.msg_name_to_number[name] = this_message_number
vpp.msg_number_to_name[this_message_number] = name
vpp.msg_number_to_type[this_message_number] = "vl_api_" .. name .. "_t"
vpp.msg_number_to_pointer_type[this_message_number] = vpp.msg_number_to_type[this_message_number] .. " *"
onedef = onedef .. "\n\n enum { vl_msg_" .. name .. " = " .. this_message_number .. " };\n\n"
end
table.insert(ffii, onedef);
return "";
end)
local cdef = table.concat(ffii)
-- print(cdef)
ffi.cdef(cdef)
end
function vpp.lua2c(vpp, c_type, src, dst_c_ptr)
-- returns the number of bytes written to memory pointed by dst
local lua2c = vpp.t_lua2c[c_type]
if lua2c then
return(lua2c(c_type, src, dst_c_ptr))
else
print("vpp.lua2c: do not know how to store type " .. c_type)
return 0
end
end
function vpp.c2lua(vpp, c_type, src_ptr, src_len)
-- returns the lua data structure
local c2lua = vpp.t_c2lua[c_type]
if c2lua then
return(c2lua(c_type, src_ptr, src_len))
else
print("vpp.c2lua: do not know how to load type " .. c_type)
return nil
end
end
local req_store_cache = ffi.new("vl_api_opaque_message_t[1]")
function vpp.api_write(vpp, api_name, req_table)
local msg_num = vpp.msg_name_to_number[api_name]
if not msg_num then
print ("API call "..api_name.." is not known")
return nil
end
if not req_table then
req_table = {}
end
req_table._vl_msg_id = msg_num
local packed_len = vpp:lua2c(vpp.msg_number_to_type[msg_num], req_table, req_store_cache)
if vpp.debug_dump then
print("Write Message length: " .. tostring(packed_len) .. "\n" .. vpp.hex_dump(ffi.string(ffi.cast('void *', req_store_cache), packed_len)))
end
res = vpp.pneum.pneum_write(ffi.cast('void *', req_store_cache), packed_len)
return res
end
local rep_store_cache = ffi.new("vl_api_opaque_message_t *[1]")
local rep_len_cache = ffi.new("int[1]")
function vpp.api_read(vpp)
local rep_type = "vl_api_opaque_message_t"
local rep = rep_store_cache
local replen = rep_len_cache
res = vpp.pneum.pneum_read(ffi.cast("void *", rep), replen)
if vpp.debug_dump then
print("Read Message length: " .. tostring(replen[0]) .. "\n" .. vpp.hex_dump(ffi.string(ffi.cast('void *', rep[0]), replen[0])))
end
local reply_msg_num = ffi.C.ntohs(rep[0]._vl_msg_id)
local reply_msg_name = vpp.msg_number_to_name[reply_msg_num]
local reply_typed_ptr = ffi.cast(vpp.msg_number_to_pointer_type[reply_msg_num], rep[0])
local out = vpp:c2lua(vpp.msg_number_to_type[reply_msg_num], rep[0], nil, replen[0])
if type(out) == "table" then
out["luaapi_message_name"] = reply_msg_name
end
vpp.pneum.pneum_data_free(ffi.cast('void *',rep[0]))
return reply_msg_name, out
end
function vpp.api_call(vpp, api_name, req_table, options_in)
local msg_num = vpp.msg_name_to_number[api_name]
local end_message_name = api_name .."_reply"
local replies = {}
local cstruct = ""
local options = options_in or {}
if msg_num then
vpp:api_write(api_name, req_table)
if not vpp.msg_name_to_number[end_message_name] or options.force_ping then
end_message_name = "control_ping_reply"
vpp:api_write("control_ping")
end
repeat
reply_message_name, reply = vpp:api_read()
if reply and not reply.context then
-- there may be async events inbetween
table.insert(vpp.events, reply)
else
if reply_message_name ~= "control_ping_reply" then
-- do not insert the control ping encapsulation
table.insert(replies, reply)
end
end
-- print(reply)
until reply_message_name == end_message_name
else
print(api_name .. " is an unknown API call")
return nil
end
return replies
end
return vpp
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