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vsctool.py
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vsctool.py
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
#
# Copyright (c) 2017 Varnish Software AS
# All rights reserved.
#
# Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
"""
This program compiles a .vsc file to C language constructs.
"""
from __future__ import print_function
import getopt
import json
import sys
import gzip
try:
import StringIO
except ImportError:
import io
import collections
import struct
TYPES = [ "counter", "gauge", "bitmap" ]
CTYPES = [ "uint64_t" ]
LEVELS = [ "info", "diag", "debug" ]
FORMATS = [ "integer", "bytes", "bitmap", "duration" ]
PARAMS = {
"type": ["counter", TYPES],
"ctype": ["uint64_t", CTYPES],
"level": ["info", LEVELS],
"oneliner": True,
"format": [ "integer", FORMATS],
}
# http://python3porting.com/problems.html#bytes-strings-and-unicode
if sys.version_info < (3,):
def b(x):
return x
else:
import codecs
def b(x):
return codecs.latin_1_encode(x)[0]
def gzip_str(s):
try:
out = StringIO.StringIO()
except NameError:
out = io.BytesIO()
gzip.GzipFile(fileobj=out, mode="w").write(b(s))
out.seek(4)
out.write(struct.pack("<L", 0x12bfd58))
return out.getvalue()
def genhdr(fo, name):
fo.write('/*\n')
fo.write(' * NB: This file is machine generated, DO NOT EDIT!\n')
fo.write(' *\n')
fo.write(' * Edit %s.vsc run lib/libvcc/vsctool.py instead.\n' % name)
fo.write(' */\n')
fo.write('\n')
#######################################################################
class vscset(object):
def __init__(self, name, m):
self.name = name
self.struct = "struct VSC_" + name
self.mbrs = []
self.head = m
self.completed = False
self.off = 8
def addmbr(self, m):
assert not self.completed
self.mbrs.append(m)
m.param["index"] = self.off
self.off += 8
def complete(self):
self.completed = True
def emit_json(self, fo):
dd = collections.OrderedDict()
dd["version"] = "1"
dd["name"] = self.name
dd["oneliner"] = self.head.param["oneliner"].strip()
dd["order"] = int(self.head.param["order"])
dd["docs"] = "\n".join(self.head.getdoc())
dd["elements"] = len(self.mbrs)
el = collections.OrderedDict()
dd["elem"] = el
for i in self.mbrs:
ed = collections.OrderedDict()
el[i.arg] = ed
for j in PARAMS:
if j in i.param:
ed[j] = i.param[j]
ed["index"] = i.param["index"]
ed["name"] = i.arg
ed["docs"] = "\n".join(i.getdoc())
s=json.dumps(dd, separators=(",",":")) + "\0"
fo.write("\nstatic const size_t vsc_%s_jsonlen = %dL;\n" %
(self.name, len(s)))
z = gzip_str(s)
fo.write("\nstatic const unsigned char");
fo.write(" vsc_%s_zjson[%d] = {\n" % (self.name, len(z)))
bz = bytearray(z)
t = "\t"
for i in bz:
t += "%d," % i
if len(t) >= 70:
fo.write(t + "\n")
t = "\t"
if len(t) > 1:
fo.write(t[:-1])
fo.write("\n};\n")
s = json.dumps(dd, indent=2, separators=(',', ': '))
fo.write("\n// ")
fo.write("\n// ".join(s.split("\n")))
fo.write("\n")
def emit_h(self):
fon="VSC_" + self.name + ".h"
fo = open(fon, "w")
genhdr(fo, self.name)
fo.write(self.struct + " {\n")
for i in self.mbrs:
fo.write("\tuint64_t\t%s;\n" % i.arg)
fo.write("};\n")
fo.write("\n");
fo.write(self.struct + " *VSC_" + self.name + "_New")
fo.write("(const char *fmt, ...);\n");
fo.write("void VSC_" + self.name + "_Destroy")
fo.write("(" + self.struct + "**);\n")
if 'sumfunction' in self.head.param:
fo.write("void VSC_" + self.name + "_Summ")
fo.write("(" + self.struct + " *, ")
fo.write("const " + self.struct + " *);\n")
def emit_c(self):
fon="VSC_" + self.name + ".c"
fo = open(fon, "w")
genhdr(fo, self.name)
fo.write('#include "config.h"\n')
fo.write('#include <stddef.h>\n')
fo.write('#include <stdarg.h>\n')
fo.write('#include <stdio.h>\n')
fo.write('#include <stdint.h>\n')
fo.write('#include "vdef.h"\n')
fo.write('#include "vas.h"\n')
fo.write('#include "vrt.h"\n')
fo.write('#include "VSC_%s.h"\n' % self.name)
fo.write("\n")
fo.write('static const char vsc_%s_name[] = "%s";\n' %
(self.name, self.name.upper()))
fo.write("\n")
for i in self.mbrs:
fo.write("_Static_assert(offsetof(" + self.struct)
fo.write(", " + i.arg + ")")
fo.write(" == %d,\n" % (i.param["index"] - 8))
fo.write(' "VSC element offset is wrong");\n')
self.emit_json(fo)
fo.write("\n")
fo.write(self.struct + "*\n");
fo.write("VSC_" + self.name + "_New")
fo.write("(const char *fmt, ...)\n");
fo.write("{\n")
fo.write("\tva_list ap;\n")
fo.write("\t" + self.struct + " *retval;\n")
fo.write("\n")
fo.write("\tva_start(ap, fmt);\n")
fo.write("\tretval = VRT_VSC_Alloc")
fo.write("(vsc_" + self.name + "_name, ")
fo.write("sizeof(" + self.struct + "),\n\t ")
fo.write("vsc_" + self.name + "_jsonlen, ")
fo.write("vsc_" + self.name + "_zjson, ")
fo.write("sizeof vsc_" + self.name + "_zjson,\n")
fo.write("\t fmt, ap);\n")
fo.write("\tva_end(ap);\n")
fo.write("\treturn(retval);\n")
fo.write("}\n")
fo.write("\n")
fo.write("void\n")
fo.write("VSC_" + self.name + "_Destroy")
fo.write("(" + self.struct + " **pp)\n")
fo.write("{\n")
fo.write("\n")
fo.write("\tAN(pp);\n")
fo.write('\tVRT_VSC_Destroy(vsc_%s_name, *pp);\n' % self.name)
fo.write("\t*pp = NULL;\n")
fo.write("}\n")
if 'sumfunction' in self.head.param:
fo.write("\n")
fo.write("void\n")
fo.write("VSC_" + self.name + "_Summ")
fo.write("(" + self.struct + " *dst, ")
fo.write("const " + self.struct + " *src)\n")
fo.write("{\n")
fo.write("\n")
fo.write("\tAN(dst);\n")
fo.write("\tAN(src);\n")
for i in self.mbrs:
fo.write("\tdst->" + i.arg)
fo.write(" += src->" + i.arg + ";\n")
fo.write("}\n")
#######################################################################
class directive(object):
def __init__(self, s):
ll = s.split("\n")
i = ll.pop(0).split("::", 2)
self.cmd = i[0]
self.arg = i[1].strip()
assert len(self.arg.split()) == 1
self.param = {}
while len(ll):
j = ll[0].split(":",2)
if len(j) != 3 or not j[0].isspace():
break
self.param[j[1]] = j[2].strip()
ll.pop(0)
self.ldoc = ll
def getdoc(self):
while len(self.ldoc) and self.ldoc[0].strip() == "":
self.ldoc.pop(0)
while len(self.ldoc) and self.ldoc[-1].strip() == "":
self.ldoc.pop(-1)
return self.ldoc
def moredoc(self, s):
self.getdoc()
self.ldoc += s.split("\n")
def emit_rst(self, fo):
fo.write("\n.. " + self.cmd + ":: " + self.arg + "\n")
self.emit_rst_doc(fo)
def emit_rst_doc(self, fo):
fo.write("\n".join(self.ldoc))
def emit_h(self, fo):
return
class rst_vsc_begin(directive):
def __init__(self, s):
super(rst_vsc_begin, self).__init__(s)
def vscset(self, ss):
ss.append(vscset(self.arg, self))
def emit_rst(self, fo):
fo.write("\n..\n\t" + self.cmd + ":: " + self.arg + "\n")
s = self.arg.upper() + " – " + self.param["oneliner"]
fo.write("\n")
fo.write(s + "\n")
fo.write("=" * len(s) + "\n")
self.emit_rst_doc(fo)
class rst_vsc(directive):
def __init__(self, s):
super(rst_vsc, self).__init__(s)
for i,v in PARAMS.items():
if v is not True:
self.do_default(i, v[0], v[1])
for p in self.param:
if p in PARAMS:
continue
sys.stderr.write("Unknown parameter ")
sys.stderr.write("'" + p + "'")
sys.stderr.write(" on field '" + self.arg + "'\n")
exit(2)
def do_default(self, p, v, s):
if p not in self.param:
self.param[p] = v
if self.param[p] not in s:
sys.stderr.write("Wrong " + p + " '" + self.param[p])
sys.stderr.write("' on field '" + self.arg + "'\n")
exit(2)
def emit_rst(self, fo):
fo.write("\n``%s`` – " % self.arg)
fo.write("`%s` - " % self.param["type"])
fo.write("%s\n\n" % self.param["level"])
fo.write("\t" + self.param["oneliner"] + "\n")
self.emit_rst_doc(fo)
def vscset(self, ss):
ss[-1].addmbr(self)
class rst_vsc_end(directive):
def __init__(self, s):
super(rst_vsc_end, self).__init__(s)
def vscset(self, ss):
ss[-1].complete()
def emit_rst(self, fo):
fo.write("\n..\n\t" + self.cmd + ":: " + self.arg + "\n")
self.emit_rst_doc(fo)
class other(object):
def __init__(self, s):
self.s = s
def emit_rst(self, fo):
fo.write(self.s)
def emit_h(self, fo):
return
def vscset(self, ss):
return
#######################################################################
class vsc_file(object):
def __init__(self, fin):
self.c = []
scs = open(fin).read().split("\n.. ")
self.c.append(other(scs[0]))
ld = None
for i in scs[1:]:
j = i.split(None, 1)
f = {
"varnish_vsc_begin::": rst_vsc_begin,
"varnish_vsc::": rst_vsc,
"varnish_vsc_end::": rst_vsc_end,
}.get(j[0])
if f is None:
s = "\n.. " + i
o = other(s)
if ld is not None:
ld.moredoc(s)
else:
o = f(i)
ld = o
self.c.append(o)
self.vscset = []
for i in self.c:
i.vscset(self.vscset)
def emit_h(self):
for i in self.vscset:
i.emit_h()
def emit_c(self):
for i in self.vscset:
i.emit_c()
def emit_rst(self):
fo = sys.stdout
for i in self.c:
i.emit_rst(fo)
#######################################################################
if __name__ == "__main__":
optlist, args = getopt.getopt(sys.argv[1:], "chr")
fo = sys.stdout
if len(args) != 1:
sys.stderr.write("Need exactly one filename argument\n")
exit(2)
vf = vsc_file(args[0])
for f,v in optlist:
if f == '-r':
vf.emit_rst()
if f == '-h':
vf.emit_h()
if f == '-c':
vf.emit_c()