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#!/usr/bin/python
# This script generates the boilerplate versions of most fops and cbks in the
# server. This allows the details of leadership-status checking, sequencing
# between leader and followers (including fan-out), and basic error checking
# to be centralized one place, with per-operation code kept to a minimum.
import os
import re
import string
import sys
curdir = os.path.dirname(sys.argv[0])
gendir = os.path.join(curdir,'../../../../libglusterfs/src')
sys.path.append(gendir)
from generator import ops, fop_subs, cbk_subs, generate
# We really want the callback argument list, even when we're generating fop
# code, so we propagate here.
# TBD: this should probably be right in generate.py
for k, v in cbk_subs.iteritems():
fop_subs[k]['@ERROR_ARGS@'] = v['@ERROR_ARGS@']
# Stolen from old codegen.py
def load_templates (path):
templates = {}
tmpl_re = re.compile("/\* template-name (.*) \*/")
templates = {}
t_name = None
for line in open(path,"r").readlines():
if not line:
break
m = tmpl_re.match(line)
if m:
if t_name:
templates[t_name] = string.join(t_contents,'')
t_name = m.group(1).strip()
t_contents = []
elif t_name:
t_contents.append(line)
if t_name:
templates[t_name] = string.join(t_contents,'')
return templates
# We need two types of templates. The first, for pure read operations, just
# needs to do a simple am-i-leader check (augmented to allow dirty reads).
# The second, for pure writes, needs to do fan-out to followers between those
# initial checks and local execution. There are other operations that don't
# fit neatly into either category - e.g. lock ops or fsync - so we'll just have
# to handle those manually. The table thus includes entries only for those we
# can categorize. The special cases, plus any new operations we've never even
# heard of, aren't in there.
#
# Various keywords can be used to define/undefine preprocessor symbols used
# in the templates, on a per-function basis. For example, if the keyword here
# is "fsync" (lowercase word or abbreviation) that will cause JBR_CG_FSYNC
# (prefix plus uppercase version) to be defined above all of the generated code
# for that fop.
fop_table = {
"access": "read",
"create": "write",
"discard": "write",
# "entrylk": "read",
"fallocate": "write",
# "fentrylk": "read",
"fgetxattr": "read",
# "finodelk": "read",
# "flush": "read",
"fremovexattr": "write",
"fsetattr": "write",
"fsetxattr": "write",
"fstat": "read",
# "fsync": "read",
# "fsyncdir": "read",
"ftruncate": "write",
"fxattrop": "write",
"getxattr": "read",
# "inodelk": "read",
"link": "write",
"lk": "write,queue",
# "lookup": "read",
"mkdir": "write",
"mknod": "write",
"open": "write",
"opendir": "read",
"rchecksum": "read",
"readdir": "read",
"readdirp": "read",
"readlink": "read",
"readv": "read",
"removexattr": "write",
"rename": "write",
"rmdir": "write",
"setattr": "write",
"setxattr": "write",
"stat": "read",
"statfs": "read",
"symlink": "write",
"truncate": "write",
"unlink": "write",
"writev": "write,fsync,queue",
"xattrop": "write",
}
# Mention those fops in the selective_generate table, for which
# only a few common functions will be generated, and mention those
# functions. Rest of the functions can be customized
selective_generate = {
"lk": "fop,dispatch,call_dispatch",
}
# Stolen from gen_fdl.py
def gen_server (templates):
fops_done = []
for name in fop_table.keys():
info = fop_table[name].split(",")
kind = info[0]
flags = info[1:]
# generate all functions for the fops in fop_table
# except for the ones in selective_generate for which
# generate only the functions mentioned in the
# selective_generate table
gen_funcs = "fop,complete,continue,fan-in,dispatch, \
call_dispatch,perform_local_op"
if name in selective_generate:
gen_funcs = selective_generate[name].split(",")
if ("fsync" in flags) or ("queue" in flags):
flags.append("need_fd")
for fname in flags:
print "#define JBR_CG_%s" % fname.upper()
if 'complete' in gen_funcs:
print generate(templates[kind+"-complete"],
name,cbk_subs)
if 'continue' in gen_funcs:
print generate(templates[kind+"-continue"],
name,fop_subs)
if 'fan-in' in gen_funcs:
print generate(templates[kind+"-fan-in"],
name,cbk_subs)
if 'dispatch' in gen_funcs:
print generate(templates[kind+"-dispatch"],
name,fop_subs)
if 'call_dispatch' in gen_funcs:
print generate(templates[kind+"-call_dispatch"],
name,fop_subs)
if 'perform_local_op' in gen_funcs:
print generate(templates[kind+"-perform_local_op"],
name, fop_subs)
if 'fop' in gen_funcs:
print generate(templates[kind+"-fop"],name,fop_subs)
for fname in flags:
print "#undef JBR_CG_%s" % fname.upper()
fops_done.append(name)
# Just for fun, emit the fops table too.
print("struct xlator_fops fops = {")
for x in fops_done:
print(" .%s = jbr_%s,"%(x,x))
print("};")
tmpl = load_templates(sys.argv[1])
for l in open(sys.argv[2],'r').readlines():
if l.find('#pragma generate') != -1:
print "/* BEGIN GENERATED CODE - DO NOT MODIFY */"
gen_server(tmpl)
print "/* END GENERATED CODE */"
else:
print l[:-1]
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