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t_py_generator.cc
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t_py_generator.cc
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
#include <string>
#include <fstream>
#include <iostream>
#include <vector>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sstream>
#include <algorithm>
#include "t_generator.h"
#include "platform.h"
#include "version.h"
#ifdef SANDESH
#include <cassert>
#endif
using namespace std;
/**
* Python code generator.
*
*/
class t_py_generator : public t_generator {
public:
t_py_generator(
t_program* program,
const std::map<std::string, std::string>& parsed_options,
const std::string& option_string)
: t_generator(program)
{
(void) option_string;
std::map<std::string, std::string>::const_iterator iter;
iter = parsed_options.find("new_style");
gen_newstyle_ = (iter != parsed_options.end());
iter = parsed_options.find("slots");
gen_slots_ = (iter != parsed_options.end());
iter = parsed_options.find("dynamic");
gen_dynamic_ = (iter != parsed_options.end());
if (gen_dynamic_) {
gen_newstyle_ = 0; // dynamic is newstyle
gen_dynbaseclass_ = "TBase";
gen_dynbaseclass_exc_ = "TExceptionBase";
import_dynbase_ = "from thrift.protocol.TBase import TBase, TExceptionBase\n";
}
iter = parsed_options.find("dynbase");
if (iter != parsed_options.end()) {
gen_dynbase_ = true;
gen_dynbaseclass_ = (iter->second);
}
iter = parsed_options.find("dynexc");
if (iter != parsed_options.end()) {
gen_dynbaseclass_exc_ = (iter->second);
}
iter = parsed_options.find("dynimport");
if (iter != parsed_options.end()) {
gen_dynbase_ = true;
import_dynbase_ = (iter->second);
}
iter = parsed_options.find("twisted");
gen_twisted_ = (iter != parsed_options.end());
iter = parsed_options.find("utf8strings");
gen_utf8strings_ = (iter != parsed_options.end());
copy_options_ = option_string;
if (gen_twisted_){
out_dir_base_ = "gen-py.twisted";
} else {
out_dir_base_ = "gen-py";
}
}
/**
* Init and close methods
*/
void init_generator();
void close_generator();
/**
* Program-level generation functions
*/
void generate_typedef (t_typedef* ttypedef);
void generate_enum (t_enum* tenum);
void generate_const (t_const* tconst);
void generate_struct (t_struct* tstruct);
void generate_xception (t_struct* txception);
void generate_service (t_service* tservice);
#ifdef SANDESH
void generate_sandesh (t_sandesh* tsandesh);
#endif
std::string render_const_value(t_type* type, t_const_value* value);
/**
* Struct generation code
*/
void generate_py_struct(t_struct* tstruct, bool is_exception);
void generate_py_struct_definition(std::ofstream& out, t_struct* tstruct, bool is_xception=false, bool is_result=false);
void generate_py_struct_reader(std::ofstream& out, t_struct* tstruct);
void generate_py_struct_writer(std::ofstream& out, t_struct* tstruct);
void generate_py_struct_required_validator(std::ofstream& out, t_struct* tstruct);
void generate_py_function_helpers(t_function* tfunction);
#ifdef SANDESH
void generate_py_struct_logger(std::ofstream& out, t_struct* tstruct);
void generate_py_struct_sizeof(std::ofstream& out, t_struct* tstruct);
#endif
/**
* Sandesh generation code
*/
#ifdef SANDESH
void generate_py_sandesh(t_sandesh *tsandesh);
void generate_py_sandesh_definition(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_reader(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_writer(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_compare(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_required_validator(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_http_request_handler(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_http_attr(ofstream& out,
t_type *ftype, const std::string& namel, const std::string& namer);
void generate_py_sandesh_skeleton_request(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_request_list(std::ofstream& out);
void generate_py_sandesh_http_request_list(std::ofstream& out, t_sandesh* tsandesh);
void generate_struct_log(std::ofstream& out, std::string prefix, std::string log_str);
void generate_container_log(std::ofstream& out, std::string prefix, t_type* ttype, string log_str);
void generate_field_log(std::ofstream& out, t_field *tfield, std::string log_str, std::string prefix);
void generate_py_sandesh_logger(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_hint(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_async(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_request(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_response(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_uve(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_uve_list(std::ofstream& out);
void generate_py_sandesh_uve_data_list(std::ofstream& out);
void generate_py_sandesh_alarm_list(std::ofstream& out);
void generate_py_sandesh_alarm_data_list(std::ofstream& out);
void generate_py_sandesh_trace(std::ofstream& out, t_sandesh* tsandesh);
void generate_py_sandesh_sizeof(std::ofstream& out, t_sandesh* tsandesh);
#endif
#ifdef SANDESH
void generate_py_sizeof(std::ofstream& out, const vector<t_field*>& fields);
#endif
/**
* Service-level generation functions
*/
void generate_service_helpers (t_service* tservice);
void generate_service_interface (t_service* tservice);
void generate_service_client (t_service* tservice);
void generate_service_remote (t_service* tservice);
void generate_service_server (t_service* tservice);
void generate_process_function (t_service* tservice, t_function* tfunction);
/**
* Serialization constructs
*/
void generate_deserialize_field (std::ofstream &out,
t_field* tfield,
std::string prefix="",
bool inclass=false);
void generate_deserialize_struct (std::ofstream &out,
t_struct* tstruct,
std::string prefix="");
void generate_deserialize_container (std::ofstream &out,
t_type* ttype,
std::string prefix="");
void generate_deserialize_set_element (std::ofstream &out,
t_set* tset,
std::string prefix="");
void generate_deserialize_map_element (std::ofstream &out,
t_map* tmap,
std::string prefix="");
void generate_deserialize_list_element (std::ofstream &out,
t_list* tlist,
std::string prefix="");
void generate_serialize_field (std::ofstream &out,
t_field* tfield,
std::string prefix="");
void generate_serialize_struct (std::ofstream &out,
t_struct* tstruct,
std::string prefix="");
#ifdef SANDESH
void generate_serialize_sandesh (std::ofstream &out,
t_sandesh* tsandesh,
std::string prefix="");
#endif
void generate_serialize_container (std::ofstream &out,
t_type* ttype,
std::string prefix="");
void generate_serialize_map_element (std::ofstream &out,
t_map* tmap,
std::string kiter,
std::string viter);
void generate_serialize_set_element (std::ofstream &out,
t_set* tmap,
std::string iter);
void generate_serialize_list_element (std::ofstream &out,
t_list* tlist,
std::string iter);
void generate_python_docstring (std::ofstream& out,
t_struct* tstruct);
void generate_python_docstring (std::ofstream& out,
t_function* tfunction);
void generate_python_docstring (std::ofstream& out,
t_doc* tdoc,
t_struct* tstruct,
const char* subheader);
void generate_python_docstring (std::ofstream& out,
t_doc* tdoc);
/**
* Helper rendering functions
*/
std::string py_autogen_comment();
#ifdef SANDESH
std::string py_autogen_sandesh_request_skeleton_comment();
void py_autogen_sandesh_http_request_open(std::ofstream& out);
void py_autogen_sandesh_http_request_close(std::ofstream& out);
#endif
std::string py_imports();
std::string render_includes();
std::string render_fastbinary_includes();
#ifdef SANDESH
std::string render_sandesh_includes();
#endif
std::string declare_argument(t_field* tfield);
std::string render_field_default_value(t_field* tfield);
std::string type_name(t_type* ttype);
std::string function_signature(t_function* tfunction, std::string prefix="");
std::string function_signature_if(t_function* tfunction, std::string prefix="");
std::string argument_list(t_struct* tstruct);
std::string type_to_enum(t_type* ttype);
std::string type_to_spec_args(t_type* ttype);
static bool is_valid_namespace(const std::string& sub_namespace) {
return sub_namespace == "twisted";
}
static std::string get_real_py_module(const t_program* program, bool gen_twisted) {
if(gen_twisted) {
std::string twisted_module = program->get_namespace("py.twisted");
if(!twisted_module.empty()){
return twisted_module;
}
}
std::string real_module = program->get_namespace("py");
if (real_module.empty()) {
return program->get_name();
}
return real_module;
}
private:
/**
* True if we should generate new-style classes.
*/
bool gen_newstyle_;
/**
* True if we should generate dynamic style classes.
*/
bool gen_dynamic_;
bool gen_dynbase_;
std::string gen_dynbaseclass_;
std::string gen_dynbaseclass_exc_;
std::string import_dynbase_;
bool gen_slots_;
std::string copy_options_;
/**
* True if we should generate Twisted-friendly RPC services.
*/
bool gen_twisted_;
/**
* True if strings should be encoded using utf-8.
*/
bool gen_utf8strings_;
#ifdef SANDESH
/**
* Sandesh Request List
*/
std::vector<std::string> sandesh_req_list_;
/**
* Sandesh UVE List
*/
std::vector<std::string> sandesh_uve_list_;
/**
* Sandesh UVE Data List
*/
std::vector<std::string> sandesh_uve_data_list_;
/**
* Sandesh Alarm List
*/
std::vector<std::string> sandesh_alarm_list_;
/**
* Sandesh Alarm Data List
*/
std::vector<std::string> sandesh_alarm_data_list_;
#endif
/**
* File streams
*/
std::ofstream f_types_;
std::ofstream f_consts_;
std::ofstream f_service_;
#ifdef SANDESH
std::ofstream f_request_impl_;
std::ofstream f_http_request_;
#endif
std::string package_dir_;
};
/**
* Prepares for file generation by opening up the necessary file output
* streams.
*
* @param tprogram The program to generate
*/
void t_py_generator::init_generator() {
// Make output directory
string module = get_real_py_module(program_, gen_twisted_);
package_dir_ = get_out_dir();
while (true) {
// TODO: Do better error checking here.
MKDIR(package_dir_.c_str());
std::ofstream init_py((package_dir_+"/__init__.py").c_str());
init_py.close();
if (module.empty()) {
break;
}
string::size_type pos = module.find('.');
if (pos == string::npos) {
package_dir_ += "/";
package_dir_ += module;
module.clear();
} else {
package_dir_ += "/";
package_dir_ += module.substr(0, pos);
module.erase(0, pos+1);
}
}
// Make output file
string f_types_name = package_dir_+"/"+"ttypes.py";
f_types_.open(f_types_name.c_str());
string f_consts_name = package_dir_+"/"+"constants.py";
f_consts_.open(f_consts_name.c_str());
string f_init_name = package_dir_+"/__init__.py";
ofstream f_init;
f_init.open(f_init_name.c_str());
f_init <<
"__all__ = ['ttypes', 'constants'";
vector<t_service*> services = program_->get_services();
vector<t_service*>::iterator sv_iter;
for (sv_iter = services.begin(); sv_iter != services.end(); ++sv_iter) {
f_init << ", '" << (*sv_iter)->get_name() << "'";
}
f_init << "]" << endl;
f_init.close();
// Print header
f_types_ <<
py_autogen_comment() << endl <<
py_imports() << endl <<
render_includes() << endl <<
render_fastbinary_includes() <<
render_sandesh_includes() <<
endl << endl;
f_consts_ <<
py_autogen_comment() << endl <<
py_imports() << endl <<
"from ttypes import *" << endl <<
endl;
#ifdef SANDESH
string f_request_impl_name = package_dir_+"/request_skeleton.py";
f_request_impl_.open(f_request_impl_name.c_str());
f_request_impl_ <<
py_autogen_comment() << endl;
f_request_impl_ <<
py_autogen_sandesh_request_skeleton_comment() << endl;
string f_http_request_name = package_dir_+"/http_request.py";
f_http_request_.open(f_http_request_name.c_str());
f_http_request_ <<
py_autogen_comment() << endl;
f_http_request_ <<
"import ttypes" << endl;
py_autogen_sandesh_http_request_open(f_http_request_);
#endif
}
/**
* Renders all the imports necessary for including another Thrift program
*/
string t_py_generator::render_includes() {
const vector<t_program*>& includes = program_->get_includes();
string result = "";
for (size_t i = 0; i < includes.size(); ++i) {
result += "import " + get_real_py_module(includes[i], gen_twisted_) + ".ttypes\n";
}
if (includes.size() > 0) {
result += "\n";
}
return result;
}
/**
* Renders all the imports necessary to use the accelerated TBinaryProtocol
*/
string t_py_generator::render_fastbinary_includes() {
string hdr = "";
if (gen_dynamic_) {
hdr += std::string(import_dynbase_);
} else {
#ifdef SANDESH
hdr +=
"from pysandesh.transport import TTransport\n"
"from pysandesh.protocol import TBinaryProtocol, TProtocol\n"
"try:\n"
" from pysandesh.protocol import fastbinary\n"
"except:\n"
" fastbinary = None\n";
#else
hdr +=
"from thrift.transport import TTransport\n"
"from thrift.protocol import TBinaryProtocol, TProtocol\n"
"try:\n"
" from thrift.protocol import fastbinary\n"
"except:\n"
" fastbinary = None\n";
#endif
}
return hdr;
}
#ifdef SANDESH
string t_py_generator::render_sandesh_includes() {
std::string module = get_real_py_module(program_, gen_twisted_);
std::string sandesh_includes("\n");
sandesh_includes +=
"import cStringIO\n"
"import uuid\n"
"from sys import getsizeof\n"
"from itertools import chain\n";
if (module != "sandesh") {
sandesh_includes +=
"import bottle\n"
"from pysandesh import sandesh_base\n"
"from pysandesh.sandesh_http import SandeshHttp\n"
"from pysandesh.sandesh_uve import SandeshUVETypeMaps\n"
"from pysandesh.util import UTCTimestampUsec, UTCTimestampUsecToString\n"
"from pysandesh.gen_py.sandesh.constants import *\n"
"import collections\n";
}
return sandesh_includes;
}
#endif
/**
* Autogen'd comment
*/
string t_py_generator::py_autogen_comment() {
#ifdef SANDESH
return
std::string("#\n") +
"# Autogenerated by Sandesh Compiler (" + SANDESH_VERSION + ")\n" +
"#\n" +
"# DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING\n" +
"#\n" +
"# options string: " + copy_options_ + "\n" +
"# Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.\n" +
"#\n";
#else
return
std::string("#\n") +
"# Autogenerated by Thrift Compiler \n" +
"#\n" +
"# DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING\n" +
"#\n" +
"# options string: " + copy_options_ + "\n" +
"#\n";
#endif
}
/**
* Prints standard thrift imports
*/
string t_py_generator::py_imports() {
#ifdef SANDESH
return
string("from pysandesh.Thrift import TType, TMessageType, TException");
#else
return
string("from thrift.Thrift import TType, TMessageType, TException");
#endif
}
/**
* Closes the type files
*/
void t_py_generator::close_generator() {
#ifdef SANDESH
generate_py_sandesh_request_list(f_types_);
generate_py_sandesh_uve_list(f_types_);
generate_py_sandesh_uve_data_list(f_types_);
generate_py_sandesh_alarm_list(f_types_);
generate_py_sandesh_alarm_data_list(f_types_);
#endif
// Close types file
f_types_.close();
f_consts_.close();
#ifdef SANDESH
f_request_impl_.close();
py_autogen_sandesh_http_request_close(f_http_request_);
f_http_request_.close();
#endif
}
/**
* Generates a typedef. This is not done in Python, types are all implicit.
*
* @param ttypedef The type definition
*/
void t_py_generator::generate_typedef(t_typedef* ttypedef) {
(void) ttypedef;
}
/**
* Generates code for an enumerated type. Done using a class to scope
* the values.
*
* @param tenum The enumeration
*/
void t_py_generator::generate_enum(t_enum* tenum) {
std::ostringstream to_string_mapping, from_string_mapping;
f_types_ <<
"class " << tenum->get_name() <<
(gen_newstyle_ ? "(object)" : "") <<
(gen_dynamic_ ? "(" + gen_dynbaseclass_ + ")" : "") <<
":" << endl;
indent_up();
generate_python_docstring(f_types_, tenum);
to_string_mapping << indent() << "_VALUES_TO_NAMES = {" << endl;
from_string_mapping << indent() << "_NAMES_TO_VALUES = {" << endl;
vector<t_enum_value*> constants = tenum->get_constants();
vector<t_enum_value*>::iterator c_iter;
for (c_iter = constants.begin(); c_iter != constants.end(); ++c_iter) {
int value = (*c_iter)->get_value();
indent(f_types_) << (*c_iter)->get_name() << " = " << value << endl;
// Dictionaries to/from string names of enums
to_string_mapping <<
indent() << indent() << value << ": \"" <<
escape_string((*c_iter)->get_name()) << "\"," << endl;
from_string_mapping <<
indent() << indent() << '"' << escape_string((*c_iter)->get_name()) <<
"\": " << value << ',' << endl;
}
to_string_mapping << indent() << "}" << endl;
from_string_mapping << indent() << "}" << endl;
indent_down();
f_types_ << endl;
f_types_ << to_string_mapping.str() << endl << from_string_mapping.str() << endl;
}
/**
* Generate a constant value
*/
void t_py_generator::generate_const(t_const* tconst) {
t_type* type = tconst->get_type();
string name = tconst->get_name();
t_const_value* value = tconst->get_value();
indent(f_consts_) << name << " = " << render_const_value(type, value);
f_consts_ << endl;
}
/**
* Prints the value of a constant with the given type. Note that type checking
* is NOT performed in this function as it is always run beforehand using the
* validate_types method in main.cc
*/
string t_py_generator::render_const_value(t_type* type, t_const_value* value) {
type = get_true_type(type);
std::ostringstream out;
if (type->is_base_type()) {
t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
switch (tbase) {
case t_base_type::TYPE_STRING:
#ifdef SANDESH
case t_base_type::TYPE_STATIC_CONST_STRING:
case t_base_type::TYPE_XML:
#endif
out << '"' << get_escaped_string(value) << '"';
break;
case t_base_type::TYPE_BOOL:
out << (value->get_integer() > 0 ? "True" : "False");
break;
case t_base_type::TYPE_BYTE:
case t_base_type::TYPE_I16:
case t_base_type::TYPE_I32:
case t_base_type::TYPE_I64:
#ifdef SANDESH
case t_base_type::TYPE_U16:
case t_base_type::TYPE_U32:
case t_base_type::TYPE_U64:
case t_base_type::TYPE_IPV4:
#endif
out << value->get_integer();
break;
case t_base_type::TYPE_DOUBLE:
if (value->get_type() == t_const_value::CV_INTEGER) {
out << value->get_integer();
} else {
out << value->get_double();
}
break;
#ifdef SANDESH
case t_base_type::TYPE_UUID:
out << "uuid.UUID('{" << get_escaped_string(value) <<"}')";
break;
#endif
default:
throw "compiler error: no const of base type " + t_base_type::t_base_name(tbase);
}
} else if (type->is_enum()) {
indent(out) << value->get_integer();
} else if (type->is_struct() || type->is_xception()) {
out << type->get_name() << "(**{" << endl;
indent_up();
const vector<t_field*>& fields = ((t_struct*)type)->get_members();
vector<t_field*>::const_iterator f_iter;
const map<t_const_value*, t_const_value*>& val = value->get_map();
map<t_const_value*, t_const_value*>::const_iterator v_iter;
for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
t_type* field_type = NULL;
for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
if ((*f_iter)->get_name() == v_iter->first->get_string()) {
field_type = (*f_iter)->get_type();
}
}
if (field_type == NULL) {
throw "type error: " + type->get_name() + " has no field " + v_iter->first->get_string();
}
out << indent();
out << render_const_value(g_type_string, v_iter->first);
out << " : ";
out << render_const_value(field_type, v_iter->second);
out << "," << endl;
}
indent_down();
indent(out) << "})";
} else if (type->is_map()) {
t_type* ktype = ((t_map*)type)->get_key_type();
t_type* vtype = ((t_map*)type)->get_val_type();
out << "{" << endl;
indent_up();
const map<t_const_value*, t_const_value*>& val = value->get_map();
map<t_const_value*, t_const_value*>::const_iterator v_iter;
for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
out << indent();
out << render_const_value(ktype, v_iter->first);
out << " : ";
out << render_const_value(vtype, v_iter->second);
out << "," << endl;
}
indent_down();
indent(out) << "}";
} else if (type->is_list() || type->is_set()) {
t_type* etype;
if (type->is_list()) {
etype = ((t_list*)type)->get_elem_type();
} else {
etype = ((t_set*)type)->get_elem_type();
}
if (type->is_set()) {
out << "set(";
}
out << "[" << endl;
indent_up();
const vector<t_const_value*>& val = value->get_list();
vector<t_const_value*>::const_iterator v_iter;
for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
out << indent();
out << render_const_value(etype, *v_iter);
out << "," << endl;
}
indent_down();
indent(out) << "]";
if (type->is_set()) {
out << ")";
}
} else {
throw "CANNOT GENERATE CONSTANT FOR TYPE: " + type->get_name();
}
return out.str();
}
/**
* Generates a python struct
*/
void t_py_generator::generate_struct(t_struct* tstruct) {
generate_py_struct(tstruct, false);
}
/**
* Generates a struct definition for a thrift exception. Basically the same
* as a struct but extends the Exception class.
*
* @param txception The struct definition
*/
void t_py_generator::generate_xception(t_struct* txception) {
generate_py_struct(txception, true);
}
void t_py_generator::generate_sandesh(t_sandesh* tsandesh) {
generate_py_sandesh(tsandesh);
}
/**
* Generates a python struct
*/
void t_py_generator::generate_py_struct(t_struct* tstruct,
bool is_exception) {
generate_py_struct_definition(f_types_, tstruct, is_exception);
}
/**
* Generates a struct definition for a thrift data type.
*
* @param tstruct The struct definition
*/
void t_py_generator::generate_py_struct_definition(ofstream& out,
t_struct* tstruct,
bool is_exception,
bool is_result) {
(void) is_result;
const vector<t_field*>& members = tstruct->get_members();
const vector<t_field*>& sorted_members = tstruct->get_sorted_members();
vector<t_field*>::const_iterator m_iter;
out << std::endl <<
"class " << tstruct->get_name();
if (is_exception) {
if (gen_dynamic_) {
out << "(" << gen_dynbaseclass_exc_ << ")";
} else {
out << "(TException)";
}
} else {
if (gen_newstyle_) {
out << "(object)";
} else if (gen_dynamic_) {
out << "(" << gen_dynbaseclass_ << ")";
}
}
out << ":" << endl;
indent_up();
generate_python_docstring(out, tstruct);
out << endl;
/*
Here we generate the structure specification for the fastbinary codec.
These specifications have the following structure:
thrift_spec -> tuple of item_spec
item_spec -> None | (tag, type_enum, name, spec_args, default)
tag -> integer
type_enum -> TType.I32 | TType.STRING | TType.STRUCT | ...
name -> string_literal
default -> None # Handled by __init__
spec_args -> None # For simple types
| (type_enum, spec_args) # Value type for list/set
| (type_enum, spec_args, type_enum, spec_args)
# Key and value for map
| (class_name, spec_args_ptr) # For struct/exception
class_name -> identifier # Basically a pointer to the class
spec_args_ptr -> expression # just class_name.spec_args
TODO(dreiss): Consider making this work for structs with negative tags.
*/
if (gen_slots_) {
indent(out) << "__slots__ = [ " << endl;
indent_up();
for (m_iter = sorted_members.begin(); m_iter != sorted_members.end(); ++m_iter) {
indent(out) << "'" << (*m_iter)->get_name() << "'," << endl;
}
indent_down();
indent(out) << " ]" << endl << endl;
}
// TODO(dreiss): Look into generating an empty tuple instead of None
// for structures with no members.
// TODO(dreiss): Test encoding of structs where some inner structs
// don't have thrift_spec.
if (sorted_members.empty() || (sorted_members[0]->get_key() >= 0)) {
indent(out) << "thrift_spec = (" << endl;
indent_up();
int sorted_keys_pos = 0;
for (m_iter = sorted_members.begin(); m_iter != sorted_members.end(); ++m_iter) {
for (; sorted_keys_pos != (*m_iter)->get_key(); sorted_keys_pos++) {
indent(out) << "None, # " << sorted_keys_pos << endl;
}
indent(out) << "(" << (*m_iter)->get_key() << ", "
<< type_to_enum((*m_iter)->get_type()) << ", "
<< "'" << (*m_iter)->get_name() << "'" << ", "
<< type_to_spec_args((*m_iter)->get_type()) << ", "
<< render_field_default_value(*m_iter) << ", "
<< "),"
<< " # " << sorted_keys_pos
<< endl;
sorted_keys_pos ++;
}
indent_down();
indent(out) << ")" << endl << endl;
} else {
indent(out) << "thrift_spec = None" << endl;
}
if (members.size() > 0) {
out <<
indent() << "def __init__(self,";
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
#ifdef SANDESH
// skip const string
t_type* type = get_true_type((*m_iter)->get_type());
if (type->is_static_const_string()) {
continue;
}
#endif
// This fills in default values, as opposed to nulls
out << " " << declare_argument(*m_iter) << ",";
}
out << "):" << endl;
indent_up();
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
// Initialize fields
t_type* type = (*m_iter)->get_type();
if (!type->is_base_type() && !type->is_enum() && (*m_iter)->get_value() != NULL) {
indent(out) <<
"if " << (*m_iter)->get_name() << " is " << "self.thrift_spec[" <<
(*m_iter)->get_key() << "][4]:" << endl;
indent(out) << " " << (*m_iter)->get_name() << " = " <<
render_field_default_value(*m_iter) << endl;
#ifdef SANDESH
} else if (type->is_static_const_string()) {
indent(out) <<
"self." << (*m_iter)->get_name() << " = " <<
render_const_value(type, (*m_iter)->get_value()) << endl;
} else {
#else
}
#endif
indent(out) <<
"self." << (*m_iter)->get_name() << " = " << (*m_iter)->get_name() << endl;
#ifdef SANDESH
}
#endif
}
#ifdef SANDESH
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
if ((*m_iter)->get_name() == "name") {
std::map<std::string, std::string>::iterator it;
it = (*m_iter)->annotations_.find("key");
if (it != (*m_iter)->annotations_.end()) {
indent(out) << "self._table = '" << it->second << "'" << endl;
}
break;
}
}
#endif
indent_down();
out << endl;
}
if (!gen_dynamic_) {
generate_py_struct_reader(out, tstruct);
generate_py_struct_writer(out, tstruct);
}
#ifdef SANDESH
generate_py_struct_logger(out, tstruct);
generate_py_struct_sizeof(out, tstruct);
#endif
// For exceptions only, generate a __str__ method. This is
// because when raised exceptions are printed to the console, __repr__
// isn't used. See python bug #5882
if (is_exception) {
out <<
indent() << "def __str__(self):" << endl <<
indent() << " return repr(self)" << endl <<
endl;
}
if (!gen_slots_) {
// Printing utilities so that on the command line thrift
// structs look pretty like dictionaries
out <<
indent() << "def __repr__(self):" << endl <<
indent() << " L = ['%s=%r' % (key, value)" << endl <<
indent() << " for key, value in self.__dict__.iteritems()]" << endl <<
indent() << " return '%s(%s)' % (self.__class__.__name__, ', '.join(L))" << endl <<
endl;
// Equality and inequality methods that compare by value
out <<