nghttp2/src/shrpx_mruby.cc

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2015 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "shrpx_mruby.h"
#include <mruby/compile.h>
#include <mruby/string.h>
#include "shrpx_downstream.h"
#include "shrpx_config.h"
#include "shrpx_mruby_module.h"
#include "shrpx_downstream_connection.h"
#include "template.h"
namespace shrpx {
namespace mruby {
MRubyContext::MRubyContext(mrb_state *mrb, RProc *on_request_proc,
RProc *on_response_proc)
: mrb_(mrb), on_request_proc_(on_request_proc),
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on_response_proc_(on_response_proc), running_(false) {}
MRubyContext::~MRubyContext() { mrb_close(mrb_); }
int MRubyContext::run_request_proc(Downstream *downstream, RProc *proc,
int phase) {
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if (!proc || running_) {
return 0;
}
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running_ = true;
MRubyAssocData data{downstream, phase};
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mrb_->ud = &data;
int rv = 0;
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auto ai = mrb_gc_arena_save(mrb_);
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auto res = mrb_run(mrb_, proc, mrb_top_self(mrb_));
(void)res;
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if (mrb_->exc) {
// If response has been committed, ignore error
if (downstream->get_response_state() != Downstream::MSG_COMPLETE) {
rv = -1;
}
auto error =
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mrb_str_ptr(mrb_funcall(mrb_, mrb_obj_value(mrb_->exc), "inspect", 0));
LOG(ERROR) << "Exception caught while executing mruby code: "
<< error->as.heap.ptr;
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mrb_->exc = 0;
}
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mrb_->ud = nullptr;
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mrb_gc_arena_restore(mrb_, ai);
if (data.request_headers_dirty) {
downstream->index_request_headers();
}
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if (data.response_headers_dirty) {
downstream->index_response_headers();
}
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running_ = false;
return rv;
}
int MRubyContext::run_on_request_proc(Downstream *downstream) {
return run_request_proc(downstream, on_request_proc_, PHASE_REQUEST);
}
int MRubyContext::run_on_response_proc(Downstream *downstream) {
return run_request_proc(downstream, on_response_proc_, PHASE_RESPONSE);
}
void MRubyContext::delete_downstream(Downstream *downstream) {
delete_downstream_from_module(mrb_, downstream);
}
// Based on
// https://github.com/h2o/h2o/blob/master/lib/handler/mruby.c. It is
// very hard to write these kind of code because mruby has almost no
// documentation aobut compiling or generating code, at least at the
// time of this writing.
RProc *compile(mrb_state *mrb, const char *filename) {
if (filename == nullptr) {
return nullptr;
}
auto infile = fopen(filename, "rb");
if (infile == nullptr) {
return nullptr;
}
auto infile_d = defer(fclose, infile);
auto mrbc = mrbc_context_new(mrb);
if (mrbc == nullptr) {
LOG(ERROR) << "mrb_context_new failed";
return nullptr;
}
auto mrbc_d = defer(mrbc_context_free, mrb, mrbc);
auto parser = mrb_parse_file(mrb, infile, nullptr);
if (parser == nullptr) {
LOG(ERROR) << "mrb_parse_nstring failed";
return nullptr;
}
auto parser_d = defer(mrb_parser_free, parser);
if (parser->nerr != 0) {
LOG(ERROR) << "mruby parser detected parse error";
return nullptr;
}
auto proc = mrb_generate_code(mrb, parser);
if (proc == nullptr) {
LOG(ERROR) << "mrb_generate_code failed";
return nullptr;
}
return proc;
}
std::unique_ptr<MRubyContext> create_mruby_context() {
auto req_file = get_config()->request_phase_file.get();
auto res_file = get_config()->response_phase_file.get();
if (!req_file && !res_file) {
return make_unique<MRubyContext>(nullptr, nullptr, nullptr);
}
auto mrb = mrb_open();
if (mrb == nullptr) {
LOG(ERROR) << "mrb_open failed";
return nullptr;
}
init_module(mrb);
auto req_proc = compile(mrb, req_file);
if (req_file && !req_proc) {
LOG(ERROR) << "Could not compile mruby code " << req_file;
mrb_close(mrb);
return nullptr;
}
auto res_proc = compile(mrb, res_file);
if (res_file && !res_proc) {
LOG(ERROR) << "Could not compile mruby code " << res_file;
mrb_close(mrb);
return nullptr;
}
return make_unique<MRubyContext>(mrb, req_proc, res_proc);
}
mrb_sym intern_ptr(mrb_state *mrb, void *ptr) {
auto p = reinterpret_cast<uintptr_t>(ptr);
return mrb_intern(mrb, reinterpret_cast<const char *>(&p), sizeof(p));
}
void check_phase(mrb_state *mrb, int phase, int phase_mask) {
if ((phase & phase_mask) == 0) {
mrb_raise(mrb, E_RUNTIME_ERROR, "operation was not allowed in this phase");
}
}
} // namespace mruby
} // namespace shrpx