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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
/*
* Ceph - scalable distributed file system
*
* Copyright 2023 IBM
*
* See file COPYING for licensing information.
*/
#include <cstdio>
#include <filesystem>
#include <sstream>
#include "arrow/type.h"
#include "arrow/flight/server.h"
#include "arrow/io/file.h"
#include "parquet/arrow/reader.h"
#include "parquet/arrow/schema.h"
#include "parquet/stream_reader.h"
#include "rgw_flight_frontend.h"
#include "rgw_flight.h"
// logging
constexpr unsigned dout_subsys = ceph_subsys_rgw_flight;
constexpr const char* dout_prefix_str = "rgw arrow_flight: ";
namespace rgw::flight {
const FlightKey null_flight_key = 0;
FlightFrontend::FlightFrontend(RGWProcessEnv& _env,
RGWFrontendConfig* _config,
int _port) :
env(_env),
config(_config),
port(_port),
dp(env.driver->ctx(), dout_subsys, dout_prefix_str)
{
env.flight_store = new MemoryFlightStore(dp);
env.flight_server = new FlightServer(env, env.flight_store, dp);
INFO << "flight server started" << dendl;
}
FlightFrontend::~FlightFrontend() {
delete env.flight_server;
env.flight_server = nullptr;
delete env.flight_store;
env.flight_store = nullptr;
INFO << "flight server shut down" << dendl;
}
int FlightFrontend::init() {
if (port <= 0) {
port = FlightServer::default_port;
}
const std::string url =
std::string("grpc+tcp://localhost:") + std::to_string(port);
flt::Location location;
arw::Status s = flt::Location::Parse(url, &location);
if (!s.ok()) {
ERROR << "couldn't parse url=" << url << ", status=" << s << dendl;
return -EINVAL;
}
flt::FlightServerOptions options(location);
options.verify_client = false;
s = env.flight_server->Init(options);
if (!s.ok()) {
ERROR << "couldn't init flight server; status=" << s << dendl;
return -EINVAL;
}
INFO << "FlightServer inited; will use port " << port << dendl;
return 0;
}
int FlightFrontend::run() {
try {
flight_thread = make_named_thread(server_thread_name,
&FlightServer::Serve,
env.flight_server);
INFO << "FlightServer thread started, id=" <<
flight_thread.get_id() <<
", joinable=" << flight_thread.joinable() << dendl;
return 0;
} catch (std::system_error& e) {
ERROR << "FlightServer thread failed to start" << dendl;
return -e.code().value();
}
}
void FlightFrontend::stop() {
env.flight_server->Shutdown();
env.flight_server->Wait();
INFO << "FlightServer shut down" << dendl;
}
void FlightFrontend::join() {
flight_thread.join();
INFO << "FlightServer thread joined" << dendl;
}
void FlightFrontend::pause_for_new_config() {
// ignore since config changes won't alter flight_server
}
void FlightFrontend::unpause_with_new_config() {
// ignore since config changes won't alter flight_server
}
/* ************************************************************ */
FlightGetObj_Filter::FlightGetObj_Filter(const req_state* request,
RGWGetObj_Filter* next) :
RGWGetObj_Filter(next),
penv(request->penv),
dp(request->cct->get(), dout_subsys, dout_prefix_str),
current_offset(0),
expected_size(request->obj_size),
uri(request->decoded_uri),
tenant_name(request->bucket->get_tenant()),
bucket_name(request->bucket->get_name()),
object_key(request->object->get_key()),
// note: what about object namespace and instance?
schema_status(arrow::StatusCode::Cancelled,
"schema determination incomplete"),
user_id(request->user->get_id())
{
#warning "TODO: fix use of tmpnam"
char name[L_tmpnam];
const char* namep = std::tmpnam(name);
if (!namep) {
//
}
temp_file_name = namep;
temp_file.open(temp_file_name);
}
FlightGetObj_Filter::~FlightGetObj_Filter() {
if (temp_file.is_open()) {
temp_file.close();
}
std::error_code error;
std::filesystem::remove(temp_file_name, error);
if (error) {
ERROR << "FlightGetObj_Filter got error when removing temp file; "
"error=" << error.value() <<
", temp_file_name=" << temp_file_name << dendl;
} else {
INFO << "parquet/arrow schema determination status: " <<
schema_status << dendl;
}
}
int FlightGetObj_Filter::handle_data(bufferlist& bl,
off_t bl_ofs, off_t bl_len) {
INFO << "flight handling data from offset " <<
current_offset << " (" << bl_ofs << ") of size " << bl_len << dendl;
current_offset += bl_len;
if (temp_file.is_open()) {
bl.write_stream(temp_file);
if (current_offset >= expected_size) {
INFO << "data read is completed, current_offset=" <<
current_offset << ", expected_size=" << expected_size << dendl;
temp_file.close();
std::shared_ptr<const arw::KeyValueMetadata> kv_metadata;
std::shared_ptr<arw::Schema> aw_schema;
int64_t num_rows = 0;
auto process_metadata = [&aw_schema, &num_rows, &kv_metadata, this]() -> arrow::Status {
ARROW_ASSIGN_OR_RAISE(std::shared_ptr<arrow::io::ReadableFile> file,
arrow::io::ReadableFile::Open(temp_file_name));
const std::shared_ptr<parquet::FileMetaData> metadata = parquet::ReadMetaData(file);
file->Close();
num_rows = metadata->num_rows();
kv_metadata = metadata->key_value_metadata();
const parquet::SchemaDescriptor* pq_schema = metadata->schema();
ARROW_RETURN_NOT_OK(parquet::arrow::FromParquetSchema(pq_schema, &aw_schema));
return arrow::Status::OK();
};
schema_status = process_metadata();
if (!schema_status.ok()) {
ERROR << "reading metadata to access schema, error=" << schema_status << dendl;
} else {
// INFO << "arrow_schema=" << *aw_schema << dendl;
FlightStore* store = penv.flight_store;
auto key =
store->add_flight(FlightData(uri, tenant_name, bucket_name,
object_key, num_rows,
expected_size, aw_schema,
kv_metadata, user_id));
(void) key; // suppress unused variable warning
}
} // if last block
} // if file opened
// chain to next filter in stream
int ret = RGWGetObj_Filter::handle_data(bl, bl_ofs, bl_len);
return ret;
}
#if 0
void code_snippets() {
INFO << "num_columns:" << md->num_columns() <<
" num_schema_elements:" << md->num_schema_elements() <<
" num_rows:" << md->num_rows() <<
" num_row_groups:" << md->num_row_groups() << dendl;
INFO << "file schema: name=" << schema1->name() << ", ToString:" << schema1->ToString() << ", num_columns=" << schema1->num_columns() << dendl;
for (int c = 0; c < schema1->num_columns(); ++c) {
const parquet::ColumnDescriptor* cd = schema1->Column(c);
// const parquet::ConvertedType::type t = cd->converted_type;
const std::shared_ptr<const parquet::LogicalType> lt = cd->logical_type();
INFO << "column " << c << ": name=" << cd->name() << ", ToString=" << cd->ToString() << ", logical_type=" << lt->ToString() << dendl;
}
INFO << "There are " << md->num_rows() << " rows and " << md->num_row_groups() << " row groups" << dendl;
for (int rg = 0; rg < md->num_row_groups(); ++rg) {
INFO << "Row Group " << rg << dendl;
auto rg_md = md->RowGroup(rg);
auto schema2 = rg_md->schema();
}
}
#endif
} // namespace rgw::flight
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