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-rw-r--r--src/rgw/rgw_flight.cc724
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diff --git a/src/rgw/rgw_flight.cc b/src/rgw/rgw_flight.cc
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+++ b/src/rgw/rgw_flight.cc
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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 <iostream>
+#include <fstream>
+#include <mutex>
+#include <map>
+#include <algorithm>
+
+#include "arrow/type.h"
+#include "arrow/buffer.h"
+#include "arrow/util/string_view.h"
+#include "arrow/io/interfaces.h"
+#include "arrow/ipc/reader.h"
+#include "arrow/table.h"
+
+#include "arrow/flight/server.h"
+
+#include "parquet/arrow/reader.h"
+
+#include "common/dout.h"
+#include "rgw_op.h"
+
+#include "rgw_flight.h"
+#include "rgw_flight_frontend.h"
+
+
+namespace rgw::flight {
+
+// Ticket and FlightKey
+
+std::atomic<FlightKey> next_flight_key = null_flight_key;
+
+flt::Ticket FlightKeyToTicket(const FlightKey& key) {
+ flt::Ticket result;
+ result.ticket = std::to_string(key);
+ return result;
+}
+
+arw::Result<FlightKey> TicketToFlightKey(const flt::Ticket& t) {
+ try {
+ return (FlightKey) std::stoul(t.ticket);
+ } catch (std::invalid_argument const& ex) {
+ return arw::Status::Invalid(
+ "could not convert Ticket containing \"%s\" into a Flight Key",
+ t.ticket);
+ } catch (const std::out_of_range& ex) {
+ return arw::Status::Invalid(
+ "could not convert Ticket containing \"%s\" into a Flight Key due to range",
+ t.ticket);
+ }
+}
+
+// FlightData
+
+FlightData::FlightData(const std::string& _uri,
+ const std::string& _tenant_name,
+ const std::string& _bucket_name,
+ const rgw_obj_key& _object_key,
+ uint64_t _num_records,
+ uint64_t _obj_size,
+ std::shared_ptr<arw::Schema>& _schema,
+ std::shared_ptr<const arw::KeyValueMetadata>& _kv_metadata,
+ rgw_user _user_id) :
+ key(++next_flight_key),
+ /* expires(coarse_real_clock::now() + lifespan), */
+ uri(_uri),
+ tenant_name(_tenant_name),
+ bucket_name(_bucket_name),
+ object_key(_object_key),
+ num_records(_num_records),
+ obj_size(_obj_size),
+ schema(_schema),
+ kv_metadata(_kv_metadata),
+ user_id(_user_id)
+{ }
+
+/**** FlightStore ****/
+
+FlightStore::FlightStore(const DoutPrefix& _dp) :
+ dp(_dp)
+{ }
+
+FlightStore::~FlightStore() { }
+
+/**** MemoryFlightStore ****/
+
+MemoryFlightStore::MemoryFlightStore(const DoutPrefix& _dp) :
+ FlightStore(_dp)
+{ }
+
+MemoryFlightStore::~MemoryFlightStore() { }
+
+FlightKey MemoryFlightStore::add_flight(FlightData&& flight) {
+ std::pair<decltype(map)::iterator,bool> result;
+ {
+ const std::lock_guard lock(mtx);
+ result = map.insert( {flight.key, std::move(flight)} );
+ }
+ ceph_assertf(result.second,
+ "unable to add FlightData to MemoryFlightStore"); // temporary until error handling
+
+ return result.first->second.key;
+}
+
+arw::Result<FlightData> MemoryFlightStore::get_flight(const FlightKey& key) const {
+ const std::lock_guard lock(mtx);
+ auto i = map.find(key);
+ if (i == map.cend()) {
+ return arw::Status::KeyError("could not find Flight with Key %" PRIu32,
+ key);
+ } else {
+ return i->second;
+ }
+}
+
+// returns either the next FilghtData or, if at end, empty optional
+std::optional<FlightData> MemoryFlightStore::after_key(const FlightKey& key) const {
+ std::optional<FlightData> result;
+ {
+ const std::lock_guard lock(mtx);
+ auto i = map.upper_bound(key);
+ if (i != map.end()) {
+ result = i->second;
+ }
+ }
+ return result;
+}
+
+int MemoryFlightStore::remove_flight(const FlightKey& key) {
+ return 0;
+}
+
+int MemoryFlightStore::expire_flights() {
+ return 0;
+}
+
+/**** FlightServer ****/
+
+FlightServer::FlightServer(RGWProcessEnv& _env,
+ FlightStore* _flight_store,
+ const DoutPrefix& _dp) :
+ env(_env),
+ driver(env.driver),
+ dp(_dp),
+ flight_store(_flight_store)
+{ }
+
+FlightServer::~FlightServer()
+{ }
+
+
+arw::Status FlightServer::ListFlights(const flt::ServerCallContext& context,
+ const flt::Criteria* criteria,
+ std::unique_ptr<flt::FlightListing>* listings) {
+
+ // function local class to implement FlightListing interface
+ class RGWFlightListing : public flt::FlightListing {
+
+ FlightStore* flight_store;
+ FlightKey previous_key;
+
+ public:
+
+ RGWFlightListing(FlightStore* flight_store) :
+ flight_store(flight_store),
+ previous_key(null_flight_key)
+ { }
+
+ arw::Status Next(std::unique_ptr<flt::FlightInfo>* info) {
+ std::optional<FlightData> fd = flight_store->after_key(previous_key);
+ if (fd) {
+ previous_key = fd->key;
+ auto descriptor =
+ flt::FlightDescriptor::Path(
+ { fd->tenant_name, fd->bucket_name, fd->object_key.name, fd->object_key.instance, fd->object_key.ns });
+ flt::FlightEndpoint endpoint;
+ endpoint.ticket = FlightKeyToTicket(fd->key);
+ std::vector<flt::FlightEndpoint> endpoints { endpoint };
+
+ ARROW_ASSIGN_OR_RAISE(flt::FlightInfo info_obj,
+ flt::FlightInfo::Make(*fd->schema, descriptor, endpoints, fd->num_records, fd->obj_size));
+ *info = std::make_unique<flt::FlightInfo>(std::move(info_obj));
+ return arw::Status::OK();
+ } else {
+ *info = nullptr;
+ return arw::Status::OK();
+ }
+ }
+ }; // class RGWFlightListing
+
+ *listings = std::make_unique<RGWFlightListing>(flight_store);
+ return arw::Status::OK();
+} // FlightServer::ListFlights
+
+
+arw::Status FlightServer::GetFlightInfo(const flt::ServerCallContext &context,
+ const flt::FlightDescriptor &request,
+ std::unique_ptr<flt::FlightInfo> *info) {
+ return arw::Status::OK();
+} // FlightServer::GetFlightInfo
+
+
+arw::Status FlightServer::GetSchema(const flt::ServerCallContext &context,
+ const flt::FlightDescriptor &request,
+ std::unique_ptr<flt::SchemaResult> *schema) {
+ return arw::Status::OK();
+} // FlightServer::GetSchema
+
+ // A Buffer that owns its memory and frees it when the Buffer is
+ // destructed
+class OwnedBuffer : public arw::Buffer {
+
+ uint8_t* buffer;
+
+protected:
+
+ OwnedBuffer(uint8_t* _buffer, int64_t _size) :
+ Buffer(_buffer, _size),
+ buffer(_buffer)
+ { }
+
+public:
+
+ ~OwnedBuffer() override {
+ delete[] buffer;
+ }
+
+ static arw::Result<std::shared_ptr<OwnedBuffer>> make(int64_t size) {
+ uint8_t* buffer = new (std::nothrow) uint8_t[size];
+ if (!buffer) {
+ return arw::Status::OutOfMemory("could not allocated buffer of size %" PRId64, size);
+ }
+
+ OwnedBuffer* ptr = new OwnedBuffer(buffer, size);
+ std::shared_ptr<OwnedBuffer> result;
+ result.reset(ptr);
+ return result;
+ }
+
+ // if what's read in is less than capacity
+ void set_size(int64_t size) {
+ size_ = size;
+ }
+
+ // pointer that can be used to write into buffer
+ uint8_t* writeable_data() {
+ return buffer;
+ }
+}; // class OwnedBuffer
+
+#if 0 // remove classes used for testing and incrementally building
+
+// make local to DoGet eventually
+class LocalInputStream : public arw::io::InputStream {
+
+ std::iostream::pos_type position;
+ std::fstream file;
+ std::shared_ptr<const arw::KeyValueMetadata> kv_metadata;
+ const DoutPrefix dp;
+
+public:
+
+ LocalInputStream(std::shared_ptr<const arw::KeyValueMetadata> _kv_metadata,
+ const DoutPrefix _dp) :
+ kv_metadata(_kv_metadata),
+ dp(_dp)
+ {}
+
+ arw::Status Open() {
+ file.open("/tmp/green_tripdata_2022-04.parquet", std::ios::in);
+ if (!file.good()) {
+ return arw::Status::IOError("unable to open file");
+ }
+
+ INFO << "file opened successfully" << dendl;
+ position = file.tellg();
+ return arw::Status::OK();
+ }
+
+ arw::Status Close() override {
+ file.close();
+ INFO << "file closed" << dendl;
+ return arw::Status::OK();
+ }
+
+ arw::Result<int64_t> Tell() const override {
+ if (position < 0) {
+ return arw::Status::IOError(
+ "could not query file implementaiton with tellg");
+ } else {
+ return int64_t(position);
+ }
+ }
+
+ bool closed() const override {
+ return file.is_open();
+ }
+
+ arw::Result<int64_t> Read(int64_t nbytes, void* out) override {
+ INFO << "entered: asking for " << nbytes << " bytes" << dendl;
+ if (file.read(reinterpret_cast<char*>(out),
+ reinterpret_cast<std::streamsize>(nbytes))) {
+ const std::streamsize bytes_read = file.gcount();
+ INFO << "Point A: read bytes " << bytes_read << dendl;
+ position = file.tellg();
+ return bytes_read;
+ } else {
+ ERROR << "unable to read from file" << dendl;
+ return arw::Status::IOError("unable to read from offset %" PRId64,
+ int64_t(position));
+ }
+ }
+
+ arw::Result<std::shared_ptr<arw::Buffer>> Read(int64_t nbytes) override {
+ INFO << "entered: " << ": asking for " << nbytes << " bytes" << dendl;
+
+ std::shared_ptr<OwnedBuffer> buffer;
+ ARROW_ASSIGN_OR_RAISE(buffer, OwnedBuffer::make(nbytes));
+
+ if (file.read(reinterpret_cast<char*>(buffer->writeable_data()),
+ reinterpret_cast<std::streamsize>(nbytes))) {
+ const auto bytes_read = file.gcount();
+ INFO << "Point B: read bytes " << bytes_read << dendl;
+ // buffer->set_size(bytes_read);
+ position = file.tellg();
+ return buffer;
+ } else if (file.rdstate() & std::ifstream::failbit &&
+ file.rdstate() & std::ifstream::eofbit) {
+ const auto bytes_read = file.gcount();
+ INFO << "3 read bytes " << bytes_read << " and reached EOF" << dendl;
+ // buffer->set_size(bytes_read);
+ position = file.tellg();
+ return buffer;
+ } else {
+ ERROR << "unable to read from file" << dendl;
+ return arw::Status::IOError("unable to read from offset %ld", position);
+ }
+ }
+
+ arw::Result<arw::util::string_view> Peek(int64_t nbytes) override {
+ INFO << "called, not implemented" << dendl;
+ return arw::Status::NotImplemented("peek not currently allowed");
+ }
+
+ bool supports_zero_copy() const override {
+ return false;
+ }
+
+ arw::Result<std::shared_ptr<const arw::KeyValueMetadata>> ReadMetadata() override {
+ INFO << "called" << dendl;
+ return kv_metadata;
+ }
+}; // class LocalInputStream
+
+class LocalRandomAccessFile : public arw::io::RandomAccessFile {
+
+ FlightData flight_data;
+ const DoutPrefix dp;
+
+ std::iostream::pos_type position;
+ std::fstream file;
+
+public:
+ LocalRandomAccessFile(const FlightData& _flight_data, const DoutPrefix _dp) :
+ flight_data(_flight_data),
+ dp(_dp)
+ { }
+
+ // implement InputStream
+
+ arw::Status Open() {
+ file.open("/tmp/green_tripdata_2022-04.parquet", std::ios::in);
+ if (!file.good()) {
+ return arw::Status::IOError("unable to open file");
+ }
+
+ INFO << "file opened successfully" << dendl;
+ position = file.tellg();
+ return arw::Status::OK();
+ }
+
+ arw::Status Close() override {
+ file.close();
+ INFO << "file closed" << dendl;
+ return arw::Status::OK();
+ }
+
+ arw::Result<int64_t> Tell() const override {
+ if (position < 0) {
+ return arw::Status::IOError(
+ "could not query file implementaiton with tellg");
+ } else {
+ return int64_t(position);
+ }
+ }
+
+ bool closed() const override {
+ return file.is_open();
+ }
+
+ arw::Result<int64_t> Read(int64_t nbytes, void* out) override {
+ INFO << "entered: asking for " << nbytes << " bytes" << dendl;
+ if (file.read(reinterpret_cast<char*>(out),
+ reinterpret_cast<std::streamsize>(nbytes))) {
+ const std::streamsize bytes_read = file.gcount();
+ INFO << "Point A: read bytes " << bytes_read << dendl;
+ position = file.tellg();
+ return bytes_read;
+ } else {
+ ERROR << "unable to read from file" << dendl;
+ return arw::Status::IOError("unable to read from offset %" PRId64,
+ int64_t(position));
+ }
+ }
+
+ arw::Result<std::shared_ptr<arw::Buffer>> Read(int64_t nbytes) override {
+ INFO << "entered: asking for " << nbytes << " bytes" << dendl;
+
+ std::shared_ptr<OwnedBuffer> buffer;
+ ARROW_ASSIGN_OR_RAISE(buffer, OwnedBuffer::make(nbytes));
+
+ if (file.read(reinterpret_cast<char*>(buffer->writeable_data()),
+ reinterpret_cast<std::streamsize>(nbytes))) {
+ const auto bytes_read = file.gcount();
+ INFO << "Point B: read bytes " << bytes_read << dendl;
+ // buffer->set_size(bytes_read);
+ position = file.tellg();
+ return buffer;
+ } else if (file.rdstate() & std::ifstream::failbit &&
+ file.rdstate() & std::ifstream::eofbit) {
+ const auto bytes_read = file.gcount();
+ INFO << "3 read bytes " << bytes_read << " and reached EOF" << dendl;
+ // buffer->set_size(bytes_read);
+ position = file.tellg();
+ return buffer;
+ } else {
+ ERROR << "unable to read from file" << dendl;
+ return arw::Status::IOError("unable to read from offset %ld", position);
+ }
+ }
+
+ bool supports_zero_copy() const override {
+ return false;
+ }
+
+ // implement Seekable
+
+ arw::Result<int64_t> GetSize() override {
+ return flight_data.obj_size;
+ }
+
+ arw::Result<arw::util::string_view> Peek(int64_t nbytes) override {
+ std::iostream::pos_type here = file.tellg();
+ if (here == -1) {
+ return arw::Status::IOError(
+ "unable to determine current position ahead of peek");
+ }
+
+ ARROW_ASSIGN_OR_RAISE(OwningStringView result,
+ OwningStringView::make(nbytes));
+
+ // read
+ ARROW_ASSIGN_OR_RAISE(int64_t bytes_read,
+ Read(nbytes, (void*) result.writeable_data()));
+ (void) bytes_read; // silence unused variable warnings
+
+ // return offset to original
+ ARROW_RETURN_NOT_OK(Seek(here));
+
+ return result;
+ }
+
+ arw::Result<std::shared_ptr<const arw::KeyValueMetadata>> ReadMetadata() {
+ return flight_data.kv_metadata;
+ }
+
+ arw::Future<std::shared_ptr<const arw::KeyValueMetadata>> ReadMetadataAsync(
+ const arw::io::IOContext& io_context) override {
+ return arw::Future<std::shared_ptr<const arw::KeyValueMetadata>>::MakeFinished(ReadMetadata());
+ }
+
+ // implement Seekable interface
+
+ arw::Status Seek(int64_t position) {
+ file.seekg(position);
+ if (file.fail()) {
+ return arw::Status::IOError(
+ "error encountered during seek to %" PRId64, position);
+ } else {
+ return arw::Status::OK();
+ }
+ }
+}; // class LocalRandomAccessFile
+#endif
+
+class RandomAccessObject : public arw::io::RandomAccessFile {
+
+ FlightData flight_data;
+ const DoutPrefix dp;
+
+ int64_t position;
+ bool is_closed;
+ std::unique_ptr<rgw::sal::Object::ReadOp> op;
+
+public:
+
+ RandomAccessObject(const FlightData& _flight_data,
+ std::unique_ptr<rgw::sal::Object>& obj,
+ const DoutPrefix _dp) :
+ flight_data(_flight_data),
+ dp(_dp),
+ position(-1),
+ is_closed(false)
+ {
+ op = obj->get_read_op();
+ }
+
+ arw::Status Open() {
+ int ret = op->prepare(null_yield, &dp);
+ if (ret < 0) {
+ return arw::Status::IOError(
+ "unable to prepare object with error %d", ret);
+ }
+ INFO << "file opened successfully" << dendl;
+ position = 0;
+ return arw::Status::OK();
+ }
+
+ // implement InputStream
+
+ arw::Status Close() override {
+ position = -1;
+ is_closed = true;
+ (void) op.reset();
+ INFO << "object closed" << dendl;
+ return arw::Status::OK();
+ }
+
+ arw::Result<int64_t> Tell() const override {
+ if (position < 0) {
+ return arw::Status::IOError("could not determine position");
+ } else {
+ return position;
+ }
+ }
+
+ bool closed() const override {
+ return is_closed;
+ }
+
+ arw::Result<int64_t> Read(int64_t nbytes, void* out) override {
+ INFO << "entered: asking for " << nbytes << " bytes" << dendl;
+
+ if (position < 0) {
+ ERROR << "error, position indicated error" << dendl;
+ return arw::Status::IOError("object read op is in bad state");
+ }
+
+ // note: read function reads through end_position inclusive
+ int64_t end_position = position + nbytes - 1;
+
+ bufferlist bl;
+
+ const int64_t bytes_read =
+ op->read(position, end_position, bl, null_yield, &dp);
+ if (bytes_read < 0) {
+ const int64_t former_position = position;
+ position = -1;
+ ERROR << "read operation returned " << bytes_read << dendl;
+ return arw::Status::IOError(
+ "unable to read object at position %" PRId64 ", error code: %" PRId64,
+ former_position,
+ bytes_read);
+ }
+
+ // TODO: see if there's a way to get rid of this copy, perhaps
+ // updating rgw::sal::read_op
+ bl.cbegin().copy(bytes_read, reinterpret_cast<char*>(out));
+
+ position += bytes_read;
+
+ if (nbytes != bytes_read) {
+ INFO << "partial read: nbytes=" << nbytes <<
+ ", bytes_read=" << bytes_read << dendl;
+ }
+ INFO << bytes_read << " bytes read" << dendl;
+ return bytes_read;
+ }
+
+ arw::Result<std::shared_ptr<arw::Buffer>> Read(int64_t nbytes) override {
+ INFO << "entered: asking for " << nbytes << " bytes" << dendl;
+
+ std::shared_ptr<OwnedBuffer> buffer;
+ ARROW_ASSIGN_OR_RAISE(buffer, OwnedBuffer::make(nbytes));
+
+ ARROW_ASSIGN_OR_RAISE(const int64_t bytes_read,
+ Read(nbytes, buffer->writeable_data()));
+ buffer->set_size(bytes_read);
+
+ return buffer;
+ }
+
+ bool supports_zero_copy() const override {
+ return false;
+ }
+
+ // implement Seekable
+
+ arw::Result<int64_t> GetSize() override {
+ INFO << "entered: " << flight_data.obj_size << " returned" << dendl;
+ return flight_data.obj_size;
+ }
+
+ arw::Result<arw::util::string_view> Peek(int64_t nbytes) override {
+ INFO << "entered: " << nbytes << " bytes" << dendl;
+
+ int64_t saved_position = position;
+
+ ARROW_ASSIGN_OR_RAISE(OwningStringView buffer,
+ OwningStringView::make(nbytes));
+
+ ARROW_ASSIGN_OR_RAISE(const int64_t bytes_read,
+ Read(nbytes, (void*) buffer.writeable_data()));
+
+ // restore position for a peek
+ position = saved_position;
+
+ if (bytes_read < nbytes) {
+ // create new OwningStringView with moved buffer
+ return OwningStringView::shrink(std::move(buffer), bytes_read);
+ } else {
+ return buffer;
+ }
+ }
+
+ arw::Result<std::shared_ptr<const arw::KeyValueMetadata>> ReadMetadata() {
+ return flight_data.kv_metadata;
+ }
+
+ arw::Future<std::shared_ptr<const arw::KeyValueMetadata>> ReadMetadataAsync(
+ const arw::io::IOContext& io_context) override {
+ return arw::Future<std::shared_ptr<const arw::KeyValueMetadata>>::MakeFinished(ReadMetadata());
+ }
+
+ // implement Seekable interface
+
+ arw::Status Seek(int64_t new_position) {
+ INFO << "entered: position: " << new_position << dendl;
+ if (position < 0) {
+ ERROR << "error, position indicated error" << dendl;
+ return arw::Status::IOError("object read op is in bad state");
+ } else {
+ position = new_position;
+ return arw::Status::OK();
+ }
+ }
+}; // class RandomAccessObject
+
+arw::Status FlightServer::DoGet(const flt::ServerCallContext &context,
+ const flt::Ticket &request,
+ std::unique_ptr<flt::FlightDataStream> *stream) {
+ int ret;
+
+ ARROW_ASSIGN_OR_RAISE(FlightKey key, TicketToFlightKey(request));
+ ARROW_ASSIGN_OR_RAISE(FlightData fd, get_flight_store()->get_flight(key));
+
+ std::unique_ptr<rgw::sal::User> user = driver->get_user(fd.user_id);
+ if (user->empty()) {
+ INFO << "user is empty" << dendl;
+ } else {
+ // TODO: test what happens if user is not loaded
+ ret = user->load_user(&dp, null_yield);
+ if (ret < 0) {
+ ERROR << "load_user returned " << ret << dendl;
+ // TODO return something
+ }
+ INFO << "user is " << user->get_display_name() << dendl;
+ }
+
+ std::unique_ptr<rgw::sal::Bucket> bucket;
+
+ ret = driver->get_bucket(&dp, &(*user), fd.tenant_name, fd.bucket_name,
+ &bucket, null_yield);
+ if (ret < 0) {
+ ERROR << "get_bucket returned " << ret << dendl;
+ // TODO return something
+ }
+
+ std::unique_ptr<rgw::sal::Object> object = bucket->get_object(fd.object_key);
+
+ auto input = std::make_shared<RandomAccessObject>(fd, object, dp);
+ ARROW_RETURN_NOT_OK(input->Open());
+
+ std::unique_ptr<parquet::arrow::FileReader> reader;
+ ARROW_RETURN_NOT_OK(parquet::arrow::OpenFile(input,
+ arw::default_memory_pool(),
+ &reader));
+
+ std::shared_ptr<arrow::Table> table;
+ ARROW_RETURN_NOT_OK(reader->ReadTable(&table));
+
+ std::vector<std::shared_ptr<arw::RecordBatch>> batches;
+ arw::TableBatchReader batch_reader(*table);
+ ARROW_RETURN_NOT_OK(batch_reader.ReadAll(&batches));
+
+ ARROW_ASSIGN_OR_RAISE(auto owning_reader,
+ arw::RecordBatchReader::Make(
+ std::move(batches), table->schema()));
+ *stream = std::unique_ptr<flt::FlightDataStream>(
+ new flt::RecordBatchStream(owning_reader));
+
+ return arw::Status::OK();
+} // flightServer::DoGet
+
+} // namespace rgw::flight
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