Simplified distributed block storage with strong consistency, like in Ceph
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// Copyright (c) Vitaliy Filippov, 2019+
// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
#pragma once
#include "json11/json11.hpp"
#include "osd_id.h"
#include "timerfd_manager.h"
#define ETCD_CONFIG_WATCH_ID 1
#define ETCD_PG_STATE_WATCH_ID 2
#define ETCD_PG_HISTORY_WATCH_ID 3
#define ETCD_OSD_STATE_WATCH_ID 4
#define DEFAULT_BLOCK_SIZE 128*1024
struct etcd_kv_t
{
std::string key;
json11::Json value;
uint64_t mod_revision;
};
struct pg_config_t
{
bool exists;
osd_num_t primary;
std::vector<osd_num_t> target_set;
std::vector<std::vector<osd_num_t>> target_history;
std::vector<osd_num_t> all_peers;
bool pause;
osd_num_t cur_primary;
int cur_state;
uint64_t epoch;
};
struct pool_config_t
{
bool exists;
pool_id_t id;
std::string name;
uint64_t scheme;
uint64_t pg_size, pg_minsize, parity_chunks;
uint64_t pg_count;
uint64_t real_pg_count;
std::string failure_domain;
uint64_t max_osd_combinations;
uint64_t pg_stripe_size;
std::map<pg_num_t, pg_config_t> pg_config;
};
struct inode_config_t
{
uint64_t num;
std::string name;
uint64_t size;
inode_t parent_id;
bool readonly;
// Arbitrary metadata
json11::Json meta;
// Change revision of the metadata in etcd
uint64_t mod_revision;
};
struct inode_watch_t
{
std::string name;
inode_config_t cfg;
};
struct http_co_t;
struct etcd_state_client_t
{
protected:
std::vector<std::string> local_ips;
std::vector<std::string> etcd_addresses;
std::vector<std::string> etcd_local;
std::string selected_etcd_address;
std::vector<std::string> addresses_to_try;
std::vector<inode_watch_t*> watches;
http_co_t *etcd_watch_ws = NULL, *keepalive_client = NULL;
int ws_keepalive_timer = -1;
int ws_alive = 0;
bool rand_initialized = false;
uint64_t bs_block_size = DEFAULT_BLOCK_SIZE;
void add_etcd_url(std::string);
void pick_next_etcd();
public:
int etcd_keepalive_timeout = 30;
int etcd_ws_keepalive_interval = 30;
int max_etcd_attempts = 5;
int etcd_quick_timeout = 1000;
int etcd_slow_timeout = 5000;
std::string etcd_prefix;
int log_level = 0;
timerfd_manager_t *tfd = NULL;
int etcd_watches_initialised = 0;
uint64_t etcd_watch_revision = 0;
std::map<pool_id_t, pool_config_t> pool_config;
std::map<osd_num_t, json11::Json> peer_states;
std::map<inode_t, inode_config_t> inode_config;
std::map<std::string, inode_t> inode_by_name;
std::function<void(std::map<std::string, etcd_kv_t> &)> on_change_hook;
std::function<void(json11::Json::object &)> on_load_config_hook;
std::function<json11::Json()> load_pgs_checks_hook;
std::function<void(bool)> on_load_pgs_hook;
std::function<void(pool_id_t, pg_num_t)> on_change_pg_history_hook;
std::function<void(osd_num_t)> on_change_osd_state_hook;
std::function<void()> on_reload_hook;
std::function<void(inode_t, bool)> on_inode_change_hook;
std::function<void(http_co_t *)> on_start_watcher_hook;
json11::Json::object serialize_inode_cfg(inode_config_t *cfg);
etcd_kv_t parse_etcd_kv(const json11::Json & kv_json);
std::vector<std::string> get_addresses();
void etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload, int timeout, std::function<void(std::string, json11::Json)> callback);
void etcd_call(std::string api, json11::Json payload, int timeout, int retries, int interval, std::function<void(std::string, json11::Json)> callback);
void etcd_txn(json11::Json txn, int timeout, int retries, int interval, std::function<void(std::string, json11::Json)> callback);
void etcd_txn_slow(json11::Json txn, std::function<void(std::string, json11::Json)> callback);
void start_etcd_watcher();
void load_global_config();
void load_pgs();
void parse_state(const etcd_kv_t & kv);
void parse_config(const json11::Json & config);
void insert_inode_config(const inode_config_t & cfg);
inode_watch_t* watch_inode(std::string name);
void close_watch(inode_watch_t* watch);
int address_count();
~etcd_state_client_t();
};