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node_cfg.ml
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node_cfg.ml
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(*
Copyright (2010-2014) INCUBAID BVBA
Licensed 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.
*)
let section = Logger.Section.main
let config_file = ref "cfg/arakoon.ini"
let default_lease_period = 10
let default_max_value_size = 8 * 1024 * 1024
let default_max_buffer_size = 32 * 1024 * 1024
let default_client_buffer_capacity = 32
let default_lcnum = 16384
let default_ncnum = 8192
open Master_type
open Client_cfg
exception InvalidHomeDir of string
exception InvalidTlogDir of string
exception InvalidTlxDir of string
exception InvalidHeadDir of string
module TLSConfig = struct
type path = string
type cipher_list = string
module Cluster : sig
type t
val make : ca_cert:path
-> service:bool
-> service_validate_peer:bool
-> protocol:Ssl.protocol
-> cipher_list:cipher_list option
-> t
val ca_cert : t -> path
val service : t -> bool
val service_validate_peer : t -> bool
val protocol : t -> Ssl.protocol
val cipher_list : t -> cipher_list option
val to_string : t -> string
end = struct
type t = { ca_cert : path
; service : bool
; service_validate_peer : bool
; protocol : Ssl.protocol
; cipher_list : cipher_list option
}
let make ~ca_cert ~service ~service_validate_peer ~protocol ~cipher_list =
{ ca_cert; service; service_validate_peer; protocol; cipher_list }
let ca_cert t = t.ca_cert
let service t = t.service
let service_validate_peer t = t.service_validate_peer
let protocol t = t.protocol
let cipher_list t = t.cipher_list
let to_string t =
let open To_string in
record [ "ca_cert", string t.ca_cert
; "service", bool t.service
; "service_validate_peer", bool t.service_validate_peer
; "protocol", begin match t.protocol with
| Ssl.SSLv23 -> "SSLv23"
| Ssl.SSLv3 -> "SSLv3"
| Ssl.TLSv1 -> "TLSv1"
| Ssl.TLSv1_1 -> "TLSv1_1"
| Ssl.TLSv1_2 -> "TLSv1_2"
end
; "cipher_list", option string t.cipher_list
]
end
module Node : sig
type t
val make : cert:path -> key:path -> t
val cert : t -> path
val key : t -> path
val to_string : t -> string
end = struct
type t = { cert : path
; key : path
}
let make ~cert ~key = { cert; key }
let cert t = t.cert
let key t = t.key
let to_string t =
let open To_string in
record [ "cert", string t.cert
; "key", string t.key
]
end
end
module Node_cfg = struct
type t = {node_name:string;
ips: string list;
client_port:int;
messaging_port:int;
home:string;
tlog_dir:string;
tlx_dir:string;
head_dir:string;
log_dir:string;
log_level:string;
log_config:string option;
batched_transaction_config:string option;
lease_period:int;
master: master;
is_laggy : bool;
is_learner : bool;
is_witness : bool;
targets : string list;
compressor : Compression.compressor;
fsync : bool;
_fsync_tlog_dir : bool;
is_test : bool;
reporting: int;
node_tls : TLSConfig.Node.t option;
collapse_slowdown : float option;
}
let string_of t =
let open To_string in
record [ "node_name", string t.node_name
; "ips", list string t.ips
; "client_port", int t.client_port
; "messaging_port", int t.messaging_port
; "home", string t.home
; "tlog_dir", string t.tlog_dir
; "log_dir", string t.log_dir
; "tlx_dir", string t.tlx_dir
; "head_dir", string t.head_dir
; "log_level", string t.log_level
; "log_config", option string t.log_config
; "batched_transaction_config", option string t.batched_transaction_config
; "lease_period", int t.lease_period
; "master", string (master2s t.master)
; "is_laggy", bool t.is_laggy
; "is_learner", bool t.is_learner
; "is_witness", bool t.is_witness
; "targets", list id t.targets
; "compressor", Compression.compressor2s t.compressor
; "fsync", bool t.fsync
; "is_test", bool t.is_test
; "reporting", int t.reporting
; "_fsync_tlog_dir", bool t._fsync_tlog_dir
; "node_tls", option TLSConfig.Node.to_string t.node_tls
; "collapse_slowdown", option To_string.float t.collapse_slowdown
]
type log_cfg =
{
client_protocol: string option;
paxos: string option;
tcp_messaging: string option;
}
let string_of_log_cfg lcfg =
let open To_string in
record [ "client_protocol", option string lcfg.client_protocol
; "paxos", option string lcfg.paxos
; "tcp_messaging", option string lcfg.tcp_messaging
]
let get_default_log_config () =
{
client_protocol = None;
paxos = None;
tcp_messaging = None;
}
type batched_transaction_cfg =
{
max_entries : int option;
max_size : int option;
}
let string_of_btc (btc:batched_transaction_cfg) =
let open To_string in
record [ "max_entries", option int btc.max_entries
; "max_size", option int btc.max_size
]
let get_default_batched_transaction_config () =
{
max_entries = None;
max_size = None;
}
type cluster_cfg =
{
cfgs: t list;
log_cfgs: (string * log_cfg) list;
batched_transaction_cfgs : (string * batched_transaction_cfg) list;
_master: master;
quorum_function: int -> int;
_lease_period: int;
cluster_id : string;
plugins: string list;
nursery_cfg : (string*ClientCfg.t) option;
overwrite_tlog_entries: int option;
max_value_size: int;
max_buffer_size: int;
client_buffer_capacity: int;
lcnum : int; (* tokyo cabinet: leaf nodes in cache *)
ncnum : int; (* tokyo cabinet: internal nodes in cache *)
tls : TLSConfig.Cluster.t option;
}
let string_of_cluster_cfg c =
let open To_string in
record [ "cfgs", list string_of c.cfgs
; "log_cfgs", list (pair string string_of_log_cfg) c.log_cfgs
; "batched_transaction_cfgs", list (pair string string_of_btc) c.batched_transaction_cfgs
; "_master", master2s c._master
; "_lease_period", int c._lease_period
; "cluster_id", string c.cluster_id
; "plugins", list string c.plugins
; "nursery_cfg", option (pair string ClientCfg.to_string) c.nursery_cfg
; "overwrite_tlog_entries", option int c.overwrite_tlog_entries
; "max_value_size", int c.max_value_size
; "max_buffer_size", int c.max_buffer_size
; "client_buffer_capacity", int c.client_buffer_capacity
; "lcnum", int c.lcnum
; "ncnum", int c.ncnum
; "tls", option TLSConfig.Cluster.to_string c.tls
]
let make_test_config
?(base=4000) ?(cluster_id="ricky") ?(node_name = Printf.sprintf "t_arakoon_%i")
n_nodes master lease_period =
let make_one n =
let ns = (string_of_int n) in
let home = ":MEM#t_arakoon_" ^ ns in
{
node_name = node_name n;
ips = ["127.0.0.1"];
client_port = (base + n);
messaging_port = (base + 10 + n);
home = home;
tlog_dir = home;
tlx_dir = home;
head_dir = home;
log_dir = ":None";
log_level = "DEBUG";
log_config = Some "default_log_config";
batched_transaction_config = Some "default_batched_transaction_config";
lease_period = lease_period;
master = master;
is_laggy = false;
is_learner = false;
is_witness = false;
targets = [];
compressor = Compression.Snappy;
fsync = false;
_fsync_tlog_dir = false;
is_test = true;
reporting = 300;
node_tls = None;
collapse_slowdown = None;
}
in
let rec loop acc = function
| 0 -> acc
| n -> let o = make_one (n-1) in
loop (o::acc) (n-1)
in
let log_cfgs = [("default_log_config", get_default_log_config ())] in
let batched_transaction_cfgs = [("default_batched_transaction_config", get_default_batched_transaction_config ())] in
let cfgs = loop [] n_nodes in
let quorum_function = Quorum.quorum_function in
let overwrite_tlog_entries = None in
let cluster_cfg = {
cfgs;
log_cfgs;
batched_transaction_cfgs;
nursery_cfg = None;
_master = master;
quorum_function;
_lease_period = default_lease_period;
cluster_id;
plugins = [];
overwrite_tlog_entries;
max_value_size = default_max_value_size;
max_buffer_size = default_max_buffer_size;
client_buffer_capacity = default_client_buffer_capacity;
lcnum = default_lcnum;
ncnum = default_ncnum;
tls = None;
}
in
cluster_cfg
let _node_names inifile =
Ini.get inifile "global" "cluster" Ini.p_string_list Ini.required
let _ips inifile node_name =
Ini.get inifile node_name "ip" Ini.p_string_list Ini.required
let _tlog_entries_overwrite inifile =
Ini.get inifile "global" "__tainted_tlog_entries_per_file"
(Ini.p_option Ini.p_int )
(Ini.default None)
let _max_value_size inifile =
Ini.get inifile "global" "__tainted_max_value_size"
Ini.p_int (Ini.default (8 * 1024 * 1024))
let _max_buffer_size inifile =
Ini.get inifile "global" "__tainted_max_buffer_size"
Ini.p_int (Ini.default default_max_buffer_size)
let _plugins inifile =
Ini.get inifile "global" "plugins" Ini.p_string_list (Ini.default [])
let _get_lease_period inifile =
Ini.get inifile "global" "lease_period"
Ini.p_int (Ini.default default_lease_period)
let _get_bool inifile node_section x =
Ini.get inifile node_section x Ini.p_bool (Ini.default false)
let _client_buffer_capacity inifile =
Ini.get inifile "global" "client_buffer_capacity"
Ini.p_int (Ini.default default_client_buffer_capacity)
let _lcnum inifile =
Ini.get inifile "global" "lcnum" Ini.p_int
(Ini.default default_lcnum)
let _ncnum inifile =
Ini.get inifile "global" "ncnum" Ini.p_int
(Ini.default default_ncnum)
let _startup_mode inifile =
let master =
try
let m_s = (inifile # getval "global" "master") in
if Ini.get inifile "global" "preferred_masters" (fun _ -> true) (fun _ _ -> false)
then
failwith ("'master' and 'preferred_masters' are incompatible")
else
let m = Scanf.sscanf m_s "%s" (fun s -> s) in
let nodes = _node_names inifile in
if not (List.mem m nodes)
then
failwith (Printf.sprintf "'%s' needs to have a config section [%s]" m m)
else
if _get_bool inifile "global" "preferred_master"
then (Preferred [m])
else (Forced m)
with (Inifiles.Invalid_element _) ->
let pms = Ini.get inifile "global" "preferred_masters" Ini.p_string_list (fun _ _ -> []) in
if pms <> []
then
Preferred pms
else
let read_only = _get_bool inifile "global" "readonly" in
if read_only
then ReadOnly
else Elected
in
master
let get_nursery_cfg inifile filename =
try
begin
let n_cluster_id = Ini.get inifile "nursery" "cluster_id" Ini.p_string Ini.required in
let cfg = ClientCfg.from_file "nursery" filename in
Some (n_cluster_id, cfg)
end
with _ -> None
let _get_cluster_id inifile =
try
let cids = inifile # getval "global" "cluster_id" in
Scanf.sscanf cids "%s" (fun s -> s)
with (Inifiles.Invalid_element _ ) -> failwith "config has no cluster_id"
let _get_quorum_function inifile =
let nodes = _node_names inifile in
let n_nodes = List.length nodes in
try
let qs = (inifile # getval "global" "quorum") in
let qi = Scanf.sscanf qs "%i" (fun i -> i) in
if 1 <= qi && qi <= n_nodes
then fun _n -> qi
else
let msg = Printf.sprintf "fixed quorum should be 1 <= %i <= %i"
qi n_nodes in
failwith msg
with (Inifiles.Invalid_element _) -> Quorum.quorum_function
let _log_config inifile log_name =
let get_log_level x =
let v = Ini.get inifile log_name x (Ini.p_option Ini.p_string) (Ini.default None) in
match v with
| None -> None
| Some v -> Some (String.lowercase v) in
let client_protocol = get_log_level "client_protocol" in
let paxos = get_log_level "paxos" in
let tcp_messaging = get_log_level "tcp_messaging" in
{
client_protocol;
paxos;
tcp_messaging;
}
let _batched_transaction_config inifile section_name =
let get_option_int x = Ini.get inifile section_name x (Ini.p_option Ini.p_int) (Ini.default None) in
let max_entries = get_option_int "max_entries" in
let max_size = get_option_int "max_size" in
{
max_entries;
max_size;
}
let _tls_ca_cert inifile =
Ini.get inifile "global" "tls_ca_cert" (Ini.p_option Ini.p_string) (Ini.default None)
let _tls_service inifile =
Ini.get inifile "global" "tls_service"
Ini.p_bool (Ini.default false)
let _tls_service_validate_peer inifile =
Ini.get inifile "global" "tls_service_validate_peer"
Ini.p_bool (Ini.default false)
let _tls_version inifile =
let s = Ini.get inifile "global" "tls_version" Ini.p_string (Ini.default "1.0") in
match s with
| "1.0" -> Ssl.TLSv1
| "1.1" -> Ssl.TLSv1_1
| "1.2" -> Ssl.TLSv1_2
| _ -> failwith "Invalid \"tls_version\" setting"
let _tls_cipher_list inifile =
Ini.get inifile "global" "tls_cipher_list"
(Ini.p_option Ini.p_string) (Ini.default None)
let _node_config inifile node_name master =
let get_string x = Ini.get inifile node_name x Ini.p_string Ini.required in
let get_bool x = _get_bool inifile node_name x in
let get_int x = Ini.get inifile node_name x Ini.p_int Ini.required in
let ips = _ips inifile node_name in
let client_port = get_int "client_port" in
let messaging_port = get_int "messaging_port" in
let home = get_string "home" in
let tlog_dir =
try get_string "tlog_dir"
with _ -> home
in
let tlx_dir =
let rec _find = function
| [] -> tlog_dir
| x :: xs -> try get_string x
with _ -> _find xs
in
_find ["tlx_dir";"tlf_dir"]
in
let head_dir =
try get_string "head_dir"
with _ -> tlx_dir
in
let log_level = String.lowercase (get_string "log_level") in
let log_config = Ini.get inifile node_name "log_config" (Ini.p_option Ini.p_string) (Ini.default None) in
let batched_transaction_config = Ini.get inifile node_name "batched_transaction_config" (Ini.p_option Ini.p_string) (Ini.default None) in
let is_laggy = get_bool "laggy" in
let is_learner = get_bool "learner" in
let is_witness = get_bool "witness" in
let compressor =
if get_bool "disable_tlog_compression"
then Compression.No
else
begin
let s = Ini.get inifile node_name "tlog_compression" Ini.p_string
(Ini.default "bz2")
in
match String.lowercase s with
| "snappy" -> Compression.Snappy
| "bz2" -> Compression.Bz2
| "none" -> Compression.No
| _ -> failwith (Printf.sprintf "no compressor named %s" s)
end
in
let fsync = Ini.get inifile node_name "fsync" Ini.p_bool (Ini.default true) in
let _fsync_tlog_dir = Ini.get
inifile
node_name
"__tainted_fsync_tlog_dir"
Ini.p_bool
(Ini.default true) in
let targets =
if is_learner
then Ini.get inifile node_name "targets" Ini.p_string_list Ini.required
else []
in
let lease_period = _get_lease_period inifile in
let log_dir =
try get_string "log_dir"
with _ -> home
in
let reporting = Ini.get inifile node_name "reporting" Ini.p_int (Ini.default 300) in
let get_string_option x = Ini.get inifile node_name x (Ini.p_option Ini.p_string) (Ini.default None) in
let tls_cert = get_string_option "tls_cert"
and tls_key = get_string_option "tls_key" in
let node_tls =
let msg = Printf.sprintf "%s: both tls_cert and tls_key should be provided" node_name in
match tls_cert with
| None -> begin match tls_key with
| None -> None
| Some _ -> failwith msg
end
| Some cert -> begin match tls_key with
| None -> failwith msg
| Some key -> Some (TLSConfig.Node.make ~cert ~key)
end
in
let collapse_slowdown = Ini.get inifile node_name "collapse_slowdown" (Ini.p_option Ini.p_float) (Ini.default None) in
{node_name;
ips;
client_port;
messaging_port;
home;
tlog_dir;
tlx_dir;
head_dir;
log_dir;
log_level;
log_config;
batched_transaction_config;
lease_period;
master;
is_laggy;
is_learner;
is_witness;
targets;
compressor;
fsync;
_fsync_tlog_dir;
is_test = false;
reporting;
node_tls;
collapse_slowdown;
}
let read_config config_file =
let inifile = new Inifiles.inifile config_file in
let fm = _startup_mode inifile in
let nodes = _node_names inifile in
let plugin_names = _plugins inifile in
let cfgs, remaining = List.fold_left
(fun (a,remaining) section ->
if List.mem section nodes || _get_bool inifile section "learner"
then
let cfg = _node_config inifile section fm in
let new_remaining = List.filter (fun x -> x <> section) remaining in
(cfg::a, new_remaining)
else (a,remaining))
([],nodes) (inifile # sects) in
let log_cfg_names = List.map (fun cfg -> cfg.log_config) cfgs in
let log_cfgs = List.fold_left
(fun a section ->
if List.mem (Some section) log_cfg_names
then
let log_cfg = _log_config inifile section in
(section, log_cfg)::a
else
a)
[] (inifile # sects) in
let batched_transaction_cfg_names = List.map (fun cfg -> cfg.batched_transaction_config) cfgs in
let batched_transaction_cfgs = List.fold_left
(fun a section ->
if List.mem (Some section) batched_transaction_cfg_names
then
let batched_transaction_cfg = _batched_transaction_config inifile section in
(section, batched_transaction_cfg)::a
else
a)
[] (inifile # sects) in
let () = if List.length remaining > 0 then
failwith ("Can't find config section for: " ^ (String.concat "," remaining))
in
let quorum_function = _get_quorum_function inifile in
let lease_period = _get_lease_period inifile in
let cluster_id = _get_cluster_id inifile in
let m_n_cfg = get_nursery_cfg inifile config_file in
let overwrite_tlog_entries = _tlog_entries_overwrite inifile in
let max_value_size = _max_value_size inifile in
let max_buffer_size = _max_buffer_size inifile in
let client_buffer_capacity = _client_buffer_capacity inifile in
let lcnum = _lcnum inifile in
let ncnum = _ncnum inifile in
let tls_ca_cert = _tls_ca_cert inifile in
let tls_service = _tls_service inifile in
let tls_service_validate_peer = _tls_service_validate_peer inifile in
let tls_version = _tls_version inifile in
let tls_cipher_list = _tls_cipher_list inifile in
let tls = match tls_ca_cert with
| None -> None
| Some ca_cert ->
let cfg = TLSConfig.Cluster.make
~ca_cert
~service:tls_service
~service_validate_peer:tls_service_validate_peer
~protocol:tls_version
~cipher_list:tls_cipher_list
in
Some cfg
in
let cluster_cfg =
{ cfgs;
log_cfgs;
batched_transaction_cfgs;
nursery_cfg = m_n_cfg;
_master = fm;
quorum_function;
_lease_period = lease_period;
cluster_id = cluster_id;
plugins = plugin_names;
overwrite_tlog_entries;
max_value_size;
max_buffer_size;
client_buffer_capacity;
lcnum;
ncnum;
tls;
}
in
cluster_cfg
let node_name t = t.node_name
let home t = t.home
let client_addresses t = (t.ips, t.client_port)
let get_master t = t.master
let get_node_cfgs_from_file () = read_config !config_file
let test ccfg ~cluster_id = ccfg.cluster_id = cluster_id
open Lwt
let validate_dirs t =
Logger.debug_ "Node_cfg.validate_dirs" >>= fun () ->
if t.is_test then Lwt.return ()
else
begin
let is_ok name =
try
let s = Unix.stat name in s.Unix.st_kind = Unix.S_DIR
with _ -> false
in
let verify_exists dir msg exn =
if not (is_ok dir)
then
begin
Logger.fatal_f_ "%s '%s' doesn't exist, or insufficient permissions" msg dir >>= fun () ->
Lwt.fail exn
end
else
Lwt.return ()
in
let verify_writable dir msg exn =
let handle_exn =
(* Work-around: Logger macro doesn't accept an 'exn' argument not
* called 'exn' *)
let log exn =
Logger.fatal_f_ ~exn "Failure while verifying %s '%s'" msg dir
in
function
(* Set of exceptions we map to some specific exit code *)
| Unix.Unix_error(Unix.EPERM, _, _)
| Unix.Unix_error(Unix.EACCES, _, _)
| Unix.Unix_error(Unix.EROFS, _, _)
| Unix.Unix_error(Unix.ENOSPC, _, _) as e ->
log e >>= fun () ->
Lwt.fail exn
| e ->
log e >>= fun () ->
Lwt.fail e
in
let safe_unlink fn =
Lwt.catch
(fun () -> File_system.unlink fn)
handle_exn in
let fn = Printf.sprintf "%s/touch-%d" dir (Unix.getpid ()) in
let check () =
safe_unlink fn >>= fun () ->
let go () =
Logger.debug_f_ "Touching %S" fn >>= fun () ->
Lwt_unix.openfile fn
[Lwt_unix.O_RDWR; Lwt_unix.O_CLOEXEC; Lwt_unix.O_CREAT; Lwt_unix.O_EXCL]
0o600 >>= fun fd ->
Lwt.finalize
(fun () ->
Logger.debug_f_ "Write byte to %S" fn >>= fun () ->
Lwt_unix.write fd "0" 0 1 >>= fun _ ->
if t._fsync_tlog_dir
then
begin
Logger.debug_f_ "Fsync %S" fn >>= fun () ->
Lwt_unix.fsync fd
end
else
Lwt.return ())
(fun () ->
Lwt_unix.close fd)
in
Lwt.catch go handle_exn
in
Lwt.finalize check (fun () -> safe_unlink fn)
in
let verify dir msg exn =
verify_exists dir msg exn >>= fun () ->
verify_writable dir msg exn
in
verify t.home "Home dir" (InvalidHomeDir t.home) >>= fun () ->
verify t.tlog_dir "Tlog dir" (InvalidTlogDir t.tlog_dir) >>= fun () ->
verify t.tlx_dir "Tlx dir" (InvalidTlxDir t.tlx_dir) >>= fun () ->
verify t.head_dir "Head dir" (InvalidHeadDir t.head_dir)
end
end