forked from apache/couchdb
/
couch_db.erl
1353 lines (1206 loc) · 47.9 KB
/
couch_db.erl
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% 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.
-module(couch_db).
-behaviour(gen_server).
-export([open/2,open_int/2,close/1,create/2,get_db_info/1,get_design_docs/1]).
-export([start_compact/1, cancel_compact/1]).
-export([open_ref_counted/2,is_idle/1,monitor/1,count_changes_since/2]).
-export([update_doc/3,update_doc/4,update_docs/4,update_docs/2,update_docs/3,delete_doc/3]).
-export([get_doc_info/2,get_full_doc_info/2,get_full_doc_infos/2]).
-export([open_doc/2,open_doc/3,open_doc_revs/4]).
-export([set_revs_limit/2,get_revs_limit/1]).
-export([get_missing_revs/2,name/1,get_update_seq/1,get_committed_update_seq/1]).
-export([enum_docs/4,enum_docs_since/5]).
-export([enum_docs_since_reduce_to_count/1,enum_docs_reduce_to_count/1]).
-export([increment_update_seq/1,get_purge_seq/1,purge_docs/2,get_last_purged/1]).
-export([start_link/3,open_doc_int/3,ensure_full_commit/1]).
-export([set_security/2,get_security/1]).
-export([init/1,terminate/2,handle_call/3,handle_cast/2,code_change/3,handle_info/2]).
-export([changes_since/4,changes_since/5,read_doc/2,new_revid/1]).
-export([check_is_admin/1, check_is_member/1]).
-export([reopen/1, is_system_db/1, compression/1]).
-include("couch_db.hrl").
start_link(DbName, Filepath, Options) ->
case open_db_file(Filepath, Options) of
{ok, Fd} ->
StartResult = gen_server:start_link(couch_db, {DbName, Filepath, Fd, Options}, []),
unlink(Fd),
StartResult;
Else ->
Else
end.
open_db_file(Filepath, Options) ->
case couch_file:open(Filepath, Options) of
{ok, Fd} ->
{ok, Fd};
{error, enoent} ->
% couldn't find file. is there a compact version? This can happen if
% crashed during the file switch.
case couch_file:open(Filepath ++ ".compact", [nologifmissing]) of
{ok, Fd} ->
?LOG_INFO("Found ~s~s compaction file, using as primary storage.", [Filepath, ".compact"]),
ok = file:rename(Filepath ++ ".compact", Filepath),
ok = couch_file:sync(Fd),
{ok, Fd};
{error, enoent} ->
{not_found, no_db_file}
end;
Error ->
Error
end.
create(DbName, Options) ->
couch_server:create(DbName, Options).
% this is for opening a database for internal purposes like the replicator
% or the view indexer. it never throws a reader error.
open_int(DbName, Options) ->
couch_server:open(DbName, Options).
% this should be called anytime an http request opens the database.
% it ensures that the http userCtx is a valid reader
open(DbName, Options) ->
case couch_server:open(DbName, Options) of
{ok, Db} ->
try
check_is_member(Db),
{ok, Db}
catch
throw:Error ->
close(Db),
throw(Error)
end;
Else -> Else
end.
reopen(#db{main_pid = Pid, fd_ref_counter = OldRefCntr, user_ctx = UserCtx}) ->
{ok, #db{fd_ref_counter = NewRefCntr} = NewDb} =
gen_server:call(Pid, get_db, infinity),
case NewRefCntr =:= OldRefCntr of
true ->
ok;
false ->
couch_ref_counter:add(NewRefCntr),
catch couch_ref_counter:drop(OldRefCntr)
end,
{ok, NewDb#db{user_ctx = UserCtx}}.
is_system_db(#db{options = Options}) ->
lists:member(sys_db, Options).
ensure_full_commit(#db{update_pid=UpdatePid,instance_start_time=StartTime}) ->
ok = gen_server:call(UpdatePid, full_commit, infinity),
{ok, StartTime}.
close(#db{fd_ref_counter=RefCntr}) ->
couch_ref_counter:drop(RefCntr).
open_ref_counted(MainPid, OpenedPid) ->
gen_server:call(MainPid, {open_ref_count, OpenedPid}).
is_idle(#db{main_pid = MainPid}) ->
is_idle(MainPid);
is_idle(MainPid) ->
gen_server:call(MainPid, is_idle).
monitor(#db{main_pid=MainPid}) ->
erlang:monitor(process, MainPid).
start_compact(#db{update_pid=Pid}) ->
gen_server:call(Pid, start_compact).
cancel_compact(#db{update_pid=Pid}) ->
gen_server:call(Pid, cancel_compact).
delete_doc(Db, Id, Revisions) ->
DeletedDocs = [#doc{id=Id, revs=[Rev], deleted=true} || Rev <- Revisions],
{ok, [Result]} = update_docs(Db, DeletedDocs, []),
{ok, Result}.
open_doc(Db, IdOrDocInfo) ->
open_doc(Db, IdOrDocInfo, []).
open_doc(Db, Id, Options) ->
increment_stat(Db, {couchdb, database_reads}),
case open_doc_int(Db, Id, Options) of
{ok, #doc{deleted=true}=Doc} ->
case lists:member(deleted, Options) of
true ->
apply_open_options({ok, Doc},Options);
false ->
{not_found, deleted}
end;
Else ->
apply_open_options(Else,Options)
end.
apply_open_options({ok, Doc},Options) ->
apply_open_options2(Doc,Options);
apply_open_options(Else,_Options) ->
Else.
apply_open_options2(Doc,[]) ->
{ok, Doc};
apply_open_options2(#doc{atts=Atts,revs=Revs}=Doc,
[{atts_since, PossibleAncestors}|Rest]) ->
RevPos = find_ancestor_rev_pos(Revs, PossibleAncestors),
apply_open_options2(Doc#doc{atts=[A#att{data=
if AttPos>RevPos -> Data; true -> stub end}
|| #att{revpos=AttPos,data=Data}=A <- Atts]}, Rest);
apply_open_options2(Doc, [ejson_body | Rest]) ->
apply_open_options2(couch_doc:with_ejson_body(Doc), Rest);
apply_open_options2(Doc,[_|Rest]) ->
apply_open_options2(Doc,Rest).
find_ancestor_rev_pos({_, []}, _AttsSinceRevs) ->
0;
find_ancestor_rev_pos(_DocRevs, []) ->
0;
find_ancestor_rev_pos({RevPos, [RevId|Rest]}, AttsSinceRevs) ->
case lists:member({RevPos, RevId}, AttsSinceRevs) of
true ->
RevPos;
false ->
find_ancestor_rev_pos({RevPos - 1, Rest}, AttsSinceRevs)
end.
open_doc_revs(Db, Id, Revs, Options) ->
increment_stat(Db, {couchdb, database_reads}),
[{ok, Results}] = open_doc_revs_int(Db, [{Id, Revs}], Options),
{ok, [apply_open_options(Result, Options) || Result <- Results]}.
% Each returned result is a list of tuples:
% {Id, MissingRevs, PossibleAncestors}
% if no revs are missing, it's omitted from the results.
get_missing_revs(Db, IdRevsList) ->
Results = get_full_doc_infos(Db, [Id1 || {Id1, _Revs} <- IdRevsList]),
{ok, find_missing(IdRevsList, Results)}.
find_missing([], []) ->
[];
find_missing([{Id, Revs}|RestIdRevs], [{ok, FullInfo} | RestLookupInfo]) ->
case couch_key_tree:find_missing(FullInfo#full_doc_info.rev_tree, Revs) of
[] ->
find_missing(RestIdRevs, RestLookupInfo);
MissingRevs ->
#doc_info{revs=RevsInfo} = couch_doc:to_doc_info(FullInfo),
LeafRevs = [Rev || #rev_info{rev=Rev} <- RevsInfo],
% Find the revs that are possible parents of this rev
PossibleAncestors =
lists:foldl(fun({LeafPos, LeafRevId}, Acc) ->
% this leaf is a "possible ancenstor" of the missing
% revs if this LeafPos lessthan any of the missing revs
case lists:any(fun({MissingPos, _}) ->
LeafPos < MissingPos end, MissingRevs) of
true ->
[{LeafPos, LeafRevId} | Acc];
false ->
Acc
end
end, [], LeafRevs),
[{Id, MissingRevs, PossibleAncestors} |
find_missing(RestIdRevs, RestLookupInfo)]
end;
find_missing([{Id, Revs}|RestIdRevs], [not_found | RestLookupInfo]) ->
[{Id, Revs, []} | find_missing(RestIdRevs, RestLookupInfo)].
get_doc_info(Db, Id) ->
case get_full_doc_info(Db, Id) of
{ok, DocInfo} ->
{ok, couch_doc:to_doc_info(DocInfo)};
Else ->
Else
end.
% returns {ok, DocInfo} or not_found
get_full_doc_info(Db, Id) ->
[Result] = get_full_doc_infos(Db, [Id]),
Result.
get_full_doc_infos(Db, Ids) ->
couch_btree:lookup(by_id_btree(Db), Ids).
increment_update_seq(#db{update_pid=UpdatePid}) ->
gen_server:call(UpdatePid, increment_update_seq).
purge_docs(#db{update_pid=UpdatePid}, IdsRevs) ->
gen_server:call(UpdatePid, {purge_docs, IdsRevs}).
get_committed_update_seq(#db{committed_update_seq=Seq}) ->
Seq.
get_update_seq(#db{update_seq=Seq})->
Seq.
get_purge_seq(#db{header=#db_header{purge_seq=PurgeSeq}})->
PurgeSeq.
get_last_purged(#db{header=#db_header{purged_docs=nil}}) ->
{ok, []};
get_last_purged(#db{fd=Fd, header=#db_header{purged_docs=PurgedPointer}}) ->
couch_file:pread_term(Fd, PurgedPointer).
get_db_info(Db) ->
#db{fd=Fd,
header=#db_header{disk_version=DiskVersion},
compactor_pid=Compactor,
update_seq=SeqNum,
name=Name,
instance_start_time=StartTime,
committed_update_seq=CommittedUpdateSeq,
fulldocinfo_by_id_btree = IdBtree,
docinfo_by_seq_btree = SeqBtree,
local_docs_btree = LocalBtree
} = Db,
{ok, Size} = couch_file:bytes(Fd),
{ok, DbReduction} = couch_btree:full_reduce(by_id_btree(Db)),
InfoList = [
{db_name, Name},
{doc_count, element(1, DbReduction)},
{doc_del_count, element(2, DbReduction)},
{update_seq, SeqNum},
{purge_seq, couch_db:get_purge_seq(Db)},
{compact_running, Compactor/=nil},
{disk_size, Size},
{data_size, db_data_size(DbReduction, [SeqBtree, IdBtree, LocalBtree])},
{instance_start_time, StartTime},
{disk_format_version, DiskVersion},
{committed_update_seq, CommittedUpdateSeq}
],
{ok, InfoList}.
db_data_size({_Count, _DelCount}, _Trees) ->
% pre 1.2 format, upgraded on compaction
null;
db_data_size({_Count, _DelCount, nil}, _Trees) ->
null;
db_data_size({_Count, _DelCount, DocAndAttsSize}, Trees) ->
sum_tree_sizes(DocAndAttsSize, Trees).
sum_tree_sizes(Acc, []) ->
Acc;
sum_tree_sizes(Acc, [T | Rest]) ->
case couch_btree:size(T) of
nil ->
null;
Sz ->
sum_tree_sizes(Acc + Sz, Rest)
end.
get_design_docs(Db) ->
FoldFun = skip_deleted(fun
(#full_doc_info{deleted = true}, _Reds, Acc) ->
{ok, Acc};
(#full_doc_info{id= <<"_design/",_/binary>>}=FullDocInfo, _Reds, Acc) ->
{ok, [FullDocInfo | Acc]};
(_, _Reds, Acc) ->
{stop, Acc}
end),
KeyOpts = [{start_key, <<"_design/">>}, {end_key_gt, <<"_design0">>}],
{ok, _, Docs} = couch_btree:fold(by_id_btree(Db), FoldFun, [], KeyOpts),
Docs.
check_is_admin(#db{user_ctx=#user_ctx{name=Name,roles=Roles}}=Db) ->
{Admins} = get_admins(Db),
AdminRoles = [<<"_admin">> | couch_util:get_value(<<"roles">>, Admins, [])],
AdminNames = couch_util:get_value(<<"names">>, Admins,[]),
case AdminRoles -- Roles of
AdminRoles -> % same list, not an admin role
case AdminNames -- [Name] of
AdminNames -> % same names, not an admin
throw({unauthorized, <<"You are not a db or server admin.">>});
_ ->
ok
end;
_ ->
ok
end.
check_is_member(#db{user_ctx=#user_ctx{name=Name,roles=Roles}=UserCtx}=Db) ->
case (catch check_is_admin(Db)) of
ok -> ok;
_ ->
{Members} = get_members(Db),
ReaderRoles = couch_util:get_value(<<"roles">>, Members,[]),
WithAdminRoles = [<<"_admin">> | ReaderRoles],
ReaderNames = couch_util:get_value(<<"names">>, Members,[]),
case ReaderRoles ++ ReaderNames of
[] -> ok; % no readers == public access
_Else ->
case WithAdminRoles -- Roles of
WithAdminRoles -> % same list, not an reader role
case ReaderNames -- [Name] of
ReaderNames -> % same names, not a reader
?LOG_DEBUG("Not a reader: UserCtx ~p vs Names ~p Roles ~p",[UserCtx, ReaderNames, WithAdminRoles]),
throw({unauthorized, <<"You are not authorized to access this db.">>});
_ ->
ok
end;
_ ->
ok
end
end
end.
get_admins(#db{security=SecProps}) ->
couch_util:get_value(<<"admins">>, SecProps, {[]}).
get_members(#db{security=SecProps}) ->
% we fallback to readers here for backwards compatibility
couch_util:get_value(<<"members">>, SecProps,
couch_util:get_value(<<"readers">>, SecProps, {[]})).
get_security(#db{security=SecProps}) ->
{SecProps}.
set_security(#db{update_pid=Pid}=Db, {NewSecProps}) when is_list(NewSecProps) ->
check_is_admin(Db),
ok = validate_security_object(NewSecProps),
ok = gen_server:call(Pid, {set_security, NewSecProps}, infinity),
{ok, _} = ensure_full_commit(Db),
ok;
set_security(_, _) ->
throw(bad_request).
validate_security_object(SecProps) ->
Admins = couch_util:get_value(<<"admins">>, SecProps, {[]}),
% we fallback to readers here for backwards compatibility
Members = couch_util:get_value(<<"members">>, SecProps,
couch_util:get_value(<<"readers">>, SecProps, {[]})),
ok = validate_names_and_roles(Admins),
ok = validate_names_and_roles(Members),
ok.
% validate user input
validate_names_and_roles({Props}) when is_list(Props) ->
case couch_util:get_value(<<"names">>,Props,[]) of
Ns when is_list(Ns) ->
[throw("names must be a JSON list of strings") ||N <- Ns, not is_binary(N)],
Ns;
_ -> throw("names must be a JSON list of strings")
end,
case couch_util:get_value(<<"roles">>,Props,[]) of
Rs when is_list(Rs) ->
[throw("roles must be a JSON list of strings") ||R <- Rs, not is_binary(R)],
Rs;
_ -> throw("roles must be a JSON list of strings")
end,
ok.
get_revs_limit(#db{revs_limit=Limit}) ->
Limit.
set_revs_limit(#db{update_pid=Pid}=Db, Limit) when Limit > 0 ->
check_is_admin(Db),
gen_server:call(Pid, {set_revs_limit, Limit}, infinity);
set_revs_limit(_Db, _Limit) ->
throw(invalid_revs_limit).
name(#db{name=Name}) ->
Name.
compression(#db{compression=Compression}) ->
Compression.
update_doc(Db, Doc, Options) ->
update_doc(Db, Doc, Options, interactive_edit).
update_doc(Db, Doc, Options, UpdateType) ->
case update_docs(Db, [Doc], Options, UpdateType) of
{ok, [{ok, NewRev}]} ->
{ok, NewRev};
{ok, [{{_Id, _Rev}, Error}]} ->
throw(Error);
{ok, [Error]} ->
throw(Error);
{ok, []} ->
% replication success
{Pos, [RevId | _]} = Doc#doc.revs,
{ok, {Pos, RevId}}
end.
update_docs(Db, Docs) ->
update_docs(Db, Docs, []).
% group_alike_docs groups the sorted documents into sublist buckets, by id.
% ([DocA, DocA, DocB, DocC], []) -> [[DocA, DocA], [DocB], [DocC]]
group_alike_docs(Docs) ->
Sorted = lists:sort(fun({#doc{id=A},_},{#doc{id=B},_})-> A < B end, Docs),
group_alike_docs(Sorted, []).
group_alike_docs([], Buckets) ->
lists:reverse(lists:map(fun lists:reverse/1, Buckets));
group_alike_docs([Doc|Rest], []) ->
group_alike_docs(Rest, [[Doc]]);
group_alike_docs([{Doc,Ref}|Rest], [Bucket|RestBuckets]) ->
[{#doc{id=BucketId},_Ref}|_] = Bucket,
case Doc#doc.id == BucketId of
true ->
% add to existing bucket
group_alike_docs(Rest, [[{Doc,Ref}|Bucket]|RestBuckets]);
false ->
% add to new bucket
group_alike_docs(Rest, [[{Doc,Ref}]|[Bucket|RestBuckets]])
end.
validate_doc_update(#db{}=Db, #doc{id= <<"_design/",_/binary>>}, _GetDiskDocFun) ->
catch check_is_admin(Db);
validate_doc_update(#db{validate_doc_funs=[]}, _Doc, _GetDiskDocFun) ->
ok;
validate_doc_update(_Db, #doc{id= <<"_local/",_/binary>>}, _GetDiskDocFun) ->
ok;
validate_doc_update(Db, Doc, GetDiskDocFun) ->
DiskDoc = GetDiskDocFun(),
JsonCtx = couch_util:json_user_ctx(Db),
SecObj = get_security(Db),
try [case Fun(Doc, DiskDoc, JsonCtx, SecObj) of
ok -> ok;
Error -> throw(Error)
end || Fun <- Db#db.validate_doc_funs],
ok
catch
throw:Error ->
Error
end.
prep_and_validate_update(Db, #doc{id=Id,revs={RevStart, Revs}}=Doc,
OldFullDocInfo, LeafRevsDict, AllowConflict) ->
case Revs of
[PrevRev|_] ->
case dict:find({RevStart, PrevRev}, LeafRevsDict) of
{ok, {Deleted, DiskSp, DiskRevs}} ->
case couch_doc:has_stubs(Doc) of
true ->
DiskDoc = make_doc(Db, Id, Deleted, DiskSp, DiskRevs),
Doc2 = couch_doc:merge_stubs(Doc, DiskDoc),
{validate_doc_update(Db, Doc2, fun() -> DiskDoc end), Doc2};
false ->
LoadDiskDoc = fun() -> make_doc(Db,Id,Deleted,DiskSp,DiskRevs) end,
{validate_doc_update(Db, Doc, LoadDiskDoc), Doc}
end;
error when AllowConflict ->
couch_doc:merge_stubs(Doc, #doc{}), % will generate error if
% there are stubs
{validate_doc_update(Db, Doc, fun() -> nil end), Doc};
error ->
{conflict, Doc}
end;
[] ->
% new doc, and we have existing revs.
% reuse existing deleted doc
if OldFullDocInfo#full_doc_info.deleted orelse AllowConflict ->
{validate_doc_update(Db, Doc, fun() -> nil end), Doc};
true ->
{conflict, Doc}
end
end.
prep_and_validate_updates(_Db, [], [], _AllowConflict, AccPrepped,
AccFatalErrors) ->
{AccPrepped, AccFatalErrors};
prep_and_validate_updates(Db, [DocBucket|RestBuckets], [not_found|RestLookups],
AllowConflict, AccPrepped, AccErrors) ->
{PreppedBucket, AccErrors3} = lists:foldl(
fun({#doc{revs=Revs}=Doc,Ref}, {AccBucket, AccErrors2}) ->
case couch_doc:has_stubs(Doc) of
true ->
couch_doc:merge_stubs(Doc, #doc{}); % will throw exception
false -> ok
end,
case Revs of
{0, []} ->
case validate_doc_update(Db, Doc, fun() -> nil end) of
ok ->
{[{Doc, Ref} | AccBucket], AccErrors2};
Error ->
{AccBucket, [{Ref, Error} | AccErrors2]}
end;
_ ->
% old revs specified but none exist, a conflict
{AccBucket, [{Ref, conflict} | AccErrors2]}
end
end,
{[], AccErrors}, DocBucket),
prep_and_validate_updates(Db, RestBuckets, RestLookups, AllowConflict,
[lists:reverse(PreppedBucket) | AccPrepped], AccErrors3);
prep_and_validate_updates(Db, [DocBucket|RestBuckets],
[{ok, #full_doc_info{rev_tree=OldRevTree}=OldFullDocInfo}|RestLookups],
AllowConflict, AccPrepped, AccErrors) ->
Leafs = couch_key_tree:get_all_leafs(OldRevTree),
LeafRevsDict = dict:from_list([
begin
Deleted = element(1, LeafVal),
Sp = element(2, LeafVal),
{{Start, RevId}, {Deleted, Sp, Revs}}
end ||
{LeafVal, {Start, [RevId | _]} = Revs} <- Leafs
]),
{PreppedBucket, AccErrors3} = lists:foldl(
fun({Doc, Ref}, {Docs2Acc, AccErrors2}) ->
case prep_and_validate_update(Db, Doc, OldFullDocInfo,
LeafRevsDict, AllowConflict) of
{ok, Doc2} ->
{[{Doc2, Ref} | Docs2Acc], AccErrors2};
{Error, #doc{}} ->
% Record the error
{Docs2Acc, [{Ref, Error} |AccErrors2]}
end
end,
{[], AccErrors}, DocBucket),
prep_and_validate_updates(Db, RestBuckets, RestLookups, AllowConflict,
[PreppedBucket | AccPrepped], AccErrors3).
update_docs(Db, Docs, Options) ->
update_docs(Db, Docs, Options, interactive_edit).
prep_and_validate_replicated_updates(_Db, [], [], AccPrepped, AccErrors) ->
Errors2 = [{{Id, {Pos, Rev}}, Error} ||
{#doc{id=Id,revs={Pos,[Rev|_]}}, Error} <- AccErrors],
{lists:reverse(AccPrepped), lists:reverse(Errors2)};
prep_and_validate_replicated_updates(Db, [Bucket|RestBuckets], [OldInfo|RestOldInfo], AccPrepped, AccErrors) ->
case OldInfo of
not_found ->
{ValidatedBucket, AccErrors3} = lists:foldl(
fun({Doc, Ref}, {AccPrepped2, AccErrors2}) ->
case couch_doc:has_stubs(Doc) of
true ->
couch_doc:merge_stubs(Doc, #doc{}); % will throw exception
false -> ok
end,
case validate_doc_update(Db, Doc, fun() -> nil end) of
ok ->
{[{Doc, Ref} | AccPrepped2], AccErrors2};
Error ->
{AccPrepped2, [{Doc, Error} | AccErrors2]}
end
end,
{[], AccErrors}, Bucket),
prep_and_validate_replicated_updates(Db, RestBuckets, RestOldInfo, [ValidatedBucket | AccPrepped], AccErrors3);
{ok, #full_doc_info{rev_tree=OldTree}} ->
NewRevTree = lists:foldl(
fun({NewDoc, _Ref}, AccTree) ->
{NewTree, _} = couch_key_tree:merge(AccTree,
couch_doc:to_path(NewDoc), Db#db.revs_limit),
NewTree
end,
OldTree, Bucket),
Leafs = couch_key_tree:get_all_leafs_full(NewRevTree),
LeafRevsFullDict = dict:from_list( [{{Start, RevId}, FullPath} || {Start, [{RevId, _}|_]}=FullPath <- Leafs]),
{ValidatedBucket, AccErrors3} =
lists:foldl(
fun({#doc{id=Id,revs={Pos, [RevId|_]}}=Doc, Ref}, {AccValidated, AccErrors2}) ->
case dict:find({Pos, RevId}, LeafRevsFullDict) of
{ok, {Start, Path}} ->
% our unflushed doc is a leaf node. Go back on the path
% to find the previous rev that's on disk.
LoadPrevRevFun = fun() ->
make_first_doc_on_disk(Db,Id,Start-1, tl(Path))
end,
case couch_doc:has_stubs(Doc) of
true ->
DiskDoc = LoadPrevRevFun(),
Doc2 = couch_doc:merge_stubs(Doc, DiskDoc),
GetDiskDocFun = fun() -> DiskDoc end;
false ->
Doc2 = Doc,
GetDiskDocFun = LoadPrevRevFun
end,
case validate_doc_update(Db, Doc2, GetDiskDocFun) of
ok ->
{[{Doc2, Ref} | AccValidated], AccErrors2};
Error ->
{AccValidated, [{Doc, Error} | AccErrors2]}
end;
_ ->
% this doc isn't a leaf or already exists in the tree.
% ignore but consider it a success.
{AccValidated, AccErrors2}
end
end,
{[], AccErrors}, Bucket),
prep_and_validate_replicated_updates(Db, RestBuckets, RestOldInfo,
[ValidatedBucket | AccPrepped], AccErrors3)
end.
new_revid(#doc{body=Body,revs={OldStart,OldRevs},
atts=Atts,deleted=Deleted}) ->
case [{N, T, M} || #att{name=N,type=T,md5=M} <- Atts, M =/= <<>>] of
Atts2 when length(Atts) =/= length(Atts2) ->
% We must have old style non-md5 attachments
?l2b(integer_to_list(couch_util:rand32()));
Atts2 ->
OldRev = case OldRevs of [] -> 0; [OldRev0|_] -> OldRev0 end,
couch_util:md5(term_to_binary([Deleted, OldStart, OldRev, Body, Atts2]))
end.
new_revs([], OutBuckets, IdRevsAcc) ->
{lists:reverse(OutBuckets), IdRevsAcc};
new_revs([Bucket|RestBuckets], OutBuckets, IdRevsAcc) ->
{NewBucket, IdRevsAcc3} = lists:mapfoldl(
fun({#doc{revs={Start, RevIds}}=Doc, Ref}, IdRevsAcc2)->
NewRevId = new_revid(Doc),
{{Doc#doc{revs={Start+1, [NewRevId | RevIds]}}, Ref},
[{Ref, {ok, {Start+1, NewRevId}}} | IdRevsAcc2]}
end, IdRevsAcc, Bucket),
new_revs(RestBuckets, [NewBucket|OutBuckets], IdRevsAcc3).
check_dup_atts(#doc{atts=Atts}=Doc) ->
Atts2 = lists:sort(fun(#att{name=N1}, #att{name=N2}) -> N1 < N2 end, Atts),
check_dup_atts2(Atts2),
Doc.
check_dup_atts2([#att{name=N}, #att{name=N} | _]) ->
throw({bad_request, <<"Duplicate attachments">>});
check_dup_atts2([_ | Rest]) ->
check_dup_atts2(Rest);
check_dup_atts2(_) ->
ok.
update_docs(Db, Docs, Options, replicated_changes) ->
increment_stat(Db, {couchdb, database_writes}),
% associate reference with each doc in order to track duplicates
Docs2 = lists:map(fun(Doc) -> {Doc, make_ref()} end, Docs),
DocBuckets = before_docs_update(Db, group_alike_docs(Docs2)),
case (Db#db.validate_doc_funs /= []) orelse
lists:any(
fun({#doc{id= <<?DESIGN_DOC_PREFIX, _/binary>>}, _Ref}) -> true;
({#doc{atts=Atts}, _Ref}) ->
Atts /= []
end, Docs2) of
true ->
Ids = [Id || [{#doc{id=Id}, _Ref}|_] <- DocBuckets],
ExistingDocs = get_full_doc_infos(Db, Ids),
{DocBuckets2, DocErrors} =
prep_and_validate_replicated_updates(Db, DocBuckets, ExistingDocs, [], []),
DocBuckets3 = [Bucket || [_|_]=Bucket <- DocBuckets2]; % remove empty buckets
false ->
DocErrors = [],
DocBuckets3 = DocBuckets
end,
DocBuckets4 = [[{doc_flush_atts(check_dup_atts(Doc), Db#db.updater_fd), Ref}
|| {Doc, Ref} <- Bucket] || Bucket <- DocBuckets3],
{ok, []} = write_and_commit(Db, DocBuckets4, [], [merge_conflicts | Options]),
{ok, DocErrors};
update_docs(Db, Docs, Options, interactive_edit) ->
increment_stat(Db, {couchdb, database_writes}),
AllOrNothing = lists:member(all_or_nothing, Options),
% go ahead and generate the new revision ids for the documents.
% separate out the NonRep documents from the rest of the documents
% associate reference with each doc in order to track duplicates
Docs2 = lists:map(fun(Doc) -> {Doc, make_ref()} end,Docs),
{Docs3, NonRepDocs} = lists:foldl(
fun({#doc{id=Id},_Ref}=Doc, {DocsAcc, NonRepDocsAcc}) ->
case Id of
<<?LOCAL_DOC_PREFIX, _/binary>> ->
{DocsAcc, [Doc | NonRepDocsAcc]};
Id->
{[Doc | DocsAcc], NonRepDocsAcc}
end
end, {[], []}, Docs2),
DocBuckets = before_docs_update(Db, group_alike_docs(Docs3)),
case (Db#db.validate_doc_funs /= []) orelse
lists:any(
fun({#doc{id= <<?DESIGN_DOC_PREFIX, _/binary>>}, _Ref}) ->
true;
({#doc{atts=Atts}, _Ref}) ->
Atts /= []
end, Docs3) of
true ->
% lookup the doc by id and get the most recent
Ids = [Id || [{#doc{id=Id}, _Ref}|_] <- DocBuckets],
ExistingDocInfos = get_full_doc_infos(Db, Ids),
{DocBucketsPrepped, PreCommitFailures} = prep_and_validate_updates(Db,
DocBuckets, ExistingDocInfos, AllOrNothing, [], []),
% strip out any empty buckets
DocBuckets2 = [Bucket || [_|_] = Bucket <- DocBucketsPrepped];
false ->
PreCommitFailures = [],
DocBuckets2 = DocBuckets
end,
if (AllOrNothing) and (PreCommitFailures /= []) ->
{aborted,
lists:foldl(fun({#doc{id=Id,revs={Pos, RevIds}}, Ref},Acc) ->
case lists:keyfind(Ref,1,PreCommitFailures) of
{Ref, Error} ->
[{{Id,{Pos,RevIds}}, Error} | Acc];
false ->
Acc
end
end,[],Docs3)};
true ->
Options2 = if AllOrNothing -> [merge_conflicts];
true -> [] end ++ Options,
DocBuckets3 = [[
{doc_flush_atts(set_new_att_revpos(
check_dup_atts(Doc)), Db#db.updater_fd), Ref}
|| {Doc, Ref} <- B] || B <- DocBuckets2],
{DocBuckets4, IdRevs} = new_revs(DocBuckets3, [], []),
{ok, CommitResults} = write_and_commit(Db, DocBuckets4, NonRepDocs, Options2),
ResultsDict = dict:from_list(IdRevs ++ CommitResults ++ PreCommitFailures),
{ok, lists:map(
fun({#doc{}, Ref}) ->
{ok, Result} = dict:find(Ref, ResultsDict),
Result
end, Docs2)}
end.
% Returns the first available document on disk. Input list is a full rev path
% for the doc.
make_first_doc_on_disk(_Db, _Id, _Pos, []) ->
nil;
make_first_doc_on_disk(Db, Id, Pos, [{_Rev, #doc{}} | RestPath]) ->
make_first_doc_on_disk(Db, Id, Pos-1, RestPath);
make_first_doc_on_disk(Db, Id, Pos, [{_Rev, ?REV_MISSING}|RestPath]) ->
make_first_doc_on_disk(Db, Id, Pos - 1, RestPath);
make_first_doc_on_disk(Db, Id, Pos, [{_Rev, RevValue} |_]=DocPath) ->
IsDel = element(1, RevValue),
Sp = element(2, RevValue),
Revs = [Rev || {Rev, _} <- DocPath],
make_doc(Db, Id, IsDel, Sp, {Pos, Revs}).
set_commit_option(Options) ->
CommitSettings = {
[true || O <- Options, O==full_commit orelse O==delay_commit],
couch_config:get("couchdb", "delayed_commits", "false")
},
case CommitSettings of
{[true], _} ->
Options; % user requested explicit commit setting, do not change it
{_, "true"} ->
Options; % delayed commits are enabled, do nothing
{_, "false"} ->
[full_commit|Options];
{_, Else} ->
?LOG_ERROR("[couchdb] delayed_commits setting must be true/false, not ~p",
[Else]),
[full_commit|Options]
end.
collect_results(UpdatePid, MRef, ResultsAcc) ->
receive
{result, UpdatePid, Result} ->
collect_results(UpdatePid, MRef, [Result | ResultsAcc]);
{done, UpdatePid} ->
{ok, ResultsAcc};
{retry, UpdatePid} ->
retry;
{'DOWN', MRef, _, _, Reason} ->
exit(Reason)
end.
write_and_commit(#db{update_pid=UpdatePid}=Db, DocBuckets1,
NonRepDocs, Options0) ->
DocBuckets = prepare_doc_summaries(Db, DocBuckets1),
Options = set_commit_option(Options0),
MergeConflicts = lists:member(merge_conflicts, Options),
FullCommit = lists:member(full_commit, Options),
MRef = erlang:monitor(process, UpdatePid),
try
UpdatePid ! {update_docs, self(), DocBuckets, NonRepDocs, MergeConflicts, FullCommit},
case collect_results(UpdatePid, MRef, []) of
{ok, Results} -> {ok, Results};
retry ->
% This can happen if the db file we wrote to was swapped out by
% compaction. Retry by reopening the db and writing to the current file
{ok, Db2} = open_ref_counted(Db#db.main_pid, self()),
DocBuckets2 = [
[{doc_flush_atts(Doc, Db2#db.updater_fd), Ref} || {Doc, Ref} <- Bucket] ||
Bucket <- DocBuckets1
],
% We only retry once
DocBuckets3 = prepare_doc_summaries(Db2, DocBuckets2),
close(Db2),
UpdatePid ! {update_docs, self(), DocBuckets3, NonRepDocs, MergeConflicts, FullCommit},
case collect_results(UpdatePid, MRef, []) of
{ok, Results} -> {ok, Results};
retry -> throw({update_error, compaction_retry})
end
end
after
erlang:demonitor(MRef, [flush])
end.
prepare_doc_summaries(Db, BucketList) ->
[lists:map(
fun({#doc{body = Body, atts = Atts} = Doc, Ref}) ->
DiskAtts = [{N, T, P, AL, DL, R, M, E} ||
#att{name = N, type = T, data = {_, P}, md5 = M, revpos = R,
att_len = AL, disk_len = DL, encoding = E} <- Atts],
AttsFd = case Atts of
[#att{data = {Fd, _}} | _] ->
Fd;
[] ->
nil
end,
SummaryChunk = couch_db_updater:make_doc_summary(Db, {Body, DiskAtts}),
{Doc#doc{body = {summary, SummaryChunk, AttsFd}}, Ref}
end,
Bucket) || Bucket <- BucketList].
before_docs_update(#db{before_doc_update = nil}, BucketList) ->
BucketList;
before_docs_update(#db{before_doc_update = Fun} = Db, BucketList) ->
[lists:map(
fun({Doc, Ref}) ->
NewDoc = Fun(couch_doc:with_ejson_body(Doc), Db),
{NewDoc, Ref}
end,
Bucket) || Bucket <- BucketList].
set_new_att_revpos(#doc{revs={RevPos,_Revs},atts=Atts}=Doc) ->
Doc#doc{atts= lists:map(fun(#att{data={_Fd,_Sp}}=Att) ->
% already commited to disk, do not set new rev
Att;
(Att) ->
Att#att{revpos=RevPos+1}
end, Atts)}.
doc_flush_atts(Doc, Fd) ->
Doc#doc{atts=[flush_att(Fd, Att) || Att <- Doc#doc.atts]}.
check_md5(_NewSig, <<>>) -> ok;
check_md5(Sig, Sig) -> ok;
check_md5(_, _) -> throw(md5_mismatch).
flush_att(Fd, #att{data={Fd0, _}}=Att) when Fd0 == Fd ->
% already written to our file, nothing to write
Att;
flush_att(Fd, #att{data={OtherFd,StreamPointer}, md5=InMd5,
disk_len=InDiskLen} = Att) ->
{NewStreamData, Len, _IdentityLen, Md5, IdentityMd5} =
couch_stream:copy_to_new_stream(OtherFd, StreamPointer, Fd),
check_md5(IdentityMd5, InMd5),
Att#att{data={Fd, NewStreamData}, md5=Md5, att_len=Len, disk_len=InDiskLen};
flush_att(Fd, #att{data=Data}=Att) when is_binary(Data) ->
with_stream(Fd, Att, fun(OutputStream) ->
couch_stream:write(OutputStream, Data)
end);
flush_att(Fd, #att{data=Fun,att_len=undefined}=Att) when is_function(Fun) ->
MaxChunkSize = list_to_integer(
couch_config:get("couchdb", "attachment_stream_buffer_size", "4096")),
with_stream(Fd, Att, fun(OutputStream) ->
% Fun(MaxChunkSize, WriterFun) must call WriterFun
% once for each chunk of the attachment,
Fun(MaxChunkSize,
% WriterFun({Length, Binary}, State)
% WriterFun({0, _Footers}, State)
% Called with Length == 0 on the last time.
% WriterFun returns NewState.
fun({0, Footers}, _) ->
F = mochiweb_headers:from_binary(Footers),
case mochiweb_headers:get_value("Content-MD5", F) of
undefined ->
ok;
Md5 ->
{md5, base64:decode(Md5)}
end;
({_Length, Chunk}, _) ->
couch_stream:write(OutputStream, Chunk)
end, ok)
end);
flush_att(Fd, #att{data=Fun,att_len=AttLen}=Att) when is_function(Fun) ->
with_stream(Fd, Att, fun(OutputStream) ->
write_streamed_attachment(OutputStream, Fun, AttLen)
end).
compressible_att_type(MimeType) when is_binary(MimeType) ->
compressible_att_type(?b2l(MimeType));
compressible_att_type(MimeType) ->
TypeExpList = re:split(
couch_config:get("attachments", "compressible_types", ""),
"\\s*,\\s*",
[{return, list}]
),
lists:any(
fun(TypeExp) ->
Regexp = ["^\\s*", re:replace(TypeExp, "\\*", ".*"),
"(?:\\s*;.*?)?\\s*", $$],
re:run(MimeType, Regexp, [caseless]) =/= nomatch
end,
[T || T <- TypeExpList, T /= []]
).
% From RFC 2616 3.6.1 - Chunked Transfer Coding
%
% In other words, the origin server is willing to accept
% the possibility that the trailer fields might be silently
% discarded along the path to the client.
%
% I take this to mean that if "Trailers: Content-MD5\r\n"
% is present in the request, but there is no Content-MD5
% trailer, we're free to ignore this inconsistency and
% pretend that no Content-MD5 exists.
with_stream(Fd, #att{md5=InMd5,type=Type,encoding=Enc}=Att, Fun) ->
BufferSize = list_to_integer(
couch_config:get("couchdb", "attachment_stream_buffer_size", "4096")),
{ok, OutputStream} = case (Enc =:= identity) andalso
compressible_att_type(Type) of
true ->
CompLevel = list_to_integer(
couch_config:get("attachments", "compression_level", "0")
),
couch_stream:open(Fd, [{buffer_size, BufferSize},
{encoding, gzip}, {compression_level, CompLevel}]);
_ ->
couch_stream:open(Fd, [{buffer_size, BufferSize}])
end,
ReqMd5 = case Fun(OutputStream) of
{md5, FooterMd5} ->
case InMd5 of
md5_in_footer -> FooterMd5;
_ -> InMd5