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| 1 | +% Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 2 | +% use this file except in compliance with the License. You may obtain a copy of |
| 3 | +% the License at |
| 4 | +% |
| 5 | +% http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | +% |
| 7 | +% Unless required by applicable law or agreed to in writing, software |
| 8 | +% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 9 | +% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 10 | +% License for the specific language governing permissions and limitations under |
| 11 | +% the License. |
| 12 | + |
| 13 | +-module(mango_simple_proc). |
| 14 | +-behavior(gen_server). |
| 15 | + |
| 16 | +-export([ |
| 17 | + start_link/0, |
| 18 | + set_timeout/2, |
| 19 | + prompt/2 |
| 20 | +]). |
| 21 | + |
| 22 | +-export([ |
| 23 | + init/1, |
| 24 | + handle_call/3, |
| 25 | + handle_cast/2 |
| 26 | +]). |
| 27 | + |
| 28 | +% DDoc Fields |
| 29 | +-define(SELECTOR, <<"selector">>). |
| 30 | +-define(KEYS, <<"keys">>). |
| 31 | +-define(VALUES, <<"values">>). |
| 32 | + |
| 33 | +% Proc commands |
| 34 | +-define(RESET, <<"reset">>). |
| 35 | +-define(ADD_FUN, <<"add_fun">>). |
| 36 | +-define(MAP_DOC, <<"map_doc">>). |
| 37 | +-define(REDUCE, <<"reduce">>). |
| 38 | +-define(REREDUCE, <<"rereduce">>). |
| 39 | + |
| 40 | +-record(st, { |
| 41 | + indexes = [], |
| 42 | + timeout = 5000 |
| 43 | +}). |
| 44 | + |
| 45 | +-record(idx, { |
| 46 | + selector, |
| 47 | + keys, |
| 48 | + values |
| 49 | +}). |
| 50 | + |
| 51 | +start_link() -> |
| 52 | + gen_server:start_link(?MODULE, [], []). |
| 53 | + |
| 54 | +set_timeout(Pid, TimeOut) when is_integer(TimeOut), TimeOut > 0 -> |
| 55 | + gen_server:call(Pid, {set_timeout, TimeOut}). |
| 56 | + |
| 57 | +prompt(Pid, Data) -> |
| 58 | + gen_server:call(Pid, {prompt, Data}). |
| 59 | + |
| 60 | +init(_) -> |
| 61 | + {ok, #st{}}. |
| 62 | + |
| 63 | +handle_call({set_timeout, TimeOut}, _From, #st{} = St) -> |
| 64 | + {reply, ok, St#st{timeout = TimeOut}}; |
| 65 | +handle_call({prompt, [?RESET | _QueryConfig]}, _From, #st{} = St) -> |
| 66 | + {reply, true, St#st{indexes = []}}; |
| 67 | +handle_call({prompt, [?ADD_FUN, IndexInfo | _IgnoreRest]}, _From, #st{} = St) -> |
| 68 | + #st{indexes = Indexes} = St, |
| 69 | + case get_index_def(IndexInfo) of |
| 70 | + #idx{} = Idx -> {reply, true, St#st{indexes = Indexes ++ [Idx]}}; |
| 71 | + undefined -> {reply, true, St} |
| 72 | + end; |
| 73 | +handle_call({prompt, [?MAP_DOC, Doc]}, _From, St) -> |
| 74 | + {reply, map_doc(St, mango_json:to_binary(Doc)), St}; |
| 75 | +handle_call({prompt, [?REDUCE, RedSrcs, _]}, _From, St) -> |
| 76 | + {reply, [true, [null || _ <- RedSrcs]], St}; |
| 77 | +handle_call({prompt, [?REREDUCE, RedSrcs, _]}, _From, St) -> |
| 78 | + {reply, [true, [null || _ <- RedSrcs]], St}; |
| 79 | +handle_call(Msg, _From, St) -> |
| 80 | + {stop, {invalid_call, Msg}, {invalid_call, Msg}, St}. |
| 81 | + |
| 82 | +handle_cast(garbage_collect, St) -> |
| 83 | + erlang:garbage_collect(), |
| 84 | + {noreply, St}; |
| 85 | +handle_cast(stop, St) -> |
| 86 | + {stop, normal, St}; |
| 87 | +handle_cast(Msg, St) -> |
| 88 | + {stop, {invalid_cast, Msg}, St}. |
| 89 | + |
| 90 | +map_doc(#st{indexes = Indexes}, Doc) -> |
| 91 | + lists:map(fun(Idx) -> get_index_entries(Idx, Doc) end, Indexes). |
| 92 | + |
| 93 | +get_index_entries(#idx{} = Idx, Doc) -> |
| 94 | + #idx{selector = Selector, keys = Keys, values = Values} = Idx, |
| 95 | + case should_index(Selector, Doc) of |
| 96 | + false -> []; |
| 97 | + true -> process_doc(Keys, Values, Doc) |
| 98 | + end. |
| 99 | + |
| 100 | +process_doc(Keys, undefined, Doc) -> |
| 101 | + case get_index_values(Keys, Doc) of |
| 102 | + [] -> []; |
| 103 | + [_ | _] = KeyResults -> [[KeyResults, null]] |
| 104 | + end; |
| 105 | +process_doc(Keys, [_ | _] = Values, Doc) -> |
| 106 | + case get_index_values(Keys, Doc) of |
| 107 | + [] -> |
| 108 | + []; |
| 109 | + [_ | _] = KeyResults -> |
| 110 | + case get_index_values(Values, Doc) of |
| 111 | + [] -> []; |
| 112 | + [_ | _] = ValueResults -> [[KeyResults, ValueResults]] |
| 113 | + end |
| 114 | + end. |
| 115 | + |
| 116 | +get_index_values(Fields, Doc) -> |
| 117 | + MapF = fun(Field) -> |
| 118 | + case mango_doc:get_field(Doc, Field) of |
| 119 | + not_found -> not_found; |
| 120 | + bad_path -> not_found; |
| 121 | + Value -> Value |
| 122 | + end |
| 123 | + end, |
| 124 | + Results = lists:map(MapF, Fields), |
| 125 | + case lists:member(not_found, Results) of |
| 126 | + true -> []; |
| 127 | + false -> Results |
| 128 | + end. |
| 129 | + |
| 130 | +should_index(Selector, Doc) -> |
| 131 | + case mango_doc:get_field(Doc, <<"_id">>) of |
| 132 | + <<"_design/", _/binary>> -> false; |
| 133 | + _ -> mango_selector:match(Selector, Doc) |
| 134 | + end. |
| 135 | + |
| 136 | +get_selector({IdxProps}) -> |
| 137 | + case couch_util:get_value(?SELECTOR, IdxProps, {[]}) of |
| 138 | + {L} = Selector when is_list(L) -> mango_selector:normalize(Selector); |
| 139 | + _ -> undefined |
| 140 | + end. |
| 141 | + |
| 142 | +get_field({IdxProps}, <<FieldName/binary>>) -> |
| 143 | + case couch_util:get_value(FieldName, IdxProps) of |
| 144 | + Fields when is_list(Fields) -> |
| 145 | + case lists:all(fun is_binary/1, Fields) of |
| 146 | + true -> Fields; |
| 147 | + false -> undefined |
| 148 | + end; |
| 149 | + _ -> |
| 150 | + undefined |
| 151 | + end. |
| 152 | + |
| 153 | +get_index_def(IndexInfo) -> |
| 154 | + Selector = get_selector(IndexInfo), |
| 155 | + Keys = get_field(IndexInfo, ?KEYS), |
| 156 | + Values = get_field(IndexInfo, ?VALUES), |
| 157 | + case {Selector, Keys, Values} of |
| 158 | + {{_}, [_ | _], [_ | _]} -> |
| 159 | + #idx{selector = Selector, keys = Keys, values = Values}; |
| 160 | + {{_}, [_ | _], undefined} -> |
| 161 | + #idx{selector = Selector, keys = Keys, values = undefined}; |
| 162 | + {_, _, _} -> |
| 163 | + undefined |
| 164 | + end. |
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