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-module(mod_pubsub_cache_mnesia). |
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-behaviour(mod_pubsub_cache_backend). |
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-include("pubsub.hrl"). |
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-include("jlib.hrl"). |
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-export([start/1, stop/0]). |
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-export([ |
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upsert_last_item/5, |
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get_last_item/2, |
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delete_last_item/2]). |
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%% ------------------------ Backend start/stop ------------------------ |
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-spec start(jid:lserver()) -> ok. |
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start(_) -> |
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create_table(). |
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-spec stop() -> ok. |
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stop() -> |
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:-( |
ok. |
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-spec upsert_last_item(ServerHost :: binary(), |
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Nidx :: mod_pubsub:nodeIdx(), |
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ItemID :: mod_pubsub:itemId(), |
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Publisher :: jid:jid(), |
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Payload::mod_pubsub:payload()) -> ok | {error, Reason :: term()}. |
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upsert_last_item(_ServerHost, Nidx, ItemId, Publisher, Payload) -> |
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CreatedAt = os:system_time(microsecond), |
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try mnesia:dirty_write( |
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#pubsub_last_item{ |
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nodeid = Nidx, |
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itemid = ItemId, |
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creation = {CreatedAt, {Publisher#jid.luser, Publisher#jid.lserver, <<>>}}, |
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payload = Payload} |
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) of |
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ok -> ok |
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catch |
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:-( |
exit:{aborted, Reason} -> {error, Reason} |
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end. |
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-spec get_last_item(ServerHost :: binary(), |
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Nidx :: mod_pubsub:nodeIdx()) -> |
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{ok, mod_pubsub:pubsubLastItem()} | {error, Reason :: term()}. |
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get_last_item(_ServerHost, Nidx) -> |
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try mnesia:dirty_read({pubsub_last_item, Nidx}) of |
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[LastItem] -> {ok, LastItem}; |
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[] -> {error, no_items} |
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catch |
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:-( |
exit:{aborted, Reason} -> {error, Reason} |
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end. |
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-spec delete_last_item(ServerHost :: binary(), |
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Nidx :: mod_pubsub:nodeIdx()) -> ok | {error, Reason :: term()}. |
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delete_last_item(_ServerHost, Nidx) -> |
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try mnesia:dirty_delete({pubsub_last_item, Nidx}) of |
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ok -> ok |
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catch |
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:-( |
exit:{aborted, Reason} -> {error, Reason} |
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end. |
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%% ------------------------ Helpers ---------------------------- |
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-spec create_table() -> ok. |
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create_table() -> |
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mongoose_mnesia:create_table(pubsub_last_item, |
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[{ram_copies, [node()]}, |
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{attributes, record_info(fields, pubsub_last_item)}]), |
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ok. |