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-module(mongoose_backend). |
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%% API |
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-export([init/4, |
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call/4, |
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call_tracked/4, |
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is_exported/4, |
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get_backend_name/2]). |
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%% remove after mongoose_rdbms is refactored not to use dynamically compiled backend |
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-ignore_xref([get_backend_name/2]). |
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%% For debugging and tests |
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-export([get_backend_module/2]). |
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-ignore_xref([get_backend_module/2]). |
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-type function_name() :: atom(). |
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-type main_module() :: module(). |
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-type backend_module() :: module(). |
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-type host_type_or_global() :: mongooseim:host_type_or_global(). |
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-spec init(HostType :: host_type_or_global(), |
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MainModule :: main_module(), |
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TrackedFuns :: [function_name()], |
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Opts :: map()) -> ok. |
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init(HostType, MainModule, TrackedFuns, Opts) -> |
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ensure_backend_metrics(MainModule, TrackedFuns), |
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Backend = maps:get(backend, Opts, mnesia), |
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BackendModule = backend_module(MainModule, Backend), |
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persist_backend_name(HostType, MainModule, Backend, BackendModule), |
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ok. |
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backend_module(Module, Backend) -> |
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list_to_atom(atom_to_list(Module) ++ "_" ++ atom_to_list(Backend)). |
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call_metric(MainModule, FunName) -> |
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[backends, MainModule, calls, FunName]. |
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time_metric(MainModule, FunName) -> |
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[backends, MainModule, FunName]. |
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backend_key(HostType, MainModule) -> |
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{backend_module, HostType, MainModule}. |
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backend_name_key(HostType, MainModule) -> |
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{backend_name, HostType, MainModule}. |
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-spec ensure_backend_metrics(MainModule :: main_module(), |
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FunNames :: [function_name()]) -> ok. |
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ensure_backend_metrics(MainModule, FunNames) -> |
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EnsureFun = fun(FunName) -> |
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CM = call_metric(MainModule, FunName), |
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TM = time_metric(MainModule, FunName), |
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mongoose_metrics:ensure_metric(global, CM, spiral), |
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mongoose_metrics:ensure_metric(global, TM, histogram) |
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end, |
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lists:foreach(EnsureFun, FunNames). |
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persist_backend_name(HostType, MainModule, Backend, BackendModule) -> |
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ModuleKey = backend_key(HostType, MainModule), |
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persistent_term:put(ModuleKey, BackendModule), |
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NameKey = backend_name_key(HostType, MainModule), |
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persistent_term:put(NameKey, Backend). |
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%% @doc Get a backend module, stored in init. |
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-spec get_backend_module(HostType :: host_type_or_global(), |
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MainModule :: main_module()) -> |
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BackendModule :: backend_module(). |
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get_backend_module(HostType, MainModule) -> |
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ModuleKey = backend_key(HostType, MainModule), |
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persistent_term:get(ModuleKey). |
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%% @doc Get a backend name, like `pgsql', stored in init. |
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-spec get_backend_name(HostType :: host_type_or_global(), |
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MainModule :: main_module()) -> BackendName :: atom(). |
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get_backend_name(HostType, MainModule) -> |
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Key = backend_name_key(HostType, MainModule), |
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persistent_term:get(Key). |
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-spec call(HostType :: host_type_or_global(), |
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MainModule :: main_module(), |
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FunName :: function_name(), |
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Args :: [term()]) -> term(). |
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call(HostType, MainModule, FunName, Args) -> |
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BackendModule = get_backend_module(HostType, MainModule), |
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erlang:apply(BackendModule, FunName, Args). |
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-spec call_tracked(HostType :: host_type_or_global(), |
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MainModule :: main_module(), |
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FunName :: function_name(), |
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Args :: [term()]) -> term(). |
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call_tracked(HostType, MainModule, FunName, Args) -> |
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BackendModule = get_backend_module(HostType, MainModule), |
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CM = call_metric(MainModule, FunName), |
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TM = time_metric(MainModule, FunName), |
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mongoose_metrics:update(global, CM, 1), |
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{Time, Result} = timer:tc(BackendModule, FunName, Args), |
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mongoose_metrics:update(global, TM, Time), |
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Result. |
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-spec is_exported(HostType :: host_type_or_global(), |
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MainModule :: main_module(), |
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FunName :: function_name(), |
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Arity :: integer()) -> boolean(). |
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is_exported(HostType, MainModule, Function, Arity) -> |
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BackendModule = get_backend_module(HostType, MainModule), |
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erlang:function_exported(BackendModule, Function, Arity). |