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LaunchDarkly SDK for Erlang

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launchdarkly_server_sdk src ldclient_event_dispatch_httpc.erl
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src/ldclient_event_dispatch_httpc.erl 

%%-------------------------------------------------------------------

%% @doc Event dispatcher

%% @private

%% @end

%%-------------------------------------------------------------------



-module(ldclient_event_dispatch_httpc).



-behaviour(ldclient_event_dispatch).



%% Behavior callbacks

-export([send/4]).



%%===================================================================

%% Behavior callbacks

%%===================================================================



%% @doc Send events to LaunchDarkly event server

%%

%% @end

-spec send(JsonEvents :: binary(), PayloadId :: uuid:uuid(), Uri :: string(), SdkKey :: string()) -> 

    ok | {error, temporary, string()} | {error, permanent, string()}.

send(JsonEvents, PayloadId, Uri, SdkKey) ->

    Headers = [

        {"Authorization", SdkKey},

        {"X-LaunchDarkly-Event-Schema", ldclient_config:get_event_schema()},

        {"User-Agent", ldclient_config:get_user_agent()},

        {"X-LaunchDarkly-Payload-ID", uuid:uuid_to_string(PayloadId)}

    ],

    Request = httpc:request(post, {Uri, Headers, "application/json", JsonEvents}, [], []),

    process_request(Request).



%%===================================================================

%% Internal functions

%%===================================================================



-type http_request() :: {ok, {{string(), integer(), string()}, [{string(), string()}], string() | binary()}}.



-spec process_request({error, term()} | http_request()) 

    -> ok | {error, temporary, string()} | {error, permanent, string()}.

process_request({error, Reason}) ->

    {error, temporary, Reason};

process_request({ok, {{_Version, StatusCode, _ReasonPhrase}, _Headers, _Body}}) when StatusCode < 400 ->

    ok;

process_request({ok, {{Version, StatusCode, ReasonPhrase}, _Headers, _Body}}) ->

    Reason = format_response(Version, StatusCode, ReasonPhrase),

    HttpErrorType = is_http_error_code_recoverable(StatusCode),

    {error, HttpErrorType, Reason}.



-spec format_response(Version :: string(), StatusCode :: integer(), ReasonPhrase :: string()) ->

    string().

format_response(Version, StatusCode, ReasonPhrase) ->

    io_lib:format("~s ~b ~s", [Version, StatusCode, ReasonPhrase]).



-spec is_http_error_code_recoverable(StatusCode :: integer()) -> temporary | permanent.

is_http_error_code_recoverable(400) -> temporary;

is_http_error_code_recoverable(408) -> temporary;

is_http_error_code_recoverable(429) -> temporary;

is_http_error_code_recoverable(StatusCode) when StatusCode >= 500 -> temporary;

is_http_error_code_recoverable(_) -> permanent.