生产环境在使用exrm时找不到OTP模块:httpc

Question

我正试图为我的phoenix框架项目创建一个版本。

一切都很好，直到我的代码需要使用OTP中的httpc模块执行特定操作。

显然exrm没有绑定httpc模块，因此找不到它

我曾试图将它添加到我的mix.exs应用程序依赖性中，但一旦我这样做，它就会因为的"错误"而拒绝创建发布

有人知道怎么解决这个问题吗？

对于以httpc作为依赖项的mix.env：

$ MIX_ENV=prod mix release --verbosity=vebose                                                        
        Building release with MIX_ENV=prod.
        ==> Generating relx configuration...
        ==> Generating sys.config...
        ==> Generating boot script...
        ==> Packaging consolidated protocols...
        ==> Generating release...
        ===> Starting relx build process ...
        ===> Resolving OTP Applications from directories:
                  /home/morgan/Documents/rateapi/_build/prod/lib
                  /home/morgan/Documents/rateapi/deps
                  /usr/local/lib/elixir/bin/../lib/eex/ebin
                  /usr/local/lib/elixir/bin/../lib/elixir/ebin
                  /usr/local/lib/elixir/bin/../lib/ex_unit/ebin
                  /usr/local/lib/elixir/bin/../lib/iex/ebin
                  /usr/local/lib/elixir/bin/../lib/logger/ebin
                  /usr/local/lib/elixir/bin/../lib/mix/ebin
                  /home/morgan/Documents/rateapi/lib
                  /usr/erlang/otp_R18B03/lib/erlang/lib
                  /home/morgan/Documents/rateapi/rel
        ==> ERROR: "Failed to build release. Please fix any errors and try again."

对于没有httpc依赖项的mix.env：

** (exit) an exception was raised:
    ** (UndefinedFunctionError) function :httpc.request/4 is undefined (module :httpc is not available)
        :httpc.request(:get, {'http://free.currencyconverterapi.com/api/v3/currencies', []}, [], [])
        (fx_rates) web/controllers/rate_controller.ex:46: FxRates.V1.RateController.reload_currencies/0
        (fx_rates) web/controllers/rate_controller.ex:66: FxRates.V1.RateController.show/2
        (fx_rates) web/controllers/rate_controller.ex:1: FxRates.V1.RateController.action/2
        (fx_rates) web/controllers/rate_controller.ex:1: FxRates.V1.RateController.phoenix_controller_pipeline/2
        (fx_rates) lib/phoenix/router.ex:261: FxRates.Router.dispatch/2
        (fx_rates) web/router.ex:1: FxRates.Router.do_call/2
        (fx_rates) lib/fx_rates/endpoint.ex:1: FxRates.Endpoint.phoenix_pipeline/1

Answer 1

您可能缺少erlang inets包。请尝试安装或重新安装。如果你使用的是Ubuntu，你可以安装：

sudo apt-get install erlang-inets

或者，您可能希望尝试将模块：inets添加到mix.exs应用程序依赖项中。