Provide interface to request multiple text product lists in parallel

wxdata/include/scwx/provider/iem_api_provider.hpp

@@ -4,6 +4,7 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 
 #include <boost/outcome/result.hpp>
 
@@ -29,6 +30,10 @@ public:
    ListTextProducts(std::chrono::sys_time<std::chrono::days> date,
                     std::optional<std::string_view>          cccc = {},
                     std::optional<std::string_view>          pil  = {});
+   static boost::outcome_v2::result<std::vector<std::string>>
+   ListTextProducts(std::vector<std::chrono::sys_time<std::chrono::days>> dates,
+                    std::vector<std::string_view> ccccs = {},
+                    std::vector<std::string_view> pils  = {});
 
    static std::vector<std::shared_ptr<awips::TextProductFile>>
    LoadTextProducts(const std::vector<std::string>& textProducts);

wxdata/source/scwx/provider/iem_api_provider.cpp

@@ -6,6 +6,7 @@
 
 #include <boost/json.hpp>
 #include <cpr/cpr.h>
+#include <range/v3/view/cartesian_product.hpp>
 
 #if (__cpp_lib_chrono < 201907L)
 #   include <date/date.h>
@@ -41,8 +42,25 @@ IemApiProvider& IemApiProvider::operator=(IemApiProvider&&) noexcept = default;
 
 boost::outcome_v2::result<std::vector<std::string>>
 IemApiProvider::ListTextProducts(std::chrono::sys_time<std::chrono::days> date,
-                                 std::optional<std::string_view>          cccc,
+                                 std::optional<std::string_view> optionalCccc,
-                                 std::optional<std::string_view>          pil)
+                                 std::optional<std::string_view> optionalPil)
+{
+   std::string_view cccc =
+      optionalCccc.has_value() ? optionalCccc.value() : std::string_view {};
+   std::string_view pil =
+      optionalPil.has_value() ? optionalPil.value() : std::string_view {};
+
+   return ListTextProducts(
+      std::vector<std::chrono::sys_time<std::chrono::days>> {date},
+      {cccc},
+      {pil});
+}
+
+boost::outcome_v2::result<std::vector<std::string>>
+IemApiProvider::ListTextProducts(
+   std::vector<std::chrono::sys_time<std::chrono::days>> dates,
+   std::vector<std::string_view>                         ccccs,
+   std::vector<std::string_view>                         pils)
 {
    using namespace std::chrono;
 
@@ -57,28 +75,50 @@ IemApiProvider::ListTextProducts(std::chrono::sys_time<std::chrono::days> date,
 #   define kDateFormat "%Y-%m-%d"
 #endif
 
-   auto parameters = cpr::Parameters {{"date", df::format(kDateFormat, date)}};
+   if (ccccs.empty())
+   {
+      ccccs.push_back({});
+   }
+
+   if (pils.empty())
+   {
+      pils.push_back({});
+   }
+
+   std::vector<cpr::AsyncResponse> responses {};
+
+   for (const auto& [date, cccc, pil] :
+        ranges::views::cartesian_product(dates, ccccs, pils))
+   {
+      auto parameters =
+         cpr::Parameters {{"date", df::format(kDateFormat, date)}};
 
       // WMO Source Code
-   if (cccc.has_value())
+      if (!cccc.empty())
       {
-      parameters.Add({"cccc", std::string {cccc.value()}});
+         parameters.Add({"cccc", std::string {cccc}});
       }
 
       // AFOS / AWIPS ID / 3-6 length identifier
-   if (pil.has_value())
+      if (!pil.empty())
       {
-      parameters.Add({"pil", std::string {pil.value()}});
+         parameters.Add({"pil", std::string {pil}});
       }
 
-   auto response =
+      responses.emplace_back(
-      cpr::Get(cpr::Url {kBaseUrl_ + kListNwsTextProductsEndpoint_},
+         cpr::GetAsync(cpr::Url {kBaseUrl_ + kListNwsTextProductsEndpoint_},
                        network::cpr::GetHeader(),
-               parameters);
+                       parameters));
-   boost::json::value json = util::json::ReadJsonString(response.text);
+   }
 
    std::vector<std::string> textProducts {};
 
+   for (auto& asyncResponse : responses)
+   {
+      auto response = asyncResponse.get();
+
+      boost::json::value json = util::json::ReadJsonString(response.text);
+
       if (response.status_code == cpr::status::HTTP_OK)
       {
          try
@@ -107,8 +147,10 @@ IemApiProvider::ListTextProducts(std::chrono::sys_time<std::chrono::days> date,
          try
          {
             // Log bad request details
-         auto badRequest = boost::json::value_to<types::iem::BadRequest>(json);
+            auto badRequest =
-         logger_->warn("ListTextProducts bad request: {}", badRequest.detail_);
+               boost::json::value_to<types::iem::BadRequest>(json);
+            logger_->warn("ListTextProducts bad request: {}",
+                          badRequest.detail_);
          }
          catch (const std::exception& ex)
          {
@@ -125,7 +167,8 @@ IemApiProvider::ListTextProducts(std::chrono::sys_time<std::chrono::days> date,
          try
          {
             // Log validation error details
-         auto error = boost::json::value_to<types::iem::ValidationError>(json);
+            auto error =
+               boost::json::value_to<types::iem::ValidationError>(json);
             logger_->warn("ListTextProducts validation error: {}",
                           error.detail_.at(0).msg_);
          }
@@ -140,11 +183,13 @@ IemApiProvider::ListTextProducts(std::chrono::sys_time<std::chrono::days> date,
       }
       else
       {
-      logger_->warn("Could not list text products: {}", response.status_line);
+         logger_->warn("Could not list text products: {}",
+                       response.status_line);
 
          return boost::system::errc::make_error_code(
             boost::system::errc::no_message);
       }
+   }
 
    return textProducts;
 }