Initial commit

src/currencyservice/proto/currency_service.proto

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+syntax = "proto3";
+package hipstershop;
+
+message Empty {}
+
+service CurrencyService {
+    rpc GetSupportedCurrencies(Empty) returns (GetSupportedCurrenciesResponse) {}
+    rpc Convert(CurrencyConversionRequest) returns (Money) {}
+}
+// Describes a money amount without currency. For example, decimal=2 and
+// fractional=500 (or fractional=5) makes up 2.5 units.
+message MoneyAmount {
+    uint32 decimal = 1;
+    uint32 fractional = 2;
+}
+message Money {
+    // The 3-letter currency code defined in ISO 4217.
+    string currency_code = 1;
+    MoneyAmount amount = 2;
+}
+message GetSupportedCurrenciesResponse {
+    // The 3-letter currency code defined in ISO 4217.
+    repeated string currency_codes = 1;
+}
+message CurrencyConversionRequest {
+    Money from = 1;
+    // The 3-letter currency code defined in ISO 4217.
+    string to_code = 2;
+}