refactor: migrate Java XDR generator from xdrgen to SDK (#762)

Author: overcat

Makefile

@@ -13,22 +13,16 @@ xdr/Stellar-internal.x \
 xdr/Stellar-contract-config-setting.x \
 xdr/Stellar-exporter.x
 
-# xdrgen commit to use, see https://github.com/stellar/xdrgen
-XDRGEN_COMMIT=621d042b824f67ac65cc53d0e5e381e24aed4583
 # stellar-xdr commit to use, see https://github.com/stellar/stellar-xdr
 XDR_COMMIT=4b7a2ef7931ab2ca2499be68d849f38190b443ca
 
 .PHONY: xdr xdr-clean xdr-update
 
 xdr-generate: $(XDRS)
-	docker run -it --rm -v $$PWD:/wd -w /wd ruby /bin/bash -c '\
-		gem install specific_install -v 0.3.8 && \
-		gem specific_install https://github.com/lightsail-network/xdrgen.git -b $(XDRGEN_COMMIT) && \
-		xdrgen \
-			--language java \
-			--namespace org.stellar.sdk.xdr \
-			--output src/main/java/org/stellar/sdk/xdr/ \
-			$(XDRS)'
+	docker run --rm -v $$PWD:/wd -w /wd ruby:3.4 /bin/bash -c '\
+		cd xdr-generator && \
+		bundle install --quiet && \
+		bundle exec ruby generate.rb'
 	./gradlew :spotlessApply
 
 xdr/%.x:
@@ -38,4 +32,4 @@ xdr-clean:
 	rm xdr/*.x || true
 	find src/main/java/org/stellar/sdk/xdr -type f -name "*.java" ! -name "package-info.java" -delete
 
-xdr-update: xdr-clean xdr-generate
+xdr-update: xdr-clean xdr-generate

src/main/java/org/stellar/sdk/xdr/Constants.java

@@ -6,21 +6,21 @@
 public final class Constants {
   private Constants() {}
 
+  public static final int AUTH_MSG_FLAG_FLOW_CONTROL_BYTES_REQUESTED = 200;
+  public static final int CONTRACT_COST_COUNT_LIMIT = 1024;
+  public static final int LIQUIDITY_POOL_FEE_V18 = 30;
   public static final int MASK_ACCOUNT_FLAGS = 0x7;
   public static final int MASK_ACCOUNT_FLAGS_V17 = 0xF;
-  public static final int MAX_SIGNERS = 20;
+  public static final int MASK_CLAIMABLE_BALANCE_FLAGS = 0x1;
+  public static final int MASK_LEDGER_HEADER_FLAGS = 0x7;
+  public static final int MASK_OFFERENTRY_FLAGS = 1;
   public static final int MASK_TRUSTLINE_FLAGS = 1;
   public static final int MASK_TRUSTLINE_FLAGS_V13 = 3;
   public static final int MASK_TRUSTLINE_FLAGS_V17 = 7;
-  public static final int MASK_OFFERENTRY_FLAGS = 1;
-  public static final int MASK_CLAIMABLE_BALANCE_FLAGS = 0x1;
-  public static final int MASK_LEDGER_HEADER_FLAGS = 0x7;
-  public static final int AUTH_MSG_FLAG_FLOW_CONTROL_BYTES_REQUESTED = 200;
-  public static final int TX_ADVERT_VECTOR_MAX_SIZE = 1000;
-  public static final int TX_DEMAND_VECTOR_MAX_SIZE = 1000;
   public static final int MAX_OPS_PER_TX = 100;
-  public static final int LIQUIDITY_POOL_FEE_V18 = 30;
-  public static final int SC_SPEC_DOC_LIMIT = 1024;
+  public static final int MAX_SIGNERS = 20;
   public static final int SCSYMBOL_LIMIT = 32;
-  public static final int CONTRACT_COST_COUNT_LIMIT = 1024;
+  public static final int SC_SPEC_DOC_LIMIT = 1024;
+  public static final int TX_ADVERT_VECTOR_MAX_SIZE = 1000;
+  public static final int TX_DEMAND_VECTOR_MAX_SIZE = 1000;
 }

xdr-generator/Gemfile

@@ -0,0 +1,10 @@
+source "https://rubygems.org"
+
+gem "xdrgen", git: "https://github.com/stellar/xdrgen", branch: "master"
+
+# Required for Ruby 3.4+ compatibility
+gem "base64"
+gem "benchmark"
+gem "bigdecimal"
+gem "logger"
+gem "mutex_m"

xdr-generator/Gemfile.lock

@@ -0,0 +1,55 @@
+GIT
+  remote: https://github.com/stellar/xdrgen
+  revision: 9796d627a739533d0c158ce87fde349b5f764f8b
+  branch: master
+  specs:
+    xdrgen (0.1.3)
+      activesupport (~> 6)
+      concurrent-ruby (<= 1.3.4)
+      memoist (~> 0.11.0)
+      slop (~> 3.4)
+      treetop (~> 1.5.3)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (6.1.7.10)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    base64 (0.3.0)
+    benchmark (0.5.0)
+    bigdecimal (4.0.1)
+    concurrent-ruby (1.3.4)
+    i18n (1.14.8)
+      concurrent-ruby (~> 1.0)
+    logger (1.7.0)
+    memoist (0.11.0)
+    minitest (6.0.1)
+      prism (~> 1.5)
+    mutex_m (0.3.0)
+    polyglot (0.3.5)
+    prism (1.9.0)
+    slop (3.6.0)
+    treetop (1.5.3)
+      polyglot (~> 0.3)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    zeitwerk (2.7.4)
+
+PLATFORMS
+  aarch64-linux
+  ruby
+
+DEPENDENCIES
+  base64
+  benchmark
+  bigdecimal
+  logger
+  mutex_m
+  xdrgen!
+
+BUNDLED WITH
+   2.6.9

xdr-generator/generate.rb

@@ -0,0 +1,17 @@
+require 'xdrgen'
+require_relative 'generator/generator'
+
+puts "Generating Java XDR classes..."
+
+# Operate on the root directory of the repo.
+Dir.chdir("..")
+
+# Compile the XDR files into Java.
+Xdrgen::Compilation.new(
+  Dir.glob("xdr/*.x"),
+  output_dir: "src/main/java/org/stellar/sdk/xdr/",
+  generator: Generator,
+  namespace: "org.stellar.sdk.xdr",
+).compile
+
+puts "Done!"