feat: add support for no_std env

.github/workflows/rust.yml

@@ -11,7 +11,8 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  CARGO_HACK_ARGS: --feature-powerset --exclude-features default --group-features base64,serde,serde_json,schemars,arbitrary,hex
+  CARGO_HACK_ARGS: --feature-powerset --exclude-features default --group-features base64,serde,serde_json,schemars,arbitrary,hex --skip "embedded_io"
+  EMBEDDED_IO_CARGO_HACK_ARGS: --feature-powerset --exclude-features default --skip "cli,std,base64,serde,serde_json,schemars,arbitrary,hex"
 
 jobs:
 
@@ -90,6 +91,9 @@ jobs:
         name: cargo-hack
         version: 0.5.16
     - run: cargo hack clippy $CARGO_HACK_ARGS --target ${{ matrix.sys.target }} --all-targets
+    # TODO: Features "std" and "embedded_io" cannot be enabled simultaneously.
+    # Is there a better solution to solve it?
+    - run: cargo hack clippy $EMBEDDED_IO_CARGO_HACK_ARGS --target ${{ matrix.sys.target }} --all-targets
 
   test:
     strategy:
@@ -126,6 +130,8 @@ jobs:
         name: cargo-hack
         version: 0.5.16
     - run: cargo hack test $CARGO_HACK_ARGS
+    # TODO: Features "std" and "embedded_io" cannot be enabled simultaneously.
+    - run: cargo hack test $EMBEDDED_IO_CARGO_HACK_ARGS
 
   publish-dry-run:
     if: github.event_name == 'push' || startsWith(github.head_ref, 'release/')

Cargo.toml

@@ -7,7 +7,7 @@ authors = ["Stellar Development Foundation <[email protected]>"]
 license = "Apache-2.0"
 version = "22.0.0"
 edition = "2021"
-rust-version = "1.74.0"
+rust-version = "1.81.0"
 
 [[bin]]
 name = "stellar-xdr"
@@ -19,25 +19,27 @@ doctest = false
 crate-git-revision = "0.0.6"
 
 [dependencies]
-stellar-strkey = { version = "0.0.9", optional = true }
+stellar-strkey = { version = "0.0.11", optional = true }
 base64 = { version = "0.13.0", optional = true }
 serde = { version = "1.0.139", features = ["derive"], optional = true }
 serde_with = { version = "3.0.0", optional = true }
 escape-bytes = { version = "0.1.1", default-features = false }
-hex = { version = "0.4.3", optional = true }
-arbitrary = {version = "1.1.3", features = ["derive"], optional = true}
+hex = { version = "0.4.3", default-features = false, optional = true }
+arbitrary = { version = "1.1.3", features = ["derive"], optional = true }
 clap = { version = "4.2.4", default-features = false, features = ["std", "derive", "usage", "help"], optional = true }
 serde_json = { version = "1.0.89", optional = true }
 thiserror = { version = "1.0.37", optional = true }
 schemars = { version = "0.8.16", optional = true }
+embedded-io-extras = {  version = "0.0.2", default-features = false, optional = true }
 
 [dev-dependencies]
 serde_json = "1.0.89"
 
 [features]
 default = ["std", "curr"]
 std = ["alloc"]
-alloc = ["dep:hex", "dep:stellar-strkey", "escape-bytes/alloc"]
+embedded_io = ["alloc", "dep:embedded-io-extras"]
+alloc = ["dep:hex", "dep:stellar-strkey", "escape-bytes/alloc", "hex/alloc", "embedded-io-extras/alloc"]
 curr = []
 next = []
 

Makefile

@@ -4,7 +4,8 @@ CARGO_HACK_ARGS=--feature-powerset --exclude-features default --group-features b
 
 CARGO_DOC_ARGS?=--open
 
-XDRGEN_VERSION=b7bc57ecdd277c9575930d3e17c12dfaa76655fc
+# TODO: Update this after https://github.com/stellar/xdrgen/pull/205 is merged
+XDRGEN_VERSION=e57dfa9199f476acde88ddb096699c829ad86c28
 # XDRGEN_LOCAL=1
 XDRGEN_TYPES_CUSTOM_STR_IMPL_CURR=PublicKey,AccountId,MuxedAccount,MuxedAccountMed25519,SignerKey,SignerKeyEd25519SignedPayload,NodeId,ScAddress,AssetCode,AssetCode4,AssetCode12,ClaimableBalanceId
 XDRGEN_TYPES_CUSTOM_STR_IMPL_NEXT=PublicKey,AccountId,MuxedAccount,MuxedAccountMed25519,SignerKey,SignerKeyEd25519SignedPayload,NodeId,ScAddress,AssetCode,AssetCode4,AssetCode12,ClaimableBalanceId
@@ -44,7 +45,7 @@ src/curr/generated.rs: $(sort $(wildcard xdr/curr/*.x))
 ifeq ($(XDRGEN_LOCAL),)
 	docker run -i --rm -v $$PWD:/wd -w /wd docker.io/library/ruby:latest /bin/bash -c '\
 		gem install specific_install -v 0.3.8 && \
-		gem specific_install https://github.com/stellar/xdrgen.git -b $(XDRGEN_VERSION) && \
+		gem specific_install https://github.com/lightsail-network/xdrgen.git -b $(XDRGEN_VERSION) && \
 		xdrgen --language rust --namespace generated --output src/curr \
 			--rust-types-custom-str-impl $(XDRGEN_TYPES_CUSTOM_STR_IMPL_CURR) \
 			--rust-types-custom-jsonschema-impl '$(XDRGEN_TYPES_CUSTOM_JSONSCHEMA_IMPL_CURR)' \
@@ -69,7 +70,7 @@ src/next/generated.rs: $(sort $(wildcard xdr/next/*.x))
 ifeq ($(XDRGEN_LOCAL),)
 	docker run -i --rm -v $$PWD:/wd -w /wd docker.io/library/ruby:latest /bin/bash -c '\
 		gem install specific_install -v 0.3.8 && \
-		gem specific_install https://github.com/stellar/xdrgen.git -b $(XDRGEN_VERSION) && \
+		gem specific_install https://github.com/lightsail-network/xdrgen.git -b $(XDRGEN_VERSION) && \
 		xdrgen --language rust --namespace generated --output src/next \
 			--rust-types-custom-str-impl $(XDRGEN_TYPES_CUSTOM_STR_IMPL_NEXT) \
 			--rust-types-custom-jsonschema-impl '$(XDRGEN_TYPES_CUSTOM_JSONSCHEMA_IMPL_NEXT)' \

README.md

@@ -54,6 +54,9 @@ only necessary to use utility functions that depend on serde_json.
 5. `hex` – Enables support for hex in string representations of some types.
 Automatically enabled when serde is enabled.
 6. `schemars` – Enables support for JSON Schema generation. (Experimental)
+7. `embedded_io` - Enables support for encoding and decoding using the
+`embedded-io` library, without relying on `std::io`, making it suitable for
+`no_std` environments. (Experimental)
 
 Features marked experimental may disappear at anytime, see breaking changes
 at anytime, or and may be minimal implementations instead of complete.