Add wasm support

Add a module "wasm" with utilities to be used in the bdk playground:
- A WasmWallet structure, to create a wallet and run commands
- A compile function, to compile policies into descriptors

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Change rpc `--skip-blocks` option to `--start-time` which specifies time initial sync will start scanning from.
 - Add new `bdk-cli node <command> [<args>]` to control the backend node deployed by `regtest-*` features.
 - Add an integration testing framework in `src/tests/integration.rs`. This framework uses the `regtest-*` feature to run automated testing with bdk-cli.
+- Add a module `wasm` containing objects to use bdk-cli from web assembly
 
 ## [0.5.0]
 

Cargo.toml

@@ -27,7 +27,20 @@ fd-lock = { version = "=3.0.2", optional = true }
 regex = { version = "1", optional = true }
 bdk-reserves = { version = "0.22", optional = true }
 electrsd = { version= "0.19", features = ["bitcoind_22_0"], optional = true}
-tokio = { version = "1", features = ["rt", "macros", "rt-multi-thread"], optional = true }
+
+# Platform-specific dependencies
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+wasm-bindgen = { version = "=0.2.79", features = ["serde-serialize"] }
+wasm-bindgen-futures = { version = "0.4" }
+js-sys = "=0.3.56"
+wasm-logger = "0.2.0"
+secp256k1 = { version = "0.22.0", default-features = false }
+rand = { version = "^0.6", features = ["wasm-bindgen"] }
+serde = { version = "^1.0", features = ["derive"] }
+regex = { version = "1" }
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+tokio = { version = "1", features = ["rt", "macros", "rt-multi-thread"] }
 
 [features]
 default = ["repl", "sqlite-db"]
@@ -45,7 +58,7 @@ electrum = ["bdk/electrum"]
 compact_filters = ["bdk/compact_filters"]
 esplora = []
 esplora-ureq = ["esplora", "bdk/use-esplora-ureq"]
-async-interface = ["bdk/async-interface", "tokio"]
+async-interface = ["bdk/async-interface"]
 esplora-reqwest = ["esplora", "bdk/use-esplora-reqwest", "bdk/reqwest-default-tls", "async-interface"]
 
 # Use this to consensus verify transactions at sync time
@@ -68,4 +81,4 @@ regtest-bitcoin = ["regtest-node" , "rpc"]
 regtest-electrum = ["regtest-node", "electrum", "electrsd/electrs_0_8_10"]
 #TODO: Check why esplora in electrsd isn't working.
 #regtest-esplora-ureq = ["regtest-node", "esplora-ureq", "electrsd/esplora_a33e97e1"]
-#regtest-esplora-reqwest = ["regtest-node", "esplora-reqwest", "electrsd/esplora_a33e97e1"]
+#regtest-esplora-reqwest = ["regtest-node", "esplora-reqwest", "electrsd/esplora_a33e97e1"]

src/commands.rs

@@ -537,7 +537,7 @@ pub enum KeySubCommand {
  },
 }
 
-#[cfg(feature = "repl")]
+#[cfg(any(feature = "repl", target_arch = "wasm32"))]
 #[derive(Debug, StructOpt, Clone, PartialEq)]
 #[structopt(global_settings =&[AppSettings::NoBinaryName], rename_all = "lower")]
 pub enum ReplSubCommand {

src/main.rs

@@ -14,6 +14,9 @@ mod commands;
 mod handlers;
 mod nodes;
 mod utils;
+#[cfg(target_arch = "wasm32")]
+mod wasm;
+
 use bitcoin::Network;
 
 use log::{debug, error, warn};
@@ -24,10 +27,11 @@ use bdk::{bitcoin, Error};
 use bdk_macros::{maybe_async, maybe_await};
 use structopt::StructOpt;
 
-#[cfg(feature = "repl")]
+#[cfg(any(feature = "repl", target_arch = "wasm32"))]
 const REPL_LINE_SPLIT_REGEX: &str = r#""([^"]*)"|'([^']*)'|([\w\-]+)"#;
 
 #[maybe_async]
+#[cfg(not(target_arch = "wasm32"))]
 #[cfg_attr(feature = "async-interface", tokio::main)]
 fn main() {
  env_logger::init();
@@ -50,3 +54,7 @@ fn main() {
  },
  }
 }
+
+// wasm32 requires a non-async main
+#[cfg(target_arch = "wasm32")]
+fn main() {}