Fallback in Contract Dev if no worker

js/src/util/solidity.js

@@ -0,0 +1,79 @@
+// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+import solc from 'solc/browser-wrapper';
+
+export default class SolidityUtils {
+
+  static compile (data, compiler) {
+    const { sourcecode, build, optimized = 1 } = data;
+
+    const start = Date.now();
+    console.log('[solidity] compiling...');
+
+    const input = {
+      '': sourcecode
+    };
+
+    const compiled = compiler.compile({ sources: input }, optimized);
+
+    const time = Math.round((Date.now() - start) / 100) / 10;
+    console.log(`[solidity] done compiling in ${time}s`);
+
+    compiled.version = build.longVersion;
+    compiled.sourcecode = sourcecode;
+
+    return compiled;
+  }
+
+  static getCompiler (build, _fetcher) {
+    const { longVersion, path } = build;
+
+    const URL = `https://raw.githubusercontent.com/ethereum/solc-bin/gh-pages/bin/${path}`;
+
+    const fetcher = typeof _fetcher === 'function'
+      ? _fetcher
+      : (url) => fetch(url);
+
+    const isWorker = typeof window !== 'object';
+
+    return fetcher(URL)
+      .then((r) => r.text())
+      .then((code) => {
+        // `window` for main thread, `self` for workers
+        const _self = isWorker ? self : window;
+        _self.Module = {};
+
+        const solcCode = code.replace('var Module;', `var Module=${isWorker ? 'self' : 'window'}.Module;`);
+
+        console.log(`[solidity] evaluating ${longVersion}`);
+
+        try {
+          // eslint-disable-next-line no-eval
+          eval(solcCode);
+        } catch (e) {
+          return Promise.reject(e);
+        }
+
+        console.log(`[solidity] done evaluating ${longVersion}`);
+
+        const compiler = solc(_self.Module);
+        delete _self.Module;
+
+        return compiler;
+      });
+  }
+}