Fix Brotli compression

README.md

@@ -484,6 +484,15 @@ var writer = await parquet.ParquetWriter.openFile(schema, 'fruits.parquet');
 writer.setRowGroupSize(8192);
 ```
 
+## Browser Tests
+
+To run the browser tests (folder: `test/browser`) in a specific browser:
+
+1. `npm i`
+2. `npm run build:browser`
+3. `npx serve .`
+4. `open http://localhost:3000/test/browser/` in your preferred browser (Trailing `/` is required)
+
 ## Dependencies
 
 Parquet uses [thrift](https://thrift.apache.org/) to encode the schema and other

esbuild-plugins.mjs

@@ -0,0 +1,12 @@
+import path from 'node:path';
+/**
+ * this plugin resolves to a browser version of compression.ts that uses different code for browsers
+ */
+export const compressionBrowserPlugin = {
+  name: 'compressionBrowser',
+  setup(build) {
+    build.onResolve({ filter: /^\.\/compression$/ }, (args) => {
+      return { path: path.join(args.resolveDir, args.path.replace('compression', 'browser/compression.ts')) };
+    });
+  },
+};

esbuild-serve.js → esbuild-serve.mjs

@@ -3,24 +3,27 @@
  * It attaches the parquet.js exports to a "parquetjs" global variable.
  * See the example server for how to use it.
  */
-const { compressionBrowserPlugin, wasmPlugin } = require('./esbuild-plugins');
+import { compressionBrowserPlugin } from './esbuild-plugins.mjs';
+import watPlugin from 'esbuild-plugin-wat';
+import esbuild from 'esbuild';
 // esbuild has TypeScript support by default. It will use .tsconfig
-require('esbuild')
+esbuild
   .context({
     entryPoints: ['parquet.ts'],
     outfile: 'main.js',
     define: { 'process.env.NODE_DEBUG': 'false', 'process.env.NODE_ENV': '"production"', global: 'window' },
     platform: 'browser',
-    plugins: [compressionBrowserPlugin, wasmPlugin],
+    plugins: [compressionBrowserPlugin, watPlugin()],
     sourcemap: 'external',
     bundle: true,
+    minify: false,
     globalName: 'parquetjs',
-    inject: ['./esbuild-shims.js'],
+    inject: ['./esbuild-shims.mjs'],
   })
   .then((context) => {
     context
       .serve({
-        servedir: __dirname,
+        servedir: './',
       })
       .then((server) => {
         console.log('serving parquetjs', server);

esbuild-shims.mjs

@@ -0,0 +1,2 @@
+import { Buffer as buffer } from 'buffer/';
+export let Buffer = buffer;

esbuild.js → esbuild.mjs

@@ -1,6 +1,6 @@
-const esbuild = require('esbuild');
-const path = require('path');
-const { compressionBrowserPlugin, wasmPlugin } = require('./esbuild-plugins');
+import esbuild from 'esbuild';
+import watPlugin from 'esbuild-plugin-wat';
+import { compressionBrowserPlugin } from './esbuild-plugins.mjs';
 // esbuild has TypeScript support by default
 const baseConfig = {
   bundle: true,
@@ -10,11 +10,11 @@ const baseConfig = {
     'process.env.NODE_ENV': '"production"',
     global: 'window',
   },
-  inject: ['./esbuild-shims.js'],
-  minify: true,
+  inject: ['./esbuild-shims.mjs'],
+  minify: false,
   mainFields: ['browser', 'module', 'main'],
   platform: 'browser', // default
-  plugins: [compressionBrowserPlugin, wasmPlugin],
+  plugins: [compressionBrowserPlugin, watPlugin()],
   target: 'es2020', // default
 };
 // configuration for generating test code in browser
@@ -26,39 +26,53 @@ const testConfig = {
     'process.env.NODE_ENV': '"production"',
     global: 'window',
   },
-  inject: ['./esbuild-shims.js'],
+  inject: ['./esbuild-shims.mjs'],
   minify: false,
   mainFields: ['browser', 'module', 'main'],
   platform: 'browser', // default
-  plugins: [compressionBrowserPlugin, wasmPlugin],
+  plugins: [compressionBrowserPlugin, watPlugin()],
   target: 'es2020', // default
 };
 const targets = [
   {
     ...baseConfig,
     globalName: 'parquetjs',
-    outdir: path.resolve(__dirname, 'dist', 'browser'),
+    outdir: './dist/browser',
   },
   {
     ...baseConfig,
     format: 'esm',
-    outfile: path.resolve(__dirname, 'dist', 'browser', 'parquet.esm.js'),
+    outfile: 'dist/browser/parquet.esm.js',
   },
   {
     ...baseConfig,
     format: 'cjs',
-    outfile: path.resolve(__dirname, 'dist', 'browser', 'parquet.cjs.js'),
+    outfile: 'dist/browser/parquet.cjs.js',
   },
-  // Browser test code below
+];
+
+// Browser test code below is only in ESM
+const testTargets = [
   {
     ...testConfig,
-    outfile: path.resolve(__dirname, 'test', 'browser', 'main.js'),
+    format: 'esm',
+    mainFields: ['module', 'main'],
+    outfile: 'test/browser/main.js',
   },
 ];
+
 Promise.all(targets.map(esbuild.build))
   .then((results) => {
     if (results.reduce((m, r) => m && !r.warnings.length, true)) {
-      console.log('built with no errors or warnings');
+      console.log('built dist targets with no errors or warnings');
+    }
+  })
+  .then(() => {
+    return Promise.all(testTargets.map(esbuild.build));
+  })
+  .then((results) => {
+    if (results.reduce((m, r) => m && !r.warnings.length, true)) {
+      console.log('built test targets with no errors or warnings');
     }
   })
   .catch((e) => {

examples/server/views/parquetFiles.ejs

@@ -11,31 +11,38 @@
 <script>
     const port = "<%= port %>"
     const readit = function (filename) {
+        const output = document.getElementById('output');
         parquetjs.ParquetReader
             .openUrl(`http://localhost:${port}/files/${filename}`)
             .then(async (reader) => {
                 let cursor = await reader.getCursor();
 
                 let record = null;
+                output.innerHTML = "";
                 while (record = await cursor.next()) {
+                    output.innerHTML += `\nRecord: ${JSON.stringify(record, (_, v) => typeof v === 'bigint' ? v.toString() : v, 2)}`;
                     console.log("record", record);
                 }
                 return reader;
             })
             .then((reader) => reader.close())
             .catch((e) => {
+                output.innerHTML += `\nERROR: ${e}`;
                 console.log("error", e);
             })
 
     }
 
     const search = async function (filename, columnName, searchTerm) {
+        const output = document.getElementById('output');
         const rdr = await parquetjs.ParquetReader.openUrl(`http://localhost:${port}/files/${filename}`)
         const bfs = await rdr.getBloomFiltersFor([columnName])
         if (!bfs[columnName]) return false
+        output.innerHTML = "";
         Promise.all(bfs[columnName].map(async item => item.sbbf.check(searchTerm)))
             .then(values => {
                 const res = values.some((el) => (el === true));
+                output.innerHTML += `\nResponse "${searchTerm}": ${JSON.stringify(res, null, 2)}`;
                 console.log("res: ", res)
                 return res
             })
@@ -54,10 +61,16 @@
     <li><button onclick="readit('fruits-bloomfilter.parquet')" >with Bloom filter</button></li>
     <li><button onclick="readit('alltypes_dictionary.parquet')" >all types w/ dictionary</button></li>
     <li><button onclick="readit('fruits.parquet')" >With (unsupported) Brötli compression</button></li>
+    <li><button onclick="readit('gzip-nation.impala.parquet')" >With gzip compression</button></li>
+    <li><button onclick="readit('snappy-compressed.parquet')" >With snappy compression</button></li>
+    <li><button onclick="readit('sample_brotli_compressed.parquet')" >With brotli compression</button></li>
     <li><button onclick="readit('list.parquet')" >With list elements</button></li>
 </ul>
 <h3>Search fruits-bloomfilter.parquet "name" column for</h3>
 <button onclick="search('fruits-bloomfilter.parquet', 'name', 'kiwi')">Search fruits-bloomfilter.parquet for "kiwi"</button>
 <button onclick="search('fruits-bloomfilter.parquet', 'name', 'xxx')">Search fruits-bloomfilter.parquet for "xxx"</button>
+
+<h2>Output</h2>
+<pre id="output"></pre>
 </body>
 </html>