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Update streams example to use async/await #213

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merged 1 commit into from
Mar 26, 2023
Merged

Update streams example to use async/await #213

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136 changes: 62 additions & 74 deletions streams/simple-writer/index.html
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Original file line number Diff line number Diff line change
@@ -1,81 +1,69 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<head>
<meta charset="UTF-8" />
<title>Simple writer example</title>
</head>
<body>
<h1>Simple writer example</h1>
</head>
<body>
<h1>Simple writer example</h1>

<h2>Results</h2>
<h2>Results</h2>

<ul>
<ul></ul>

</ul>

<script>
const list = document.querySelector('ul');

function sendMessage(message, writableStream) {
// defaultWriter is of type WritableStreamDefaultWriter
const defaultWriter = writableStream.getWriter();
const encoder = new TextEncoder();
const encoded = encoder.encode(message);
encoded.forEach((chunk) => {
defaultWriter.ready
.then(() => {
return defaultWriter.write(chunk);
})
.then(() => {
console.log("Chunk written to sink.");
})
.catch((err) => {
console.log("Chunk error:", err);
});
});
// Call ready again to ensure that all chunks are written
// before closing the writer.
defaultWriter.ready
.then(() => {
defaultWriter.close();
})
.then(() => {
console.log("All chunks written");
})
.catch((err) => {
console.log("Stream error:", err);
});
}

const decoder = new TextDecoder("utf-8");
const queuingStrategy = new CountQueuingStrategy({ highWaterMark: 1 });
let result = "";
const writableStream = new WritableStream({
// Implement the sink
write(chunk) {
return new Promise((resolve, reject) => {
var buffer = new ArrayBuffer(1);
var view = new Uint8Array(buffer);
view[0] = chunk;
var decoded = decoder.decode(view, { stream: true });
var listItem = document.createElement('li');
listItem.textContent = "Chunk decoded: " + decoded;
list.appendChild(listItem);
result += decoded;
resolve();
});
},
close() {
var listItem = document.createElement('li');
listItem.textContent = "[MESSAGE RECEIVED] " + result;
list.appendChild(listItem);
},
abort(err) {
console.log("Sink error:", err);
}
}, queuingStrategy);

sendMessage("Hello, world.", writableStream);
</script>
</body>
<script>
const list = document.querySelector("ul");
async function sendMessage(message, writableStream) {
// defaultWriter is of type WritableStreamDefaultWriter
const defaultWriter = writableStream.getWriter();
const encoder = new TextEncoder();
const encoded = encoder.encode(message);
try {
for (const chunk of encoded) {
await defaultWriter.ready;
await defaultWriter.write(chunk);
console.log("Chunk written to sink.");
}
// Call ready again to ensure that all chunks are written
// before closing the writer.
await defaultWriter.ready;
await defaultWriter.close();
console.log("All chunks written");
} catch (err) {
console.log("Error:", err);
}
}
const decoder = new TextDecoder("utf-8");
const queuingStrategy = new CountQueuingStrategy({ highWaterMark: 1 });
let result = "";
const writableStream = new WritableStream(
{
// Implement the sink
write(chunk) {
return new Promise((resolve, reject) => {
const buffer = new ArrayBuffer(1);
const view = new Uint8Array(buffer);
view[0] = chunk;
const decoded = decoder.decode(view, { stream: true });
const listItem = document.createElement("li");
listItem.textContent = `Chunk decoded: ${decoded}`;
list.appendChild(listItem);
result += decoded;
resolve();
});
},
close() {
const listItem = document.createElement("li");
listItem.textContent = `[MESSAGE RECEIVED] ${result}`;
list.appendChild(listItem);
},
abort(err) {
console.log("Sink error:", err);
},
},
queuingStrategy
);
sendMessage("Hello, world.", writableStream);
</script>
</body>
</html>