Integrate remote cache server for Bazel

remote-cache-server.js

@@ -0,0 +1,50 @@
+const http = require('http')
+const cache = require('@actions/cache')
+const fs = require('fs')
+
+// https://bazel.build/remote/caching#http-caching
+const server = http.createServer(async (req, res) => {
+  const { method, url } = req
+  const [, , cacheType, sha] = url.split('/')
+  const filePath = `/tmp/cache-${cacheType}-${sha}`
+
+  if (method === 'GET') {
+    try {
+      const cacheId = await cache.restoreCache([filePath], sha)
+      if (!cacheId) {
+        console.log(`Cache miss for ${sha}`)
+        res.writeHead(404)
+        return res.end('Cache miss')
+      }
+      const data = fs.readFileSync(filePath)
+      res.writeHead(200, { 'Content-Type': 'application/octet-stream' })
+      res.end(data)
+    } catch (error) {
+      console.error(`Error retrieving cache for ${sha}: ${error}`)
+      res.writeHead(500)
+      res.end('Internal Server Error')
+    }
+  } else if (method === 'PUT') {
+    const data = []
+    req.on('data', chunk => data.push(chunk))
+    req.on('end', async () => {
+      try {
+        fs.writeFileSync(filePath, Buffer.concat(data))
+        await cache.saveCache([filePath], sha)
+        console.log(`Cache saved for ${sha}`)
+        res.writeHead(201)
+        res.end('Cache saved')
+      } catch (error) {
+        console.error(`Error saving cache for ${sha}: ${error}`)
+        res.writeHead(500)
+        res.end('Internal Server Error')
+      }
+    })
+  } else {
+    res.writeHead(405)
+    res.end('Method Not Allowed')
+  }
+})
+
+const PORT = process.env.PORT || 8080
+server.listen(PORT, () => console.log(`Server listening on port ${PORT}`))