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Unverified Commit 72544b0b authored by Daniel Jacob Chittoor's avatar Daniel Jacob Chittoor
Browse files

Implement retry logic for failed checksum scenario 

Introduce a retry mechanism (up to 3 attempts) to re-download the file
if the integrity check fails, improving the robustness of the installer
against transient network issues.
parent e2ef30a3

app/src/controller/downloader.manager.js

+31 −15
Original line number Diff line number Diff line
@@ -39,24 +39,40 @@ export class Downloader { 
        const file = folder[i];

        current_file = file.path;

        if (filesRequired.includes(file.name) || file.unzip) {

          const blob = await this.download(file.path, (value, total) => {

          const MAX_RETRIES = 3;

          let attempt = 0;

          let blob;

          let checksumSuccess = false;



          while (attempt < MAX_RETRIES && !checksumSuccess) {

            attempt++;

            try {

              blob = await this.download(file.path, (value, total) => {

                onDownloadProgress(value, total, file.name);

              });



              // Simple zip integrity check: fetch "<path>.sha256sum" and compare.

          try {

            const expected = await this.fetchChecksum(`${file.path}.sha256sum`);

              const expected = await this.fetchChecksum(

                `${file.path}.sha256sum`,

              );

              const actual = await this.computeSha256(blob);

              if (expected && actual !== expected) {

                throw new Error(

                  `Checksum mismatch for ${file.name}: expected ${expected} got ${actual}`,

                );

              }

          } catch (checksumError) {

              checksumSuccess = true;

            } catch (err) {

              console.warn(

                `Attempt ${attempt}/${MAX_RETRIES} failed for ${file.name}: ${err.message}`,

              );

              if (attempt >= MAX_RETRIES) {

                throw new Error(

              `Checksum verification failed for ${file.name}: ${checksumError.message || checksumError}`,

                  `Failed to download and verify ${file.name} after ${MAX_RETRIES} attempts: ${err.message}`,

                );

              }

            }

          }



          if (file.unzip) {

            const zipReader = new ZipReader(new BlobReader(blob));