Function readFileRecord

apps/sim/lib/copilot/vfs/file-reader.ts:287–424

(record: WorkspaceFileRecord)

 * nests underneath for the image-resize path.
 */
export async function readFileRecord(record: WorkspaceFileRecord): Promise<FileReadResult | null> {
  const startedAt = Date.now()
  const result = await getVfsTracer().startActiveSpan(
    TraceSpan.CopilotVfsReadFile,
    {
      attributes: {
        [TraceAttr.CopilotVfsFileName]: record.name,
        [TraceAttr.CopilotVfsFileMediaType]: record.type,
        [TraceAttr.CopilotVfsFileSizeBytes]: record.size,
        [TraceAttr.CopilotVfsFileExtension]: getExtension(record.name),
      },
    },
    async (span) => {
      try {
        if (isImageFileType(record.type)) {
          span.setAttribute(TraceAttr.CopilotVfsReadPath, CopilotVfsReadPath.Image)
          const originalBuffer = await fetchWorkspaceFileBuffer(record)
          const prepared = await prepareImageForVision(originalBuffer, record.type)
          if (!prepared) {
            span.setAttribute(TraceAttr.CopilotVfsReadOutcome, CopilotVfsReadOutcome.ImageTooLarge)
            return {
              content: `[Image too large: ${record.name} (${(record.size / 1024 / 1024).toFixed(1)}MB, limit 5MB after resize/compression)]`,
              totalLines: 1,
            }
          }
          const sizeKb = (prepared.buffer.length / 1024).toFixed(1)
          const resizeNote = prepared.resized ? ', resized for vision' : ''
          span.setAttributes({
            [TraceAttr.CopilotVfsReadOutcome]: CopilotVfsReadOutcome.ImagePrepared,
            [TraceAttr.CopilotVfsReadOutputBytes]: prepared.buffer.length,
            [TraceAttr.CopilotVfsReadOutputMediaType]: prepared.mediaType,
            [TraceAttr.CopilotVfsReadImageResized]: prepared.resized,
          })
          return {
            content: `Image: ${record.name} (${sizeKb}KB, ${prepared.mediaType}${resizeNote})`,
            totalLines: 1,
            attachment: {
              type: 'image',
              name: record.name,
              source: {
                type: 'base64' as const,
                media_type: prepared.mediaType,
                data: prepared.buffer.toString('base64'),
              },
            },
          }
        }

        if (isReadableType(record.type)) {
          span.setAttribute(TraceAttr.CopilotVfsReadPath, CopilotVfsReadPath.Text)
          if (record.size > MAX_TEXT_READ_BYTES) {
            span.setAttribute(TraceAttr.CopilotVfsReadOutcome, CopilotVfsReadOutcome.TextTooLarge)
            return {
              content: `[File too large to display inline: ${record.name} (${record.size} bytes, limit ${MAX_TEXT_READ_BYTES})]`,
              totalLines: 1,
            }
          }