python - 在 python + flask + gunicorn + nginx + Compute Engine 应用程序中从 Google Cloud Storage 读取文件失败

Question

在 python + flask + gunicorn + nginx + Compute Engine 应用程序中读取从 Google Cloud Storage 下载的文件失败。代码链接:https://github.com/samuq/CE-test .文件“ETL_SHP_READ_SQL_WRITE”的第 64 行没有返回任何内容，尽管该文件有效并且其中包含数据:

prj_blob.download_to_file(self.prj_file)
logger.log_text(self.prj_file)
line 64 -->       euref_fin.ImportFromWkt(self.prj_file.read())).

Answer 1

file.seek(0) 帮助解决了问题；不知何故，我假设在 blob.download_to_file(file_name) 之后，文件阅读器不在文件的开头。代码:

    try:
        fd, path = tempfile.mkstemp()
        with os.fdopen(fd, 'w+') as prj_file:
            # do stuff with temp file
            prj_blob.download_to_file(prj_file)
            prj_file.seek(0)
            euref_fin.ImportFromWkt(prj_file.read())
            logger.log_text(str(euref_fin))
            logger.log_text('euref_fin printed!')
    finally:
        os.remove(path)