Flask会话成员不会跨请求持久化

我正在编写一个快速应用程序来查看一个带有一些AJAX样式调用的巨型XML文件viewgroup.我的问题session['groups']不是坚持下去.我有一些旧的阵列只有4个成员卡在某处(cookie？..).view调用时会出现该值.然后,我用最近打开的包含20多个成员的xml文件中的信息覆盖该会话成员.

但是,当viewgroup调用时,会话变量已恢复为旧值,数组中只有4个成员!

代码后跟输出.注意3个sessionStatus()电话

def sessionStatus():
    print "# of groups in session = " + str(len(session['groups']))

@app.route('/')
def index():
    cams = [file for file in os.listdir('xml/') if file.lower().endswith('xml')]
    return render_template('index.html', cam_files=cams)

@app.route('/view/')
def view(xmlfile):
    path = 'xml/' + secure_filename(xmlfile)
    print 'opening ' + path
    xmlf = open(path, 'r')
    tree = etree.parse(xmlf)
    root = tree.getroot()
    p = re.compile(r'Group')
    groups = []
    for g in root:
        if (p.search(g.tag) is not None) and (g.attrib['Comment'] != 'Root'):
            groups.append(Group(g.attrib['Comment']))
    sessionStatus()
    session['groups'] = groups
    sessionStatus()
    return render_template('view.html', xml=xmlfile, groups=groups)

@app.route('/viewgroup/')
def viewGroup(name):
    groups = session['groups']
    sessionStatus()        
    if groups is None or len(groups) == 0:
        raise Exception('invalid group name')
    groups_filtered = [g for g in groups if g.name == name]
    if len(groups_filtered) != 1:
        raise Exception('invalid group name', groups_filtered)
    group = groups_filtered[0]
    prop_names = [p.name for p in group.properties]
    return prop_names

产量

opening xml/d.xml
# of groups in session = 5
# of groups in session = 57
127.0.0.1 - - [17/Aug/2011 17:27:29] "GET /view/d.xml HTTP/1.1" 200 -
127.0.0.1 - - [17/Aug/2011 17:27:29] "GET /static/ivtl.css HTTP/1.1" 304 -
127.0.0.1 - - [17/Aug/2011 17:27:29] "GET /static/jquery.js HTTP/1.1" 304 -
127.0.0.1 - - [17/Aug/2011 17:27:29] "GET /static/raphael-min.js HTTP/1.1" 304 -
127.0.0.1 - - [17/Aug/2011 17:27:29] "GET /static/ivtl.css HTTP/1.1" 304 -
127.0.0.1 - - [17/Aug/2011 17:27:29] "GET /favicon.ico HTTP/1.1" 404 -
# of groups in session = 5
127.0.0.1 - - [17/Aug/2011 17:27:31] "GET /viewgroup/DeviceInformation HTTP/1.1" 200 -

我需要所有57个团体留下来.任何提示？

1> totowtwo..：

---

数据太大而无法序列化到会话中.现在,我将一个密钥生成一个全局字典并将该密钥存储在会话中.

gXmlData[path] = groups    

有一个问题是全球字典将永远存在于越来越多的键,但这个过程并不意味着长寿.

---

您可以使用redis后端来存储字典.有一个很好的功能来存储具有到期日期的密钥(http://redis.io/commands/setex).因此,在第一次设置时,您可以使用会话超时类型定义到期日期 而不是每个让你延长到期或返回会话到期(http://redis.io/commands/expire).值数据大小限制非常大(http://stackoverflow.com/questions/5606106/what-is-the-maximum-value-size-you-can-store-in-redis).