基于 OpenWhisk 实时监测静态网页是否有乱码（2）实例-4
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- UID
- 1066743
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基于 OpenWhisk 实时监测静态网页是否有乱码（2）实例-4
自定义Slack Post Action将检测结果发送到Slack指定的Channel OpenWhisk Catalog自带了Slack Post Action，但是自带的Slack Post Action功能有限，不能满足本实例的需求，所以需要自定义Slack Post方法来发送检测结果到Slack Channel。自定的基本步骤如下：
- 为您的团队创建一个Slack并且配置Slack ，配置好Slack之后，可以拿到类似如下的 Webhook URL：
- 用生成的 Webhook URL 和对应的Channel创建一个 Package
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| $ wsk package create myCustomSlack --param url "https://hooks.slack.com/services/..." --param username Bob --param channel "#MySlackChannel"
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- 需要写一个函数接收 Garbage Char Detection Action 传来的数据，然后发送到 Slack ，并用该函数来创建 post2slack Action
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| $ wsk action create myCustomSlack/post2slack slackPost.js
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其中 内容如下：
代码清单4. SlackPost.js1
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| var request = require('request');
var utils = {
map : function(arr, func){
var res = [];
for(var i=0,len=arr.length; i<len; i++){
res.push(func(arr));
}
return res;
},
encodeStrings : function(arr){
return utils.map(arr, querystring.escape);
},
decodeStrings : function(arr){
return utils.map(arr, decodeURI);
},
};
/**
* Action to post to slack
* @param {string} url - Slack webhook url
* @param {string} channel - Slack channel to post the message to
* @param {string} username - name to post to the message as
* @param {string} text - message to post
* @param {string} icon_emoji - (optional) emoji to use as the icon for the
message
* @param {string} as_user - (optional) when the token belongs to a bot,
whether to post as the bot itself
* @param {object} attachments - (Optional) message attachments
* @return {object} whisk async
*/
function main(params){
if (checkParams(params)){
d = params.result;
console.log('Result: ', d);
for(var i=0,len=d.length; i<len; i++){
d['garbled_lines'] = utils.decodeStrings(d['garbled_lines']);
}
console.log('Decoded Result: ', d);
var body = {
channel: params.channel,
username: params.username || 'Simple Message Bot',
text: format(JSON.stringify(d, null, '\t'))
};
if (params.icon_emoji){
body.icon_emoji = params.icon_emoji;
}
if (params.token){
//
// this allows us to support /api/chat.postMessage
// e.g. users can pass params.url =
https://slack.com/api/chat.postMessage
// and params.token = \u003ctheir auth token\u003e
//
body.token = params.token;
} else {
//
// the webhook api expects a nested payload
//
// Notice that we need to stringify; this is due to limitations
// of the formData npm: it does not handle nested objects
//
console.log(body);
console.log("to: "+ params.url);
body = {
payload: JSON.stringify(body)
};
}
if (params.as_user === true){
body.as_user = true;
}
if (params.attachments) {
body.attachments = params.attachments;
}
var promise = new Promise(function(resolve, reject){
request.post({
url: params.url,
formData: body,
}, function(err, res, body) {
if (err) {
console.log('Error: ', err, body);
reject(err);
} else {
console.log('Success: ', params.text, ' successfully sent');
resolve();
}
});
});
return promise;
}
}
/**
*
* Checks if all required params are set
*/
function checkParams(params){
console.log('Post2Slack params: ', params);
if (params.result === undefined) {
whisk.error('No post data provided');
return false;
}
if (params.url === undefined) {
whisk.error('No webhook URL provided');
return false;
}
if (params.channel === undefined) {
whisk.error('No channel provided');
return false;
}
return true;
}
/**
* format text to slack
*/
function format(str){
return '\n\`\`\`'+str+'\n\`\`\`';
}
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- 将 post2slack action 加入到 git2slack Sequence
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| $ wsk action create myCustomSlack/post2slack slackPost.js
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为了调试方便，我们没有让GitHub Trigger来触发，还是先手动传入测试数据
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| $ wsk action create git2slack --sequence garbageDetectionAction,myCustomSlack/post2slack
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测试git2slack序列：
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| $ wsk action invoke git2slack --blocking --result -p payload
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，
输出结果如图8：
图8. 触发git2slack action结果 当一切调试通过之后，我们在更新git2slack 序列，将getPushPayloadAction加入到git2slack序列，并更新git2slackRule.
通过以下命令更新git2slack序列：
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| $ wsk action update git2slack –sequence getPushPayloadAction,garbageDetectAction,myCustomSlack/post2slack
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通过如下命令集更新git2slackRule：
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| $ wsk rule disable git2slackRule
$ wsk rule update git2slackRule gitTrigger git2slack
$ wsk rule enable git2slackRule
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完成以上步骤之后，我们更新测试应用程序中的文档garbledUTF8-2.html，然后部署到Bluemix平台，并且push到GitHub Repository，这时我们在Slack会收到如下通知：
图9. Git仓库更新触发git2slck action图 如图10，我们可以看到所有的Unicode在Slack上都显示"?".经过查看 源代码，发现OpenWhisk只支持ASCII，并不支持Unicode.
图10. Unicode字符显示异常图 |
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