如何访问通过管道传输到 feedparser 的请求的响应 headers
How can I access the response headers of a request that is piped to a feedparser
我正在尝试使用请求 js 和 feedparser-promised 库解析 RSS 提要。我可以使用以下代码解析提要。
import Bottleneck from 'bottleneck';
const feedparser = require('feedparser-promised');
const limiter = new Bottleneck({
maxConcurrent: 1,
minTime: 333,
});
const httpOptions = {
uri: val.sourcefeedurl,
resolveWithFullResponse: true,
method: 'GET',
pool: false,
headers: {
'If-None-Match': val.etag,
'If-Modified-Since': val.LastModified,
Connection: 'keep-alive',
ciphers: 'DES-CBC3-SHA',
},
};
const response = await limiter.schedule(() => feedparser.parse(httpOptions));
但是因为我使用 feedparser-promised 库,所以我无法从响应 headers.
中缓存 etag 和 Last Modified
我试过这样修改 feedparser-promised
'use strict';
const request = require('request');
const feedParser = require('./feedParser');
const parse = (requestOptions, feedparserOptions) => {
const metaData = {};
return new Promise((resolve, reject) => {
request.get(requestOptions).on('error', reject).on('response', async resp => {
if (resp.statusCode === 304) {
reject('Source not modified');
} else if (resp.statusCode === 200) {
metaData.etagin = await resp.headers.etag;
metaData.LastModifiedin = await resp.headers['last-modified'];
metaData.LastModifiedLocal = await resp.headers['last-modified'];
// console.log(metaData);
}
}).pipe(feedParser(feedparserOptions).on('error', reject).on('response', resolve));
});
};
module.exports = {
parse
};
下面是 feedParser 文件
'use strict';
const FeedParserStream = require('feedparser');
module.exports = (feedparserOptions, metaData) => {
// console.log(metaData, 'herre');
const parsedItems = [];
const feedparser = new FeedParserStream(feedparserOptions);
// console.log(feedparser);
feedparser.on('readable', () => {
// console.log(resp);
let item;
while (item = feedparser.read()) {
parsedItems.push(item);
}
return parsedItems;
}).on('end', function next() {
this.emit('response', parsedItems);
});
return feedparser;
};
所以我的问题是如何在解决承诺时 return 响应 headers 以及 parsedItems(如代码中所示)。
非常感谢您的帮助。
最后像
一样传递元数据
'use strict';
const FeedParserStream = require('feedparser');
module.exports = (feedparserOptions, metaData) => {
// console.log(metaData, 'herre');
const parsedItems = [];
const feedparser = new FeedParserStream(feedparserOptions);
// console.log(feedparser);
feedparser.on('readable', () => {
// console.log(resp);
let item;
while (item = feedparser.read()) {
parsedItems.push(item);
}
return parsedItems;
}).on('end', function next() {
this.emit('response', { parsedItems, metaData });
});
return feedparser;
};
并且您的 feed-parser 承诺为
'use strict';
const request = require('request');
const feedParser = require('./feedParser');
const parse = (requestOptions, feedparserOptions) => {
const metaData = {};
return new Promise((resolve, reject) => {
request.get(requestOptions).on('error', reject).on('response', async resp => {
if (resp.statusCode === 304) {
reject('Source not modified');
} else if (resp.statusCode === 200) {
metaData.etagin = await resp.headers.etag;
metaData.LastModifiedin = await resp.headers['last-modified'];
metaData.LastModifiedLocal = await resp.headers['last-modified'];
// console.log(metaData);
}
}).pipe(feedParser(feedparserOptions, metaData).on('error', reject).on('response', resolve));
});
};
module.exports = {
parse
};
我正在尝试使用请求 js 和 feedparser-promised 库解析 RSS 提要。我可以使用以下代码解析提要。
import Bottleneck from 'bottleneck';
const feedparser = require('feedparser-promised');
const limiter = new Bottleneck({
maxConcurrent: 1,
minTime: 333,
});
const httpOptions = {
uri: val.sourcefeedurl,
resolveWithFullResponse: true,
method: 'GET',
pool: false,
headers: {
'If-None-Match': val.etag,
'If-Modified-Since': val.LastModified,
Connection: 'keep-alive',
ciphers: 'DES-CBC3-SHA',
},
};
const response = await limiter.schedule(() => feedparser.parse(httpOptions));
但是因为我使用 feedparser-promised 库,所以我无法从响应 headers.
中缓存 etag 和 Last Modified我试过这样修改 feedparser-promised
'use strict';
const request = require('request');
const feedParser = require('./feedParser');
const parse = (requestOptions, feedparserOptions) => {
const metaData = {};
return new Promise((resolve, reject) => {
request.get(requestOptions).on('error', reject).on('response', async resp => {
if (resp.statusCode === 304) {
reject('Source not modified');
} else if (resp.statusCode === 200) {
metaData.etagin = await resp.headers.etag;
metaData.LastModifiedin = await resp.headers['last-modified'];
metaData.LastModifiedLocal = await resp.headers['last-modified'];
// console.log(metaData);
}
}).pipe(feedParser(feedparserOptions).on('error', reject).on('response', resolve));
});
};
module.exports = {
parse
};
下面是 feedParser 文件
'use strict';
const FeedParserStream = require('feedparser');
module.exports = (feedparserOptions, metaData) => {
// console.log(metaData, 'herre');
const parsedItems = [];
const feedparser = new FeedParserStream(feedparserOptions);
// console.log(feedparser);
feedparser.on('readable', () => {
// console.log(resp);
let item;
while (item = feedparser.read()) {
parsedItems.push(item);
}
return parsedItems;
}).on('end', function next() {
this.emit('response', parsedItems);
});
return feedparser;
};
所以我的问题是如何在解决承诺时 return 响应 headers 以及 parsedItems(如代码中所示)。
非常感谢您的帮助。
最后像
一样传递元数据'use strict';
const FeedParserStream = require('feedparser');
module.exports = (feedparserOptions, metaData) => {
// console.log(metaData, 'herre');
const parsedItems = [];
const feedparser = new FeedParserStream(feedparserOptions);
// console.log(feedparser);
feedparser.on('readable', () => {
// console.log(resp);
let item;
while (item = feedparser.read()) {
parsedItems.push(item);
}
return parsedItems;
}).on('end', function next() {
this.emit('response', { parsedItems, metaData });
});
return feedparser;
};
并且您的 feed-parser 承诺为
'use strict';
const request = require('request');
const feedParser = require('./feedParser');
const parse = (requestOptions, feedparserOptions) => {
const metaData = {};
return new Promise((resolve, reject) => {
request.get(requestOptions).on('error', reject).on('response', async resp => {
if (resp.statusCode === 304) {
reject('Source not modified');
} else if (resp.statusCode === 200) {
metaData.etagin = await resp.headers.etag;
metaData.LastModifiedin = await resp.headers['last-modified'];
metaData.LastModifiedLocal = await resp.headers['last-modified'];
// console.log(metaData);
}
}).pipe(feedParser(feedparserOptions, metaData).on('error', reject).on('response', resolve));
});
};
module.exports = {
parse
};