我一直在尝试在我的代码中添加一个用例,在这个用例中,我试图解压一个太大的压缩包,以适应磁盘空间,我希望我的代码能够抛出ENOSPC。我已经尝试了多个库,但它们都没有抛出错误,而是在没有完成压缩的情况下默默地失败了。我希望它们能抛出ENOSPC错误,但所有的包似乎都记录了第一条info语句,说明解压缩已经开始,但之后就没有了。他们中的大多数人都创建了不完整的文件夹,不管他们在磁盘空间耗尽之前能写什么。下面是我对每个库的代码。
我的代码使用 识别压缩包:
exports.unzip = function(source, destination) {
console.info("Started un-zipping from source: %s to destination: %s", source, destination);
try {
const zip = new AdmZip(source);
zip.extractAllTo(destination, true);
console.info("done unzipping");
} catch (error) {
console.error("Unzipping failed. Reason: %s", error)
throw new Error(error)
}
};
代码使用 yauzl:
exports.extractZip = function(source, destination) {
return new Promise(function(resolve, reject) {
console.log("Extracting zip: '" + source + "' to '" + destination + "'");
yauzl.open(source, {
lazyEntries: true
}, function(err, zipfile) {
if (err) throw err;
zipfile.readEntry();
zipfile.on("error", function (err) {
console.error("Something went wrong while extracting!");
reject(new Error(err));
});
zipfile.on("end", function () {
console.log("Completed extracting zip!");
resolve();
});
zipfile.on("entry", function(entry) {
if (/\/$/.test(entry.fileName)) {
// directory file names end with '/'
mkdirp(destination + '/' + entry.fileName, function(err) {
if (err) {
console.error("Something went wrong while extracting!");
throw err;
}
zipfile.readEntry();
});
} else {
// file entry
zipfile.openReadStream(entry, function(err, readStream) {
if (err) {
console.error("Something went wrong while extracting!");
throw err;
}
// ensure parent directory exists
mkdirp(destination + '/' + path.dirname(entry.fileName), function(err) {
if (err) throw err;
readStream.pipe(fs.createWriteStream(destination + '/' + entry.fileName));
readStream.on("end", function() {
zipfile.readEntry();
});
});
});
}
});
});
});
}
代码使用 拉开拉链:
exports.unzip2 = function(source, destination) {
console.info("Started un-zipping from source: %s to destination: %s", source, destination);
try {
fs.createReadStream(source)
.pipe(unzipper.Extract({ path: destination }))
.on('error',function (err){
console.error("something went wrong", err.code);
throw err;
});
} catch (error) {
console.error("Unzipping failed. Reason: %s", error)
throw new Error(error)
}
};
代码使用 解压缩:
exports.extractArchive = async function(source, destination) {
try {
extract(source, { dir: destination }, function (err) {
if (err) {
console.error("Something went wrong!", err.code);
throw err;
}
});
console.log('Extraction complete')
} catch (err) {
// handle any errors
}
};
我的代码有什么问题吗?是否有什么特别的事件需要我去监听?
经过在Yauzl和unzipper上的一些跟踪和错误,unzipper似乎可以用下面的代码工作(当解压过程中磁盘空间耗尽时,会抛出ENOSPC)。
exports.unzip2 = function(source, destination) {
return new Promise(function(resolve, reject) {
console.info("Started un-zipping from source: %s to destination: %s", source, destination);
try {
var sourceStream = fs.createReadStream(source);
sourceStream.on('error',function (err){
console.error("something went wrong", err.code);
reject(new Error(err));
});
var destinationStream = unzipper.Extract({ path: destination });
destinationStream.on('error',function (err){
console.error("something went wrong", err.code);
reject(new Error(err));
});
destinationStream.on('close',function (){
console.log("Completed extract!");
resolve();
});
sourceStream.pipe(destinationStream).on('error',function (err){
console.error("something went wrong", err.code);
reject(new Error(err));
});;
} catch (error) {
console.error("something went wrong", err.code);
reject(new Error(err));
}
});
};