[英]Error: ENOENT: no such file or directory, open When trying to access a directory with fs
I am not knowledgeable in nodejs or express, I have an API running on http://localhost:3000 and one of the endpoints call a function that uses file system to read file synchronously.我对 nodejs 或 express 不了解,我有一个在 http://localhost:3000 上运行的 API,并且其中一个端点调用了一个使用文件系统同步读取文件的函数。 When I make a post request on postman, it says in the console that it can't read a path that doesn't exist (which does to my understanding).
当我在邮递员上发出发布请求时,它在控制台中说它无法读取不存在的路径(据我了解)。
Relevant code:相关代码:
index.js index.js
app.post('/write',(req,res)=>
{
var body = req.body;
console.log('endpoint reached');
console.log(body);
logic.append(body.key,body.path);
res.send('Writting to state was successful');
});
stateLogic.js (this occurs on first initialization of trieRoot) stateLogic.js(这发生在第一次初始化 trieRoot 时)
async append(key,path)
{
var trieRoot = Buffer.from(programData.volatile.modularVariables.readSync(programData.persistent.paths.srcRoot,programData.volatile.modularVariables.encoding.utf8),'hex');
console.log(trieRoot);
var db = programData.persistent.states.singularity;
var trie = new merkle_patricia_tree_1.SecureTrie(db,trieRoot);
var data = programData.volatile.modularVariables.readSync(path,programData.volatile.modularVariables.encoding.utf8);
var format = programData.volatile.modularVariables.getFormat(path);
var name = programData.volatile.modularVariables.getName(path);
var inData = JSON.stringify({name,format,data});
console.log(`key: ${key} value: ${inData}`);
await trie.put(Buffer.from(key),Buffer.from(inData));
var root = await trie.root;
programData.volatile.modularVariables.write(programData.persistent.paths.srcRoot,root.toString('hex'),programData.volatile.modularVariables.writeCB);
var retGet = await trie.get(Buffer.from(key));
console.log('Get returned:'+retGet.toString());
console.log(`From Stack: ${root.toString('hex')} From File: ${this.malleableVar}`);
return;
};
readSync function used:使用的 readSync 函数:
readSync: (file,encoding)=>{return fs.readFileSync(file,{encoding:encoding,flag:'r'})},
srcRoot value used:使用的 srcRoot 值:
srcRoot: './storage/root.txt'
Console Error:控制台错误:
(node:18808) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open './storage/root.txt'
Questions:问题:
Why does it say the path doesn't exist when it does?为什么它说路径不存在? And what is it I am doing wrong?
我做错了什么? Thank you for your time.
感谢您的时间。
You've to use absolute path
instead of relative path
您必须使用
absolute path
而不是relative path
Modify your index.js
with the below code:使用以下代码修改您的
index.js
:
const path = require('path') // <-- import path module to use absolute path.
app.post('/write',(req,res)=>
{
var body = req.body;
const absPath = path.join(__dirname, body.path); // <-- absolute path
console.log("Absolute Path: ", absPath);
logic.append(body.key, absPath);
res.send('Writting to state was successful');
});
Note: If you're still facing the same error, then check body.path
value.注意:如果您仍然面临同样的错误,请检查
body.path
值。
we can use path module to provide absolute path for the directory我们可以使用路径模块为目录提供绝对路径
folder
|-server.js
|-cert.pem
Inside server.js file在 server.js 文件中
const const path = require('path')
const certpath = path.join(__dirname,'chain.pem'); // folder\chain.pem
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