18 lines
920 B
JavaScript
18 lines
920 B
JavaScript
'use strict';
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function createJsonRepository({fsp,crypto,processId=process.pid}={}){
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if(!fsp?.readFile||!fsp?.writeFile||!fsp?.rename||!crypto?.randomBytes)throw new TypeError('Filesystem and crypto adapters are required');
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const read=async(file,{missing=null}={})=>{
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try{return JSON.parse(await fsp.readFile(file,'utf8'))}
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catch(error){if(error.code==='ENOENT'&&missing!==undefined)return typeof missing==='function'?missing():missing;throw error}
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};
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const write=async(file,value)=>{
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const temporary=`${file}.${processId}.${crypto.randomBytes(6).toString('hex')}.tmp`;
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await fsp.writeFile(temporary,JSON.stringify(value),{encoding:'utf8',mode:0o600});
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await fsp.rename(temporary,file);
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};
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const remove=async file=>fsp.unlink(file).catch(error=>{if(error.code!=='ENOENT')throw error});
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return Object.freeze({read,write,remove});
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}
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module.exports=Object.freeze({createJsonRepository});
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