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const { spawn } = require('child_process');
const fs = require("fs");
const config = require("../../config");
/*
* Gets the local latest zblock
*
* Returns:
* - JSON object
* { zlatest: "Qm..." }
*
*/
function fetchZblock(zblock, res){
const command = spawn("ak-zblock-cache",[zblock]);
command.stdout.on("data", data => {
});
command.stderr.on("data", data => {
console.log(`stderr: ${data}`);
});
command.on('error', (error) => {
console.log(`error: ${error.message}`);
});
command.on("close", code => {
console.log(`child process exited with code ${code}`);
if ( code == 0 ) {
const path = config.zblockDir+"/"+zblock;
try {
if(fs.existsSync(path)){
res.send(JSON.parse(fs.readFileSync(path)));
}
} catch (error) {
res.send({"error":error});
}
} else {
res.send({"error":"invalid or unreachable"});
}
});
};
module.exports = (req, res) => {
console.log(req.query)
if ( (req.query.zblock) && req.query.zblock.length === 46 ){
regex= /Qm[A-Za-z0-9]{44}/;
if (regex.test(req.query.zblock)){
if (req.query.zblock === "QmbFMke1KXqnYyBBWxB74N4c5SBnJMVAiMNRcGu6x1AwQH" ){
res.send({error:"Genesis block"});
} else {
fetchZblock(req.query.zblock,res);
}
} else {
res.send({error:"Invalid data: regexp failed to pass"});
}
} else {
res.send({error:"Invalid data: no valid zblock was provided"});
}
}
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