On Hyperledger Fabric Context - hyperledger-fabric

Question

I would appreciate some help with this small issue.
According to the comercial paper smart contract, present in Fabric-samples, one can define a custom Context, which allows handling logic across different transactions.
Can we define a variable in a Context, initialized as 0, and increment it at each transaction? I do not seem able to increment it, i.e., the counter always resets at each transation:
class CustomContext extends Context {
constructor() {
super();
this.comercialPaperList = new PaperList(this);
this.counter = 0;
}
generateLogId() {
return this.numberLogs++;
}
getLatestLogId() {
return this.numberLogs;
}
}
class MyContract extends Contract {
constructor() {
// Unique namespace when multiple contracts per chaincode file
super('...');
}
/**
* Define a custom context for a citius log
*/
createContext() {
return new CustomContext();
I have a test transaction which increments the counter:
async incrementC (ctx) {
let before = await ctx.getLatestLogId();
console.log(before);
let new = await ctx.generateLogId();
console.log(new);
console.log("============== after inc")
let after = await ctx.getLatestLogId();
console.log(after);
}
On the first time I execute the incrementC transaction, I obtain 0, 1, 1, as expected.
On the following times, I obtain exacly the same, as if context did not store the updates.
Any insights?

Answer 1

A Custom context has the same scope as a non custom context, it is the context for the currently executing transaction only. It is not able to span across multiple transaction requests. If the documentation implies this then I would suggest that there is something wrong with the documentation and a jira should be raised at https://jira.hyperledger.org to raise this as an issue.
So unfortunately what you are trying to do will not work.