convex.run.exec — world.convex/run.clj 0.0.0-alpha3

All aspects of actually executing transactions.

When an error is detected, fail is called.

compile clj

(compile env)

(compile env trx-canonical)

Compiles the given, previously expanded trx using the current context.

See expand.

eval clj

(eval env)

(eval env trx)

Evaluates trx.

exec clj

(exec env)

(exec env trx-compiled)

Runs the given, previously compiled trx using the current context.

See compile.

expand clj

(expand env)

(expand env trx)

Expands the given trx using the current context.

fail clj

(fail env err)

Must be called in case of failure, err being an error map (see the convex.run.err namespace).

Under $.catch/*stack* in the context is a stack of error handling transactions. This functions pops the next error handling transaction and prepends it to $.trx/*list*, the list of transactions pending for execution.

Also, error becomes available under $/*result*.

This simple scheme allows sophisticated exception handling to be implemented from CVX, as seen in the $.catch acccount.

juice clj

(juice env)

Computes consumed juice, extracting max-juice from the current value.

max-juice clj

Maximum juice value set on context prior to handling code.

result clj

(result env)

Extracts a result from the current context attached to env.

sreq clj multimethod

After evaluating a transaction, the runner must check if the result is a special request.

It uses sreq-dispatch to forward the result to the appropriate special request implementation, an "unknown" implementation if it looks like a special request but is not implemented, or the "nil" implementation if it is not a special request.

Implentations of special requests are in the [[convex.run.sreq]] namespace.

sreq-dispatch clj

(sreq-dispatch result)

(sreq-dispatch _env result)

Dispatch function used by the sreq multimethod.

Returns nil if the given result is not a special request.

trx clj

(trx env trx)

Evaluates trx and forwards result to sreq unless an error occured.

trx+ clj

(trx+ env)

Executes transactions located in $.trx/*list* in the context until that list becomes empty.

trx-track clj

(trx-track env trx)

Similar to trx.

However, requests are not performed and juice consumption is tracked by going manually through expand, compile, and exec. Those are reported with the actual result in a map interned under $/*result*.

update-ctx clj

(update-ctx env kw-phase f trx)

Refills the current context with maximum juice and calls f with that context and trx.

The context is then reattached to env.