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| const { toArray, toPromise, delay } = require("./util");
function call(context, interpreters, fn, ...args) {
Iif (!context) return Promise.reject(new Error("context required"));
Iif (!fn) return Promise.reject(new Error("function required"));
const gen = fn.apply(null, args);
const el = newExecutionLog();
const childContext = Object.assign({}, context);
childContext.stack = childContext.stack || [];
childContext.stack.push({
context: childContext,
interpreters,
fn,
args
});
// clean up circular references to allow for serialization
childContext.stack = childContext.stack.map(s => {
s.context = Object.assign({}, s.context, { stack: undefined });
return s;
});
const start = Date.now();
onCall({ args, fn, context: childContext });
return run(childContext, interpreters, fn, gen, null, el)
.then(result => {
Eif (!childContext.onCallComplete) return result;
const end = Date.now();
onCallComplete({
success: true,
fn,
result,
context: childContext,
start,
end,
latency: end - start
});
return result;
})
.catch(e => {
onError(e, childContext);
if (!childContext.onCallComplete) return Promise.reject(e);
const end = Date.now();
onCallComplete({
success: false,
fn,
result: e,
context: childContext,
start,
end,
latency: end - start
});
return Promise.reject(e);
});
}
function run(context, interpreters, fn, gen, input, el, genOperation = "next") {
try {
const { output, done } = getNextOutput(gen, input, genOperation);
if (done) return toPromise(output);
const isList = Array.isArray(output);
const commandsList = toArray(output);
return processCommands(context, interpreters, fn, commandsList, el)
.then(results => {
const unwrappedResults = unwrapResults(isList, results);
el.step++;
return run(
context,
interpreters,
fn,
gen,
unwrappedResults,
el,
"next"
);
})
.catch(e => {
el.step++;
return run(context, interpreters, fn, gen, e, el, "throw");
});
} catch (e) {
return Promise.reject(e);
}
}
function newExecutionLog() {
return {
step: 0
};
}
function unwrapResults(isList, results) {
return isList ? results : results[0];
}
function getNextOutput(fn, input, op) {
const { value: output, done } = fn[op](input);
return { output, done };
}
function processCommands(context, interpreters, fn, commands, el) {
try {
const pc = (c, index) =>
processCommand(context, interpreters, fn, c, el, index);
const promises = commands.map(pc);
return Promise.all(promises);
} catch (e) {
/* istanbul ignore next */
return Promise.reject(e);
}
}
function processCommand(context, interpreters, fn, command, el, index) {
const start = Date.now();
onCommand({
command,
fn,
start,
index,
step: el.step,
context
});
let result;
try {
const interpreter = interpreters[command.type];
Iif (!interpreter)
return Promise.reject(
new Error(`Interpreter of type "${command.type}" is not registered.`)
);
result = interpreter(command, { call, context, interpreters });
} catch (e) {
result = Promise.reject(e);
}
return toPromise(result)
.then(r => {
Eif (!context.onCommandComplete) return r;
const end = Date.now();
onCommandComplete({
success: true,
context,
command,
fn,
step: el.step,
index,
result: r,
start,
end
});
return r;
})
.catch(e => {
onError(e, context);
if (!context.onCommandComplete) return Promise.reject(e);
const end = Date.now();
onCommandComplete({
success: false,
context,
command,
fn,
step: el.step,
index,
result: e,
start,
end
});
return Promise.reject(e);
});
}
function onCommand({ command, index, step, context, start, fn }) {
Eif (!context.onCommand || typeof context.onCommand !== "function") return;
const r = {
command,
start,
index,
step,
context,
fn
};
delay(() => context.onCommand(r));
}
function onError(error, context) {
if (!context.onError) return;
if (error.eadReported) return;
// tag error to prevent multiple reports as the error bubbles up
error.eadReported = true;
error.context = context;
delay(() => context.onError(error));
}
function onCommandComplete({
success,
command,
index,
step,
result,
context,
start,
end,
fn
}) {
const r = {
success,
command,
latency: end - start,
start,
end,
index,
step,
result,
context,
fn
};
delay(() => context.onCommandComplete(r));
}
function onCall({ args, fn, context }) {
Eif (!context.onCall || typeof context.onCall !== "function") return;
const r = {
args,
fn,
context
};
delay(() => context.onCall(r));
}
function onCallComplete({ success, result, fn, context, start, end, latency }) {
const r = {
success,
fn,
context,
end,
latency,
result,
start
};
delay(() => context.onCallComplete(r));
}
function buildFunctions(context, interpreters, functions) {
let promiseFunctions = {};
for (let i in functions) {
promiseFunctions[i] = function(...args) {
const localContext = Object.assign({ name: i }, context);
return call(localContext, interpreters, functions[i], ...args);
};
}
return promiseFunctions;
}
module.exports = {
call,
buildFunctions
};
|