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ISkill,
IOptions,
IFlow,
ICallbacks,
IIntermediateErrorHandler
} from './types';
import { generateID } from './utils';
import { STATUS, RETURN, START, COMPLETED, NAME } from './constants';
export function dispatch(
callbacks: ICallbacks | undefined,
skills: ISkill<any>[],
type: string,
value: any,
options: IOptions = {},
parents: (string | number)[] = [],
id?: string
) {
let callback =
!callbacks || !Array.isArray(callbacks)
? callbacks
: (err?: any, result?: any) =>
err ? callbacks[0](err) : callbacks[1](result);
let nextFlows: IFlow<any>[] = [];
const context = { ...options };
function setContext(key: string, value: any) {
context[key] = value;
}
function getContext(key: string, defaultValue: any) {
return context[key] !== undefined ? context[key] : defaultValue;
}
if (options.tracker) {
id = id || generateID();
if (options[STATUS] === RETURN) {
options.tracker({
skill: RETURN,
type,
value,
time: new Date().getTime(),
id,
parents
});
} else {
options.tracker({
skill: START,
type,
value,
time: new Date().getTime(),
id,
parents
});
}
}
function useSkill(value: any, i = 0): any {
const skill = skills[i];
function flowReturn(value: any) {
if (nextFlows.length) {
// Afterwares present, go for them
return dispatch(
callback,
nextFlows,
type,
value,
{
...context,
[STATUS]: RETURN
},
parents,
id
);
} else if (callback) {
// Finish
if (options.tracker && id) {
options.tracker({
skill: COMPLETED,
type,
value,
time: new Date().getTime(),
id,
parents
});
}
return callback(undefined, value);
}
}
function flowReset(type: string, value: any, Econ: any = {}) {
return dispatch(
callback,
skills,
type,
value,
{
...options,
...con,
[STATUS]: START
},
parents,
id
);
}
function flowRun<T>(type: string, value: any, Econ: any = {}) {
return new Promise<T>((yay, nay) => {
return dispatch(
[nay, yay],
skills,
type,
value,
{
...options,
...con,
[STATUS]: START
},
options.tracker
? [...parents, `${id}.${i}${options[STATUS] === RETURN ? '-' : ''}`]
: []
);
});
}
function flowCatch(errorHandler: IIntermediateErrorHandler) {
const originalCallback = callback || ((() => {}) as any);
callback = function newCallback(err?: any, value?: any) {
if (err) {
errorHandler(err, originalCallback);
} else if (callback) {
originalCallback(err, value);
}
};
}
if (!skill) {
return flowReturn(value);
}
const skillName = skill[NAME];
function flow(newValue: any, nextFlow: any) {
if (nextFlow) {
nextFlow[NAME] = skillName;
nextFlows = [nextFlow, ...nextFlows];
}
value = newValue || value;
return useSkill(value, i + 1);
}
flow.reset = flowReset;
flow.return = flowReturn;
flow.get = getContext;
flow.set = setContext;
flow.run = flowRun;
flow.catch = flowCatch;
if (options.tracker) {
options.tracker({
skill: skillName,
type,
value,
time: new Date().getTime(),
id: `${id}.${i}${options[STATUS] === RETURN ? '-' : ''}`,
parents
});
}
try {
if (options[STATUS] === RETURN) {
return (skill as any)(value, flow);
} else {
return skill(type, value, flow);
}
} catch (err) {
if (callback) {
return callback(err);
}
throw err;
}
}
return useSkill(value);
}
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