syphonx-core
Version:
SyphonX is a template-driven solution for extracting data from HTML in a highly efficient way. It combines the power of jQuery, Regular Expressions, and Javascript into a declarative template-driven format that extracts and reshapes HTML data into JSON.
195 lines • 145 kB
JavaScript
import { attempt, evaluateFormula, sleep, unwrap } from "./lib/index.js";
import { isFormula, merge, parseUrl, Timer } from "./package/lib/index.js";
import { flattenTemplateActions } from "./package/utilities.js";
const retryableErrorCodes = [
"ERR_TARGET_CLOSED",
"ERR_NAVIGATION",
"ERR_TIMEOUT"
];
export async function host({ maxYields = 1000, retries, retryDelay, ...options }) {
if (!options.template)
throw new Error("template not specified");
let url = options.url || options.template.url;
if (!url || typeof url !== "string")
throw new Error("url not specified");
if (!options.onNavigate)
throw new Error("onNavigate not defined");
if (!options.onExtract)
throw new Error("onExtract not defined");
const timer = new Timer();
const params = merge(options.template.params, options.params);
const timeout = typeof options.template.timeout === "number" ? options.template.timeout * 1000 : undefined;
const waitUntil = options.template.waitUntil;
url = expandTemplateUrl(url, params);
const originalUrl = url;
const { domain, origin } = parseUrl(url);
let state = {
...options.template,
url,
params,
vars: {},
debug: options.debug || options.template.debug
};
const actions = flattenTemplateActions(options.template.actions);
state.vars.__metrics = {
navigate: 0,
retries: 0,
actions: actions.length
};
const attemptOptions = {
retries,
retryDelay
};
let lastNavigationResult = {};
const navigationTimer = new Timer();
await attempt(async () => {
lastNavigationResult = await options.onNavigate({ url: url, timeout, waitUntil });
}, attemptRetryable, attemptOptions);
state.vars.__metrics.navigate += navigationTimer.elapsed();
state.vars.__status = lastNavigationResult?.status;
await attempt(async () => {
state = await options.onExtract(state, script || global.script);
}, attemptRetryable, attemptOptions);
let i = 0;
while (state.yield && i++ < maxYields) {
if (state.yield.params?.goback && options.onGoback) {
const obj = {
timeout: state.yield.params.timeout || timeout,
waitUntil: state.yield.params.waitUntil || waitUntil
};
const gobackTimer = new Timer();
try {
lastNavigationResult = await options.onGoback(obj);
}
catch (err) {
state.errors.push({ code: "host-error", message: `GOBACK ${err instanceof Error ? err.message : JSON.stringify(err)}`, level: 1 });
}
state.vars.__metrics.navigate += gobackTimer.elapsed();
}
else if (state.yield.params?.locators && options.onLocator) {
for (const locator of state.yield.params.locators)
if (locator.name?.startsWith("_") && locator.selector && locator.method) {
try {
state.vars[locator.name] = await options.onLocator(locator);
}
catch (err) {
state.errors.push({ code: "host-error", message: `LOCATOR ${JSON.stringify(locator)} ${err instanceof Error ? err.message : JSON.stringify(err)}`, level: 1 });
state.vars[locator.name] = null;
}
}
}
else if (state.yield.params?.navigate && options.onNavigate) {
if (state.yield.params.navigate.url) {
state.url = state.yield.params.navigate.url;
const obj = {
...state.yield.params.navigate,
timeout: state.yield.params.timeout || timeout,
waitUntil: state.yield.params.waitUntil || waitUntil
};
const renavigationTimer = new Timer();
await attempt(async () => {
lastNavigationResult = await options.onNavigate(obj);
}, attemptRetryable, attemptOptions);
state.vars.__metrics.navigate += renavigationTimer.elapsed();
}
}
else if (state.yield.params?.reload && options.onReload) {
const obj = {
timeout: state.yield.params.timeout || timeout,
waitUntil: state.yield.params.waitUntil || waitUntil
};
const reloadTimer = new Timer();
try {
lastNavigationResult = await options.onReload(obj);
}
catch (err) {
state.errors.push({ code: "host-error", message: `RELOAD ${err instanceof Error ? err.message : JSON.stringify(err)}`, level: 1 });
}
state.vars.__metrics.navigate += reloadTimer.elapsed();
}
else if (state.yield.params?.screenshot && options.onScreenshot) {
try {
await options.onScreenshot(state.yield.params.screenshot);
}
catch (err) {
state.errors.push({ code: "host-error", message: `SCREENSHOT ${state.yield.params.screenshot} ${err instanceof Error ? err.message : JSON.stringify(err)}`, level: 1 });
}
}
else if (state.yield.params?.waitUntil && options.onYield) {
await sleep(1000);
try {
await options.onYield(state.yield.params);
}
catch (err) {
state.errors.push({ code: "host-error", message: `YIELD ${JSON.stringify(state.yield.params)} ${err instanceof Error ? err.message : JSON.stringify(err)}`, level: 1 });
}
}
else {
await sleep(1000);
}
await attempt(async () => {
state = await options.onExtract(state, script || global.script);
}, attemptRetryable, attemptOptions);
}
let html = "";
if (options.extractHtml && options.onHtml)
html = await options.onHtml();
const metrics = state.vars.__metrics;
metrics.elapsed = timer.elapsed();
metrics.errors = state.errors?.length ?? 0;
return {
...state,
ok: state.errors ? state.errors.length === 0 : true,
status: lastNavigationResult?.status,
html,
originalUrl,
domain,
origin,
metrics,
data: options.unwrap ? unwrap(state.data) : state.data,
online: true
};
function attemptRetryable(err) {
const code = createErrorCode(err);
if (retryableErrorCodes.includes(code)) {
state.vars.__metrics.retries += 1;
return true;
}
else {
return false;
}
}
}
export function expandTemplateUrl(url, params) {
if (isFormula(url))
url = encodeURI(evaluateFormula(url.slice(1, -1), { params }));
return url;
}
export async function invokeAsyncMethod(obj, method, args = []) {
const fn = obj[method];
if (typeof fn === "function") {
const result = await fn.call(obj, ...args);
return result;
}
}
function createErrorCode(err) {
let message = "";
if (err instanceof Error)
message = err.message;
else if (typeof err === "string")
message = err;
else
message = JSON.stringify(err);
const [code] = message.match(/ERR_[A-Z_]*/) || [];
if (code)
return code;
else if (message.includes("Execution context was destroyed") || message.includes("Target closed") || message.includes("document.body is null"))
return "ERR_TARGET_CLOSED";
else if (message.toLowerCase().includes("timeout"))
return "ERR_TIMEOUT";
else if (message.toLowerCase().includes("navigation"))
return "ERR_NAVIGATION";
else
return "ERR_UNKNOWN";
}
export const script = "(function (obj) {\n/*! jQuery v3.7.1 -ajax,-ajax/jsonp,-ajax/load,-ajax/script,-ajax/var/location,-ajax/var/nonce,-ajax/var/rquery,-ajax/xhr,-manipulation/_evalUrl,-deprecated/ajax-event-alias,-effects,-effects/animatedSelector,-effects/Tween | (c) OpenJS Foundation and other contributors | jquery.org/license */\n!function(e,t){\"use strict\";\"object\"==typeof module&&\"object\"==typeof module.exports?module.exports=e.document?t(e,!0):function(e){if(!e.document)throw new Error(\"jQuery requires a window with a document\");return t(e)}:t(e)}(\"undefined\"!=typeof window?window:this,function(ie,e){\"use strict\";var oe=[],r=Object.getPrototypeOf,ae=oe.slice,g=oe.flat?function(e){return oe.flat.call(e)}:function(e){return oe.concat.apply([],e)},s=oe.push,se=oe.indexOf,n={},i=n.toString,ue=n.hasOwnProperty,o=ue.toString,a=o.call(Object),le={},v=function(e){return\"function\"==typeof e&&\"number\"!=typeof e.nodeType&&\"function\"!=typeof e.item},y=function(e){return 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