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index.js
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index.js
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import https from "https";
import isEmpty from "lodash.isempty";
import Debug from "debug";
import delay from "delay";
import Hyperid from "hyperid";
import MakeFetch from "make-fetch-happen";
import os from "os";
import pRetry from "p-retry";
import pThrottle from "p-throttle";
import PQueue from "p-queue";
import BuzzAPIError from "./buzzApiError.js";
const debug = Debug("buzzapi");
const hyperid = Hyperid({ fixedLength: true, urlSafe: true });
https.globalAgent.maxCachedSessions = 0;
const BuzzAPI = function (config) {
const that = this;
const queue = new PQueue({ concurrency: 20 });
this.options = {
...(config.apiUser? {api_app_id: config.apiUser}: null),
...(config.apiPassword? {api_app_password: Buffer.from(config.apiPassword).toString("base64")}: null),
api_request_mode: config.sync ? "sync" : "async",
api_receive_timeout: config.api_receive_timeout || 900000,
};
const server = config.server || "https://api.gatech.edu";
const throttle = pThrottle({limit: 333, interval: 1000})
const fetch = throttle(
MakeFetch.defaults({
agent: https.globalAgent,
})
);
const unresolved = {};
this.post = function (resource, operation, data, opts) {
debug("Options: " + JSON.stringify(that.options));
return queue.add(() => doPost(resource, operation, data, opts));
};
const doPost = (resource, operation, data, opts) =>
new Promise((res, rej) => {
const handle =
data.api_client_request_handle ||
`${process.pid}@${os.hostname()}-${hyperid()}`;
const myOpts = {
method: "POST",
body: JSON.stringify({
...that.options,
...data,
api_client_request_handle: handle,
...(opts && opts.paged ? { api_paging_cursor: "START" } : null),
}),
headers: { "Content-Type": "application/json" },
};
debug("Requesting %s", JSON.stringify(myOpts));
const url = `${server}/apiv3/${resource}/${operation}`;
return pRetry(() => fetch(url, myOpts), {
retries: 5,
randomize: true,
}).then((response) => {
if (!response.ok) {
return response.text().then((body) => {
try {
const parsed = JSON.parse(body);
body = parsed;
} catch (err) {}
return rej(
new BuzzAPIError(
`${response.status}: ${response.statusText}`,
body.api_error_info,
`${response.status}: ${response.statusText}`,
body.api_request_messageid,
{ url, options: myOpts }
)
);
});
}
return response.json().then(async (json) => {
if (json.api_error_info) {
const error = new BuzzAPIError(
new Error(),
json.api_error_info,
json,
json.api_request_messageid,
{ url, options: myOpts }
);
return rej(error);
} else if (that.options.api_request_mode === "sync") {
const resultData = await getPages(json, resource, operation, data);
debug("Sync was set, returning the result");
return res(resultData);
} else {
debug("Got messageId: %s for %s", json.api_result_data, handle);
unresolved[json.api_result_data] = {
resolve: res,
reject: rej,
initTime: new Date(),
resource,
operation,
data,
};
that.options.ticket = json.api_app_ticket;
return getResult();
}
});
});
});
const getPages = function (buzzResponse, resource, operation, data) {
const unwrapped = buzzResponse.api_result_data.api_result_data
? buzzResponse.api_result_data
: buzzResponse;
if (
unwrapped.api_paging_next_cursor &&
!unwrapped.api_result_is_last_page
) {
debug(
`Fetching more pages with cursor: ${unwrapped.api_paging_next_cursor}`
);
return doPost(resource, operation, {
...data,
api_paging_cursor: unwrapped.api_paging_next_cursor,
}).then((nextPage) => unwrapped.api_result_data.concat(nextPage));
}
return Promise.resolve(unwrapped.api_result_data);
};
const resolve = function (messageId, result) {
debug("size: %s, pending: %s", queue.size, queue.pending);
const message = unresolved[messageId];
delete unresolved[messageId];
return getPages(
result,
message.resource,
message.operation,
message.data,
message.myOpts
)
.then((pages) => message.resolve(pages))
.catch((err) => message.reject(err));
};
const reject = function (messageId, err) {
debug("size: %s, pending: %s", queue.size, queue.pending);
const message = unresolved[messageId];
delete unresolved[messageId];
return message.reject(err);
};
const cleanupExpired = function () {
Object.keys(unresolved).forEach((messageId) => {
if (
new Date() - unresolved[messageId].initTime >
that.options.api_receive_timeout
) {
const err = new Error("Request timed out for: " + messageId);
return reject(messageId, err);
}
});
return;
};
const scheduleRetry = function () {
return delay(Math.floor(Math.random() * 4000 + 1000)).then(() =>
getResult()
);
};
const getResult = function () {
cleanupExpired();
const messageIds = Object.keys(unresolved);
if (messageIds.length === 0) {
return new Promise((res) => res());
}
const handle = `${process.pid}@${os.hostname()}-${hyperid()}`;
debug("Asking for result of %s using handle %s", messageIds, handle);
const url = `${server}/apiv3/api.my_messages`;
const myOpts = {
method: "POST",
body: JSON.stringify({
api_operation: "read",
api_app_ticket: that.options.ticket,
api_pull_response_to: messageIds,
api_receive_timeout: 5000,
api_client_request_handle: handle,
}),
headers: { "Content-Type": "application/json" },
};
return pRetry(() => fetch(url, myOpts), {
retries: 5,
randomize: true,
}).then((response) => {
if (!response.ok) {
return scheduleRetry();
}
return response.json().then((json) => {
if (
json.api_error_info ||
(json.api_result_data && json.api_result_data.api_error_info)
) {
if (json.api_error_info) {
const message =
unresolved[json.api_error_info.api_request_messageid];
const err = new BuzzAPIError(
"BuzzApi returned error_info",
json.api_error_info,
json,
json.api_error_info.api_request_messageid,
{ url, options: myOpts }
);
debug(unresolved);
if (message) {
return reject(json.api_error_info.api_request_messageid, err);
} else {
return Promise.reject(err);
}
} else if (json.api_result_data) {
const messageId = json.api_result_data.api_request_messageid;
const err = new BuzzAPIError(
"BuzzApi returned error_info",
json.api_result_data.api_error_info,
json,
messageId,
{ url, options: myOpts }
);
return reject(messageId, err);
} else {
return Promise.reject(
new BuzzAPIError(
new Error(),
json,
json,
json.api_request_messageId,
{ url, options: myOpts }
)
);
}
} else if (isEmpty(json.api_result_data)) {
// Empty result_data here means our data isn't ready, wait 1 to 5 seconds and try again
debug("Result not ready for " + messageIds);
return scheduleRetry();
} else {
const messageId = json.api_result_data.api_request_messageid;
debug("Got result for ", messageId);
return resolve(messageId, json);
}
});
});
};
};
export default BuzzAPI;