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Swap to async/await rather than promise chains 

Since we do in fact support coroutines!
This commit is contained in:
Kegan Dougal 2017-01-19 16:40:54 +00:00
parent 81d437ac1e
commit bf887e82fe
1 changed files with 65 additions and 96 deletions
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161
src/vector/rageshake.js
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@ -166,7 +166,7 @@ class IndexedDBLogStore {
* when the log file was created (the log ID). The objects have said log ID in an "id" field and "lines" which is a
* big string with all the new-line delimited logs.
*/
consume(clearAll) {
async consume(clearAll) {
const MAX_LOG_SIZE = 1024 * 1024 * 50; // 50 MB
const db = this.db;
@ -223,65 +223,36 @@ class IndexedDBLogStore {
});
}
// Ideally we'd just use coroutines and a for loop but riot-web doesn't support async/await so instead
// recursively fetch logs up to the given threshold. We can't cheat and fetch all the logs
// from all time, but we may OOM if we do so.
// Returns: Promise<Object[]> : Each object having 'id' and 'lines'. Same ordering as logIds.
function fetchLogsToThreshold(logIds, threshold, logs) {
// Base case: check log size and return if bigger than threshold
let size = 0;
logs.forEach((l) => {
size += l.lines.length;
let allLogIds = await fetchLogIds();
let removeLogIds = [];
let logs = [];
let size = 0;
for (let i = 0; i < allLogIds.length; i++) {
let lines = await fetchLogs(allLogIds[i]);
logs.push({
lines: lines,
id: allLogIds[i],
});
if (size > threshold) {
return Promise.resolve(logs);
size += lines.length;
if (size > MAX_LOG_SIZE) {
// the remaining log IDs should be removed. If we go out of bounds this is just []
removeLogIds = allLogIds.slice(i + 1);
break;
}
// fetch logs for the first element
let logId = logIds.shift();
if (!logId) {
// no more entries
return Promise.resolve(logs);
}
return fetchLogs(logId).then((lines) => {
// add result to logs
logs.push({
lines: lines,
id: logId,
});
// recurse with the next log ID. TODO: Stack overflow risk?
return fetchLogsToThreshold(logIds, threshold, logs);
})
}
let allLogIds = [];
return fetchLogIds().then((logIds) => {
allLogIds = logIds.map((id) => id); // deep copy array as we'll modify it when fetching logs
return fetchLogsToThreshold(logIds, MAX_LOG_SIZE, []);
}).then((logs) => {
// Remove all logs that are beyond the threshold (not in logs), or the entire logs if clearAll was set.
let removeLogIds = allLogIds;
if (!clearAll) {
removeLogIds = removeLogIds.filter((id) => {
for (let i = 0; i < logs.length; i++) {
if (logs[i].id === id) {
return false; // do not remove logs that we're about to return to the caller.
}
}
return true;
});
}
if (removeLogIds.length > 0) {
console.log("Removing logs: ", removeLogIds);
// Don't promise chain this because it's non-fatal if we can't clean up logs.
Promise.all(removeLogIds.map((id) => deleteLogs(id))).then(() => {
console.log(`Removed ${removeLogIds.length} old logs.`);
}, (err) => {
console.error(err);
})
}
return logs;
});
if (clearAll) {
removeLogIds = allLogIds;
}
if (removeLogIds.length > 0) {
console.log("Removing logs: ", removeLogIds);
// Don't await this because it's non-fatal if we can't clean up logs.
Promise.all(removeLogIds.map((id) => deleteLogs(id))).then(() => {
console.log(`Removed ${removeLogIds.length} old logs.`);
}, (err) => {
console.error(err);
})
}console.log("async consumeeeee");
return logs;
}
_generateLogEntry(lines) {
@ -350,22 +321,22 @@ module.exports = {
* Force-flush the logs to storage.
* @return {Promise} Resolved when the logs have been flushed.
*/
flush: function() {
flush: async function() {
if (!store) {
return Promise.resolve();
return;
}
return store.flush();
await store.flush();
},
/**
* Clean up old logs.
* @return Promise Resolves if cleaned logs.
*/
cleanup: function() {
cleanup: async function() {
if (!store) {
return Promise.resolve();
return;
}
return store.consume(false);
await store.consume(false);
},
/**
@ -373,45 +344,43 @@ module.exports = {
* @param {string} userText Any additional user input.
* @return {Promise} Resolved when the bug report is sent.
*/
sendBugReport: function(userText) {
sendBugReport: async function(userText) {
if (!logger) {
return Promise.reject(new Error("No console logger, did you forget to call init()?"));
throw new Error("No console logger, did you forget to call init()?");
}
// If in incognito mode, store is null, but we still want bug report sending to work going off
// the in-memory console logs.
let promise = Promise.resolve([]);
let logs = [];
if (store) {
promise = store.consume(false); // TODO Swap to true to remove all logs
logs = await store.consume(false);
}
return promise.then((logs) => {
// and add the most recent console logs which won't be in the store yet.
const consoleLogs = logger.flush(); // remove logs from console
const currentId = store ? store.id : "-";
logs.unshift({
lines: consoleLogs,
id: currentId,
});
return new Promise((resolve, reject) => {
request({
method: "POST",
url: "http://localhost:1337",
body: {
logs: logs,
text: userText || "User did not supply any additional text.",
},
json: true,
}, (err, res) => {
if (err) {
reject(err);
return;
}
if (res.status < 200 || res.status >= 400) {
reject(new Error(`HTTP ${res.status}`));
return;
}
resolve();
})
});
// and add the most recent console logs which won't be in the store yet.
const consoleLogs = logger.flush(); // remove logs from console
const currentId = store ? store.id : "-";
logs.unshift({
lines: consoleLogs,
id: currentId,
});
await new Promise((resolve, reject) => {
request({
method: "POST",
url: "http://localhost:1337",
body: {
logs: logs,
text: userText || "User did not supply any additional text.",
},
json: true,
}, (err, res) => {
if (err) {
reject(err);
return;
}
if (res.status < 200 || res.status >= 400) {
reject(new Error(`HTTP ${res.status}`));
return;
}
resolve();
})
});
}
};