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Work around gun still sometimes returning undefined for a "once" case - this time was superpeer failing

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This commit is contained in:
Mitra Ardron 2018-07-23 13:20:47 -07:00
parent c0d233dd2f
commit fc44dd8191
1 changed files with 9 additions and 9 deletions
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18
TransportGUN.js
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@ -25,13 +25,15 @@ let defaultoptions = {
// TODO-GUN - copy example from systemctl here
/*
WORKING AROUND GUN WEIRNESS/SUBOPTIMAL (of course, whats weird/sub-optimal to me, might be ideal to someone else)
WORKING AROUND GUN WEIRNESS/SUBOPTIMAL (of course, whats weird/sub-optimal to me, might be ideal to someone else) - search the code to see where worked around
WORKAROUND-GUN-UNDERSCORE .once() and possibly .on() send an extra GUN internal field "_" which needs filtering. Reported and hopefully will get fixed
.once behaves differently on node or the browser - this is a bug https://github.com/amark/gun/issues/586 and for now this code doesnt work on Node
WORKAROUND-GUN-CURRENT: .once() and .on() deliver existing values as well as changes, reported & hopefully will get way to find just new ones.
WORKAROUND-GUN-DELETE: There is no way to delete an item, setting it to null is recorded and is by convention a deletion. BUT the field will still show up in .once and .on,
WORKAROUND-GUN-PROMISES: GUN is not promisified, there is only one place we care, and that is .once (since .on is called multiple times).
WORKAROUND-GUN-ERRORS: GUN does an unhelpful job with errors, for example returning undefined when it cant find something (e.g. if connection to superpeer is down),
for now just throw an error on undefined
Errors and Promises: Note that GUN's use of promises is seriously uexpected (aka weird), see https://gun.eco/docs/SEA#errors
instead of using .reject or throwing an error at async it puts the error in SEA.err, so how that works in async parallel context is anyone's guess
*/
@ -60,11 +62,10 @@ class TransportGUN extends Transport {
/*
TODO-GUN need to determine what a "rooted" Url is in gun, is it specific to a superpeer for example
Utility function to get Gun object for this URL (note this isn't async)
url: URL string to find list of of form [gun|dweb]:/gun/<database>/<table>[/<key] but could be arbitrary gun path
url: URL string or structure, to find list of of form [gun|dweb]:/gun/<database>/<table>[/<key] but could be arbitrary gun path
resolves: Gun a connection to use for get's etc, undefined if fails
*/
if (typeof url === "string")
url = Url.parse(url);
url = Url.parse(url); // Accept string or Url structure
let patharray = url.pathname.split('/'); //[ 'gun', database, table ] but could be arbitrary length path
patharray.shift(); // Loose leading ""
patharray.shift(); // Loose "gun"
@ -112,12 +113,16 @@ class TransportGUN extends Transport {
return this.status;
}
// ===== DATA ======
async p_rawfetch(url, {verbose=false}={}) {
url = Url.parse(url); // Accept url as string or object
let g = this.connection(url, verbose); // Goes all the way to the key
let val = await this._p_once(g);
if (!val) throw new errors.TransportError("GUN unable to retrieve: "+url.href); // WORKAROUND-GUN-ERRORS - gun doesnt throw errors when it cant find something
return typeof val === "string" ? JSON.parse(val) : val; // This looks like it is sync (see same code on p_get and p_rawfetch)
}
// ===== LISTS ========
// noinspection JSCheckFunctionSignatures
@ -257,11 +262,6 @@ class TransportGUN extends Transport {
}
}
async p_rawfetch(url, {verbose=false}={}) {
let g = this.connection(url, verbose); // Goes all the way to the key
let val = await this._p_once(g);
return typeof val === "string" ? JSON.parse(val) : val; // This looks like it is sync (see same code on p_get and p_rawfetch)
}
async p_get(url, keys, {verbose=false}={}) {
let table = this.connection(url, verbose);
if (Array.isArray(keys)) {