move more rpc functionality into modules

lib/commands/pin-rpc.js

@@ -8,6 +8,8 @@ const Pinning = module.exports;
 const Nacl = require("tweetnacl/nacl-fast");
 const Util = require("../common-util");
 const nThen = require("nthen");
+const Saferphore = require("saferphore");
+const Pinned = require('../../scripts/pinned');
 
 //const escapeKeyCharacters = Util.escapeKeyCharacters;
 const unescapeKeyCharacters = Util.unescapeKeyCharacters;
@@ -397,3 +399,66 @@ Pinning.getFileSize = function (Env, channel, _cb) {
     });
 };
 
+/*  accepts a list, and returns a sublist of channel or file ids which seem
+    to have been deleted from the server (file size 0)
+
+    we might consider that we should only say a file is gone if fs.stat returns
+    ENOENT, but for now it's simplest to just rely on getFileSize...
+*/
+Pinning.getDeletedPads = function (Env, channels, cb) {
+    if (!Array.isArray(channels)) { return cb('INVALID_LIST'); }
+    var L = channels.length;
+
+    var sem = Saferphore.create(10);
+    var absentees = [];
+
+    var job = function (channel, wait) {
+        return function (give) {
+            Pinning.getFileSize(Env, channel, wait(give(function (e, size) {
+                if (e) { return; }
+                if (size === 0) { absentees.push(channel); }
+            })));
+        };
+    };
+
+    nThen(function (w) {
+        for (var i = 0; i < L; i++) {
+            sem.take(job(channels[i], w));
+        }
+    }).nThen(function () {
+        cb(void 0, absentees);
+    });
+};
+
+// inform that the
+Pinning.loadChannelPins = function (Env) {
+    Pinned.load(function (err, data) {
+        if (err) {
+            Env.Log.error("LOAD_CHANNEL_PINS", err);
+
+            // FIXME not sure what should be done here instead
+            Env.pinnedPads = {};
+            Env.evPinnedPadsReady.fire();
+            return;
+        }
+
+
+        Env.pinnedPads = data;
+        Env.evPinnedPadsReady.fire();
+    }, {
+        pinPath: Env.paths.pin,
+    });
+};
+
+Pinning.isChannelPinned = function (Env, channel, cb) {
+    Env.evPinnedPadsReady.reg(() => {
+        if (Env.pinnedPads[channel] && Object.keys(Env.pinnedPads[channel]).length) {
+            cb(true);
+        } else {
+            delete Env.pinnedPads[channel];
+            cb(false);
+        }
+    });
+};
+
+