Add error handling and retries for loading/pinning

lib/ipfs-pinner.js

@@ -32,7 +32,7 @@ class IpfsPinner {
     for (const contract of contracts) {
       debug(`Pinning data from ${contract.constructor.name}...`);
       const itemCount = await contract.count;
-      debug('Item count:', itemCount);
+      debug(`${contract.constructor.name} item count:`, itemCount);
       let bar;
 
       if (this.progressBars) {
@@ -68,21 +68,37 @@ class IpfsPinner {
   }
 
   async _pinAllFromContract (contract, itemCount, progressBar) {
+    const ipfsApi = this.ipfsApi;
+    const progressBars = this.progressBars;
     const ids = [...Array(itemCount).keys()].map(i => i+1);
     const cids = [];
     const batchSize = 20;
     let position = 0;
 
-    while (position < itemCount) {
-      const batchIds = ids.slice(position, position + batchSize);
-      await Promise.all(batchIds.map(async id => {
+    async function loadAndPin(id) {
+      let cid;
+
+      try {
         const data = await contract.getData(id);
         debug(`Loaded ${contract.constructor.name} #${id}`);
-        const cid = await this.ipfsApi.pin(data);
+        cid = await ipfsApi.pin(data);
         debug(`Pinned ${contract.constructor.name} #${id} at ${cid}`);
+      } catch(e) {
+        debug(`Error while trying to load an pin ${contract.constructor.name} #${id}:`)
+        debug(e);
+        debug(`\nTrying again...`);
+        loadAndPin(id);
+      } finally {
         cids.push(cid);
-        if (this.progressBars) { progressBar.increment(); }
-      }));
+        if (progressBars) { progressBar.increment(); }
+      }
+    }
+
+    while (position < itemCount) {
+      const batchIds = ids.slice(position, position + batchSize);
+
+      await Promise.all(batchIds.map(async id => loadAndPin(id)));
+
       position += batchSize;
     }