From 3269986e4281f24fc5a23de5b5d89aa5b23be0ac Mon Sep 17 00:00:00 2001
From: Jeromy <jeromyj@gmail.com>
Date: Tue, 13 Jan 2015 22:00:33 +0000
Subject: [PATCH] basic reprovider implementation

make vendor
---
 core/core.go                    |  6 ++++
 exchange/reprovide/reprovide.go | 55 +++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 exchange/reprovide/reprovide.go

diff --git a/core/core.go b/core/core.go
index 2477354f6..163b286e7 100644
--- a/core/core.go
+++ b/core/core.go
@@ -16,6 +16,7 @@ import (
 	bitswap "github.com/jbenet/go-ipfs/exchange/bitswap"
 	bsnet "github.com/jbenet/go-ipfs/exchange/bitswap/network"
 	offline "github.com/jbenet/go-ipfs/exchange/offline"
+	rp "github.com/jbenet/go-ipfs/exchange/reprovide"
 	mount "github.com/jbenet/go-ipfs/fuse/mount"
 	merkledag "github.com/jbenet/go-ipfs/merkledag"
 	namesys "github.com/jbenet/go-ipfs/namesys"
@@ -79,6 +80,7 @@ type IpfsNode struct {
 	Exchange    exchange.Interface  // the block exchange + strategy (bitswap)
 	Namesys     namesys.NameSystem  // the name system, resolves paths to hashes
 	Diagnostics *diag.Diagnostics   // the diagnostics service
+	Reprovider  *rp.Reprovider      // the value reprovider system
 
 	ctxgroup.ContextGroup
 
@@ -183,6 +185,10 @@ func Standard(cfg *config.Config, online bool) ConfigOption {
 			if err := n.StartOnlineServices(); err != nil {
 				return nil, err // debugerror.Wraps.
 			}
+
+			// Start up reprovider system
+			n.Reprovider = rp.NewReprovider(n.Routing, n.Blockstore)
+			go n.Reprovider.Run(ctx)
 		} else {
 			n.Exchange = offline.Exchange(n.Blockstore)
 		}
diff --git a/exchange/reprovide/reprovide.go b/exchange/reprovide/reprovide.go
new file mode 100644
index 000000000..e6c15f621
--- /dev/null
+++ b/exchange/reprovide/reprovide.go
@@ -0,0 +1,55 @@
+package reprovide
+
+import (
+	"time"
+
+	context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
+
+	blocks "github.com/jbenet/go-ipfs/blocks/blockstore"
+	routing "github.com/jbenet/go-ipfs/routing"
+	"github.com/jbenet/go-ipfs/util/eventlog"
+)
+
+var log = eventlog.Logger("reprovider")
+
+type Reprovider struct {
+	// The routing system to provide values through
+	rsys routing.IpfsRouting
+
+	// The backing store for blocks to be provided
+	bstore blocks.Blockstore
+}
+
+func NewReprovider(rsys routing.IpfsRouting, bstore blocks.Blockstore) *Reprovider {
+	return &Reprovider{
+		rsys:   rsys,
+		bstore: bstore,
+	}
+}
+
+func (rp *Reprovider) Run(ctx context.Context) {
+	after := time.After(0)
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-after:
+			rp.reprovide(ctx)
+			after = time.After(time.Hour * 12)
+		}
+	}
+}
+
+func (rp *Reprovider) reprovide(ctx context.Context) {
+	keychan, err := rp.bstore.AllKeysChan(ctx, 0, 1<<16)
+	if err != nil {
+		log.Errorf("Failed to get key chan from blockstore: %s", err)
+		return
+	}
+	for k := range keychan {
+		err := rp.rsys.Provide(ctx, k)
+		if err != nil {
+			log.Errorf("Failed to provide key: %s, %s", k, err)
+		}
+	}
+}