[node] Store datasets locally when sales asks for it

codex/node.nim

@@ -168,6 +168,39 @@ proc store*(
 
   return manifest.cid.success
 
+proc store(node: CodexNodeRef, cid: Cid): Future[?!void] {.async.}
+
+proc store(node: CodexNodeRef, cids: seq[Cid]): Future[?!void] {.async.} =
+  ## Retrieves multiple datasets from the network, and stores them locally
+
+  let batches = max(1, cids.len div FetchBatch)
+  for batch in cids.distribute(batches, true):
+    let results = await allFinished(cids.mapIt(node.store(it)))
+    for future in results:
+      let res = await future
+      if res.isFailure:
+        return failure res.error
+
+  return success()
+
+proc store(node: CodexNodeRef, cid: Cid): Future[?!void] {.async.} =
+  ## Retrieves dataset from the network, and stores it locally
+
+  if node.blockstore.hasBlock(cid):
+    return success()
+
+  without blk =? await node.blockstore.getBlock(cid):
+    return failure newException(CodexError, "Unable to retrieve block " & $cid)
+
+  if not (await node.blockstore.putBlock(blk)):
+    return failure newException(CodexError, "Unable to store block " & $cid)
+
+  if manifest =? Manifest.decode(blk.data, blk.cid):
+
+    let res = await node.store(manifest.blocks)
+    if res.isFailure:
+      return failure res.error
+
 proc requestStorage*(self: CodexNodeRef,
                      cid: Cid,
                      duration: UInt256,
@@ -279,11 +312,8 @@ proc start*(node: CodexNodeRef) {.async.} =
     await node.discovery.start()
 
   if contracts =? node.contracts:
-    contracts.sales.retrieve = proc(cid: string) {.async.} =
+    contracts.sales.store = proc(cid: string) {.async.} =
-      let stream = (await node.retrieve(Cid.init(cid).tryGet())).tryGet()
+      (await node.store(Cid.init(cid).tryGet())).tryGet()
-      while not stream.atEof():
-        var buffer: array[4096, byte]
-        discard await readOnce(stream, addr buffer[0], buffer.len)
     contracts.sales.prove = proc(cid: string): Future[seq[byte]] {.async.} =
       return @[42'u8] # TODO: generate actual proof
     await contracts.start()

codex/sales.nim

@@ -15,7 +15,7 @@ type
     clock: Clock
     subscription: ?Subscription
     available*: seq[Availability]
-    retrieve: ?Retrieve
+    store: ?Store
     prove: ?Prove
     onSale: ?OnSale
   Availability* = object
@@ -33,7 +33,7 @@ type
     running: ?Future[void]
     waiting: ?Future[void]
     finished: bool
-  Retrieve = proc(cid: string): Future[void] {.gcsafe, upraises: [].}
+  Store = proc(cid: string): Future[void] {.gcsafe, upraises: [].}
   Prove = proc(cid: string): Future[seq[byte]] {.gcsafe, upraises: [].}
   OnSale = proc(availability: Availability, request: StorageRequest) {.gcsafe, upraises: [].}
 
@@ -51,8 +51,8 @@ proc init*(_: type Availability,
   doAssert randomBytes(id) == 32
   Availability(id: id, size: size, duration: duration, minPrice: minPrice)
 
-proc `retrieve=`*(sales: Sales, retrieve: Retrieve) =
+proc `store=`*(sales: Sales, store: Store) =
-  sales.retrieve = some retrieve
+  sales.store = some store
 
 proc `prove=`*(sales: Sales, prove: Prove) =
   sales.prove = some prove
@@ -122,8 +122,8 @@ proc start(agent: SalesAgent) {.async.} =
     let market = sales.market
     let availability = agent.availability
 
-    without retrieve =? sales.retrieve:
+    without store =? sales.store:
-      raiseAssert "retrieve proc not set"
+      raiseAssert "store proc not set"
 
     without prove =? sales.prove:
       raiseAssert "prove proc not set"
@@ -139,7 +139,7 @@ proc start(agent: SalesAgent) {.async.} =
 
     agent.waiting = some agent.waitForExpiry()
 
-    await retrieve(request.content.cid)
+    await store(request.content.cid)
     let proof = await prove(request.content.cid)
     await market.fulfillRequest(request.id, proof)
   except CancelledError:

tests/codex/testsales.nim

@@ -32,7 +32,7 @@ suite "Sales":
     market = MockMarket.new()
     clock = MockClock.new()
     sales = Sales.new(market, clock)
-    sales.retrieve = proc(_: string) {.async.} = discard
+    sales.store = proc(_: string) {.async.} = discard
     sales.prove = proc(_: string): Future[seq[byte]] {.async.} = return proof
     await sales.start()
     request.expiry = (clock.now() + 42).u256
@@ -74,16 +74,16 @@ suite "Sales":
     discard await market.requestStorage(tooBig)
     check sales.available == @[availability]
 
-  test "retrieves data":
+  test "retrieves and stores data locally":
-    var retrievingCid: string
+    var storingCid: string
-    sales.retrieve = proc(cid: string) {.async.} = retrievingCid = cid
+    sales.store = proc(cid: string) {.async.} = storingCid = cid
     sales.add(availability)
     discard await market.requestStorage(request)
-    check retrievingCid == request.content.cid
+    check storingCid == request.content.cid
 
   test "makes storage available again when data retrieval fails":
     let error = newException(IOError, "data retrieval failed")
-    sales.retrieve = proc(cid: string) {.async.} = raise error
+    sales.store = proc(cid: string) {.async.} = raise error
     sales.add(availability)
     discard await market.requestStorage(request)
     check sales.available == @[availability]
@@ -116,14 +116,14 @@ suite "Sales":
 
   test "makes storage available again when other host fulfills request":
     let otherHost = Address.example
-    sales.retrieve = proc(_: string) {.async.} = await sleepAsync(1.hours)
+    sales.store = proc(_: string) {.async.} = await sleepAsync(1.hours)
     sales.add(availability)
     discard await market.requestStorage(request)
     market.fulfillRequest(request.id, proof, otherHost)
     check sales.available == @[availability]
 
   test "makes storage available again when request expires":
-    sales.retrieve = proc(_: string) {.async.} = await sleepAsync(1.hours)
+    sales.store = proc(_: string) {.async.} = await sleepAsync(1.hours)
     sales.add(availability)
     discard await market.requestStorage(request)
     clock.set(request.expiry.truncate(int64))