func handleRootPost(w http.ResponseWriter, req *http.Request, ps URLParams, cs chunks.ChunkStore) {
d.PanicIfTrue(req.Method != "POST", "Expected post method.")
params := req.URL.Query()
tokens := params["last"]
d.PanicIfTrue(len(tokens) != 1, `Expected "last" query param value`)
last := hash.Parse(tokens[0])
tokens = params["current"]
d.PanicIfTrue(len(tokens) != 1, `Expected "current" query param value`)
current := hash.Parse(tokens[0])
// Ensure that proposed new Root is present in cs
c := cs.Get(current)
d.PanicIfTrue(c.IsEmpty(), "Can't set Root to a non-present Chunk")
// Ensure that proposed new Root is a Map and, if it has anything in it, that it's <String, <RefCommit>>
v := types.DecodeValue(c, nil)
d.PanicIfTrue(v.Type().Kind() != types.MapKind, "Root of a Database must be a Map")
m := v.(types.Map)
if !m.Empty() && !isMapOfStringToRefOfCommit(m) {
panic(d.Wrap(fmt.Errorf("Root of a Database must be a Map<String, Ref<Commit>>, not %s", m.Type().Describe())))
}
if !cs.UpdateRoot(current, last) {
w.WriteHeader(http.StatusConflict)
return
}
}
func TestWriteValue(t *testing.T) {
assert := assert.New(t)
factory := chunks.NewMemoryStoreFactory()
defer factory.Shutter()
router = setupWebServer(factory)
defer func() { router = nil }()
testString := "Now, what?"
authKey = "anauthkeyvalue"
w := httptest.NewRecorder()
r, err := newRequest("GET", dbName+constants.RootPath, nil)
assert.NoError(err)
router.ServeHTTP(w, r)
lastRoot := w.Body
assert.Equal(http.StatusOK, w.Code)
tval := types.Bool(true)
wval := types.String(testString)
chunk1 := types.EncodeValue(tval, nil)
chunk2 := types.EncodeValue(wval, nil)
refList := types.NewList(types.NewRef(tval), types.NewRef(wval))
chunk3 := types.EncodeValue(refList, nil)
body := &bytes.Buffer{}
// we would use this func, but it's private so use next line instead: serializeHints(body, map[ref.Ref]struct{}{hint: struct{}{}})
err = binary.Write(body, binary.BigEndian, uint32(0))
assert.NoError(err)
chunks.Serialize(chunk1, body)
chunks.Serialize(chunk2, body)
chunks.Serialize(chunk3, body)
w = httptest.NewRecorder()
r, err = newRequest("POST", dbName+constants.WriteValuePath+"?access_token="+authKey, ioutil.NopCloser(body))
assert.NoError(err)
router.ServeHTTP(w, r)
assert.Equal(http.StatusCreated, w.Code)
w = httptest.NewRecorder()
args := fmt.Sprintf("&last=%s¤t=%s", lastRoot, types.NewRef(refList).TargetHash())
r, _ = newRequest("POST", dbName+constants.RootPath+"?access_token="+authKey+args, ioutil.NopCloser(body))
router.ServeHTTP(w, r)
assert.Equal(http.StatusOK, w.Code)
whash := wval.Hash()
hints := map[hash.Hash]struct{}{whash: struct{}{}}
rdr := buildGetRefsRequestBody(hints)
r, _ = newRequest("POST", dbName+constants.GetRefsPath, rdr)
r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
router.ServeHTTP(w, r)
assert.Equal(http.StatusOK, w.Code)
ms := chunks.NewMemoryStore()
chunks.Deserialize(w.Body, ms, nil)
v := types.DecodeValue(ms.Get(whash), datas.NewDatabase(ms))
assert.Equal(testString, string(v.(types.String)))
}
// SomeChunksP invokes callbacks on every unique chunk reachable from |r| in top-down order. Callbacks are invoked only once for each chunk regardless of how many times the chunk appears.
//
// |stopCb| is invoked for the types.Ref of every chunk. It can return true to stop SomeChunksP from descending any further.
// |chunkCb| is optional, invoked with the chunks.Chunk referenced by |stopCb| if it didn't return true.
func SomeChunksP(r types.Ref, bs types.BatchStore, stopCb SomeChunksStopCallback, chunkCb SomeChunksChunkCallback, concurrency int) {
rq := newRefQueue()
wg := sync.WaitGroup{}
mu := sync.Mutex{}
visitedRefs := map[hash.Hash]bool{}
walkChunk := func(r types.Ref) {
defer wg.Done()
tr := r.TargetHash()
mu.Lock()
visited := visitedRefs[tr]
visitedRefs[tr] = true
mu.Unlock()
if visited || stopCb(r) {
return
}
// Try to avoid the cost of reading |c|. It's only necessary if the caller wants to know about every chunk, or if we need to descend below |c| (ref height > 1).
var c chunks.Chunk
if chunkCb != nil || r.Height() > 1 {
c = bs.Get(tr)
d.Chk.False(c.IsEmpty())
if chunkCb != nil {
chunkCb(r, c)
}
}
if r.Height() == 1 {
return
}
v := types.DecodeValue(c, nil)
for _, r1 := range v.Chunks() {
wg.Add(1)
rq.tail() <- r1
}
}
iter := func() {
for r := range rq.head() {
walkChunk(r)
}
}
for i := 0; i < concurrency; i++ {
go iter()
}
wg.Add(1)
rq.tail() <- r
wg.Wait()
rq.close()
}
func traverseSource(srcRef types.Ref, srcDB, sinkDB Database) traverseResult {
h := srcRef.TargetHash()
if !sinkDB.has(h) {
srcBS := srcDB.validatingBatchStore()
c := srcBS.Get(h)
v := types.DecodeValue(c, srcDB)
d.Chk.True(v != nil, "Expected decoded chunk to be non-nil.")
sinkDB.validatingBatchStore().SchedulePut(c, srcRef.Height(), types.Hints{})
return traverseResult{h, v.Chunks(), len(c.Data())}
}
return traverseResult{}
}
