func makeMutation(mmap map[string][]*cassandra.Mutation, cf, name string,
value []byte, now time.Time) {
var m *cassandra.Mutation = cassandra.NewMutation()
var col *cassandra.Column = cassandra.NewColumn()
col.Name = []byte(name)
col.Value = value
col.Timestamp = proto.Int64(now.UnixNano())
m.ColumnOrSupercolumn = cassandra.NewColumnOrSuperColumn()
m.ColumnOrSupercolumn.Column = col
mmap[cf] = append(mmap[cf], m)
}
func (self *ProductEditAPI) ServeHTTP(w http.ResponseWriter, req *http.Request) {
var buf *bytes.Buffer = new(bytes.Buffer)
var specid string = req.PostFormValue("id")
var uuid UUID
var codes *Barcodes = new(Barcodes)
var mmap map[string]map[string][]*cassandra.Mutation
var tsprefix []byte
var prod Product
var mutations []*cassandra.Mutation
var mutation *cassandra.Mutation
var col *cassandra.Column
var ire *cassandra.InvalidRequestException
var ue *cassandra.UnavailableException
var te *cassandra.TimedOutException
var barcode string
var now time.Time = time.Now()
var err error
var match bool
numRequests.Add(1)
numAPIRequests.Add(1)
// Check the user is in the reqeuested scope.
if !self.authenticator.IsAuthenticatedScope(req, self.scope) {
numDisallowedScope.Add(1)
http.Error(w,
"You are not in the right group to access this resource",
http.StatusForbidden)
return
}
// Check if the product name has been specified.
prod.Name = req.PostFormValue("prodname")
if len(prod.Name) <= 0 {
log.Print("Parsing product name: ", err)
http.Error(w, "Product name empty", http.StatusNotAcceptable)
return
}
prod.Price, err = strconv.ParseFloat(req.PostFormValue("price"), 64)
if err != nil {
log.Print("Parsing price: ", err)
http.Error(w, "price: "+err.Error(), http.StatusNotAcceptable)
return
}
prod.Stock, err = strconv.ParseUint(req.PostFormValue("stock"), 10, 64)
if err != nil {
log.Print("Parsing stock: ", err)
http.Error(w, "stock: "+err.Error(), http.StatusNotAcceptable)
return
}
// Check if the barcode has been given. If it was, it needs to be
// numeric (EAN-13). If we find different types of barcodes we can
// always revise this.
for _, barcode = range req.PostForm["barcode"] {
barcode = strings.Replace(barcode, " ", "", -1)
if len(barcode) > 0 {
match, err = regexp.MatchString("^[0-9]+$", barcode)
if err != nil {
productEditErrors.Add(err.Error(), 1)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if match {
codes.Barcode = append(codes.Barcode, barcode)
} else {
productEditErrors.Add("barcode-format-error", 1)
http.Error(w, "Barcode should only contain numbers",
http.StatusNotAcceptable)
return
}
}
}
// Create column data for the product row.
col = cassandra.NewColumn()
col.Name = []byte("name")
col.Value = []byte(prod.Name)
col.Timestamp = now.Unix()
mutation = cassandra.NewMutation()
mutation.ColumnOrSupercolumn = cassandra.NewColumnOrSuperColumn()
mutation.ColumnOrSupercolumn.Column = col
mutations = append(mutations, mutation)
err = binary.Write(buf, binary.BigEndian, prod.Price)
if err != nil {
productEditErrors.Add(err.Error(), 1)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
col = cassandra.NewColumn()
col.Name = []byte("price")
col.Value = buf.Bytes()
col.Timestamp = now.Unix()
mutation = cassandra.NewMutation()
mutation.ColumnOrSupercolumn = cassandra.NewColumnOrSuperColumn()
mutation.ColumnOrSupercolumn.Column = col
mutations = append(mutations, mutation)
buf = new(bytes.Buffer)
err = binary.Write(buf, binary.BigEndian, prod.Stock)
if err != nil {
productEditErrors.Add(err.Error(), 1)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
col = cassandra.NewColumn()
col.Name = []byte("stock")
col.Value = buf.Bytes()
col.Timestamp = now.Unix()
mutation = cassandra.NewMutation()
mutation.ColumnOrSupercolumn = cassandra.NewColumnOrSuperColumn()
mutation.ColumnOrSupercolumn.Column = col
mutations = append(mutations, mutation)
col = cassandra.NewColumn()
col.Name = []byte("barcodes")
col.Value, err = proto.Marshal(codes)
if err != nil {
productEditErrors.Add(err.Error(), 1)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
col.Timestamp = now.Unix()
mutation = cassandra.NewMutation()
mutation.ColumnOrSupercolumn = cassandra.NewColumnOrSuperColumn()
mutation.ColumnOrSupercolumn.Column = col
mutations = append(mutations, mutation)
// If we're editing an existing product, re-use that UUID. Otherwise,
// generate one.
if len(specid) > 0 {
uuid, err = ParseUUID(specid)
} else {
uuid, err = GenTimeUUID(&now)
}
if err != nil {
productEditErrors.Add(err.Error(), 1)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
mmap = make(map[string]map[string][]*cassandra.Mutation)
mmap[string(uuid)] = make(map[string][]*cassandra.Mutation)
mmap[string(uuid)]["products"] = mutations
// Create the entry in the products_byname index.
mutations = make([]*cassandra.Mutation, 0)
col = cassandra.NewColumn()
col.Name = []byte("product")
col.Value = uuid
col.Timestamp = now.Unix()
mutation = cassandra.NewMutation()
mutation.ColumnOrSupercolumn = cassandra.NewColumnOrSuperColumn()
mutation.ColumnOrSupercolumn.Column = col
mutations = append(mutations, mutation)
mmap[prod.Name] = make(map[string][]*cassandra.Mutation)
mmap[prod.Name]["products_byname"] = mutations
// If a barcode has been given, specify it in the products_bybarcode
// column.
if len(barcode) > 0 {
mmap[barcode] = make(map[string][]*cassandra.Mutation)
mmap[barcode]["products_bybarcode"] = mutations
}
// Log a timeseries entry stating that the product has been present
// at the time.
mutations = make([]*cassandra.Mutation, 0)
col = cassandra.NewColumn()
col.Name = []byte("product-count")
col.Value = buf.Bytes() // still the product count from above.
col.Timestamp = now.Unix()
mutation = cassandra.NewMutation()
mutation.ColumnOrSupercolumn = cassandra.NewColumnOrSuperColumn()
mutation.ColumnOrSupercolumn.Column = col
mutations = append(mutations, mutation)
// Create the TS prefix: first the UUID, then the timestamp.
buf = new(bytes.Buffer)
err = binary.Write(buf, binary.BigEndian, now.UnixNano())
if err != nil {
productEditErrors.Add(err.Error(), 1)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
tsprefix = make([]byte, len(uuid)+buf.Len()+1)
copy(tsprefix, uuid)
tsprefix[len(uuid)] = ':'
for i, v := range buf.Bytes() {
tsprefix[len(uuid)+i+1] = v
}
mmap[string(tsprefix)] = make(map[string][]*cassandra.Mutation)
mmap[string(tsprefix)]["product_tsdata"] = mutations
// Now, write the mutations to the database.
ire, ue, te, err = self.client.AtomicBatchMutate(mmap,
cassandra.ConsistencyLevel_QUORUM)
if ire != nil {
log.Println("Invalid request: ", ire.Why)
productEditErrors.Add(ire.Why, 1)
return
}
if ue != nil {
log.Println("Unavailable")
productEditErrors.Add("unavailable", 1)
return
}
if te != nil {
log.Println("Request to database backend timed out")
productEditErrors.Add("timeout", 1)
return
}
if err != nil {
log.Println("Generic error: ", err)
productEditErrors.Add(err.Error(), 1)
return
}
}