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common.go
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/
common.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package namespace
import (
"errors"
"fmt"
"net/http"
"path"
clusterclient "github.com/m3db/m3/src/cluster/client"
"github.com/m3db/m3/src/cluster/kv"
nsproto "github.com/m3db/m3/src/dbnode/generated/proto/namespace"
"github.com/m3db/m3/src/dbnode/namespace"
"github.com/m3db/m3/src/query/api/v1/handler/prometheus/handleroptions"
"github.com/m3db/m3/src/query/util/logging"
"github.com/m3db/m3/src/x/instrument"
"github.com/gorilla/mux"
)
const (
// M3DBServiceName is the service name for M3DB.
M3DBServiceName = "m3db"
// ServicesPathName is the services part of the API path.
ServicesPathName = "services"
// M3DBNodeNamespacesKey is the KV key that holds namespaces.
M3DBNodeNamespacesKey = "m3db.node.namespaces"
// NamespacePathName is the namespace part of the API path.
NamespacePathName = "namespace"
// SchemaPathName is the schema part of the API path.
SchemaPathName = "schema"
)
var (
// M3DBServiceNamespacePathName is the M3DB service namespace API path.
M3DBServiceNamespacePathName = path.Join(ServicesPathName, M3DBServiceName, NamespacePathName)
// M3DBServiceSchemaPathName is the M3DB service schema API path.
M3DBServiceSchemaPathName = path.Join(ServicesPathName, M3DBServiceName, SchemaPathName)
errNamespaceNotFound = errors.New("unable to find a namespace with specified name")
)
// Handler represents a generic handler for namespace endpoints.
type Handler struct {
// This is used by other namespace Handlers
// nolint: structcheck
client clusterclient.Client
instrumentOpts instrument.Options
}
// Metadata returns the current metadata in the given store and its version
func Metadata(store kv.Store) ([]namespace.Metadata, int, error) {
value, err := store.Get(M3DBNodeNamespacesKey)
if err != nil {
// From the perspective of namespace handlers, having had no metadata
// set at all is semantically the same as having an empty slice of
// metadata and is not a real error state.
if err == kv.ErrNotFound {
return []namespace.Metadata{}, 0, nil
}
return nil, -1, err
}
var protoRegistry nsproto.Registry
if err := value.Unmarshal(&protoRegistry); err != nil {
return nil, -1, fmt.Errorf("unable to parse value, err: %v", err)
}
nsMap, err := namespace.FromProto(protoRegistry)
if err != nil {
return nil, -1, err
}
return nsMap.Metadatas(), value.Version(), nil
}
// RegisterRoutes registers the namespace routes.
func RegisterRoutes(
r *mux.Router,
client clusterclient.Client,
defaults []handleroptions.ServiceOptionsDefault,
instrumentOpts instrument.Options,
) {
wrapped := func(n http.Handler) http.Handler {
return logging.WithResponseTimeAndPanicErrorLogging(n, instrumentOpts)
}
applyMiddleware := func(
f func(svc handleroptions.ServiceNameAndDefaults,
w http.ResponseWriter, r *http.Request),
defaults []handleroptions.ServiceOptionsDefault,
) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
svc := handleroptions.ServiceNameAndDefaults{
ServiceName: handleroptions.M3DBServiceName,
Defaults: defaults,
}
f(svc, w, r)
})
}
// Get M3DB namespaces.
getHandler := wrapped(NewGetHandler(client, instrumentOpts))
r.HandleFunc(DeprecatedM3DBGetURL, getHandler.ServeHTTP).Methods(GetHTTPMethod)
r.HandleFunc(M3DBGetURL, getHandler.ServeHTTP).Methods(GetHTTPMethod)
// Add M3DB namespaces.
addHandler := wrapped(
applyMiddleware(NewAddHandler(client, instrumentOpts).ServeHTTP, defaults))
r.HandleFunc(DeprecatedM3DBAddURL, addHandler.ServeHTTP).Methods(AddHTTPMethod)
r.HandleFunc(M3DBAddURL, addHandler.ServeHTTP).Methods(AddHTTPMethod)
// Update M3DB namespaces.
updateHandler := wrapped(
applyMiddleware(NewUpdateHandler(client, instrumentOpts).ServeHTTP, defaults))
r.HandleFunc(M3DBUpdateURL, updateHandler.ServeHTTP).Methods(UpdateHTTPMethod)
// Delete M3DB namespaces.
deleteHandler := wrapped(NewDeleteHandler(client, instrumentOpts))
r.HandleFunc(DeprecatedM3DBDeleteURL, deleteHandler.ServeHTTP).Methods(DeleteHTTPMethod)
r.HandleFunc(M3DBDeleteURL, deleteHandler.ServeHTTP).Methods(DeleteHTTPMethod)
// Deploy M3DB schemas.
schemaHandler := wrapped(
applyMiddleware(NewSchemaHandler(client, instrumentOpts).ServeHTTP, defaults))
r.HandleFunc(M3DBSchemaURL, schemaHandler.ServeHTTP).Methods(SchemaDeployHTTPMethod)
// Reset M3DB schemas.
schemaResetHandler := wrapped(
applyMiddleware(NewSchemaResetHandler(client, instrumentOpts).ServeHTTP, defaults))
r.HandleFunc(M3DBSchemaURL, schemaResetHandler.ServeHTTP).Methods(DeleteHTTPMethod)
}