/
get.go
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/
get.go
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// Copyright 2020 Google LLC.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package get
import (
"context"
"errors"
"fmt"
"io"
"github.com/apigee/registry/cmd/registry/patch"
"github.com/apigee/registry/pkg/connection"
"github.com/apigee/registry/pkg/encoding"
"github.com/apigee/registry/pkg/visitor"
"github.com/apigee/registry/rpc"
"github.com/spf13/cobra"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
func Command() *cobra.Command {
var filter string
var output string
var nested bool
cmd := &cobra.Command{
Use: "get PATTERN",
Short: "Get resources from the API Registry",
Long: `Get resources from the API Registry.
The PATTERN of an entity must be begin with "project" or "apis" and must match
one of the following qualitied name patterns:
- apis/NAME
- apis/NAME/artifacts/NAME
- apis/NAME/versions/NAME
- apis/NAME/versions/NAME/specs/NAME[@REVISION]
- apis/NAME/versions/NAME/specs/NAME[@REVISION]/artifacts/NAME
- apis/NAME/deployments/NAME[@REVISION]/artifacts/NAME
In each case, a prefix of "project/NAME/locations/global/" is allowed but
not required, as it is assumed from the configuration.
The /NAME is an optional suffix. If not present, all entities of that
type are returned. A dash (-) may be also be used as a wildcard for
the complete NAME - either within a PATTERN or as a suffix.
The @REVISION is optional on Specs or Deployments. If missing, the latest
revision will be returned. A dash may also be used for REVISION
as a wildcard. Partial values with a wildcard are not supported.
The output from this command is always a single type of entity. By default,
it generates a simple text-based list of fully-qualified names.
The "--output yaml" or "--nested" parameters will generate a single top-level
YAML element, either the entity itself or an array named "items" that contains
the entities. In addition, if "--nested" is specified, each returned YAML
element will recursively include all sub-elements within its YAML.
Examples:
Retrieve the names of all apis:
registry get apis
Retrieve YAML for the latest revision of all specs named "openapi":
registry get --output yaml apis/-/versions/-/specs/openapi
Retrieve YAML for all deployment revisions of the "bookstore" api:
registry get --output yaml apis/bookstore/deployments/-@-
`,
Args: cobra.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
c, err := connection.ActiveConfig()
if err != nil {
return err
}
pattern := c.FQName(args[0])
registryClient, err := connection.NewRegistryClientWithSettings(ctx, c)
if err != nil {
return err
}
adminClient, err := connection.NewAdminClientWithSettings(ctx, c)
if err != nil {
return err
}
// default output
if output == "" {
if nested {
output = "yaml"
} else {
output = "name"
}
}
if nested && output != "yaml" {
return errors.New("--nested is only supported for yaml output")
}
// Create the visitor that will perform gets.
v := &getVisitor{
registryClient: registryClient,
adminClient: adminClient,
writer: cmd.OutOrStdout(),
output: output,
nested: nested,
}
// Visit the selected resources.
if err = visitor.Visit(ctx, v, visitor.VisitorOptions{
RegistryClient: registryClient,
AdminClient: adminClient,
Pattern: pattern,
PageSize: 1000,
Filter: filter,
}); err != nil {
if status.Code(err) == codes.NotFound {
fmt.Fprintln(cmd.ErrOrStderr(), "Not Found")
return nil
}
return err
}
// Write any accumulated output.
err = v.write()
if err != nil && status.Code(err) == codes.NotFound {
fmt.Fprintln(cmd.ErrOrStderr(), "Not Found")
return nil
}
return err
},
}
cmd.Flags().StringVar(&filter, "filter", "", "filter selected resources")
cmd.Flags().StringVarP(&output, "output", "o", "", "output type (name|yaml|contents)")
cmd.Flags().BoolVar(&nested, "nested", false, "include nested subresources in YAML output")
return cmd
}
type getVisitor struct {
registryClient connection.RegistryClient
adminClient connection.AdminClient
writer io.Writer
output string
nested bool
results []interface{} // result values to be returned in a single message
}
func (v *getVisitor) ProjectHandler() visitor.ProjectHandler {
return func(ctx context.Context, message *rpc.Project) error {
switch v.output {
case "name":
v.results = append(v.results, message.Name)
_, err := v.writer.Write([]byte(message.Name + "\n"))
return err
case "raw":
v.results = append(v.results, message)
return nil
case "yaml":
project, err := patch.NewProject(ctx, v.registryClient, message)
if err != nil {
return err
}
v.results = append(v.results, project)
return nil
default:
return newOutputTypeError("projects", v.output)
}
}
}
func (v *getVisitor) ApiHandler() visitor.ApiHandler {
return func(ctx context.Context, message *rpc.Api) error {
switch v.output {
case "name":
v.results = append(v.results, message.Name)
_, err := v.writer.Write([]byte(message.Name + "\n"))
return err
case "raw":
v.results = append(v.results, message)
return nil
case "yaml":
api, err := patch.NewApi(ctx, v.registryClient, message, v.nested)
if err != nil {
return err
}
v.results = append(v.results, api)
return nil
default:
return newOutputTypeError("apis", v.output)
}
}
}
func (v *getVisitor) VersionHandler() visitor.VersionHandler {
return func(ctx context.Context, message *rpc.ApiVersion) error {
switch v.output {
case "name":
v.results = append(v.results, message.Name)
_, err := v.writer.Write([]byte(message.Name + "\n"))
return err
case "raw":
v.results = append(v.results, message)
return nil
case "yaml":
version, err := patch.NewApiVersion(ctx, v.registryClient, message, v.nested)
if err != nil {
return err
}
v.results = append(v.results, version)
return nil
default:
return newOutputTypeError("versions", v.output)
}
}
}
func (v *getVisitor) DeploymentHandler() visitor.DeploymentHandler {
return func(ctx context.Context, message *rpc.ApiDeployment) error {
switch v.output {
case "name":
v.results = append(v.results, message.Name)
_, err := v.writer.Write([]byte(message.Name + "\n"))
return err
case "raw":
v.results = append(v.results, message)
return nil
case "yaml":
deployment, err := patch.NewApiDeployment(ctx, v.registryClient, message, v.nested)
if err != nil {
return err
}
v.results = append(v.results, deployment)
return nil
default:
return newOutputTypeError("deployments", v.output)
}
}
}
func (v *getVisitor) DeploymentRevisionHandler() visitor.DeploymentHandler {
return v.DeploymentHandler()
}
func (v *getVisitor) SpecHandler() visitor.SpecHandler {
return func(ctx context.Context, message *rpc.ApiSpec) error {
switch v.output {
case "name":
v.results = append(v.results, message.Name)
_, err := v.writer.Write([]byte(message.Name + "\n"))
return err
case "raw":
v.results = append(v.results, message)
return nil
case "contents":
if len(v.results) > 0 {
return fmt.Errorf("contents can be gotten for at most one spec")
}
if err := visitor.FetchSpecContents(ctx, v.registryClient, message); err != nil {
return err
}
v.results = append(v.results, message.GetContents())
return nil
case "yaml":
spec, err := patch.NewApiSpec(ctx, v.registryClient, message, v.nested)
if err != nil {
return err
}
v.results = append(v.results, spec)
return nil
default:
return newOutputTypeError("specs", v.output)
}
}
}
func (v *getVisitor) SpecRevisionHandler() visitor.SpecHandler {
return v.SpecHandler()
}
func (v *getVisitor) ArtifactHandler() visitor.ArtifactHandler {
return func(ctx context.Context, message *rpc.Artifact) error {
switch v.output {
case "name":
v.results = append(v.results, message.Name)
_, err := v.writer.Write([]byte(message.Name + "\n"))
return err
case "raw":
v.results = append(v.results, message)
return nil
case "contents":
if len(v.results) > 0 {
return fmt.Errorf("contents can be gotten for at most one artifact")
}
if err := visitor.FetchArtifactContents(ctx, v.registryClient, message); err != nil {
return err
}
v.results = append(v.results, message.GetContents())
return nil
case "yaml":
if err := visitor.FetchArtifactContents(ctx, v.registryClient, message); err != nil {
return err
}
artifact, err := patch.NewArtifact(ctx, v.registryClient, message)
if err != nil {
return err
}
v.results = append(v.results, artifact)
return nil
default:
return newOutputTypeError("artifacts", v.output)
}
}
}
func newOutputTypeError(resourceType, outputType string) error {
return fmt.Errorf("%s do not support the %q output type", resourceType, outputType)
}
func (v *getVisitor) write() error {
if len(v.results) == 0 {
return status.Error(codes.NotFound, "no matching results found")
}
if v.output == "yaml" {
var result interface{}
if len(v.results) == 1 {
result = v.results[0]
} else {
result = &encoding.List{
Header: encoding.Header{ApiVersion: encoding.RegistryV1},
Items: v.results,
}
}
bytes, err := encoding.EncodeYAML(result)
if err != nil {
return err
}
_, err = v.writer.Write(bytes)
return err
}
if v.output == "raw" {
if _, err := v.writer.Write([]byte("[")); err != nil {
return err
}
for i, r := range v.results {
if i > 0 {
if _, err := v.writer.Write([]byte(",")); err != nil {
return err
}
}
b, err := protojson.Marshal(r.(proto.Message))
if err != nil {
return err
}
if _, err := v.writer.Write(b); err != nil {
return err
}
}
if _, err := v.writer.Write([]byte("]")); err != nil {
return err
}
return nil
}
if v.output == "contents" {
if len(v.results) == 1 {
_, err := v.writer.Write(v.results[0].([]byte))
return err
}
}
return nil
}