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Read-only scope metadata access for the CLI (#349)
Read-only scope metadata access for the CLI
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| // 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 main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "github.com/uber-go/dosa" | ||
| ) | ||
|
|
||
| // ScopeList contains data for executing scope truncate command. | ||
| type ScopeList struct { | ||
| *ScopeCmd | ||
| } | ||
|
|
||
| func newScopeList(provideClient mdClientProvider) *ScopeList { | ||
| return &ScopeList{ | ||
| ScopeCmd: &ScopeCmd{ | ||
| provideMDClient: provideClient, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // Execute executes a scope list command | ||
| func (c *ScopeList) Execute(args []string) error { | ||
| client, err := c.makeClient() | ||
| if err != nil { | ||
| return errors.Wrap(err, "could not make client") | ||
| } | ||
| defer shutdownMDClient(client) | ||
|
|
||
| var scopes []string | ||
| if scopes, err = c.getScopes(client); err == nil { | ||
| return err | ||
| } | ||
| for _, sp := range scopes { | ||
| fmt.Println(sp) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *ScopeList) getScopes(client dosa.Client) ([]string, error) { | ||
| scopeList := []string{} | ||
|
|
||
| var md dosa.ScopeMetadata | ||
| scanOp := dosa.NewScanOp(&md).Limit(100).Fields([]string{"Name"}) | ||
| for { | ||
| ctx, cancel := context.WithTimeout(context.Background(), options.Timeout.Duration()) | ||
| defer cancel() | ||
|
|
||
| scopes, token, err := client.ScanEverything(ctx, scanOp) | ||
| if err != nil { | ||
| if dosa.ErrorIsNotFound(err) { | ||
| break | ||
| } | ||
| fmt.Printf("MD table scan failed (token=%q): %v\n", token, err) | ||
| continue | ||
| } | ||
| scanOp.Offset(token) | ||
|
|
||
| for _, e := range scopes { | ||
| md := e.(*dosa.ScopeMetadata) | ||
| scopeList = append(scopeList, md.Name) | ||
| } | ||
| } | ||
| return scopeList, nil | ||
| } | ||
|
|
||
| // ScopeShow displays metadata for the specified scopes. | ||
| type ScopeShow struct { | ||
| *ScopeCmd | ||
| Args struct { | ||
| Scopes []string `positional-arg-name:"scopes" required:"1"` | ||
| } `positional-args:"yes" required:"1"` | ||
| } | ||
|
|
||
| func newScopeShow(provideClient mdClientProvider) *ScopeShow { | ||
| return &ScopeShow{ | ||
| ScopeCmd: &ScopeCmd{ | ||
| provideMDClient: provideClient, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // Execute shows MD for the scope(s) | ||
| func (c *ScopeShow) Execute(args []string) error { | ||
| client, err := c.makeClient() | ||
| if err != nil { | ||
| return errors.Wrap(err, "could not make client") | ||
| } | ||
| defer shutdownMDClient(client) | ||
|
|
||
| for _, scope := range args { | ||
| if md, err := c.getMetadata(client, scope); err != nil { | ||
| fmt.Printf("Could not read scope metadata for %q: %v\n", scope, err) | ||
| } else { | ||
| fmt.Printf("%+v\n", md) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // getMetadata returns the MD for a scope. Currently prefixes (for prod) are not handled; the intent | ||
| // is that a scope may be qualified by a name-prefix, as in "production.vsoffers". | ||
| func (c *ScopeShow) getMetadata(client dosa.Client, scope string) (*dosa.ScopeMetadata, error) { | ||
| ctx, cancel := context.WithTimeout(context.Background(), options.Timeout.Duration()) | ||
| defer cancel() | ||
|
|
||
| md := &dosa.ScopeMetadata{Name: scope} | ||
| if err := client.Read(ctx, dosa.All(), md); err != nil { | ||
| return nil, err | ||
| } | ||
| return md, nil | ||
| } | ||
|
|
||
| func (c *ScopeCmd) makeClient() (dosa.Client, error) { | ||
| if options.ServiceName == "" { | ||
| options.ServiceName = _defServiceName | ||
| } | ||
| return c.provideMDClient(options) | ||
| } |
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