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Extract UserData from CloudFormation output during testing
This gives us some sanity, so we can peek inside the base64 blob
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| /* | ||
| Copyright 2017 The Kubernetes Authors. | ||
| 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 jsonutils | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "strings" | ||
| ) | ||
|
|
||
| // JSONStreamWriter writes tokens as parsed by a json.Decoder back to a string | ||
| type JSONStreamWriter struct { | ||
| // out is the output destination | ||
| out io.Writer | ||
|
|
||
| // indent is the current indent level | ||
| indent string | ||
|
|
||
| // state stores a stack of the json state, comprised of [ { and F characters. F=field | ||
| state string | ||
|
|
||
| // deferred is used to buffer the output temporarily, used to prevent a trailing comma in an object | ||
| deferred string | ||
|
|
||
| // path is the current stack of fields, used to support the Path() function | ||
| path []string | ||
| } | ||
|
|
||
| // NewJSONStreamWriter is the constructor for a JSONStreamWriter | ||
| func NewJSONStreamWriter(out io.Writer) *JSONStreamWriter { | ||
| return &JSONStreamWriter{ | ||
| out: out, | ||
| } | ||
| } | ||
|
|
||
| // Path returns the path to the current position in the JSON tree | ||
| func (j *JSONStreamWriter) Path() string { | ||
| return strings.Join(j.path, ".") | ||
| } | ||
|
|
||
| // WriteToken writes the next token to the output | ||
| func (j *JSONStreamWriter) WriteToken(token json.Token) error { | ||
| state := byte(0) | ||
| if j.state != "" { | ||
| state = j.state[len(j.state)-1] | ||
| } | ||
|
|
||
| var v string | ||
| switch tt := token.(type) { | ||
| // Delim, for the four JSON delimiters [ ] { } | ||
| case json.Delim: | ||
| v = tt.String() | ||
| indent := j.indent | ||
| switch tt { | ||
| case json.Delim('{'): | ||
| j.indent += " " | ||
| j.state += "{" | ||
| case json.Delim('['): | ||
| j.indent += " " | ||
| j.state += "[" | ||
| case json.Delim(']'), json.Delim('}'): | ||
| j.indent = j.indent[:len(j.indent)-2] | ||
| indent = j.indent | ||
| j.state = j.state[:len(j.state)-1] | ||
| if j.state != "" && j.state[len(j.state)-1] == 'F' { | ||
| j.state = j.state[:len(j.state)-1] | ||
| j.path = j.path[:len(j.path)-1] | ||
| } | ||
| // Don't put a comma on the last field in a block | ||
| if j.deferred == ",\n" { | ||
| j.deferred = "\n" | ||
| } | ||
| default: | ||
| return fmt.Errorf("unknown delim: %v", tt) | ||
| } | ||
|
|
||
| switch state { | ||
| case 0: | ||
| if err := j.writeRaw(indent + v); err != nil { | ||
| return err | ||
| } | ||
| case '{': | ||
| if err := j.writeRaw(indent + v); err != nil { | ||
| return err | ||
| } | ||
| case '[': | ||
| if err := j.writeRaw(indent + v); err != nil { | ||
| return err | ||
| } | ||
| case 'F': | ||
| if err := j.writeRaw(v); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| default: | ||
| return fmt.Errorf("unhandled state for json delim serialization: %v %q", state, j.state) | ||
| } | ||
|
|
||
| switch tt { | ||
| case json.Delim('{'): | ||
| j.deferred = "\n" | ||
| case json.Delim('['): | ||
| j.deferred = "\n" | ||
| case json.Delim(']'), json.Delim('}'): | ||
| j.deferred = ",\n" | ||
| default: | ||
| return fmt.Errorf("unknown delim: %v", tt) | ||
| } | ||
|
|
||
| return nil | ||
|
|
||
| // bool, for JSON booleans | ||
| case bool: | ||
| v = fmt.Sprintf("%v", tt) | ||
|
|
||
| // string, for JSON string literals | ||
| case string: | ||
| v = "\"" + tt + "\"" | ||
|
|
||
| // float64, for JSON numbers | ||
| case float64: | ||
| v = fmt.Sprintf("%g", tt) | ||
|
|
||
| // Number, for JSON numbers | ||
| case json.Number: | ||
| v = tt.String() | ||
|
|
||
| // nil, for JSON null | ||
| case nil: | ||
| v = "null" | ||
|
|
||
| default: | ||
| return fmt.Errorf("unhandled token type %T", tt) | ||
| } | ||
|
|
||
| switch state { | ||
| case '{': | ||
| j.state += "F" | ||
| j.path = append(j.path, fmt.Sprintf("%s", token)) | ||
| return j.writeRaw(j.indent + v + ": ") | ||
| case '[': | ||
| if err := j.writeRaw(j.indent + v); err != nil { | ||
| return err | ||
| } | ||
| j.deferred = ",\n" | ||
| return nil | ||
| case 'F': | ||
| j.state = j.state[:len(j.state)-1] | ||
| j.path = j.path[:len(j.path)-1] | ||
| if err := j.writeRaw(v); err != nil { | ||
| return err | ||
| } | ||
| j.deferred = ",\n" | ||
| return nil | ||
| } | ||
|
|
||
| return fmt.Errorf("unhandled state for json value (%T %q) serialization: %v %q", token, v, state, j.state) | ||
| } | ||
|
|
||
| func (j *JSONStreamWriter) writeRaw(s string) error { | ||
| if j.deferred != "" { | ||
| if _, err := j.out.Write([]byte(j.deferred)); err != nil { | ||
| return err | ||
| } | ||
| j.deferred = "" | ||
| } | ||
| _, err := j.out.Write([]byte(s)) | ||
| return err | ||
| } |
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