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Deprecate all types and funcs in config package
The main reason is to remove the circular dependency between the config (including sub-packages) and component. Here is the current state: * component depends on config * config/sub-package[grpc, http, etc.] depends on config & component Because of this "circular" dependency, we cannot split for example "config" into its own module, only if all the other config sub-packages are also split. Signed-off-by: Bogdan <bogdandrutu@gmail.com>
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# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix' | ||
change_type: deprecation | ||
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# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver) | ||
component: config | ||
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# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`). | ||
note: Deprecate all types and funcs in `config` package | ||
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# One or more tracking issues or pull requests related to the change | ||
issues: [6422] | ||
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# (Optional) One or more lines of additional information to render under the primary note. | ||
# These lines will be padded with 2 spaces and then inserted directly into the document. | ||
# Use pipe (|) for multiline entries. | ||
subtext: | | ||
- config.Type => component.Type | ||
- config.DataType => component.DataType | ||
- config.Receiver => component.ReceiverConfig | ||
- config.UnmarshalReceiver => component.UnmarshalReceiverConfig | ||
- config.[New]ReceiverSettings => component.[New]ReceiverConfigSettings | ||
- config.Processor => component.ProcessorConfig | ||
- config.UnmarshalProcessor => component.UnmarshalProcessorConfig | ||
- config.[New]ProcessorSettings => component.[New]ProcessorConfigSettings | ||
- config.Exporter => component.ExporterConfig | ||
- config.UnmarshalExporter => component.UnmarshalExporterConfig | ||
- config.[New]ExporterSettings => component.[New]ExporterConfigSettings | ||
- config.Extension => component.ExtensionConfig | ||
- config.UnmarshalExtension => component.UnmarshalExtensionConfig | ||
- config.[New]ExtensionSettings => component.[New]ExtensionConfigSettings |
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// Copyright The OpenTelemetry 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. | ||
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package componenttest // import "go.opentelemetry.io/collector/component/componenttest" | ||
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import ( | ||
"fmt" | ||
"reflect" | ||
"regexp" | ||
"strings" | ||
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"go.uber.org/multierr" | ||
) | ||
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// The regular expression for valid config field tag. | ||
var configFieldTagRegExp = regexp.MustCompile("^[a-z0-9][a-z0-9_]*$") | ||
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// CheckConfigStruct enforces that given configuration object is following the patterns | ||
// used by the collector. This ensures consistency between different implementations | ||
// of components and extensions. It is recommended for implementers of components | ||
// to call this function on their tests passing the default configuration of the | ||
// component factory. | ||
func CheckConfigStruct(config interface{}) error { | ||
t := reflect.TypeOf(config) | ||
if t.Kind() == reflect.Ptr { | ||
t = t.Elem() | ||
} | ||
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if t.Kind() != reflect.Struct { | ||
return fmt.Errorf("config must be a struct or a pointer to one, the passed object is a %s", t.Kind()) | ||
} | ||
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return validateConfigDataType(t) | ||
} | ||
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// validateConfigDataType performs a descending validation of the given type. | ||
// If the type is a struct it goes to each of its fields to check for the proper | ||
// tags. | ||
func validateConfigDataType(t reflect.Type) error { | ||
var errs error | ||
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switch t.Kind() { | ||
case reflect.Ptr: | ||
errs = multierr.Append(errs, validateConfigDataType(t.Elem())) | ||
case reflect.Struct: | ||
// Reflect on the pointed data and check each of its fields. | ||
nf := t.NumField() | ||
for i := 0; i < nf; i++ { | ||
f := t.Field(i) | ||
errs = multierr.Append(errs, checkStructFieldTags(f)) | ||
} | ||
default: | ||
// The config object can carry other types but they are not used when | ||
// reading the configuration via koanf so ignore them. Basically ignore: | ||
// reflect.Uintptr, reflect.Chan, reflect.Func, reflect.Interface, and | ||
// reflect.UnsafePointer. | ||
} | ||
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if errs != nil { | ||
return fmt.Errorf("type %q from package %q has invalid config settings: %w", t.Name(), t.PkgPath(), errs) | ||
} | ||
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return nil | ||
} | ||
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// checkStructFieldTags inspects the tags of a struct field. | ||
func checkStructFieldTags(f reflect.StructField) error { | ||
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tagValue := f.Tag.Get("mapstructure") | ||
if tagValue == "" { | ||
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// Ignore special types. | ||
switch f.Type.Kind() { | ||
case reflect.Interface, reflect.Chan, reflect.Func, reflect.Uintptr, reflect.UnsafePointer: | ||
// Allow the config to carry the types above, but since they are not read | ||
// when loading configuration, just ignore them. | ||
return nil | ||
} | ||
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// Public fields of other types should be tagged. | ||
chars := []byte(f.Name) | ||
if len(chars) > 0 && chars[0] >= 'A' && chars[0] <= 'Z' { | ||
return fmt.Errorf("mapstructure tag not present on field %q", f.Name) | ||
} | ||
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// Not public field, no need to have a tag. | ||
return nil | ||
} | ||
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tagParts := strings.Split(tagValue, ",") | ||
if tagParts[0] != "" { | ||
if tagParts[0] == "-" { | ||
// Nothing to do, as mapstructure decode skips this field. | ||
return nil | ||
} | ||
} | ||
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// Check if squash is specified. | ||
squash := false | ||
for _, tag := range tagParts[1:] { | ||
if tag == "squash" { | ||
squash = true | ||
break | ||
} | ||
} | ||
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if squash { | ||
// Field was squashed. | ||
if (f.Type.Kind() != reflect.Struct) && (f.Type.Kind() != reflect.Ptr || f.Type.Elem().Kind() != reflect.Struct) { | ||
return fmt.Errorf( | ||
"attempt to squash non-struct type on field %q", f.Name) | ||
} | ||
} | ||
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switch f.Type.Kind() { | ||
case reflect.Struct: | ||
// It is another struct, continue down-level. | ||
return validateConfigDataType(f.Type) | ||
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case reflect.Map, reflect.Slice, reflect.Array: | ||
// The element of map, array, or slice can be itself a configuration object. | ||
return validateConfigDataType(f.Type.Elem()) | ||
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default: | ||
fieldTag := tagParts[0] | ||
if !configFieldTagRegExp.MatchString(fieldTag) { | ||
return fmt.Errorf( | ||
"field %q has config tag %q which doesn't satisfy %q", | ||
f.Name, | ||
fieldTag, | ||
configFieldTagRegExp.String()) | ||
} | ||
} | ||
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return nil | ||
} |
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