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[processor/transform] Move function handling logic to common and gene…
…rify transform context. (open-telemetry#8972) * Move function handling logic to common and generify transform context. * Fix * Keep traces functions
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86 changes: 86 additions & 0 deletions
86
processor/transformprocessor/internal/common/expression.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // 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:https://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 common // import "github.com/open-telemetry/opentelemetry-collector-contrib/processor/transformprocessor/internal/common" | ||
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| import ( | ||
| "fmt" | ||
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| "go.opentelemetry.io/collector/model/pdata" | ||
| ) | ||
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| type TransformContext interface { | ||
| GetItem() interface{} | ||
| GetInstrumentationScope() pdata.InstrumentationScope | ||
| GetResource() pdata.Resource | ||
| } | ||
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| type ExprFunc func(ctx TransformContext) interface{} | ||
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| type Getter interface { | ||
| Get(ctx TransformContext) interface{} | ||
| } | ||
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| type Setter interface { | ||
| Set(ctx TransformContext, val interface{}) | ||
| } | ||
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| type GetSetter interface { | ||
| Getter | ||
| Setter | ||
| } | ||
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| type literal struct { | ||
| value interface{} | ||
| } | ||
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| func (l literal) Get(ctx TransformContext) interface{} { | ||
| return l.value | ||
| } | ||
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| type exprGetter struct { | ||
| expr ExprFunc | ||
| } | ||
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| func (g exprGetter) Get(ctx TransformContext) interface{} { | ||
| return g.expr(ctx) | ||
| } | ||
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| func NewGetter(val Value, functions map[string]interface{}, pathParser PathExpressionParser) (Getter, error) { | ||
| if s := val.String; s != nil { | ||
| return &literal{value: *s}, nil | ||
| } | ||
| if f := val.Float; f != nil { | ||
| return &literal{value: *f}, nil | ||
| } | ||
| if i := val.Int; i != nil { | ||
| return &literal{value: *i}, nil | ||
| } | ||
|
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| if val.Path != nil { | ||
| return pathParser(val.Path) | ||
| } | ||
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| if val.Invocation == nil { | ||
| // In practice, can't happen since the DSL grammar guarantees one is set | ||
| return nil, fmt.Errorf("no value field set. This is a bug in the transformprocessor") | ||
| } | ||
| call, err := NewFunctionCall(*val.Invocation, functions, pathParser) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &exprGetter{ | ||
| expr: call, | ||
| }, nil | ||
| } |
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