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odd.go
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odd.go
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// Copyright 2022 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 main
import (
"context"
"fmt"
"github.com/ServiceWeaver/weaver"
"go.opentelemetry.io/otel/trace"
)
// Odd computes the next value in the collatz sequence for odd integers.
type Odd interface {
// Do(ctx, x) returns 3x+1. x must be positive and odd.
Do(context.Context, int) (int, error)
}
type odd struct {
weaver.Implements[Odd]
}
func (o *odd) Do(ctx context.Context, x int) (int, error) {
trace.SpanFromContext(ctx).AddEvent(fmt.Sprintf("odd.Do(%d)", x))
if x <= 0 {
return 0, fmt.Errorf("%d is not positive", x)
}
if x%2 == 0 {
return 0, fmt.Errorf("%d is not odd", x)
}
return 3*x + 1, nil
}