57 lines
1.0 KiB
Go
57 lines
1.0 KiB
Go
package main
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import (
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"fmt"
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"math/rand"
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"time"
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)
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var (
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Web = fakeSearch("web")
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Image = fakeSearch("image")
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Video = fakeSearch("video")
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)
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type Search func(query string) Result
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type Result struct {
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Goodies string
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}
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func fakeSearch(kind string) Search {
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return func(query string) Result {
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time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
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return Result{fmt.Sprintf("%s result for %q", kind, query)}
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}
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}
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func First(query string, replicas ...Search) Result {
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c := make(chan Result)
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searchReplica := func(i int) {
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c <- replicas[i](query)
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}
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for i := range replicas {
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go searchReplica(i)
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}
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return <-c
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}
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func Google(query string) (results []Result) {
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c := make(chan Result)
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go func() { c <- First(query, Web, Web) }()
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go func() { c <- First(query, Image, Image) }()
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go func() { c <- First(query, Video, Video) }()
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timeout := time.After(80 * time.Millisecond)
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for i := 0; i < 3; i++ {
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select {
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case result := <-c:
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results = append(results, result)
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case <-timeout:
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fmt.Println("timed out!!")
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return
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}
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}
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return
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}
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