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Guangming Wang
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May 25, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| package main | ||
|
|
||
| //https://github.com/golang/go/issues/24652 | ||
| import ( | ||
| "crypto/x509" | ||
| "fmt" | ||
| "log" | ||
| ) | ||
|
|
||
| func main() { | ||
| certs, err := x509.SystemCertPool() | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| fmt.Printf("Num System Certs: %d\n", len(certs.Subjects())) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/olivere/elastic/v7" | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
| "sync" | ||
| ) | ||
|
|
||
| func main() { | ||
| // Starting with elastic.v5, you must pass a context to execute each service | ||
| ctx := context.Background() | ||
| println() | ||
|
|
||
| // Obtain a client and connect to the default Elasticsearch installation | ||
| // on 127.0.0.1:9200. Of course you can configure your client to connect | ||
| // to other hosts and configure it in various other ways. | ||
| tp := http.DefaultTransport | ||
| tp.(*http.Transport).MaxIdleConnsPerHost = 100 | ||
| httpClient := &http.Client{Transport: tp} | ||
| client, err := elastic.NewClient( | ||
| elastic.SetInfoLog(log.New(os.Stdout, "", log.LstdFlags)), | ||
| elastic.SetHttpClient(httpClient), | ||
| ) | ||
| if err != nil { | ||
| // Handle error | ||
| panic(err) | ||
| } | ||
|
|
||
| // Ping the Elasticsearch server to get e.g. the version number | ||
| info, code, err := client.Ping("http://127.0.0.1:9200").Do(ctx) | ||
| if err != nil { | ||
| // Handle error | ||
| panic(err) | ||
| } | ||
| fmt.Printf("Elasticsearch returned with code %d and version %s\n", code, info.Version.Number) | ||
| // Search with a term query | ||
| termQuery := elastic.NewTermQuery("machine.os", "linux") | ||
|
|
||
| wg := sync.WaitGroup{} | ||
| for i:=0 ; i<5 ; i++ { | ||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
| for { | ||
| searchResult, err := client.Search(). | ||
| Index("kibana_sample_data_logs"). // search in index "twitter" | ||
| Query(termQuery). // specify the query | ||
| //Sort("user", true). // sort by "user" field, ascending | ||
| //From(0).Size(10). // take documents 0-9 | ||
| //Pretty(true). // pretty print request and response JSON | ||
| Do(ctx) // execute | ||
| if err != nil { | ||
| // Handle error | ||
| panic(err) | ||
| } | ||
| // searchResult is of type SearchResult and returns hits, suggestions, | ||
| // and all kinds of other information from Elasticsearch. | ||
| fmt.Printf("Query took %d milliseconds\n", searchResult.TookInMillis) | ||
| fmt.Println(searchResult.Hits.TotalHits.Value) | ||
| } | ||
| }() | ||
| } | ||
| wg.Wait() | ||
| fmt.Println("all work done") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "math/rand" | ||
| "time" | ||
| ) | ||
|
|
||
| func main(){ | ||
| rand.Seed(time.Now().UnixNano()) | ||
| i := rand.Intn(100) | ||
| fmt.Printf("%v at %p", i, &i) | ||
| for { | ||
| } | ||
| } |