45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
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// Copyright (c) 2014 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package bloom_test
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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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"github.com/conformal/btcutil/bloom"
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"github.com/conformal/btcwire"
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)
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// This example creates a new bloom filter, adds a transaction hash to it, and
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// shows how to check if the filter matches the transaction.
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func ExampleNewFilter() {
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rand.Seed(time.Now().UnixNano())
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tweak := rand.Uint32()
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// Create a new bloom filter intended to hold 10 elements with a 0.01%
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// false positive rate and does not include any automatic update
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// functionality when transactions are matched.
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filter := bloom.NewFilter(10, tweak, 0.0001, btcwire.BloomUpdateNone)
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// Create a transaction hash and add it to the filter. This particular
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// trasaction is the first transaction in block 310,000 of the main
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// bitcoin block chain.
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txHashStr := "fd611c56ca0d378cdcd16244b45c2ba9588da3adac367c4ef43e808b280b8a45"
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txHash, err := btcwire.NewShaHashFromStr(txHashStr)
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if err != nil {
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fmt.Println(err)
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return
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}
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filter.AddShaHash(txHash)
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// Show that the filter matches.
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matches := filter.Matches(txHash.Bytes())
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fmt.Println("Filter Matches?:", matches)
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// Output:
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// Filter Matches?: true
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}
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