telegraf/plugins/inputs/bcache/bcache_test.go

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package bcache
import (
"io/ioutil"
"os"
"testing"
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"github.com/influxdata/telegraf/testutil"
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"github.com/stretchr/testify/require"
)
const (
dirty_data = "1.5G"
bypassed = "4.7T"
cache_bypass_hits = "146155333"
cache_bypass_misses = "0"
cache_hit_ratio = "90"
cache_hits = "511469583"
cache_miss_collisions = "157567"
cache_misses = "50616331"
cache_readaheads = "2"
)
var (
testBcachePath = os.TempDir() + "/telegraf/sys/fs/bcache"
testBcacheUuidPath = testBcachePath + "/663955a3-765a-4737-a9fd-8250a7a78411"
testBcacheDevPath = os.TempDir() + "/telegraf/sys/devices/virtual/block/bcache0"
testBcacheBackingDevPath = os.TempDir() + "/telegraf/sys/devices/virtual/block/md10"
)
func TestBcacheGeneratesMetrics(t *testing.T) {
err := os.MkdirAll(testBcacheUuidPath, 0755)
require.NoError(t, err)
err = os.MkdirAll(testBcacheDevPath, 0755)
require.NoError(t, err)
err = os.MkdirAll(testBcacheBackingDevPath+"/bcache", 0755)
require.NoError(t, err)
err = os.Symlink(testBcacheBackingDevPath+"/bcache", testBcacheUuidPath+"/bdev0")
require.NoError(t, err)
err = os.Symlink(testBcacheDevPath, testBcacheUuidPath+"/bdev0/dev")
require.NoError(t, err)
err = os.MkdirAll(testBcacheUuidPath+"/bdev0/stats_total", 0755)
require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/dirty_data",
[]byte(dirty_data), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/bypassed",
[]byte(bypassed), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_bypass_hits",
[]byte(cache_bypass_hits), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_bypass_misses",
[]byte(cache_bypass_misses), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_hit_ratio",
[]byte(cache_hit_ratio), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_hits",
[]byte(cache_hits), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_miss_collisions",
[]byte(cache_miss_collisions), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_misses",
[]byte(cache_misses), 0644)
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require.NoError(t, err)
err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_readaheads",
[]byte(cache_readaheads), 0644)
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require.NoError(t, err)
fields := map[string]interface{}{
"dirty_data": uint64(1610612736),
"bypassed": uint64(5167704440832),
"cache_bypass_hits": uint64(146155333),
"cache_bypass_misses": uint64(0),
"cache_hit_ratio": uint64(90),
"cache_hits": uint64(511469583),
"cache_miss_collisions": uint64(157567),
"cache_misses": uint64(50616331),
"cache_readaheads": uint64(2),
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}
tags := map[string]string{
"backing_dev": "md10",
"bcache_dev": "bcache0",
}
var acc testutil.Accumulator
// all devs
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b := &Bcache{BcachePath: testBcachePath}
err = b.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t, "bcache", fields, tags)
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// one exist dev
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b = &Bcache{BcachePath: testBcachePath, BcacheDevs: []string{"bcache0"}}
err = b.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t, "bcache", fields, tags)
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err = os.RemoveAll(os.TempDir() + "/telegraf")
require.NoError(t, err)
}