How to use flushMetrics method of json Package

Best K6 code snippet using json.flushMetrics

receiver_test.go

Source:receiver_test.go Github

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1// Copyright © 2017 Circonus, Inc. <support@circonus.com>2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4//5package receiver6import (7 "bytes"8 "encoding/json"9 "fmt"10 "io/ioutil"11 "strings"12 "testing"13 "github.com/circonus-labs/circonus-agent/internal/tags"14 "github.com/rs/zerolog"15)16func TestFlush(t *testing.T) {17 t.Log("Testing Flush")18 zerolog.SetGlobalLevel(zerolog.Disabled)19 t.Log("\tno metrics")20 {21 m := Flush()22 if len(*m) != 0 {23 t.Fatalf("expected 0 metrics, got %d", len(*m))24 }25 }26 t.Log("\tw/metric(s)")27 {28 err := initCGM()29 if err != nil {30 t.Fatalf("expected no error, got %s", err)31 }32 metrics.SetText("test", "test")33 m := Flush()34 if len(*m) != 1 {35 t.Fatalf("expected 1 metric, got %d", len(*m))36 }37 }38}39func TestParse(t *testing.T) {40 t.Log("Testing Parse")41 zerolog.SetGlobalLevel(zerolog.Disabled)42 err := initCGM()43 if err != nil {44 t.Fatalf("expected no error, got %s", err)45 }46 t.Log("\tinvalid json (no data)")47 {48 data := []byte{}49 r := ioutil.NopCloser(bytes.NewReader(data))50 expectedErr := fmt.Errorf("parsing json for test: EOF") //nolint:goerr11351 err := Parse("test", r)52 if err == nil {53 t.Fatal("expected error")54 }55 if err.Error() != expectedErr.Error() {56 t.Fatalf("expected (%s) got (%s)", expectedErr, err)57 }58 }59 t.Log("\tinvalid json (blank)")60 {61 data := []byte("")62 r := ioutil.NopCloser(bytes.NewReader(data))63 expectedErr := fmt.Errorf("parsing json for test: EOF") //nolint:goerr11364 err := Parse("test", r)65 if err == nil {66 t.Fatal("expected error")67 }68 if err.Error() != expectedErr.Error() {69 t.Fatalf("expected (%s) got (%s)", expectedErr, err)70 }71 }72 t.Log("\tinvalid json (syntax)")73 {74 data := []byte("{")75 r := ioutil.NopCloser(bytes.NewReader(data))76 expectedErr := fmt.Errorf("parsing json for test: unexpected EOF") //nolint:goerr11377 err := Parse("test", r)78 if err == nil {79 t.Fatal("expected error")80 }81 if err.Error() != expectedErr.Error() {82 t.Fatalf("expected (%s) got (%s)", expectedErr, err)83 }84 }85 t.Log("\tinvalid json (syntax)")86 {87 data := []byte(`{"test": }`)88 r := ioutil.NopCloser(bytes.NewReader(data))89 expectedErr := fmt.Errorf("id:test - offset 10 -- invalid character '}' looking for beginning of value") //nolint:goerr11390 err := Parse("test", r)91 if err == nil {92 t.Fatal("expected error")93 }94 if err.Error() != expectedErr.Error() {95 t.Fatalf("expected (%s) got (%s)", expectedErr, err)96 }97 }98 t.Log("\tno metrics")99 {100 data := []byte("{}")101 r := ioutil.NopCloser(bytes.NewReader(data))102 err := Parse("test", r)103 if err != nil {104 t.Fatalf("expected NO error, got (%s)", err)105 }106 m := metrics.FlushMetrics()107 if len(*m) != 0 {108 t.Fatalf("expected no metrics, got %#v", metrics)109 }110 }111 baseTags := tags.Tags{112 tags.Tag{Category: "source", Value: "circonus-agent"},113 tags.Tag{Category: "collector", Value: "write"},114 tags.Tag{Category: "collector_id", Value: "testg"},115 }116 metricName := tags.MetricNameWithStreamTags("test", baseTags)117 t.Log("\ttype 'i' int32")118 {119 data := []byte(`{"test": {"_type": "i", "_value": 1}}`)120 r := ioutil.NopCloser(bytes.NewReader(data))121 err := Parse("testg", r)122 if err != nil {123 t.Fatalf("expected NO error, got (%s)", err)124 }125 m := metrics.FlushMetrics()126 testMetric, ok := (*m)[metricName]127 if !ok {128 t.Fatalf("expected metric '%s', got (%v)", metricName, m)129 }130 if testMetric.Value.(int32) != int32(1) {131 t.Fatalf("expected 1 got %v", testMetric.Value)132 }133 }134 t.Log("\ttype 'I' uint32")135 {136 data := []byte(`{"test": {"_type": "I", "_value": 1}}`)137 r := ioutil.NopCloser(bytes.NewReader(data))138 err := Parse("testg", r)139 if err != nil {140 t.Fatalf("expected NO error, got (%s)", err)141 }142 m := metrics.FlushMetrics()143 testMetric, ok := (*m)[metricName]144 if !ok {145 t.Fatalf("expected metric 'testg`test', %#v", m)146 }147 if testMetric.Value.(uint32) != uint32(1) {148 t.Fatalf("expected 1 got %v", testMetric.Value)149 }150 }151 t.Log("\ttype 'l' int64")152 {153 data := []byte(`{"test": {"_type": "l", "_value": 1}}`)154 r := ioutil.NopCloser(bytes.NewReader(data))155 err := Parse("testg", r)156 if err != nil {157 t.Fatalf("expected NO error, got (%s)", err)158 }159 m := metrics.FlushMetrics()160 testMetric, ok := (*m)[metricName]161 if !ok {162 t.Fatalf("expected metric 'testg`test', %#v", m)163 }164 if testMetric.Value.(int64) != int64(1) {165 t.Fatalf("expected 1 got %v", testMetric.Value)166 }167 }168 t.Log("\ttype 'L' uint64")169 {170 data := []byte(`{"test": {"_type": "L", "_value": 1}}`)171 r := ioutil.NopCloser(bytes.NewReader(data))172 err := Parse("testg", r)173 if err != nil {174 t.Fatalf("expected NO error, got (%s)", err)175 }176 m := metrics.FlushMetrics()177 testMetric, ok := (*m)[metricName]178 if !ok {179 t.Fatalf("expected metric 'testg`test', %#v", m)180 }181 if testMetric.Value.(uint64) != uint64(1) {182 t.Fatalf("expected 1 got %v", testMetric.Value)183 }184 }185 t.Log("\ttype 'n' float")186 {187 data := []byte(`{"test": {"_type": "n", "_value": 1}}`)188 r := ioutil.NopCloser(bytes.NewReader(data))189 err := Parse("testg", r)190 if err != nil {191 t.Fatalf("expected NO error, got (%s)", err)192 }193 m := metrics.FlushMetrics()194 testMetric, ok := (*m)[metricName]195 if !ok {196 t.Fatalf("expected metric 'testg`test', %#v", m)197 }198 if testMetric.Value.(float64) != float64(1) {199 t.Fatalf("expected 1 got %v", testMetric.Value)200 }201 }202 t.Log("\ttype 'n' float (histogram numeric samples)")203 {204 data := []byte(`{"test": {"_type": "n", "_value": [1]}}`)205 r := ioutil.NopCloser(bytes.NewReader(data))206 err := Parse("testg", r)207 if err != nil {208 t.Fatalf("expected NO error, got (%s)", err)209 }210 m := metrics.FlushMetrics()211 testMetric, ok := (*m)[metricName]212 if !ok {213 t.Fatalf("expected metric 'testg`test', %#v", m)214 }215 if len(testMetric.Value.([]string)) == 0 {216 t.Fatalf("expected at least 1 sample, got %#v", testMetric.Value)217 }218 expect := "[H[1.0e+00]=1]"219 if !strings.Contains(fmt.Sprintf("%v", testMetric.Value), expect) {220 t.Fatalf("expected (%v) got (%v)", expect, testMetric.Value)221 }222 }223 t.Log("\ttype 'n' float (histogram encoded samples)")224 {225 data := []byte(`{"test": {"_type": "n", "_value": ["H[1.2]=1"]}}`)226 r := ioutil.NopCloser(bytes.NewReader(data))227 err := Parse("testg", r)228 if err != nil {229 t.Fatalf("expected NO error, got (%s)", err)230 }231 m := metrics.FlushMetrics()232 testMetric, ok := (*m)[metricName]233 if !ok {234 t.Fatalf("expected metric 'testg`test', %#v", m)235 }236 if len(testMetric.Value.([]string)) == 0 {237 t.Fatalf("expected at least 1 sample, got %#v", testMetric.Value)238 }239 expect := "[H[1.2e+00]=1]"240 if !strings.Contains(fmt.Sprintf("%v", testMetric.Value), expect) {241 t.Fatalf("expected (%v) got (%v)", expect, testMetric.Value)242 }243 }244 t.Log("\ttype 'h' float")245 {246 data := []byte(`{"test": {"_type": "h", "_value": 1}}`)247 r := ioutil.NopCloser(bytes.NewReader(data))248 err := Parse("testg", r)249 if err != nil {250 t.Fatalf("expected NO error, got (%s)", err)251 }252 m := metrics.FlushMetrics()253 testMetric, ok := (*m)[metricName]254 if !ok {255 t.Fatalf("expected metric 'testg`test', %#v", m)256 }257 if testMetric.Value.(float64) != float64(1) {258 t.Fatalf("expected 1 got %v", testMetric.Value)259 }260 }261 t.Log("\ttype 'h' float (histogram numeric samples)")262 {263 data := []byte(`{"test": {"_type": "h", "_value": [1]}}`)264 r := ioutil.NopCloser(bytes.NewReader(data))265 err := Parse("testg", r)266 if err != nil {267 t.Fatalf("expected NO error, got (%s)", err)268 }269 m := metrics.FlushMetrics()270 testMetric, ok := (*m)[metricName]271 if !ok {272 t.Fatalf("expected metric 'testg`test', %#v", m)273 }274 if len(testMetric.Value.([]string)) == 0 {275 t.Fatalf("expected at least 1 sample, got %#v", testMetric.Value)276 }277 expect := "[H[1.0e+00]=1]"278 if !strings.Contains(fmt.Sprintf("%v", testMetric.Value), expect) {279 t.Fatalf("expected (%v) got (%v)", expect, testMetric.Value)280 }281 }282 t.Log("\ttype 'h' float (histogram encoded samples)")283 {284 data := []byte(`{"test": {"_type": "h", "_value": ["H[1.2]=1"]}}`)285 r := ioutil.NopCloser(bytes.NewReader(data))286 err := Parse("testg", r)287 if err != nil {288 t.Fatalf("expected NO error, got (%s)", err)289 }290 m := metrics.FlushMetrics()291 testMetric, ok := (*m)[metricName]292 if !ok {293 t.Fatalf("expected metric 'testg`test', %#v", m)294 }295 if len(testMetric.Value.([]string)) == 0 {296 t.Fatalf("expected at least 1 sample, got %#v", testMetric.Value)297 }298 expect := "[H[1.2e+00]=1]"299 if !strings.Contains(fmt.Sprintf("%v", testMetric.Value), expect) {300 t.Fatalf("expected (%v) got (%v)", expect, testMetric.Value)301 }302 }303 t.Log("\ttype 's' string")304 {305 data := []byte(`{"test": {"_type": "s", "_value": "foo"}}`)306 r := ioutil.NopCloser(bytes.NewReader(data))307 err := Parse("testg", r)308 if err != nil {309 t.Fatalf("expected NO error, got (%s)", err)310 }311 m := metrics.FlushMetrics()312 testMetric, ok := (*m)[metricName]313 if !ok {314 t.Fatalf("expected metric 'testg`test', %#v", m)315 }316 if testMetric.Value.(string) != "foo" {317 t.Fatalf("expected 'foo' got '%v'", testMetric.Value)318 }319 }320 t.Log("\ttype 'z' invalid type")321 {322 data := []byte(`{"test": {"_type": "z", "_value": null}}`)323 r := ioutil.NopCloser(bytes.NewReader(data))324 err := Parse("testg", r)325 if err != nil {326 t.Fatalf("expected NO error, got (%s)", err)327 }328 m := metrics.FlushMetrics()329 testMetric, ok := (*m)[metricName]330 if ok {331 t.Fatalf("expected no metric got, %#v", testMetric)332 }333 }334 t.Log("\twith tags")335 {336 data := []byte(`{"test": {"_tags": ["c1:v1","c2:v2"], "_type": "n", "_value": 1}}`)337 r := ioutil.NopCloser(bytes.NewReader(data))338 err := Parse("testg", r)339 if err != nil {340 t.Fatalf("expected NO error, got (%s)", err)341 }342 var tagList tags.Tags343 tagList = append(tagList, baseTags...)344 tagList = append(tagList, tags.Tags{345 tags.Tag{Category: "c1", Value: "v1"},346 tags.Tag{Category: "c2", Value: "v2"},347 }...)348 mn := tags.MetricNameWithStreamTags("test", tagList)349 m := metrics.FlushMetrics()350 _, ok := (*m)[mn]351 if !ok {352 t.Fatalf("expected metric '%s', %#v", mn, m)353 }354 }355}356func createMetric(t string, v interface{}) tags.JSONMetric {357 // convert native literal types to json then back to358 // simulate parsed values coming in from a POST|PUT359 // iow, what would be _coming_ from receive.Parse()360 m := tags.JSONMetric{Type: t, Value: v}361 b, err := json.Marshal(m)362 if err != nil {363 panic(err)364 }365 if err := json.Unmarshal(b, &m); err != nil {366 panic(err)367 }368 return m369}370func TestParseInt32(t *testing.T) {371 t.Log("Testing parseInt32")372 metricType := "i"373 tt := []struct { //nolint:govet374 Description string375 Value interface{}376 Expect int32377 ShouldFail bool378 }{379 {"valid", 1, int32(1), false},380 {"valid, string", fmt.Sprintf("%v", 1), int32(1), false},381 {"bad conversion", fmt.Sprintf("%v", "1a"), 0, true},382 {"bad data type", []int{1}, 0, true},383 }384 for _, test := range tt {385 t.Logf("\ttesting %s (%#v)", test.Description, test.Value)386 metric := createMetric(metricType, test.Value)387 v := parseInt32("test", metric)388 if test.ShouldFail {389 if v != nil {390 t.Fatalf("expected nil, got (%#v)", v)391 }392 } else {393 if v == nil {394 t.Fatal("expected value")395 return396 }397 if *v != test.Expect {398 t.Fatalf("expected (%#v) got (%#v)", test.Expect, *v)399 }400 }401 }402}403func TestParseUint32(t *testing.T) {404 t.Log("Testing parseUint32")405 metricType := "I"406 tt := []struct { //nolint:govet407 Description string408 Value interface{}409 Expect uint32410 ShouldFail bool411 }{412 {"valid", 1, uint32(1), false},413 {"valid, string", fmt.Sprintf("%v", 1), uint32(1), false},414 {"bad conversion", fmt.Sprintf("%v", "1a"), 0, true},415 {"bad data type", []int{1}, 0, true},416 }417 for _, test := range tt {418 t.Logf("\ttesting %s (%#v)", test.Description, test.Value)419 metric := createMetric(metricType, test.Value)420 v := parseUint32("test", metric)421 if test.ShouldFail {422 if v != nil {423 t.Fatalf("expected nil, got (%#v)", v)424 }425 } else {426 if v == nil {427 t.Fatal("expected value")428 return429 }430 if *v != test.Expect {431 t.Fatalf("expected (%#v) got (%#v)", test.Expect, *v)432 }433 }434 }435}436func TestParseInt64(t *testing.T) {437 t.Log("Testing parseInt64")438 metricType := "l"439 tt := []struct { //nolint:govet440 Description string441 Value interface{}442 Expect int64443 ShouldFail bool444 }{445 {"valid", 1, int64(1), false},446 {"valid, string", fmt.Sprintf("%v", 1), int64(1), false},447 {"bad conversion", fmt.Sprintf("%v", "1a"), 0, true},448 {"bad data type", []int{1}, 0, true},449 }450 for _, test := range tt {451 t.Logf("\ttesting %s (%#v)", test.Description, test.Value)452 metric := createMetric(metricType, test.Value)453 v := parseInt64("test", metric)454 if test.ShouldFail {455 if v != nil {456 t.Fatalf("expected nil, got (%#v)", v)457 }458 } else {459 if v == nil {460 t.Fatal("expected value")461 return462 }463 if *v != test.Expect {464 t.Fatalf("expected (%#v) got (%#v)", test.Expect, *v)465 }466 }467 }468}469func TestParseUint64(t *testing.T) {470 t.Log("Testing parseUint64")471 metricType := "L"472 tt := []struct { //nolint:govet473 Description string474 Value interface{}475 Expect uint64476 ShouldFail bool477 }{478 {"valid", 1, uint64(1), false},479 {"valid, string", fmt.Sprintf("%v", 1), uint64(1), false},480 {"bad conversion", fmt.Sprintf("%v", "1a"), 0, true},481 {"bad data type", []int{1}, 0, true},482 }483 for _, test := range tt {484 t.Logf("\ttesting %s (%#v)", test.Description, test.Value)485 metric := createMetric(metricType, test.Value)486 v := parseUint64("test", metric)487 if test.ShouldFail {488 if v != nil {489 t.Fatalf("expected nil, got (%#v)", v)490 }491 } else {492 if v == nil {493 t.Fatal("expected value")494 return495 }496 if *v != test.Expect {497 t.Fatalf("expected (%#v) got (%#v)", test.Expect, *v)498 }499 }500 }501}502func TestParseFloat(t *testing.T) {503 t.Log("Testing parseFloat")504 metricType := "n"505 tt := []struct { //nolint:govet506 Description string507 Value interface{}508 Expect float64509 ShouldFail bool510 }{511 {"valid1", 1, float64(1), false},512 {"valid2", 1.2, float64(1.2), false},513 {"valid, string1", fmt.Sprintf("%v", 1), float64(1), false},514 {"valid, string2", fmt.Sprintf("%v", 1.2), float64(1.2), false},515 {"bad conversion", fmt.Sprintf("%v", "1a"), 0, true},516 {"bad data type", true, 0, true},517 }518 for _, test := range tt {519 t.Logf("\ttesting %s (%#v)", test.Description, test.Value)520 metric := createMetric(metricType, test.Value)521 v, isHist := parseFloat("test", metric)522 if isHist {523 t.Fatal("not expecting histogram")524 }525 if test.ShouldFail {526 if v != nil {527 t.Fatalf("expected nil, got (%#v)", v)528 }529 } else {530 if v == nil {531 t.Fatal("expected value")532 return533 }534 if *v != test.Expect {535 t.Fatalf("expected (%#v) got (%#v)", test.Expect, *v)536 }537 }538 }539}540func TestParseHistogram(t *testing.T) {541 t.Log("Testing parseHistogram")542 metricType := "n"543 tt := []struct {544 Description string545 Value interface{}546 Expect []histSample547 ShouldFail bool548 }{549 {"valid1", []float64{1}, []histSample{{bucket: false, count: 0, value: 1}}, false},550 {"valid2", []float64{1.2}, []histSample{{bucket: false, count: 0, value: 1.2}}, false},551 {"valid hist", []string{"H[1.2]=1"}, []histSample{{bucket: true, count: 1, value: 1.2}}, false},552 {"valid, string1", []string{fmt.Sprintf("%v", 1)}, []histSample{{bucket: false, count: 0, value: 1}}, false},553 {"valid, string2", []string{fmt.Sprintf("%v", 1.2)}, []histSample{{bucket: false, count: 0, value: 1.2}}, false},554 {"bad conversion", []string{fmt.Sprintf("%v", "1a")}, []histSample{}, true},555 {"bad data type - metric", true, []histSample{}, true},556 {"bad data type - metric sample", []bool{true}, []histSample{}, true},557 {"bad hist val", []string{"H[1.2b]=1"}, []histSample{}, true},558 {"bad hist cnt", []string{"H[1.2]=1b"}, []histSample{}, true},559 }560 for _, test := range tt {561 t.Logf("\ttesting %s (%#v)", test.Description, test.Value)562 metric := createMetric(metricType, test.Value)563 v := parseHistogram("test", metric)564 if test.ShouldFail {565 if v != nil {566 t.Fatalf("expected nil, got (%#v)", v)567 }568 } else {569 if v == nil {570 t.Fatal("expected value")571 return572 }573 if fmt.Sprintf("%v", *v) != fmt.Sprintf("%v", test.Expect) {574 t.Fatalf("expected (%#v) got (%#v)", test.Expect, *v)575 }576 }577 }578}...

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output.go

Source:output.go Github

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...54 return nil55}56func (o *Output) Start() error {57 o.logger.Debug("Starting...")58 pf, err := output.NewPeriodicFlusher(o.config.PushInterval, o.flushMetrics)59 if err != nil {60 return err61 }62 o.logger.Debug("Started!")63 o.periodicFlusher = pf64 return nil65}66func (o *Output) flushMetrics() {67 samples := o.GetBufferedSamples()68 start := time.Now()69 var count int70 bulkRequest := o.esClient.Bulk()71 for _, sc := range samples {72 samples := sc.GetSamples()73 count += len(samples)74 for _, sample := range samples {75 esSample := XK6ElasticSample{76 Name: sample.Metric.Name,77 Type: sample.Metric.Type.String(),78 Tags: sample.Tags.CloneTags(),79 Timestamp: sample.Time.UnixMilli(),80 Value: sample.Value,...

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flushMetrics

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1import (2func main() {3 var jsonBlob = []byte(`[4 {"Name": "Platypus", "Order": "Monotremata"},5 {"Name": "Quoll", "Order": "Dasyuromorphia"}6 type Animal struct {7 }8 err := json.Unmarshal(jsonBlob, &animals)9 if err != nil {10 fmt.Println("error:", err)11 }12 fmt.Printf("%+v", animals)13}14import (15func main() {16 var jsonBlob = []byte(`[17 {"Name": "Platypus", "Order": "Monotremata"},18 {"Name": "Quoll", "Order": "Dasyuromorphia"}19 type Animal struct {20 }21 err := json.Unmarshal(jsonBlob, &animals)22 if err != nil {23 fmt.Println("error:", err)24 }25 fmt.Printf("%+v", animals)26}27import (28func main() {29 var jsonBlob = []byte(`[30 {"Name": "Platypus", "Order": "Monotremata"},31 {"Name": "Quoll", "Order": "Dasyuromorphia"}32 type Animal struct {33 }34 err := json.Unmarshal(jsonBlob, &animals)35 if err != nil {36 fmt.Println("error:", err)37 }38 fmt.Printf("%+v", animals)39}

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flushMetrics

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1import (2type Person struct {3}4func main() {5 p1 := Person{"James", 20}6 p2 := Person{"Moneypenny", 18}7 people := []Person{p1, p2}8 fmt.Println(people)9 bs, _ := json.Marshal(people)10 fmt.Println(string(bs))11}12import (13type Person struct {14}15func main() {16 p1 := Person{"James", 20}17 p2 := Person{"Moneypenny", 18}18 people := []Person{p1, p2}19 fmt.Println(people)20 bs, _ := json.Marshal(people)21 fmt.Println(bs)22}23import (24type Person struct {25}26func main() {27 p1 := Person{"James", 20}28 p2 := Person{"Moneypenny", 18}29 people := []Person{p1, p2}30 fmt.Println(people)31 bs, _ := json.Marshal(people)32 fmt.Printf("%T \n", bs)33 fmt.Println(bs)34}35import (36type Person struct {37}38func main() {39 p1 := Person{"James", 20}40 p2 := Person{"Moneypenny", 18}41 people := []Person{p1, p2}42 fmt.Println(people)43 bs, _ := json.Marshal(people)44 fmt.Printf("%T \n", bs)45 fmt.Println(bs)46 for i, v := range bs {47 fmt.Printf("at index position %d we have hex %#x \n", i, v)48 }49}50import (51type Person struct {52}53func main() {54 p1 := Person{"James", 20}55 p2 := Person{"

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flushMetrics

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1import (2type Person struct {3}4func main() {5 p := Person{Name: "Alice", Age: 20}6 fmt.Printf("%#v7 b, err := json.Marshal(p)8 if err != nil {9 fmt.Println("error:", err)10 }11 fmt.Println(string(b))12 err = json.Unmarshal(b, &p2)13 if err != nil {14 fmt.Println("error:", err)15 }16 fmt.Printf("%#v17}18main.Person{Name:"Alice", Age:20}19{"Name":"Alice","Age":20}20main.Person{Name:"Alice", Age:20}

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flushMetrics

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1import (2type Person struct {3}4func main() {5 enc := json.NewEncoder(os.Stdout)6 enc.Encode(Person{"Bob", 20, "123 Main Street"})7 enc.Encode(Person{"Alice", 30, "456 Broadway"})8 enc.Encode(Person{"Alice", 30, "456 Broadway"})9}10{"Name":"Bob","Age":20,"Address":"123 Main Street"}11{"Name":"Alice","Age":30,"Address":"456 Broadway"}12{"Name":"Alice","Age":30,"Address":"456 Broadway"}13import (14type Person struct {15}16func main() {17 enc := json.NewEncoder(os.Stdout)18 enc.Encode(Person{"Bob", 20, "123 Main Street"})19 enc.Encode(Person{"Alice", 30, "456 Broadway"})20 enc.Encode(Person{"Alice", 30, "456 Broadway"})21}22{"Name":"Bob","Age":20,"Address":"123 Main Street"}23{"Name":"Alice","Age":30,"Address":"456 Broadway"}24{"Name":"Alice","Age":30,"Address":"456 Broadway"}25import (26type Person struct {27}28func main() {29 enc := json.NewEncoder(os.Stdout)30 enc.Encode(Person{"Bob", 20

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flushMetrics

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1import (2func main() {3 file, err := os.Open("sample.txt")4 if err != nil {5 fmt.Println("Error opening file:", err)6 }7 defer file.Close()8 scanner := bufio.NewScanner(file)9 for scanner.Scan() {10 }11 if err := scanner.Err(); err != nil {12 fmt.Println("Error reading file:", err)13 }14}15import (16func main() {17 file, err := os.Open("sample.txt")18 if err != nil {19 fmt.Println("Error opening file:", err)20 }21 defer file.Close()22 reader := bufio.NewReader(file)23 line, err := reader.ReadString('24 for err == nil {25 fmt.Println(line)26 line, err = reader.ReadString('27 }28 if err != nil {29 fmt.Println(err)30 }31}32import (33func main() {34 file, err := os.Open("sample.txt")35 if err != nil {36 fmt.Println("Error opening file:", err)37 }38 defer file.Close()39 scanner := bufio.NewScanner(file)40 for scanner.Scan() {41 }42 if err := scanner.Err(); err != nil {43 fmt.Println("Error reading file:", err)44 }45}

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flushMetrics

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1import (2func main() {3 enc := json.NewEncoder(os.Stdout)4 enc.Encode(map[string]int{"apple": 5, "lettuce": 7})5 dec := json.NewDecoder(bytes.NewBufferString(`{"apple": 5, "lettuce": 7}`))6 dec.Decode(&data)7 fmt.Println(data)8 enc = json.NewEncoder(os.Stdout)9 enc.Encode(map[string]int{"apple": 5, "lettuce": 7})10 dec = json.NewDecoder(bytes.NewBufferString(`{"apple": 5, "lettuce": 7}`))11 dec.Decode(&data)12 fmt.Println(data)13}14{"apple":5,"lettuce":7}15{"apple":5,"lettuce":7}

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flushMetrics

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1import (2type Metrics struct {3}4func recordMetrics(duration int, status int, method string, path string) {5 metrics = append(metrics, Metrics{6 })7}8func flushMetrics() []Metrics {9}10func main() {11 http.HandleFunc("/metrics", func(w http.ResponseWriter, r *http.Request) {12 metrics := flushMetrics()13 if err := json.NewEncoder(w).Encode(metrics); err != nil {14 http.Error(w, err.Error(), http.StatusInternalServerError)15 }16 })17 http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {18 start := time.Now()19 defer func() {20 recordMetrics(int(time.Since(start).Milliseconds()), 200, r.Method, r.URL.Path)21 }()22 fmt.Fprintf(w, "Hello, %q", r.URL.Path)23 })24 log.Fatal(http.ListenAndServe(":8080", nil))25}26[{"duration":0,"status":200,"method":"GET","path":"/"}]

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