How to use newExecutionSegment method of lib Package

Best K6 code snippet using lib.newExecutionSegment

execution_segment.go

Source:execution_segment.go Github

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...68 }69 if to.Cmp(oneRat) > 0 {70 return nil, fmt.Errorf("segment end value shouldn't be more than 1 but was %s", to.FloatString(2))71 }72 return newExecutionSegment(from, to), nil73}74// newExecutionSegment just creates an ExecutionSegment without validating the arguments75func newExecutionSegment(from, to *big.Rat) *ExecutionSegment {76 return &ExecutionSegment{77 from: from,78 to: to,79 length: new(big.Rat).Sub(to, from),80 }81}82// stringToRat is a helper function that tries to convert a string to a rational83// number while allowing percentage, decimal, and fraction values.84func stringToRat(s string) (*big.Rat, error) {85 if strings.HasSuffix(s, "%") {86 num, ok := new(big.Int).SetString(strings.TrimSuffix(s, "%"), 10)87 if !ok {88 return nil, fmt.Errorf("'%s' is not a valid percentage", s)89 }90 return new(big.Rat).SetFrac(num, big.NewInt(100)), nil91 }92 rat, ok := new(big.Rat).SetString(s)93 if !ok {94 return nil, fmt.Errorf("'%s' is not a valid percentage, decimal, fraction or interval value", s)95 }96 return rat, nil97}98// NewExecutionSegmentFromString validates the supplied string value and returns99// the newly created ExecutionSegment or and error from it.100//101// We are able to parse both single percentage/float/fraction values, and actual102// (from: to] segments. For the single values, we just treat them as the103// beginning segment - thus the execution segment can be used as a shortcut for104// quickly running an arbitrarily scaled-down version of a test.105//106// The parsing logic is that values with a colon, i.e. ':', are full segments:107// `1/2:3/4`, `0.5:0.75`, `50%:75%`, and even `2/4:75%` should be (1/2, 3/4]108// And values without a colon are the end of a first segment:109// `20%`, `0.2`, and `1/5` should be converted to (0, 1/5]110// empty values should probably be treated as "1", i.e. the whole execution111func NewExecutionSegmentFromString(toStr string) (result *ExecutionSegment, err error) {112 from := zeroRat113 if toStr == "" {114 toStr = "1" // an empty string means a full 0:1 execution segment115 }116 if strings.ContainsRune(toStr, ':') {117 fromToStr := strings.SplitN(toStr, ":", 2)118 toStr = fromToStr[1]119 if from, err = stringToRat(fromToStr[0]); err != nil {120 return nil, err121 }122 }123 to, err := stringToRat(toStr)124 if err != nil {125 return nil, err126 }127 return NewExecutionSegment(from, to)128}129// UnmarshalText implements the encoding.TextUnmarshaler interface, so that130// execution segments can be specified as CLI flags, environment variables, and131// JSON strings. It is a wrapper for the NewExecutionFromString() constructor.132func (es *ExecutionSegment) UnmarshalText(text []byte) (err error) {133 segment, err := NewExecutionSegmentFromString(string(text))134 if err != nil {135 return err136 }137 *es = *segment138 return nil139}140func (es *ExecutionSegment) String() string {141 if es == nil {142 return "0:1"143 }144 return es.from.RatString() + ":" + es.to.RatString()145}146// MarshalText implements the encoding.TextMarshaler interface, so is used for147// text and JSON encoding of the execution segment.148func (es *ExecutionSegment) MarshalText() ([]byte, error) {149 if es == nil {150 return nil, nil151 }152 return []byte(es.String()), nil153}154// FloatLength is a helper method for getting some more human-readable155// information about the execution segment.156func (es *ExecutionSegment) FloatLength() float64 {157 if es == nil {158 return 1.0159 }160 res, _ := es.length.Float64()161 return res162}163// Split evenly divides the execution segment into the specified number of164// equal consecutive execution sub-segments.165func (es *ExecutionSegment) Split(numParts int64) ([]*ExecutionSegment, error) {166 if numParts < 1 {167 return nil, fmt.Errorf("the number of parts should be at least 1, %d received", numParts)168 }169 from, to := zeroRat, oneRat170 if es != nil {171 from, to = es.from, es.to172 }173 increment := new(big.Rat).Sub(to, from)174 increment.Denom().Mul(increment.Denom(), big.NewInt(numParts))175 results := make([]*ExecutionSegment, numParts)176 for i := int64(0); i < numParts; i++ {177 segmentTo := new(big.Rat).Add(from, increment)178 segment, err := NewExecutionSegment(from, segmentTo)179 if err != nil {180 return nil, err181 }182 results[i] = segment183 from = segmentTo184 }185 if from.Cmp(to) != 0 {186 return nil, fmt.Errorf("expected %s and %s to be equal", from, to)187 }188 return results, nil189}190// Equal returns true only if the two execution segments have the same from and191// to values.192func (es *ExecutionSegment) Equal(other *ExecutionSegment) bool {193 if es == other {194 return true195 }196 thisFrom, otherFrom, thisTo, otherTo := zeroRat, zeroRat, oneRat, oneRat197 if es != nil {198 thisFrom, thisTo = es.from, es.to199 }200 if other != nil {201 otherFrom, otherTo = other.from, other.to202 }203 return thisFrom.Cmp(otherFrom) == 0 && thisTo.Cmp(otherTo) == 0204}205// SubSegment returns a new execution sub-segment - if a is (1/2:1] and b is206// (0:1/2], then a.SubSegment(b) will return a new segment (1/2, 3/4].207//208// The basic formula for c = a.SubSegment(b) is:209// c.from = a.from + b.from * (a.to - a.from)210// c.to = c.from + (b.to - b.from) * (a.to - a.from)211func (es *ExecutionSegment) SubSegment(child *ExecutionSegment) *ExecutionSegment {212 if child == nil {213 return es // 100% sub-segment is the original segment214 }215 parentFrom, parentLength := zeroRat, oneRat216 if es != nil {217 parentFrom, parentLength = es.from, es.length218 }219 resultFrom := new(big.Rat).Mul(parentLength, child.from)220 resultFrom.Add(resultFrom, parentFrom)221 resultLength := new(big.Rat).Mul(parentLength, child.length)222 return &ExecutionSegment{223 from: resultFrom,224 length: resultLength,225 to: new(big.Rat).Add(resultFrom, resultLength),226 }227}228// helper function for rounding (up) of rational numbers to big.Int values229func roundUp(rat *big.Rat) *big.Int {230 quo, rem := new(big.Int).QuoRem(rat.Num(), rat.Denom(), new(big.Int))231 if rem.Mul(rem, twoBigInt).Cmp(rat.Denom()) >= 0 {232 return quo.Add(quo, oneBigInt)233 }234 return quo235}236// Scale proportionally scales the supplied value, according to the execution237// segment's position and size of the work.238func (es *ExecutionSegment) Scale(value int64) int64 {239 if es == nil { // no execution segment, i.e. 100%240 return value241 }242 // Instead of the first proposal that used remainders and floor:243 // floor( (value * from) % 1 + value * length )244 // We're using an alternative approach with rounding that (hopefully) has245 // the same properties, but it's simpler and has better precision:246 // round( (value * from) - round(value * from) + (value * (to - from)) )?247 // which reduces to:248 // round( (value * to) - round(value * from) )?249 toValue := big.NewRat(value, 1)250 toValue.Mul(toValue, es.to)251 fromValue := big.NewRat(value, 1)252 fromValue.Mul(fromValue, es.from)253 toValue.Sub(toValue, new(big.Rat).SetFrac(roundUp(fromValue), oneBigInt))254 return roundUp(toValue).Int64()255}256// InPlaceScaleRat scales rational numbers in-place - it changes the passed257// argument (and also returns it, to allow for chaining, like many other big.Rat258// methods).259func (es *ExecutionSegment) InPlaceScaleRat(value *big.Rat) *big.Rat {260 if es == nil { // no execution segment, i.e. 100%261 return value262 }263 return value.Mul(value, es.length)264}265// CopyScaleRat scales rational numbers without changing them - creates a new266// bit.Rat object and uses it for the calculation.267func (es *ExecutionSegment) CopyScaleRat(value *big.Rat) *big.Rat {268 if es == nil { // no execution segment, i.e. 100%269 return value270 }271 return new(big.Rat).Mul(value, es.length)272}273// ExecutionSegmentSequence represents an ordered chain of execution segments,274// where the end of one segment is the beginning of the next. It can serialized275// as a comma-separated string of rational numbers "r1,r2,r3,...,rn", which276// represents the sequence (r1, r2], (r2, r3], (r3, r4], ..., (r{n-1}, rn].277// The empty value should be treated as if there is a single (0, 1] segment.278type ExecutionSegmentSequence []*ExecutionSegment279// NewExecutionSegmentSequence validates the that the supplied execution280// segments are non-overlapping and without gaps. It will return a new execution281// segment sequence if that is true, and an error if it's not.282func NewExecutionSegmentSequence(segments ...*ExecutionSegment) (ExecutionSegmentSequence, error) {283 if len(segments) > 1 {284 to := segments[0].to285 for i, segment := range segments[1:] {286 if segment.from.Cmp(to) != 0 {287 return nil, fmt.Errorf(288 "the start value %s of segment #%d should be equal to the end value of the previous one, but it is %s",289 segment.from, i+1, to,290 )291 }292 to = segment.to293 }294 }295 return ExecutionSegmentSequence(segments), nil296}297// NewExecutionSegmentSequenceFromString parses strings of the format298// "r1,r2,r3,...,rn", which represents the sequences like (r1, r2], (r2, r3],299// (r3, r4], ..., (r{n-1}, rn].300func NewExecutionSegmentSequenceFromString(strSeq string) (ExecutionSegmentSequence, error) {301 if len(strSeq) == 0 {302 return nil, nil303 }304 points := strings.Split(strSeq, ",")305 if len(points) < 2 {306 return nil, fmt.Errorf("at least 2 points are needed for an execution segment sequence, %d given", len(points))307 }308 var start *big.Rat309 segments := make([]*ExecutionSegment, 0, len(points)-1)310 for i, point := range points {311 rat, err := stringToRat(point)312 if err != nil {313 return nil, err314 }315 if i == 0 {316 start = rat317 continue318 }319 segment, err := NewExecutionSegment(start, rat)320 if err != nil {321 return nil, err322 }323 segments = append(segments, segment)324 start = rat325 }326 return NewExecutionSegmentSequence(segments...)327}328// UnmarshalText implements the encoding.TextUnmarshaler interface, so that329// execution segment sequences can be specified as CLI flags, environment330// variables, and JSON strings.331func (ess *ExecutionSegmentSequence) UnmarshalText(text []byte) (err error) {332 seq, err := NewExecutionSegmentSequenceFromString(string(text))333 if err != nil {334 return err335 }336 *ess = seq337 return nil338}339// MarshalText implements the encoding.TextMarshaler interface, so is used for340// text and JSON encoding of the execution segment sequences.341func (ess ExecutionSegmentSequence) MarshalText() ([]byte, error) {342 return []byte(ess.String()), nil343}344// String just implements the fmt.Stringer interface, encoding the sequence of345// segments as "start1,end1,end2,end3,...,endn".346func (ess ExecutionSegmentSequence) String() string {347 result := make([]string, 0, len(ess)+1)348 for i, s := range ess {349 if i == 0 {350 result = append(result, s.from.RatString())351 }352 result = append(result, s.to.RatString())353 }354 return strings.Join(result, ",")355}356// LCD calculates the lowest common denominator of the sequence.357// https://en.wikipedia.org/wiki/Least_common_multiple#Using_the_greatest_common_divisor358func (ess ExecutionSegmentSequence) LCD() int64 {359 acc := ess[0].length.Denom().Int64()360 var n int64361 for _, seg := range ess[1:] {362 n = seg.length.Denom().Int64()363 if acc == n || acc%n == 0 { // short circuit364 continue365 }366 acc *= (n / gcd(acc, n))367 }368 return acc369}370// Greatest common divisor371// https://en.wikipedia.org/wiki/Euclidean_algorithm372func gcd(a, b int64) int64 {373 for a != b {374 if a > b {375 a -= b376 } else {377 b -= a378 }379 }380 return a381}382// IsFull returns whether the sequences is full, that is, whether it starts at 0383// and ends at 1. Use GetFilledExecutionSegmentSequence() to get a full sequence.384func (ess ExecutionSegmentSequence) IsFull() bool {385 return ess != nil && len(ess) != 0 && ess[0].from.Cmp(zeroRat) == 0 && ess[len(ess)-1].to.Cmp(oneRat) == 0386}387// FindSegmentPosition returns the index of the supplied execution segment in388// the sequence, or an error if the segment isn't present. This shouldn't be389// used on a nil or empty sequence, it's best to use this method on the result390// of GetFilledExecutionSegmentSequence().391func (ess ExecutionSegmentSequence) FindSegmentPosition(segment *ExecutionSegment) (int, error) {392 from := zeroRat393 if segment != nil {394 from = segment.from395 }396 index := sort.Search(len(ess), func(i int) bool {397 return ess[i].from.Cmp(from) >= 0398 })399 if index < 0 || index >= len(ess) || !ess[index].Equal(segment) {400 return -1, fmt.Errorf("couldn't find segment %s in sequence %s", segment, ess)401 }402 return index, nil403}404// GetFilledExecutionSegmentSequence makes sure we don't have any gaps in the405// given execution segment sequence, or a nil one. It makes sure that the whole406// 0-1 range is filled.407func GetFilledExecutionSegmentSequence(408 sequence *ExecutionSegmentSequence, fallback *ExecutionSegment,409) (result ExecutionSegmentSequence) {410 if sequence == nil || len(*sequence) == 0 {411 if fallback == nil || fallback.length.Cmp(oneRat) == 0 {412 // There is no sequence or a segment, so it means the whole test run413 // is being planned/executed. So we make sure not to have a nil414 // sequence, returning a full; "0,1" sequence instead, otherwise we415 // will need to check for nil everywhere...416 return ExecutionSegmentSequence{newExecutionSegment(zeroRat, oneRat)}417 }418 // We don't have a sequence, but we have a defined segment, so we419 // fill around it with the missing pieces for a full sequence.420 result = ExecutionSegmentSequence{fallback}421 } else {422 result = *sequence423 }424 if result[0].from.Cmp(zeroRat) != 0 {425 es := newExecutionSegment(zeroRat, result[0].from)426 result = append(ExecutionSegmentSequence{es}, result...)427 }428 if result[len(result)-1].to.Cmp(oneRat) != 0 {429 es := newExecutionSegment(result[len(result)-1].to, oneRat)430 result = append(result, es)431 }432 return result433}434// ExecutionSegmentSequenceWrapper is a caching layer on top of the execution435// segment sequence that allows us to make fast and useful calculations, after436// a somewhat slow initialization.437type ExecutionSegmentSequenceWrapper struct {438 ExecutionSegmentSequence // a filled-out segment sequence439 lcd int64 // pre-calculated least common denominator440 // The striped offsets, i.e. the repeating indexes that "belong" to each441 // execution segment in the sequence.442 offsets [][]int64443}444// NewExecutionSegmentSequenceWrapper expects a filled-out execution segment445// sequence. It pre-calculates the initial caches of and returns a new446// ExecutionSegmentSequenceWrapper, but doesn't calculate the striped offsets.447func NewExecutionSegmentSequenceWrapper(ess ExecutionSegmentSequence) *ExecutionSegmentSequenceWrapper {448 if !ess.IsFull() {449 panic(fmt.Sprintf("Cannot wrap around a non-full execution segment sequence '%s'", ess))450 }451 sequenceLength := len(ess)452 offsets := make([][]int64, sequenceLength)453 lcd := ess.LCD()454 // This will contain the normalized numerator values (i.e. what they would have455 // been if all denominators were equal to the LCD), sorted in descending456 // order (i.e. biggest segments are first), with references to their actual457 // indexes in the execution segment sequence (i.e. `seq` above).458 sortedNormalizedIndexes := make([]struct {459 normNumerator int64460 originalIndex int461 }, sequenceLength)462 for i := range ess {463 normalizedNumerator := ess[i].length.Num().Int64() * (lcd / ess[i].length.Denom().Int64())464 sortedNormalizedIndexes[i].normNumerator = normalizedNumerator465 sortedNormalizedIndexes[i].originalIndex = i466 offsets[i] = make([]int64, 0, normalizedNumerator+1)467 }468 sort.SliceStable(sortedNormalizedIndexes, func(i, j int) bool {469 return sortedNormalizedIndexes[i].normNumerator > sortedNormalizedIndexes[j].normNumerator470 })471 // This is the striping algorithm. Imagine you have a number of rational472 // numbers which all add up to 1 (or less), and call them segments. If you473 // want each to get proportional amount of anything, you need to give them474 // their numerator count of elements for each denominator amount from the475 // original elements. So, for 1/3, you give 1 element for each 3 elements.476 // For 3/5 - 3 elements for each 5. If you have, for example, a sequence477 // with elements with length 3/5 and 1/3, in order to know how to distribute478 // it accurately, you need to get the LCD(lowest common denominitor). In479 // this case, between 3 and 5, the LCD is 15. Then to transform the numbers480 // to have the same, LCD equal, denominator. So 3/5 becomes 9/15 and 1/3481 // becomes 5/15. So now for each 15 elements 9 need to go to the 3/5, and 5482 // need to go to 1/3. This is what we did above in sortedNormalizedIndexes.483 //484 // We use the algorithm below to split elements between ExecutionSegments by485 // using their length as the rational number. As we would like to get486 // non-sequential elements, we try to get the maximum distance between them.487 // That is the number of elements divided by the number of elements for any488 // given segment, which concidently is the length of the segment reversed.489 // The algorithm below does the following:490 // 1. Goes through the elements from 0 to the lcd-1491 // 2. For each of element, it goes through the segments and looks if the492 // amount of already taken elements by the given segment, multiplied by493 // that segment's length inverted, is equal to or less to the current494 // element index. If it is, give that element to that segment. If not,495 // continue with the next element.496 // The code below specifically avoids using big.Rat, for performance497 // reasons, which complicates the code somewhat. As additional note, the498 // sorting of the segments from biggest to smallest helps with the fact that499 // the biggest elements will need to take the most elements, and for them it500 // will be the hardest to not get sequential elements.501 prev := make([]int64, sequenceLength)502 chosenCounts := make([]int64, sequenceLength)503 saveIndex := func(iteration int64, index int, numerator int64) {504 offsets[index] = append(offsets[index], iteration-prev[index])505 prev[index] = iteration506 if int64(len(offsets[index])) == numerator {507 offsets[index] = append(offsets[index], offsets[index][0]+lcd-iteration)508 }509 }510 for i := int64(0); i < lcd; i++ {511 for sortedIndex, chosenCount := range chosenCounts {512 num := chosenCount * lcd513 denom := sortedNormalizedIndexes[sortedIndex].normNumerator514 if i > num/denom || (i == num/denom && num%denom == 0) {515 chosenCounts[sortedIndex]++516 saveIndex(i, sortedNormalizedIndexes[sortedIndex].originalIndex, denom)517 break518 }519 }520 }521 return &ExecutionSegmentSequenceWrapper{ExecutionSegmentSequence: ess, lcd: lcd, offsets: offsets}522}523// LCD returns the (cached) least common denominator of the sequence - no need524// to calculate it again, since we did it in the constructor.525func (essw *ExecutionSegmentSequenceWrapper) LCD() int64 {526 return essw.lcd527}528// ScaleInt64 scales the provided value for the given segment.529func (essw *ExecutionSegmentSequenceWrapper) ScaleInt64(segmentIndex int, value int64) int64 {530 start := essw.offsets[segmentIndex][0]531 offsets := essw.offsets[segmentIndex][1:]532 result := (value / essw.lcd) * int64(len(offsets))533 for gi, i := 0, start; i < value%essw.lcd; gi, i = gi+1, i+offsets[gi] {534 result++535 }536 return result537}538// GetStripedOffsets returns the stripped offsets for the given segment539// the returned values are as follows in order:540// - start: the first value that is for the segment541// - offsets: a list of offsets from the previous value for the segment. This are only the offsets542// to from the start to the next start if we chunk the elements we are going to strip543// into lcd sized chunks544// - lcd: the LCD of the lengths of all segments in the sequence. This is also the number of545// elements after which the algorithm starts to loop and give the same values546func (essw *ExecutionSegmentSequenceWrapper) GetStripedOffsets(segmentIndex int) (int64, []int64, int64) {547 offsets := essw.offsets[segmentIndex]548 return offsets[0], offsets[1:], essw.lcd549}550// GetTuple returns an ExecutionTuple for the specified segment index.551func (essw *ExecutionSegmentSequenceWrapper) GetTuple(segmentIndex int) *ExecutionTuple {552 return &ExecutionTuple{553 Sequence: essw,554 Segment: essw.ExecutionSegmentSequence[segmentIndex],555 SegmentIndex: segmentIndex,556 }557}558// GetNewExecutionSegmentSequenceFromValue uses the value provided, splits it559// between all the segments, using the striping offsets in the sequence,560// generating a new segment sequence. It then returns a new561// ExecutionSegmentSequenceWrapper, with the new sequence and segments, such562// that each new segment in the new sequence has length `Scale(value)/value`563// while keeping the order.564//565// Additionally, the position of a given segment index can be tracked (since566// empty segments are removed), so that you can reconstruct an ExecutionTuple,567// if required. If the segment with the trackedIndex is not part of the new568// sequence, or if a new sequence cannot be generated (for example, for 0569// values), an error will be returned.570func (essw *ExecutionSegmentSequenceWrapper) GetNewExecutionSegmentSequenceFromValue(value int64, trackedIndex int) (571 newSequence *ExecutionSegmentSequenceWrapper, newIndex int, err error,572) {573 if value < 1 {574 return nil, -1, fmt.Errorf("cannot generate new sequence for value %d", value)575 }576 if value%essw.lcd == 0 { // the value is perfectly divisible so we will get the same tuple577 return essw, trackedIndex, nil578 }579 newIndex = -1580 newESS := make(ExecutionSegmentSequence, 0, len(essw.ExecutionSegmentSequence)) // this can be smaller581 prev := int64(0)582 for i := range essw.ExecutionSegmentSequence {583 newValue := essw.ScaleInt64(i, value)584 if newValue == 0 {585 continue586 }587 currentES := newExecutionSegment(big.NewRat(prev, value), big.NewRat(prev+newValue, value))588 prev += newValue589 if i == trackedIndex {590 newIndex = len(newESS)591 }592 newESS = append(newESS, currentES)593 }594 if newIndex == -1 {595 return nil, -1, fmt.Errorf(596 "segment %d (%s) isn't present in the new sequence",597 trackedIndex, essw.ExecutionSegmentSequence[trackedIndex],598 )599 }600 return NewExecutionSegmentSequenceWrapper(newESS), newIndex, nil601}...

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newExecutionSegment

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1import "C"2func main() {3 C.someFunction()4}5cannot use C.someFunction() (type C.int) as type C.double in argument to fmt.Println6import "C"7func main() {8 C.someFunction()9}10cannot use C.someFunction() (type C.int) as type C.double in argument to fmt.Println11import "C"12func main() {13 C.someFunction()14}15cannot use C.someFunction() (type C.int) as type C.double in argument to fmt.Println

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newExecutionSegment

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1import (2func main() {3 fmt.Println("Hello")4 lib.NewExecutionSegment()5}6import (7func NewExecutionSegment() {8 fmt.Println("NewExecutionSegment")9}10import (11func TestNewExecutionSegment(t *testing.T) {12 NewExecutionSegment()13}

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newExecutionSegment

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1import (2func main() {3 segment := lib.NewExecutionSegment("segment1")4 segment2 := lib.NewExecutionSegment("segment2")5 segment3 := lib.NewExecutionSegment("segment3")6 segment4 := lib.NewExecutionSegment("segment4")7 segment5 := lib.NewExecutionSegment("segment5")8 segment6 := lib.NewExecutionSegment("segment6")9 segment7 := lib.NewExecutionSegment("segment7")10 segment8 := lib.NewExecutionSegment("segment8")11 segment9 := lib.NewExecutionSegment("segment9")12 segment10 := lib.NewExecutionSegment("segment10")13 segment11 := lib.NewExecutionSegment("segment11")14 segment12 := lib.NewExecutionSegment("segment12")15 segment13 := lib.NewExecutionSegment("segment13")16 segment14 := lib.NewExecutionSegment("segment14")17 segment15 := lib.NewExecutionSegment("segment15")18 segment16 := lib.NewExecutionSegment("segment16")19 segment17 := lib.NewExecutionSegment("segment17")20 segment18 := lib.NewExecutionSegment("segment18")21 segment19 := lib.NewExecutionSegment("segment19")

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newExecutionSegment

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1import (2func main() {3 seg := executionsegment.NewExecutionSegment("main")4 fmt.Println(seg)5}6import (7func main() {8 seg := executionsegment.NewExecutionSegmentFromParent("main", nil)9 fmt.Println(seg)10}11import (12func main() {13 seg := executionsegment.NewExecutionSegmentFromParent("main", nil)14 fmt.Println(seg)15}16import (17func main() {18 seg := executionsegment.NewExecutionSegmentFromParent("main", nil)19 fmt.Println(seg)20}21import (22func main() {23 seg := executionsegment.NewExecutionSegmentFromParent("main", nil)24 fmt.Println(seg)25}26import (27func main() {

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newExecutionSegment

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1import (2func main() {3 executionSegment := lib.NewExecutionSegment(1, 2)4 fmt.Println(executionSegment)5}6import (7func main() {8 executionSegment := lib.NewExecutionSegment(1, 2)9 fmt.Println(executionSegment)10}11type ExecutionSegment struct {12}13func NewExecutionSegment(from, to int) *ExecutionSegment {14 return &ExecutionSegment{from: from, to: to}15}16&{1 2}17&{1 2}18./1.go:5:2: imported and not used: "fmt"19./1.go:6:2: imported and not used: "github.com/ankitjena/go-training/executionsegment/lib"20./2.go:5:2: imported and not used: "fmt"21./2.go:6:2: imported and not used: "github.com/ankitjena/go-training/executionsegment/lib"

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newExecutionSegment

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1import (2func main() {3 segment := lib.NewExecutionSegment("1-2,4,6-9")4 fmt.Println(segment)5}6import (7type ExecutionSegment struct {8}9func NewExecutionSegment(s string) *ExecutionSegment {10 segment := &ExecutionSegment{}11 segment.parse(s)12}13func (segment *ExecutionSegment) parse(s string) {14 if !segment.validate(s) {15 panic("Invalid string")16 }17 segments := strings.Split(s, ",")18 for _, seg := range segments {19 if strings.Contains(seg, "-") {20 ranges := strings.Split(seg, "-")21 start, _ := strconv.Atoi(ranges[0])22 end, _ := strconv.Atoi(ranges[1])23 } else {24 start, _ := strconv.Atoi(seg)25 end, _ := strconv.Atoi(seg)26 }27 }28}29func (segment *ExecutionSegment) validate(s string) bool {30 re := regexp.MustCompile(`^(([0-9]+-[0-9]+)|([0-9]+))(,(([0-9]+-[0-

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