woodpecker/pipeline/frontend/yaml/matrix/matrix.go

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// Copyright 2022 Woodpecker Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package matrix
import (
"strings"
pipeline "github.com/woodpecker-ci/woodpecker/pipeline/frontend/yaml"
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"gopkg.in/yaml.v3"
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)
const (
limitTags = 10
limitAxis = 25
)
// Matrix represents the pipeline matrix.
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type Matrix map[string][]string
// Axis represents a single permutation of entries from the pipeline matrix.
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type Axis map[string]string
// String returns a string representation of an Axis as a comma-separated list
// of environment variables.
func (a Axis) String() string {
var envs []string
for k, v := range a {
envs = append(envs, k+"="+v)
}
return strings.Join(envs, " ")
}
// Parse parses the Yaml matrix definition.
func Parse(data []byte) ([]Axis, error) {
axis, err := parseList(data)
if err == nil && len(axis) != 0 {
return axis, nil
}
matrix, err := parse(data)
if err != nil {
return nil, err
}
if len(matrix) == 0 {
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return []Axis{}, nil
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}
return calc(matrix), nil
}
// ParseString parses the Yaml string matrix definition.
func ParseString(data string) ([]Axis, error) {
return Parse([]byte(data))
}
func calc(matrix Matrix) []Axis {
// calculate number of permutations and extract the list of tags
// (ie go_version, redis_version, etc)
var perm int
var tags []string
for k, v := range matrix {
perm *= len(v)
if perm == 0 {
perm = len(v)
}
tags = append(tags, k)
}
// structure to hold the transformed result set
var axisList []Axis
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// for each axis calculate the unique set of values that should be used.
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for p := 0; p < perm; p++ {
axis := map[string]string{}
decr := perm
for i, tag := range tags {
elems := matrix[tag]
decr = decr / len(elems)
elem := p / decr % len(elems)
axis[tag] = elems[elem]
// enforce a maximum number of tags in the pipeline matrix.
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if i > limitTags {
break
}
}
// append to the list of axis.
axisList = append(axisList, axis)
// enforce a maximum number of axis that should be calculated.
if p > limitAxis {
break
}
}
return axisList
}
func parse(raw []byte) (Matrix, error) {
data := struct {
Matrix map[string][]string
}{}
if err := yaml.Unmarshal(raw, &data); err != nil {
return nil, &pipeline.PipelineParseError{Err: err}
}
return data.Matrix, nil
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}
func parseList(raw []byte) ([]Axis, error) {
data := struct {
Matrix struct {
Include []Axis
}
}{}
if err := yaml.Unmarshal(raw, &data); err != nil {
return nil, &pipeline.PipelineParseError{Err: err}
}
return data.Matrix.Include, nil
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}