v0.29.0 the configuration engine, and lw --schema
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@@ -0,0 +1,571 @@
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// Package compose is the configuration engine lw --tui and the website share:
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// pipelines started empty, from a preset, a configuration or a command line,
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// edited, validated, and written as a command line, environment or file. It
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// reads no file and links no network or terminal code, so it builds as WebAssembly.
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package compose
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import (
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"errors"
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"fmt"
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"reflect"
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"slices"
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"strconv"
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"strings"
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"unicode"
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"unicode/utf8"
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"github.com/lixenwraith/logwisp/internal/config"
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"github.com/lixenwraith/logwisp/internal/version"
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"github.com/lixenwraith/toml"
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)
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// Composition is the pipelines being composed. Its flow stages hold their
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// defaults and its plugin options the kinds they declare, so each form it
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// writes loads back to the same pipelines.
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type Composition struct {
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Pipelines []config.PipelineConfig
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}
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// Node is a part of a pipeline: a source or sink by its id, or a flow stage
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// by its key in the flow table: filters with an index, format, rate_limit or
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// heartbeat
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type Node struct {
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Role string
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ID string
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Index int
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}
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// FromConfig starts from a loaded configuration's pipelines, its console sinks
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// leaving the top-level color inherited
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func FromConfig(cfg *config.Config) (*Composition, error) {
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c := &Composition{}
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for _, p := range cfg.Pipelines {
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c.Pipelines = append(c.Pipelines, copyPipeline(p))
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}
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config.Uninherit(c.Pipelines, cfg.Color)
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return c, c.settle()
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}
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// FromPreset starts from a preset's pipeline; isDir answers whether its path
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// is a directory, nil off the target host (see config.IsDir)
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func FromPreset(name string, values map[string]string, isDir config.IsDir) (*Composition, error) {
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p, err := config.ExpandPreset(name, values, isDir)
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if err != nil {
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return nil, err
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}
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c := &Composition{Pipelines: []config.PipelineConfig{p}}
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return c, c.settle()
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}
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// FromCommandLine starts from a pasted lw command line, quoted as a POSIX
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// shell reads it; it takes pipeline flags only, as a composition holds no settings
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func FromCommandLine(line string, isDir config.IsDir) (*Composition, error) {
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words, err := split(strings.NewReplacer("\r\n", "\n", "\r", "\n").Replace(line)) // pasted line ends
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if err != nil {
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return nil, err
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}
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if len(words) > 0 && (words[0] == "lw" || strings.HasSuffix(words[0], "/lw")) {
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words = words[1:]
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}
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var specs []config.Spec
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for i := 0; i < len(words); i++ {
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name, value, inline := strings.Cut(words[i], "=")
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if name == "-p" {
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name = "--preset"
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}
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flag, long := strings.CutPrefix(name, "--")
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if !long || !slices.ContainsFunc(config.SpecFlags(), func(f config.SpecFlag) bool { return f.Flag == flag }) {
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return nil, fmt.Errorf("%s: not a pipeline flag", words[i])
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}
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if !inline {
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if i++; i == len(words) || strings.HasPrefix(words[i], "-") {
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return nil, fmt.Errorf("%s requires a value; one that starts with '-' follows '='", name)
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}
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value = words[i]
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}
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specs = append(specs, config.Spec{Flag: flag, Value: value})
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}
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pipelines, err := config.SpecPipelines(specs, isDir)
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if err != nil {
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return nil, err
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}
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c := &Composition{Pipelines: pipelines}
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return c, c.settle()
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}
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// settle gives every flow stage its defaults and every plugin's options their
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// kinds; the rules are Validate's
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func (c *Composition) settle() error {
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for i := range c.Pipelines {
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p := &c.Pipelines[i]
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if p.Flow == nil {
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p.Flow = &config.FlowConfig{}
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}
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for _, stage := range stages(p.Flow) {
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if !stage.IsNil() {
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config.Fill(stage.Interface())
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}
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}
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for j := range p.Flow.Filters {
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config.Fill(&p.Flow.Filters[j])
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}
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for j, s := range p.PluginSources {
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p.PluginSources[j].Config = orEmpty(s.Config)
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if err := config.Coerce("source", s.Type, p.PluginSources[j].Config); err != nil {
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return fmt.Errorf("source %s: %w", s.ID, err)
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}
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}
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for j, s := range p.PluginSinks {
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p.PluginSinks[j].Config = orEmpty(s.Config)
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if err := config.Coerce("sink", s.Type, p.PluginSinks[j].Config); err != nil {
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return fmt.Errorf("sink %s: %w", s.ID, err)
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}
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}
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}
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return nil
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}
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// stages are the flow table's fields that hold one stage each, by key: a
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// pointer, nil while the stage is off. The filters are a list.
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func stages(f *config.FlowConfig) map[string]reflect.Value {
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v, out := reflect.ValueOf(f).Elem(), map[string]reflect.Value{}
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for i := range v.NumField() {
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if v.Field(i).Kind() == reflect.Pointer {
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key, _, _ := strings.Cut(v.Type().Field(i).Tag.Get("toml"), ",")
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out[key] = v.Field(i)
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}
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}
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return out
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}
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func orEmpty(m map[string]any) map[string]any {
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if m == nil {
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return map[string]any{}
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}
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return m
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}
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func (c *Composition) pipeline(i int) (*config.PipelineConfig, error) {
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if i < 0 || i >= len(c.Pipelines) {
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return nil, fmt.Errorf("no pipeline %d", i)
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}
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return &c.Pipelines[i], nil
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}
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// AddPipeline appends an empty pipeline under a name no other has
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func (c *Composition) AddPipeline(name string) error {
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if name == "" || slices.ContainsFunc(c.Pipelines, func(p config.PipelineConfig) bool { return p.Name == name }) {
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return fmt.Errorf("pipeline %q: a name no other pipeline has", name)
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}
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c.Pipelines = append(c.Pipelines, config.PipelineConfig{Name: name, Flow: &config.FlowConfig{}})
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return nil
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}
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func (c *Composition) RemovePipeline(i int) error {
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if _, err := c.pipeline(i); err != nil {
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return err
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}
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c.Pipelines = slices.Delete(c.Pipelines, i, i+1)
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return nil
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}
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// Add appends a source or sink of a catalogue type under config.FreeID, or a
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// filter of type include or exclude, and returns its node
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func (c *Composition) Add(pi int, role, typ string) (Node, error) {
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p, err := c.pipeline(pi)
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if err != nil {
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return Node{}, err
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}
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var ids []string
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switch role {
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case "source":
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for _, s := range p.PluginSources {
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ids = append(ids, s.ID)
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}
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case "sink":
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for _, s := range p.PluginSinks {
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ids = append(ids, s.ID)
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}
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case "filters":
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f := config.FilterConfig{Type: config.FilterType(typ)}
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config.Fill(&f)
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p.Flow.Filters = append(p.Flow.Filters, f)
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return Node{Role: role, Index: len(p.Flow.Filters) - 1}, nil
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default:
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return Node{}, fmt.Errorf("cannot add to %s", role)
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}
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if _, ok := config.LookupPlugin(role, typ); !ok {
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return Node{}, fmt.Errorf("unknown %s type %q", role, typ)
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}
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n := Node{Role: role, ID: config.FreeID(typ, ids)}
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if role == "source" {
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p.PluginSources = append(p.PluginSources, config.PluginSourceConfig{ID: n.ID, Type: typ, Config: map[string]any{}})
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} else {
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p.PluginSinks = append(p.PluginSinks, config.PluginSinkConfig{ID: n.ID, Type: typ, Config: map[string]any{}})
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}
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return n, nil
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}
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// Remove deletes a source, sink or filter, or turns a flow stage off
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func (c *Composition) Remove(pi int, n Node) error {
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p, err := c.pipeline(pi)
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if err != nil {
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return err
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}
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switch i := index(p, n); {
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case i < 0:
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case n.Role == "source":
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p.PluginSources = slices.Delete(p.PluginSources, i, i+1)
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return nil
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case n.Role == "sink":
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p.PluginSinks = slices.Delete(p.PluginSinks, i, i+1)
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return nil
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case n.Role == "filters":
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p.Flow.Filters = slices.Delete(p.Flow.Filters, i, i+1)
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return nil
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}
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if stage, ok := stages(p.Flow)[n.Role]; ok {
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stage.SetZero()
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return nil
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}
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return n.missing()
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}
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// index finds a node in its list, -1 when it is in none
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func index(p *config.PipelineConfig, n Node) int {
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switch n.Role {
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case "source":
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return slices.IndexFunc(p.PluginSources, func(s config.PluginSourceConfig) bool { return s.ID == n.ID })
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case "sink":
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return slices.IndexFunc(p.PluginSinks, func(s config.PluginSinkConfig) bool { return s.ID == n.ID })
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case "filters":
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if n.Index >= 0 && n.Index < len(p.Flow.Filters) {
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return n.Index
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}
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}
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return -1
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}
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func (n Node) missing() error {
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if n.Role == "filters" {
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return fmt.Errorf("no filter %d", n.Index)
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}
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return fmt.Errorf("no %s %q", n.Role, n.ID)
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}
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// MoveFilter moves a filter to index to; entries pass filters in order
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func (c *Composition) MoveFilter(pi, from, to int) error {
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p, err := c.pipeline(pi)
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if err != nil {
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return err
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}
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if n := len(p.Flow.Filters); from < 0 || from >= n || to < 0 || to >= n {
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return fmt.Errorf("no filter %d or %d", from, to)
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}
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f := p.Flow.Filters[from]
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p.Flow.Filters = slices.Insert(slices.Delete(p.Flow.Filters, from, from+1), to, f)
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return nil
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}
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// Set gives a key at a dotted path its values: one, or several for a list. A
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// flow stage that is off turns on. A value of the wrong kind leaves the key as
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// it was; any other rule is Validate's.
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func (c *Composition) Set(pi int, n Node, key string, values ...string) error {
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return c.edit(pi, n, func(m map[string]any) error {
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unset(m, strings.Split(key, "."))
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for _, v := range values {
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if err := config.SetOption(m, key, v); err != nil {
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return err
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}
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}
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return nil
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})
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}
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// Unset returns a key to its default
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func (c *Composition) Unset(pi int, n Node, key string) error {
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return c.edit(pi, n, func(m map[string]any) error {
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unset(m, strings.Split(key, "."))
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return nil
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})
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}
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// unset deletes a dotted key, and the tables it leaves empty
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func unset(m map[string]any, path []string) {
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if sub, ok := m[path[0]].(map[string]any); ok && len(path) > 1 {
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if unset(sub, path[1:]); len(sub) > 0 {
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return
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}
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}
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delete(m, path[0])
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}
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// edit changes a copy of a node's options, which replaces them when they
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// decode to the kinds they declare
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func (c *Composition) edit(pi int, n Node, change func(map[string]any) error) error {
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p, err := c.pipeline(pi)
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if err != nil {
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return err
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}
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plugin := func(typ string, m *map[string]any) error {
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next := config.Clone(*m)
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if err := change(next); err != nil {
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return err
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}
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if err := config.Coerce(n.Role, typ, next); err != nil {
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return err
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}
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*m = next
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return nil
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}
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switch i := index(p, n); {
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case i < 0:
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case n.Role == "source":
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return plugin(p.PluginSources[i].Type, &p.PluginSources[i].Config)
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case n.Role == "sink":
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return plugin(p.PluginSinks[i].Type, &p.PluginSinks[i].Config)
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case n.Role == "filters":
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filter := &p.Flow.Filters[i]
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if err := editStage(reflect.ValueOf(&filter).Elem(), change); err != nil {
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return err
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}
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p.Flow.Filters[i] = *filter
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return nil
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}
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if stage, ok := stages(p.Flow)[n.Role]; ok {
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return editStage(stage, change)
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}
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return n.missing()
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}
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// editStage edits a stage's keys as a spec sets them; the table they scan into
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// replaces the stage, which turns on
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func editStage(stage reflect.Value, change func(map[string]any) error) error {
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m := map[string]any{}
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if !stage.IsNil() {
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m = config.Values(stage.Interface())
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}
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if err := change(m); err != nil {
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return err
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}
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next := reflect.New(stage.Type().Elem())
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if err := config.Scan(m, next.Interface()); err != nil {
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return err
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}
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config.Fill(next.Interface())
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stage.Set(next)
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return nil
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}
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// Validate applies every rule lw applies at load, naming the refused key's path
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func (c *Composition) Validate() error { return config.ValidatePipelines(c.Pipelines) }
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// CommandLine writes the composition as an lw command line, a flag a line,
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// quoted for a POSIX shell
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func (c *Composition) CommandLine() (string, error) {
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specs, err := c.shellSpecs()
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if err != nil {
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return "", err
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}
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lines := []string{"lw"}
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for _, s := range specs {
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if strings.HasPrefix(s.Value, "-") {
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lines = append(lines, quote("--"+s.Flag+"="+s.Value))
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} else {
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lines = append(lines, "--"+s.Flag+" "+quote(s.Value))
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}
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}
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return strings.Join(lines, " \\\n ") + "\n", nil
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}
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// Environment writes the composition as LOGWISP_ variables, KEY='value' a
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// line as an environment file holds them; the environment holds one pipeline
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func (c *Composition) Environment() (string, error) {
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if len(c.Pipelines) != 1 {
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return "", fmt.Errorf("the environment holds one pipeline, not %d", len(c.Pipelines))
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}
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specs, err := c.shellSpecs()
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if err != nil {
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return "", err
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}
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flags, count := config.SpecFlags(), map[string]int{}
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var b strings.Builder
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for _, s := range specs {
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f := flags[slices.IndexFunc(flags, func(f config.SpecFlag) bool { return f.Flag == s.Flag })]
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name := f.Variable
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if f.Many {
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count[f.Flag]++
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name += "_" + strconv.Itoa(count[f.Flag])
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}
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fmt.Fprintf(&b, "%s='%s'\n", name, strings.ReplaceAll(s.Value, "'", `'\''`))
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}
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return b.String(), nil
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}
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// shellSpecs are the specs of a valid composition, for a form pasted into a
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// shell, which carries no control character: a terminal acts on ^U or ESC
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// before the shell reads the line
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func (c *Composition) shellSpecs() ([]config.Spec, error) {
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if err := c.Validate(); err != nil {
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return nil, err
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}
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specs, pipeline := config.PipelineSpecs(c.Pipelines), ""
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for _, s := range specs {
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if s.Flag == "pipeline" {
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pipeline = s.Value
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}
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if strings.ContainsFunc(s.Value, func(r rune) bool { return unicode.IsControl(r) || r == utf8.RuneError }) {
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return nil, fmt.Errorf("pipeline %q: a --%s value holds a control character, which only the file form carries", pipeline, s.Flag)
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}
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}
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return specs, nil
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}
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// File writes the composition as a configuration file's pipelines, as lw
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// --dump prints them
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func (c *Composition) File() ([]byte, error) {
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if err := c.Validate(); err != nil {
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return nil, err
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}
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return toml.Marshal(map[string]any{"pipelines": c.Pipelines})
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}
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// quote leaves a word of these characters bare, and single-quotes any other,
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// or one starting with '=', which zsh expands
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func quote(word string) string {
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const bare = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_@%+=:,./-"
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if word != "" && word[0] != '=' && strings.Trim(word, bare) == "" {
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return word
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}
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return "'" + strings.ReplaceAll(word, "'", `'\''`) + "'"
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}
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|
||||
// split reads words as a POSIX shell does, without expansions: quotes, '\'
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// escapes, and '\' before a newline continuing the line
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func split(line string) ([]string, error) {
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var words []string
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var word strings.Builder
|
||||
in := false
|
||||
for i := 0; i < len(line); i++ {
|
||||
switch c := line[i]; {
|
||||
case c == '\\' && i+1 < len(line):
|
||||
if i++; line[i] != '\n' {
|
||||
word.WriteByte(line[i])
|
||||
in = true
|
||||
}
|
||||
case c == '\'':
|
||||
end := strings.IndexByte(line[i+1:], '\'')
|
||||
if end < 0 {
|
||||
return nil, errors.New("unterminated '")
|
||||
}
|
||||
word.WriteString(line[i+1 : i+1+end])
|
||||
i, in = i+1+end, true
|
||||
case c == '"':
|
||||
for i, in = i+1, true; ; i++ {
|
||||
if i == len(line) {
|
||||
return nil, errors.New(`unterminated "`)
|
||||
}
|
||||
if line[i] == '"' {
|
||||
break
|
||||
}
|
||||
if line[i] == '\\' && i+1 < len(line) && strings.IndexByte("$`\"\\\n", line[i+1]) >= 0 {
|
||||
if i++; line[i] == '\n' {
|
||||
continue
|
||||
}
|
||||
}
|
||||
word.WriteByte(line[i])
|
||||
}
|
||||
case c == ' ' || c == '\t' || c == '\n':
|
||||
if in {
|
||||
words, in = append(words, word.String()), false
|
||||
word.Reset()
|
||||
}
|
||||
default:
|
||||
word.WriteByte(c)
|
||||
in = true
|
||||
}
|
||||
}
|
||||
if in {
|
||||
words = append(words, word.String())
|
||||
}
|
||||
return words, nil
|
||||
}
|
||||
|
||||
func copyPipeline(p config.PipelineConfig) config.PipelineConfig {
|
||||
f := config.FlowConfig{}
|
||||
if p.Flow != nil {
|
||||
f = *p.Flow
|
||||
}
|
||||
for _, stage := range stages(&f) {
|
||||
if !stage.IsNil() {
|
||||
next := reflect.New(stage.Type().Elem())
|
||||
next.Elem().Set(stage.Elem())
|
||||
stage.Set(next)
|
||||
}
|
||||
}
|
||||
f.Filters = slices.Clone(f.Filters)
|
||||
for i := range f.Filters {
|
||||
f.Filters[i].Patterns = slices.Clone(f.Filters[i].Patterns)
|
||||
}
|
||||
p.Flow = &f
|
||||
p.PluginSources = slices.Clone(p.PluginSources)
|
||||
for i, s := range p.PluginSources {
|
||||
p.PluginSources[i].Config = config.Clone(orEmpty(s.Config))
|
||||
}
|
||||
p.PluginSinks = slices.Clone(p.PluginSinks)
|
||||
for i, s := range p.PluginSinks {
|
||||
p.PluginSinks[i].Config = config.Clone(orEmpty(s.Config))
|
||||
}
|
||||
return p
|
||||
}
|
||||
|
||||
// Schema is what lw --schema prints, and the website builds its catalogue
|
||||
// from. A setting's flag is --KEY, a pipeline flag's --FLAG.
|
||||
type Schema struct {
|
||||
Version string `json:"version"`
|
||||
Settings []Setting `json:"settings"`
|
||||
Flags []config.SpecFlag `json:"pipeline_flags"`
|
||||
Flow []config.Stage `json:"flow"`
|
||||
Tables map[string][]config.Key `json:"tables"`
|
||||
Sources []Plugin `json:"sources"`
|
||||
Sinks []Plugin `json:"sinks"`
|
||||
Presets []config.Preset `json:"presets"`
|
||||
}
|
||||
|
||||
// Setting is a settings key with its environment variable
|
||||
type Setting struct {
|
||||
config.Key
|
||||
Variable string `json:"variable"`
|
||||
}
|
||||
|
||||
// Plugin is a catalogue row with its options
|
||||
type Plugin struct {
|
||||
config.Plugin
|
||||
Keys []config.Key `json:"keys"`
|
||||
}
|
||||
|
||||
func NewSchema() Schema {
|
||||
s := Schema{
|
||||
Version: version.Short(),
|
||||
Flags: config.SpecFlags(),
|
||||
Flow: config.FlowStages(),
|
||||
Tables: map[string][]config.Key{
|
||||
"tls": config.KeysOf[config.TLSOptions](),
|
||||
"auth": config.KeysOf[config.AuthOptions](),
|
||||
"acl": config.KeysOf[config.ACLOptions](),
|
||||
},
|
||||
Presets: config.Presets(),
|
||||
}
|
||||
for _, k := range config.SettingKeys() {
|
||||
s.Settings = append(s.Settings, Setting{k, "LOGWISP_" + strings.ToUpper(strings.ReplaceAll(k.Name, ".", "_"))})
|
||||
}
|
||||
for _, p := range config.Plugins() {
|
||||
if p.Role == "source" {
|
||||
s.Sources = append(s.Sources, Plugin{p, p.Keys()})
|
||||
} else {
|
||||
s.Sinks = append(s.Sinks, Plugin{p, p.Keys()})
|
||||
}
|
||||
}
|
||||
return s
|
||||
}
|
||||
Reference in new issue
Block a user