90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
package dagger
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import (
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"context"
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"os"
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"github.com/pkg/errors"
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)
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type Component struct {
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// Source value for the component, without spec merged
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// eg. `{ string, #dagger: compute: [{do:"fetch-container", ...}]}`
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v *Value
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}
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func NewComponent(v *Value) (*Component, error) {
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if !v.Exists() {
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// Component value does not exist
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return nil, ErrNotExist
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}
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if !v.Get("#dagger").Exists() {
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// Component value exists but has no `#dagger` definition
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return nil, ErrNotExist
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}
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// Validate & merge with spec
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final, err := v.Finalize(v.cc.Spec().Get("#Component"))
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if err != nil {
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return nil, errors.Wrap(err, "invalid component")
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}
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return &Component{
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v: final,
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}, nil
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}
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func (c *Component) Value() *Value {
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return c.v
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}
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// Return the contents of the "#dagger" annotation.
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func (c *Component) Config() *Value {
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return c.Value().Get("#dagger")
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}
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// Return this component's compute script.
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func (c *Component) ComputeScript() (*Script, error) {
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return newScript(c.Config().Get("compute"))
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}
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// Compute the configuration for this component.
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//
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// Difference with Execute:
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//
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// 1. Always start with an empty fs state (Execute may receive any state as input)
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// 2. Always solve at the end (Execute is lazy)
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//
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func (c *Component) Compute(ctx context.Context, s Solver, out *Fillable) (FS, error) {
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fs, err := c.Execute(ctx, s.Scratch(), out)
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if err != nil {
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return fs, err
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}
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// Force a `Solve()` in case it hasn't been called earlier.
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// If the FS is already solved, this is a noop.
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_, err = fs.Solve(ctx)
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return fs, err
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}
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// A component implements the Executable interface by returning its
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// compute script.
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// See Value.Executable().
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func (c *Component) Execute(ctx context.Context, fs FS, out *Fillable) (FS, error) {
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script, err := c.ComputeScript()
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if err != nil {
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// If the component has no script, then do not fail.
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if os.IsNotExist(err) {
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return fs, nil
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}
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return fs, err
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}
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return script.Execute(ctx, fs, out)
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}
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func (c *Component) Walk(ctx context.Context, fn func(*Op) error) error {
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script, err := c.ComputeScript()
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if err != nil {
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return err
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}
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return script.Walk(ctx, fn)
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}
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