97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
package terraform
|
|
|
|
import (
|
|
"log"
|
|
"strings"
|
|
|
|
"github.com/hashicorp/terraform/tfdiags"
|
|
|
|
"github.com/hashicorp/terraform/addrs"
|
|
|
|
"github.com/hashicorp/terraform/dag"
|
|
)
|
|
|
|
// Graph represents the graph that Terraform uses to represent resources
|
|
// and their dependencies.
|
|
type Graph struct {
|
|
// Graph is the actual DAG. This is embedded so you can call the DAG
|
|
// methods directly.
|
|
dag.AcyclicGraph
|
|
|
|
// Path is the path in the module tree that this Graph represents.
|
|
Path addrs.ModuleInstance
|
|
}
|
|
|
|
func (g *Graph) DirectedGraph() dag.Grapher {
|
|
return &g.AcyclicGraph
|
|
}
|
|
|
|
// Walk walks the graph with the given walker for callbacks. The graph
|
|
// will be walked with full parallelism, so the walker should expect
|
|
// to be called in concurrently.
|
|
func (g *Graph) Walk(walker GraphWalker) tfdiags.Diagnostics {
|
|
return g.walk(walker)
|
|
}
|
|
|
|
func (g *Graph) walk(walker GraphWalker) tfdiags.Diagnostics {
|
|
// The callbacks for enter/exiting a graph
|
|
ctx := walker.EvalContext()
|
|
|
|
// Walk the graph.
|
|
walkFn := func(v dag.Vertex) (diags tfdiags.Diagnostics) {
|
|
log.Printf("[TRACE] vertex %q: starting visit (%T)", dag.VertexName(v), v)
|
|
|
|
defer func() {
|
|
log.Printf("[TRACE] vertex %q: visit complete", dag.VertexName(v))
|
|
}()
|
|
|
|
// vertexCtx is the context that we use when evaluating. This
|
|
// is normally the context of our graph but can be overridden
|
|
// with a GraphNodeModuleInstance impl.
|
|
vertexCtx := ctx
|
|
if pn, ok := v.(GraphNodeModuleInstance); ok {
|
|
vertexCtx = walker.EnterPath(pn.Path())
|
|
defer walker.ExitPath(pn.Path())
|
|
}
|
|
|
|
// If the node is exec-able, then execute it.
|
|
if ev, ok := v.(GraphNodeExecutable); ok {
|
|
diags = diags.Append(walker.Execute(vertexCtx, ev))
|
|
if diags.HasErrors() {
|
|
return
|
|
}
|
|
}
|
|
|
|
// If the node is dynamically expanded, then expand it
|
|
if ev, ok := v.(GraphNodeDynamicExpandable); ok {
|
|
log.Printf("[TRACE] vertex %q: expanding dynamic subgraph", dag.VertexName(v))
|
|
|
|
g, err := ev.DynamicExpand(vertexCtx)
|
|
if err != nil {
|
|
diags = diags.Append(err)
|
|
return
|
|
}
|
|
if g != nil {
|
|
// Walk the subgraph
|
|
log.Printf("[TRACE] vertex %q: entering dynamic subgraph", dag.VertexName(v))
|
|
subDiags := g.walk(walker)
|
|
diags = diags.Append(subDiags)
|
|
if subDiags.HasErrors() {
|
|
var errs []string
|
|
for _, d := range subDiags {
|
|
errs = append(errs, d.Description().Summary)
|
|
}
|
|
log.Printf("[TRACE] vertex %q: dynamic subgraph encountered errors: %s", dag.VertexName(v), strings.Join(errs, ","))
|
|
return
|
|
}
|
|
log.Printf("[TRACE] vertex %q: dynamic subgraph completed successfully", dag.VertexName(v))
|
|
} else {
|
|
log.Printf("[TRACE] vertex %q: produced no dynamic subgraph", dag.VertexName(v))
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
return g.AcyclicGraph.Walk(walkFn)
|
|
}
|