lang: Remove SetValue from the engine
This removes the calling of SetValue from the engine, and instead replaces it with the Table() API. The downside is that this is likely slower, and the current API with locking being exposed publicly is kind of ugly. The upside is that this might make building the new engine easier. Future versions might remove locking from the API if we can avoid making any accesses to expressions. Currently this happens within Logf/SafeLogf which is our main (only?) usage at the moment. Logging could become smarter perhaps. Alternatively, we might pass in a "setter" function that gets called safely from within the engine. This could wrap SetValue and the locking functions wouldn't be part of the public API.
This commit is contained in:
James Shubin
@@ -1497,6 +1497,40 @@ func TestAstFunc2(t *testing.T) {
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}
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}
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// XXX: temporary compatibility mapping for now...
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// XXX: this could be a helper function eventually...
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//// map the graph from interfaces.Expr to interfaces.Func
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//mapExprFunc := make(map[interfaces.Expr]interfaces.Func)
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//for v1, x := range graph.Adjacency() {
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// v1, ok := v1.(interfaces.Expr)
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// if !ok {
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// panic("programming error")
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// }
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// if _, exists := mapExprFunc[v1]; !exists {
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// var err error
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// mapExprFunc[v1], err = v1.Func()
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// if err != nil {
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// panic("programming error")
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// }
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// }
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// //funcs.AddVertex(v1)
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// for v2 := range x {
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// v2, ok := v2.(interfaces.Expr)
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// if !ok {
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// panic("programming error")
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// }
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// if _, exists := mapExprFunc[v2]; !exists {
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// var err error
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// mapExprFunc[v2], err = v2.Func()
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// if err != nil {
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// panic("programming error")
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// }
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//
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// }
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// //funcs.AddEdge(v1, v2, edge)
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// }
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//}
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// run the function engine once to get some real output
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funcs := &funcs.Engine{
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Graph: graph, // not the same as the output graph!
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@@ -1538,30 +1572,86 @@ func TestAstFunc2(t *testing.T) {
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// wait for some activity
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logf("stream...")
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stream := funcs.Stream()
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select {
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case err, ok := <-stream:
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if !ok {
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: stream closed", index)
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return
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}
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if err != nil {
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: stream errored: %+v", index, err)
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return
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}
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case <-time.After(60 * time.Second): // blocked functions
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: stream timeout", index)
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return
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// sometimes the <-stream seems to constantly (or for a
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// long time?) win the races against the <-time.After(),
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// so add some limit to how many times we need to stream
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max := 1
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Loop:
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for {
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select {
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case err, ok := <-stream:
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if !ok {
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: stream closed", index)
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return
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}
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if err != nil {
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: stream errored: %+v", index, err)
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return
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}
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t.Logf("test #%d: stream...", index)
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max--
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if max == 0 {
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break Loop
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}
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case <-time.After(3 * time.Second): // blocked functions
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break Loop
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case <-time.After(60 * time.Second): // blocked functions
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: stream timeout", index)
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return
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}
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}
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// run interpret!
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funcs.RLock() // in case something is actually changing
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ograph, err := interpret.Interpret(iast)
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funcs.RUnlock()
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table := funcs.Table() // map[pgraph.Vertex]types.Value
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fn := func(n interfaces.Node) error {
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expr, ok := n.(interfaces.Expr)
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if !ok {
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return nil
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}
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//f, exists := mapExprFunc[expr]
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//if !exists {
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// panic("programming error in mapExprFunc lookup")
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//}
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//val, exists := table[f]
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//if !exists {
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// fmt.Printf("XXX missing value in table is pointer: %p\n", f)
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// return fmt.Errorf("missing value in table for: %s", f)
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//}
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v, ok := expr.(pgraph.Vertex)
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if !ok {
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panic("programming error in interfaces.Expr -> pgraph.Vertex lookup")
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}
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val, exists := table[v]
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if !exists {
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// XXX: we have values in the AST which aren't need...
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// XXX: confirmed with: time go test -race github.com/purpleidea/mgmt/lang/ -v -run TestAstFunc2/test_#42 (func-math1) for example.
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fmt.Printf("XXX: missing value in table is pointer: %p\n", v)
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return nil // XXX: workaround for now...
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//return fmt.Errorf("missing value in table for: %s", v)
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}
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return expr.SetValue(val) // set the value
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}
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funcs.Lock() // XXX: apparently there are races between SetValue and reading obj.V values...
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if err := iast.Apply(fn); err != nil {
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: apply failed with: %+v", index, err)
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t.Errorf("test #%d: table:", index)
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for k, v := range table {
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t.Errorf("test #%d: table: key: %+v ; value: %+v", index, k, v)
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}
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funcs.Unlock()
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return
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}
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funcs.Unlock()
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ograph, err := interpret.Interpret(iast)
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if (!fail || !failInterpret) && err != nil {
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t.Errorf("test #%d: FAIL", index)
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t.Errorf("test #%d: interpret failed with: %+v", index, err)
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