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bind_test.go
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bind_test.go
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package incr
import (
"context"
"fmt"
"sync"
"testing"
"github.com/wcharczuk/go-incr/testutil"
)
func Test_Bind_basic(t *testing.T) {
ctx := testContext()
g := New()
bindVar := Var(g, "a")
bindVar.Node().SetLabel("bindVar")
av := Var(g, "a-value")
av.Node().SetLabel("av")
a0 := Map(g, av, ident)
a0.Node().SetLabel("a0")
a1 := Map(g, a0, ident)
a1.Node().SetLabel("a1")
bv := Var(g, "b-value")
bv.Node().SetLabel("bv")
b0 := Map(g, bv, ident)
b0.Node().SetLabel("b0")
b1 := Map(g, b0, ident)
b1.Node().SetLabel("b1")
b2 := Map(g, b1, ident)
b2.Node().SetLabel("b2")
bind := Bind(g, bindVar, func(_ Scope, which string) Incr[string] {
if which == "a" {
return a1
}
if which == "b" {
return b2
}
return nil
})
bind.Node().SetLabel("bind")
testutil.Matches(t, "bind\\[(.*)\\]:bind", bind.String())
s0 := Return(g, "hello")
s0.Node().SetLabel("s0")
s1 := Map(g, s0, ident)
s1.Node().SetLabel("s1")
o := Map2(g, bind, s1, concat)
o.Node().SetLabel("o")
_ = MustObserve(g, o)
var err error
testutil.Equal(t, 0, bindVar.Node().height)
testutil.Equal(t, 0, s0.Node().height)
testutil.Equal(t, 1, s1.Node().height)
testutil.Equal(t, 2, bind.Node().height)
testutil.Equal(t, 3, o.Node().height)
testutil.Equal(t, true, g.Has(bindVar))
testutil.Equal(t, true, g.Has(s0))
testutil.Equal(t, true, g.Has(s1))
testutil.Equal(t, true, g.Has(bind))
testutil.Equal(t, true, g.Has(o))
testutil.Equal(t, false, g.Has(av))
testutil.Equal(t, false, g.Has(a0))
testutil.Equal(t, false, g.Has(a1))
testutil.Equal(t, false, g.Has(bv))
testutil.Equal(t, false, g.Has(b0))
testutil.Equal(t, false, g.Has(b1))
testutil.Equal(t, false, g.Has(b2))
err = g.Stabilize(ctx)
testutil.Nil(t, err)
_ = dumpDot(g, homedir("bind_basic_00.png"))
testutil.Equal(t, 1, bind.Node().recomputedAt)
testutil.Equal(t, 1, bind.Node().changedAt)
testutil.Equal(t, 1, a1.Node().changedAt)
testutil.Equal(t, 0, bindVar.Node().height)
testutil.Equal(t, 0, s0.Node().height)
testutil.Equal(t, 1, s1.Node().height)
testutil.Equal(t, 0, av.Node().height)
testutil.Equal(t, 1, a0.Node().height)
testutil.Equal(t, 2, a1.Node().height)
testutil.Equal(t, 3, bind.Node().height)
testutil.Equal(t, 4, o.Node().height)
testutil.Equal(t, true, g.Has(bindVar))
testutil.Equal(t, true, g.Has(s0))
testutil.Equal(t, true, g.Has(s1))
testutil.Equal(t, true, g.Has(bind))
testutil.Equal(t, true, g.Has(o))
testutil.Equal(t, true, g.Has(av))
testutil.Equal(t, true, g.Has(a0))
testutil.Equal(t, true, g.Has(a1))
testutil.Equal(t, false, g.Has(bv))
testutil.Equal(t, false, g.Has(b0))
testutil.Equal(t, false, g.Has(b1))
testutil.Equal(t, false, g.Has(b2))
testutil.Equal(t, "a-value", av.Value())
testutil.Equal(t, "a-value", bind.Value())
testutil.Equal(t, "a-valuehello", o.Value())
bindVar.Set("b")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
err = dumpDot(g, homedir("bind_basic_01.png"))
testutil.Nil(t, err)
testutil.Equal(t, 0, bindVar.Node().height)
testutil.Equal(t, 0, s0.Node().height)
testutil.Equal(t, 1, s1.Node().height)
testutil.Equal(t, HeightUnset, av.Node().height)
testutil.Equal(t, HeightUnset, a0.Node().height)
testutil.Equal(t, HeightUnset, a1.Node().height)
testutil.Equal(t, 0, bv.Node().height)
testutil.Equal(t, 1, b0.Node().height)
testutil.Equal(t, 2, b1.Node().height)
testutil.Equal(t, 3, b2.Node().height)
testutil.Equal(t, 4, bind.Node().height)
testutil.Equal(t, 5, o.Node().height)
testutil.Equal(t, true, g.Has(bindVar))
testutil.Equal(t, true, g.Has(s0))
testutil.Equal(t, true, g.Has(s1))
testutil.Equal(t, true, g.Has(bind))
testutil.Equal(t, true, g.Has(o))
testutil.Equal(t, false, g.Has(av))
testutil.Equal(t, false, g.Has(a0))
testutil.Equal(t, false, g.Has(a1))
testutil.Equal(t, true, g.Has(bv))
testutil.Equal(t, true, g.Has(b0))
testutil.Equal(t, true, g.Has(b1))
testutil.Equal(t, true, g.Has(b2))
testutil.Equal(t, "a-value", av.Value())
testutil.Equal(t, "b-value", bv.Value())
testutil.Equal(t, "b-valuehello", o.Value())
bindVar.Set("neither")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
err = dumpDot(g, homedir("bind_basic_02.png"))
testutil.Nil(t, err)
testutil.Equal(t, 0, bindVar.Node().height)
testutil.Equal(t, 0, s0.Node().height)
testutil.Equal(t, 1, s1.Node().height)
testutil.Equal(t, HeightUnset, av.Node().height)
testutil.Equal(t, HeightUnset, a0.Node().height)
testutil.Equal(t, HeightUnset, a1.Node().height)
testutil.Equal(t, HeightUnset, bv.Node().height)
testutil.Equal(t, HeightUnset, b0.Node().height)
testutil.Equal(t, HeightUnset, b1.Node().height)
testutil.Equal(t, HeightUnset, b2.Node().height)
testutil.Equal(t, 4, bind.Node().height)
testutil.Equal(t, 5, o.Node().height)
testutil.Equal(t, true, g.Has(bindVar))
testutil.Equal(t, true, g.Has(s0))
testutil.Equal(t, true, g.Has(s1))
testutil.Equal(t, true, g.Has(bind))
testutil.Equal(t, true, g.Has(o))
testutil.Equal(t, false, g.Has(av))
testutil.Equal(t, false, g.Has(a0))
testutil.Equal(t, false, g.Has(a1))
testutil.Equal(t, false, g.Has(bv))
testutil.Equal(t, false, g.Has(b0))
testutil.Equal(t, false, g.Has(b1))
testutil.Equal(t, false, g.Has(b2))
testutil.Equal(t, "a-value", av.Value())
testutil.Equal(t, "b-value", bv.Value())
testutil.Equal(t, "hello", o.Value())
}
func Test_Bind_scopes(t *testing.T) {
/*
{[
let t1 = map ... in
bind t2 ~f:(fun _ ->
let t3 = map ... in
map2 t1 t3 ~f:(...))
]}
In this example, [t1] is created outside of [bind t2], whereas [t3] is created by the
right-hand side of [bind t2]. So, [t3] depends on [t2] (and has a greater height),
whereas [t1] does not. And, in a stabilization in which [t2] changes, we are
guaranteed to not recompute the old [t3], but we have no such guarantee about [t1].
Furthermore, when [t2] changes, the old [t3] will be invalidated, whereas [t1] will
not.
*/
g := New()
ctx := testContext()
t1 := Map(g, Return(g, "t1"), mapAppend("-mapped"))
t1.Node().SetLabel("t1")
t2 := Bind(g, Return(g, "t2"), func(bs Scope, _ string) Incr[string] {
rt3 := Return(bs, "t3")
t3 := Map(bs, rt3, mapAppend("-mapped"))
t3.Node().SetLabel("t3")
r := Map2(bs, t1, t3, concat)
r.Node().SetLabel("t2-map")
return r
})
t2.Node().SetLabel("t2")
o := MustObserve(g, t2)
err := g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Equal(t, true, t1.Node().createdIn.isTopScope())
testutil.Equal(t, true, g.Has(t1))
testutil.Equal(t, "t1-mappedt3-mapped", o.Value())
testutil.NotNil(t, t1.Node().createdIn)
testutil.Equal(t, true, t1.Node().createdIn.isTopScope())
}
func Test_Bind_necessary(t *testing.T) {
/*
We need to unobserve nodes such that a node isn't fully unobserved as long as there is a valid
path from an observer to that node *somewhere*.
*/
ctx := testContext()
g := New()
root := Var(g, "hello")
root.Node().SetLabel("root")
ma00 := Map(g, root, ident)
ma00.Node().SetLabel("ma00")
mb00 := Map(g, Return(g, "not-hello"), ident)
mb00.Node().SetLabel("mb00")
b0v := Var(g, "a")
b0v.Node().SetLabel("b0v")
b0 := Bind(g, b0v, func(_ Scope, v string) Incr[string] {
if v == "a" {
return ma00
}
return mb00
})
b0.Node().SetLabel("b0")
ma01 := Map(g, root, ident)
ma01.Node().SetLabel("ma01")
mb01 := Map(g, Return(g, "not-hello"), ident)
mb01.Node().SetLabel("mb01")
b1v := Var(g, "a")
b1v.Node().SetLabel("b1v")
b1 := Bind(g, b1v, func(_ Scope, v string) Incr[string] {
if v == "a" {
return ma01
}
return mb01
})
b1.Node().SetLabel("b1")
m2 := Map2(g, b0, b1, concat)
m2.Node().SetLabel("join")
o := MustObserve(g, m2)
err := g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Equal(t, "hellohello", o.Value())
_ = dumpDot(g, homedir("bind_necessary_00.png"))
b0v.Set("b")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
_ = dumpDot(g, homedir("bind_necessary_01.png"))
testutil.Equal(t, true, g.Has(root))
}
func Test_Bind_unbindConflict(t *testing.T) {
/*
We need to unbind such that if another node is returning
a shared node we don't unbind that node's "reference" to the node.
*/
g := New()
root := Var(g, "hello")
root.Node().SetLabel("root")
ma := Map(g, root, ident)
ma.Node().SetLabel("ma")
mb := Map(g, Return(g, "not-hello"), ident)
mb.Node().SetLabel("mb")
b0v := Var(g, "a")
b0v.Node().SetLabel("b0v")
b0 := Bind(g, b0v, func(_ Scope, v string) Incr[string] {
if v == "a" {
return ma
}
return mb
})
b0.Node().SetLabel("b0")
b1v := Var(g, "a")
b1v.Node().SetLabel("b1v")
b1 := Bind(g, b1v, func(_ Scope, v string) Incr[string] {
if v == "a" {
return ma
}
return mb
})
b1.Node().SetLabel("b1")
m2 := Map2(g, b0, b1, concat)
m2.Node().SetLabel("join")
o := MustObserve(g, m2)
err := g.Stabilize(testContext())
testutil.Nil(t, err)
testutil.Equal(t, "hellohello", o.Value())
_ = dumpDot(g, homedir("bind_unbind_confict_00.png"))
b0v.Set("b")
err = g.Stabilize(testContext())
testutil.Nil(t, err)
_ = dumpDot(g, homedir("bind_unbind_conflict_01.png"))
testutil.Equal(t, true, g.Has(ma))
}
func Test_Bind_rebind(t *testing.T) {
/*
The goal here is to stress the narrow case that
if you stabilize a bind twice, but the returned rhs
is the same, nothing really should happen.
*/
ctx := testContext()
g := New()
bindVar := Var(g, "a")
bindVar.Node().SetLabel("bindVar")
av := Var(g, "a-value")
av.Node().SetLabel("av")
a0 := Map(g, av, ident)
a0.Node().SetLabel("a0")
a1 := Map(g, a0, ident)
a1.Node().SetLabel("a1")
bv := Var(g, "b-value")
bv.Node().SetLabel("bv")
b0 := Map(g, bv, ident)
b0.Node().SetLabel("b0")
b1 := Map(g, b0, ident)
b1.Node().SetLabel("b1")
b2 := Map(g, b1, ident)
b2.Node().SetLabel("b2")
bind := Bind(g, bindVar, func(_ Scope, which string) Incr[string] {
if which == "a" {
return a1
}
if which == "b" {
return b2
}
return nil
})
bind.Node().SetLabel("bind")
s0 := Return(g, "hello")
s0.Node().SetLabel("s0")
s1 := Map(g, s0, ident)
s1.Node().SetLabel("s1")
o := Map2(g, bind, s1, func(a, b string) string {
return concat(a, b)
})
o.Node().SetLabel("o")
var childRecomputes int
o.Node().OnUpdate(func(_ context.Context) {
childRecomputes++
})
_ = MustObserve(g, o)
var err error
err = g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Equal(t, 1, bind.Node().recomputedAt)
testutil.Equal(t, 1, childRecomputes)
testutil.Equal(t, "a-value", av.Value())
testutil.Equal(t, "b-value", bv.Value())
testutil.Equal(t, "a-valuehello", o.Value())
bindVar.Set("a")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Equal(t, 2, bind.Node().recomputedAt)
testutil.Equal(t, 2, childRecomputes)
testutil.Equal(t, "a-value", av.Value())
testutil.Equal(t, "b-value", bv.Value())
testutil.Equal(t, "a-valuehello", o.Value())
}
func Test_Bind_error(t *testing.T) {
ctx := testContext()
g := New()
v0 := Var(g, "a")
bind := BindContext(g, v0, func(_ context.Context, _ Scope, which string) (Incr[string], error) {
return nil, fmt.Errorf("this is just a test")
})
bind.Node().SetLabel("bind")
o := Map(g, bind, ident)
_ = MustObserve(g, o)
err := g.Stabilize(ctx)
testutil.NotNil(t, err)
testutil.Equal(t, "this is just a test", err.Error())
}
func Test_Bind_nested(t *testing.T) {
// a -> c
// a -> b -> c
// a -> c
ctx := testContext()
g := New()
a0 := createDynamicMaps(g, "a0")
a1 := createDynamicMaps(g, "a1")
bv, b := createDynamicBind(g, "b", a0, a1)
cv, c := createDynamicBind(g, "c", a0, b)
rfinal := Return(g, "final")
rfinal.Node().SetLabel("return - final")
final := Map2(g, c, rfinal, func(c, rf string) string {
return c + "->" + rf
})
final.Node().SetLabel("final")
o := MustObserve(g, final)
err := g.Stabilize(ctx)
testutil.Nil(t, err)
err = dumpDot(g, homedir("bind_nested_00.png"))
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->c->final", o.Value())
cv.Set("b")
_ = g.Stabilize(ctx)
err = dumpDot(g, homedir("bind_nested_01.png"))
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->b->c->final", o.Value())
bv.Set("b")
_ = g.Stabilize(ctx)
err = dumpDot(g, homedir("bind_nested_02.png"))
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a1-0+a1-1->b->c->final", o.Value())
bv.Set("a")
_ = g.Stabilize(ctx)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->b->c->final", o.Value())
cv.Set("a")
_ = g.Stabilize(ctx)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->c->final", o.Value())
}
func Test_Bind_nested_unlinksBind(t *testing.T) {
ctx := testContext()
g := New()
a00v := Var(g, "a00")
a00v.Node().SetLabel("a00v")
a00 := Bind(g, a00v, func(bs Scope, _ string) Incr[string] {
return Return(bs, "a00")
})
a00.Node().SetLabel("a00")
a01v := Var(g, "a01")
a01v.Node().SetLabel("a01v")
a01 := Bind(g, a01v, func(_ Scope, _ string) Incr[string] {
return a00
})
a01.Node().SetLabel("a01")
b00v := Var(g, "b00")
b00v.Node().SetLabel("b11v")
b00 := Bind(g, b00v, func(bs Scope, _ string) Incr[string] {
return Return(bs, "b00")
})
b00.Node().SetLabel("b00")
b01v := Var(g, "b01")
b01v.Node().SetLabel("b01v")
b01 := Bind(g, b01v, func(bs Scope, _ string) Incr[string] {
return b00
})
b01.Node().SetLabel("b01")
bindv := Var(g, "a")
bindv.Node().SetLabel("bv")
bind := Bind(g, bindv, func(bs Scope, vv string) Incr[string] {
if vv == "a" {
return a01
}
return b01
})
bind.Node().SetLabel("b")
o := MustObserve(g, bind)
err := g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Nil(t, dumpDot(g, homedir("bind_unobserve_00_base.png")))
testutil.Equal(t, "a00", o.Value())
testutil.Equal(t, true, g.Has(a00))
testutil.Equal(t, true, g.Has(a01))
testutil.Equal(t, false, g.Has(b00))
testutil.Equal(t, false, g.Has(b01))
bindv.Set("b")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Nil(t, dumpDot(g, homedir("bind_unobserve_01_switch_b.png")))
testutil.Equal(t, "b00", o.Value())
testutil.Equal(t, false, g.Has(a00))
testutil.Equal(t, false, g.Has(a01))
testutil.Equal(t, true, g.Has(b00))
testutil.Equal(t, true, g.Has(b01))
bindv.Set("a")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Nil(t, dumpDot(g, homedir("bind_unobserve_02_switch_a.png")))
testutil.Equal(t, "a00", a01.Value())
testutil.Equal(t, "a00", o.Value())
testutil.Equal(t, true, g.Has(a00))
testutil.Equal(t, true, g.Has(a01))
testutil.Equal(t, false, g.Has(b00))
testutil.Equal(t, false, g.Has(b01))
}
func Test_Bind_nested_bindCreatesBind(t *testing.T) {
ctx := testContext()
g := New()
cv := Var(g, "a")
cv.Node().SetLabel("cv")
bv := Var(g, "a")
bv.Node().SetLabel("bv")
c := BindContext[string](g, cv, func(_ context.Context, bs Scope, _ string) (Incr[string], error) {
a0 := createDynamicMaps(bs, "a0")
a1 := createDynamicMaps(bs, "a1")
bind := BindContext(bs, bv, func(_ context.Context, bs Scope, which string) (Incr[string], error) {
switch which {
case "a":
return Map(bs, a0, func(v string) string {
return v + "->" + "b"
}), nil
case "b":
return Map(bs, a1, func(v string) string {
return v + "->" + "b"
}), nil
default:
return nil, fmt.Errorf("invalid bind node selector: %v", which)
}
})
bind.Node().SetLabel(fmt.Sprintf("bind - %s", "b"))
return bind, nil
})
c.Node().SetLabel("c")
final := Map2(g, c, Return(g, "final"), func(a, b string) string {
return a + "->" + b
})
o := MustObserve(g, final)
err := g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->b->final", o.Value())
cv.Set("b")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->b->final", o.Value())
bv.Set("b")
err = g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a1-0+a1-1->b->final", o.Value())
bv.Set("a")
err = g.Stabilize(testContext())
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->b->final", o.Value())
cv.Set("a")
err = g.Stabilize(testContext())
testutil.Nil(t, err)
testutil.Nil(t, g.recomputeHeap.sanityCheck())
testutil.Equal(t, "a0-0+a0-1->b->final", o.Value())
}
func Test_Bind_nested_bindHeightsChange(t *testing.T) {
ctx := testContext()
g := New()
driver01var := Var(g, "a")
driver01var.Node().SetLabel("driver01var")
driver01 := Bind(g, driver01var, func(bs Scope, _ string) Incr[string] {
r := Return(bs, "driver01")
r.Node().SetLabel("driver01return")
return r
})
driver01.Node().SetLabel("driver01")
driver02var := Var(g, "a")
driver02var.Node().SetLabel("driver02var")
driver02 := Bind(g, driver02var, func(_ Scope, _ string) Incr[string] {
return driver01
})
driver02.Node().SetLabel("driver02")
m2 := Map2(g, driver01, driver02, concat)
m2.Node().SetLabel("m2")
o := MustObserve(g, m2)
o.Node().SetLabel("observem2")
err := g.Stabilize(ctx)
testutil.Nil(t, err)
testutil.Nil(t, dumpDot(g, homedir("bind_user_00.png")))
testutil.Equal(t, "driver01driver01", o.Value())
}
func Test_Bind_regression(t *testing.T) {
ctx := testContext()
graph, o := makeRegressionGraph(ctx)
_ = graph.Stabilize(ctx)
_ = dumpDot(graph, homedir("bind_regression.png"))
testutil.NotNil(t, o.Value())
testutil.Equal(t, 24, *o.Value())
}
func Test_Bind_regression_parallel(t *testing.T) {
ctx := testContext()
graph, o := makeRegressionGraph(ctx)
_ = graph.ParallelStabilize(ctx)
_ = dumpDot(graph, homedir("bind_regression.png"))
testutil.NotNil(t, o.Value())
testutil.Equal(t, 24, *o.Value())
}
func makeRegressionGraph(_ context.Context) (*Graph, ObserveIncr[*int]) {
cacheMu := sync.Mutex{}
cache := make(map[string]Incr[*int])
getCached := func(key string) (out Incr[*int], ok bool) {
cacheMu.Lock()
out, ok = cache[key]
cacheMu.Unlock()
return
}
setCached := func(key string, i Incr[*int]) {
cacheMu.Lock()
cache[key] = i
cacheMu.Unlock()
}
graph := New()
fakeFormula := Var(graph, "fakeformula")
fakeFormula.Node().SetLabel("fakeformula")
var f func(Scope, int) Incr[*int]
f = func(bs Scope, t int) Incr[*int] {
key := fmt.Sprintf("f-%d", t)
if cached, ok := getCached(key); ok {
return WithinScope(bs, cached)
}
r := Bind(bs, fakeFormula, func(bs Scope, formula string) Incr[*int] {
key := fmt.Sprintf("map-f-%d", t)
if cached, ok := getCached(key); ok {
return WithinScope(bs, cached)
}
if t == 0 {
out := 0
r := Return(bs, &out)
r.Node().SetLabel("f-0")
return r
}
bindOutput := Map(bs, f(bs, t-1), func(r *int) *int {
out := *r + 1
return &out
})
bindOutput.Node().SetLabel(fmt.Sprintf("map-f-%d", t))
setCached(key, bindOutput)
return bindOutput
})
r.Node().SetLabel(key)
setCached(key, r)
return r
}
g := func(bs Scope, t int) Incr[*int] {
key := fmt.Sprintf("g-%d", t)
if cached, ok := getCached(key); ok {
return WithinScope(bs, cached)
}
r := Bind(bs, fakeFormula, func(bs Scope, formula string) Incr[*int] {
output := f(bs, t)
return output
})
r.Node().SetLabel(key)
setCached(key, r)
return r
}
h := func(bs Scope, t int) Incr[*int] {
b := Bind(bs, fakeFormula, func(bs Scope, formula string) Incr[*int] {
hr := Return(bs, 10)
hr.Node().SetLabel(fmt.Sprintf("h-r-%d", t))
hm2 := Map2(bs, g(bs, t), hr, func(l *int, r int) *int {
if l == nil {
return nil
}
out := *l * r
return &out
})
hm2.Node().SetLabel("h-m2")
return hm2
})
b.Node().SetLabel(fmt.Sprintf("h-%d", 2))
return b
}
o := Map3(graph, f(graph, 2), g(graph, 2), h(graph, 2), func(first *int, second *int, third *int) *int {
if first == nil || second == nil || third == nil {
return nil
}
out := *first + *second + *third
return &out
})
o.Node().SetLabel("map3-final")
return graph, MustObserve(graph, o)
}
func Test_Bind_regression_nested(t *testing.T) {
graph := New()
fakeFormula := Var(graph, "fakeFormula")
cache := make(map[string]Incr[*int])
var f func(Scope, int) Incr[*int]
f = func(bs Scope, t int) Incr[*int] {
key := fmt.Sprintf("f-%d", t)
if _, ok := cache[key]; ok {
return WithinScope(bs, cache[key])
}
r := Bind(bs, fakeFormula, func(bs Scope, formula string) Incr[*int] {
key := fmt.Sprintf("map-f-%d", t)
if _, ok := cache[key]; ok {
return WithinScope(bs, cache[key])
}
if t == 0 {
out := 0
r := Return(bs, &out)
r.Node().SetLabel("f-0")
return r
}
bindOutput := Map(bs, f(bs, t-1), func(r *int) *int {
out := *r + 1
return &out
})
bindOutput.Node().SetLabel(fmt.Sprintf("map-f-%d", t))
cache[key] = bindOutput
return bindOutput
})
r.Node().SetLabel(key)
cache[key] = r
return r
}
b := func(bs Scope, t int) Incr[*int] {
key := fmt.Sprintf("b-%d", t)
if _, ok := cache[key]; ok {
return cache[key]
}
r := Bind(bs, fakeFormula, func(bs Scope, formula string) Incr[*int] {
return Map2(bs, f(bs, t), f(bs, t+2), func(l *int, r *int) *int {
out := *l * *r
return &out
})
})
cache[key] = r
return r
}
o := b(graph, 5)
_ = MustObserve(graph, o)
ctx := testContext()
err := graph.Stabilize(ctx)
testutil.Nil(t, err)
testutil.NotNil(t, o.Value())
testutil.Equal(t, 35, *o.Value())
}
func Test_Bind_unbindRegression(t *testing.T) {
graph := New()
fakeFormula := Var(graph, "fakeFormula")
cache := make(map[string]Incr[*int])
var m func(bs Scope, t int) Incr[*int]
left_bound := 3
right_bound := 9
m = func(bs Scope, t int) Incr[*int] {
key := fmt.Sprintf("m-%d", t)
if _, ok := cache[key]; ok {
return WithinScope(bs, cache[key])
}
r := Bind(bs, fakeFormula, func(bs Scope, formula string) Incr[*int] {
if t == 0 {
out := 0
r := Return(bs, &out)
r.Node().SetLabel("m-0")
return r
}
var bindOutput Incr[*int]
offset := 1
if t >= left_bound && t < right_bound {
li := m(bs, t-1)
bindOutput = Map2(bs, li, Return(bs, &offset), func(l *int, r *int) *int {
if l == nil || r == nil {
return nil
}
out := *l + *r
return &out
})
} else {
bindOutput = m(bs, t-1)
}
bindOutput.Node().SetLabel(fmt.Sprintf("%s-output", key))
return bindOutput
})
r.Node().SetLabel(fmt.Sprintf("m(%d)", t))
cache[key] = r
return r
}
t.Run("m(0) = 0; if 3 <= t < 9, m(t) = m(t-1) + 1 else m(t) = m(t-1) - passes", func(t *testing.T) {
o := m(graph, 9)
_ = MustObserve(graph, o)
ctx := testContext()
err := graph.Stabilize(ctx)
testutil.Nil(t, err)
testutil.NotNil(t, o.Value())
testutil.Equal(t, 6, *o.Value())
graph.SetStale(fakeFormula)
err = graph.Stabilize(ctx)
testutil.Nil(t, err)
_ = dumpDot(graph, homedir("bind_unbind_regression_00.png"))
testutil.NotNil(t, o.Value())
testutil.Equal(t, 6, *o.Value())
})
}
func Test_Bind_boundChange_doesntCauseRebind(t *testing.T) {
ctx := testContext()
g := New()
v0 := Var(g, "foo")
v0.Node().SetLabel("v0")
m0 := Map(g, v0, ident)
m0.Node().SetLabel("m0")
var bindUpdates int
bv := Var(g, "a")
b := Bind(g, bv, func(bs Scope, _ string) Incr[string] {
bindUpdates++
return m0
})
b.Node().SetLabel("b")
m1 := Map(g, b, ident)
m1.Node().SetLabel("m1")
var m1Updates int
m1.Node().OnUpdate(func(_ context.Context) {
m1Updates++
})
o := MustObserve(g, m1)
err := g.Stabilize(ctx)
testutil.NoError(t, err)
testutil.Equal(t, "foo", o.Value())
testutil.Equal(t, 1, bindUpdates)
testutil.Equal(t, 1, m1Updates)
v0.Set("not-foo")
err = g.Stabilize(ctx)
testutil.NoError(t, err)
testutil.Equal(t, 1, bindUpdates)
testutil.Equal(t, 2, m1Updates)
testutil.Equal(t, "not-foo", o.Value())
}
func Test_Bind_nestedScopeHasGraph(t *testing.T) {
ctx := testContext()
g := New()
bv := Var(g, "a")
var ibv00, ibv01 VarIncr[string]
b := Bind(g, bv, func(bindScope Scope, bvv string) Incr[string] {
ibv00 = Var(bindScope, bvv)
return Bind(bindScope, ibv00, func(bindScope Scope, ibvv string) Incr[string] {
ibv01 = Var(bindScope, ibvv)
return Map2(bindScope, ibv00, ibv01, concat)
})
})
ob := MustObserve(g, b)
_ = g.Stabilize(ctx)
testutil.Equal(t, "aa", ob.Value())
testutil.NotNil(t, GraphForNode(ibv00))