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set.go
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set.go
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package library
import (
"errors"
"github.com/nytlabs/gojee" // jee
"github.com/nytlabs/streamtools/st/blocks" // blocks
"github.com/nytlabs/streamtools/st/util" // util
)
// specify those channels we're going to use to communicate with streamtools
type Set struct {
blocks.Block
queryrule chan chan interface{}
inrule chan interface{}
add chan interface{}
isMember chan interface{}
cardinality chan chan interface{}
out chan interface{}
quit chan interface{}
}
// we need to build a simple factory so that streamtools can make new blocks of this kind
func NewSet() blocks.BlockInterface {
return &Set{}
}
// Setup is called once before running the block. We build up the channels and specify what kind of block this is.
func (b *Set) Setup() {
b.Kind = "Set"
b.Desc = "add, ismember and cardinality routes on a stored set of values"
// set operations
b.add = b.InRoute("add")
b.isMember = b.InRoute("isMember")
b.cardinality = b.QueryRoute("cardinality")
b.inrule = b.InRoute("rule")
b.queryrule = b.QueryRoute("rule")
b.quit = b.Quit()
b.out = b.Broadcast()
}
// Run is the block's main loop. Here we listen on the different channels we set up.
func (b *Set) Run() {
var path string
set := make(map[interface{}]bool)
var tree *jee.TokenTree
var err error
for {
select {
case ruleI := <-b.inrule:
// set a parameter of the block
path, err = util.ParseString(ruleI, "Path")
tree, err = util.BuildTokenTree(path)
if err != nil {
b.Error(err)
break
}
case <-b.quit:
// quit the block
return
case msg := <-b.add:
if tree == nil {
continue
}
v, err := jee.Eval(tree, msg)
if err != nil {
b.Error(err)
break
}
if _, ok := v.(string); !ok {
b.Error(errors.New("can only build sets of strings"))
continue
}
set[v] = true
// deal with inbound data
case msg := <-b.isMember:
if tree == nil {
continue
}
v, err := jee.Eval(tree, msg)
if err != nil {
b.Error(err)
break
}
_, ok := set[v]
b.out <- map[string]interface{}{
"isMember": ok,
}
case c := <-b.cardinality:
c <- map[string]interface{}{
"cardinality": len(set),
}
case c := <-b.queryrule:
// deal with a query request
c <- map[string]interface{}{
"Path": path,
}
}
}
}