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query.go
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query.go
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// Copyright 2015 Comcast Cable Communications Management, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// End Copyright
package core
import (
"bytes"
"encoding/json"
"fmt"
"strings"
"time"
)
// Replace all variables in the given pattern with their bindings
// (when possible).
func (bs *Bindings) Bind(ctx *Context, pat interface{}) interface{} {
switch v := pat.(type) {
case string:
if IsVariable(v) {
binding, found := (*bs)[v]
if found {
return interface{}(binding)
} else {
return pat
}
} else {
return v
}
case map[string]interface{}:
bound := make(map[string]interface{})
for k, x := range v {
bound[k] = bs.Bind(ctx, x)
}
return bound
case []interface{}:
bound := make([]interface{}, 0, len(v))
for _, x := range v {
bound = append(bound, bs.Bind(ctx, x))
}
return bound
default:
return pat
}
}
type QueryResult struct {
Bss []Bindings
Checked int
Elapsed int64
}
// Make a QueryResult that contains one empty Bindings.
func InitialQueryResult(ctx *Context) QueryResult {
qr := QueryResult{make([]Bindings, 0, 1), 0, 0}
qr.Bss = append(qr.Bss, make(map[string]interface{}))
return qr
}
type QueryContext struct {
// Or maybe map[string]interface{} ...
Locations []string
}
type Query interface {
Exec(*Context, *Location, QueryContext, QueryResult) (*QueryResult, error)
}
func ExecQuery(ctx *Context, q Query, loc *Location, qc QueryContext, qr QueryResult) (*QueryResult, error) {
timer := NewTimer(ctx, "ExecQuery")
r, err := q.Exec(ctx, loc, qc, qr)
if r != nil {
r.Elapsed += timer.Stop()
}
return r, err
}
type CodeQuery struct {
Code string `json:"code"`
Language string `json:"language,omitempty"`
Libraries []string `json:"libraries,omitempty"`
compiledCode interface{}
}
// Strips '?' from variables. Warn if no '?'.
func (bs *Bindings) StripQuestionMarks(ctx *Context) *Bindings {
acc := make(Bindings)
for k, v := range *bs {
if len(k) == 0 {
Log(DEBUG, ctx, "Bindings.StripQuestionMarks", "warning", "nil variable", "bs", bs)
continue
}
c := k[0]
if c != '?' {
Log(DEBUG, ctx, "Bindings.StripQuestionMarks", "warning", "unmarked variable", "k", k)
acc[k] = v
} else {
acc[k[1:]] = v
}
}
return &acc
}
func isURL(library string) bool {
// ToDo: Do better.
return strings.HasPrefix(library, "http")
}
// fetchLibrary attempts to obtain code for the given library.
//
// The given library can be a URL, a name that resolves to a URL via
// location.GetConfig().Libraries, or even explicit Javascript code.
func (loc *Location) fetchLibrary(ctx *Context, library string) (string, error) {
var uri string
var comment string
if isURL(library) {
uri = library
comment += fmt.Sprintf("// Library is URL '%s'\n", library)
Log(INFO, ctx, "core.fetchLibrary", "library", library, "isURL", true)
} else {
libs := loc.Control().Libraries
if libs == nil {
err := fmt.Errorf("No Libraries for library '%s'", library)
Log(ERROR|USR, ctx, "core.fetchLibrary", "library", library, "error", err)
return "", err
}
uri, _ = libs[library]
}
var code string
if isURL(uri) {
Log(INFO, ctx, "core.fetchLibrary", "library", library, "uri", uri)
var err error
code, err = CachedSlurp(ctx, uri)
if err != nil {
Log(ERROR|APP, ctx, "core.fetchLibrary", "uri", uri,
"error", err, "when", "slurp", "library", library)
return "", err
}
} else {
// For now, not an error.
// Better be code.
Log(DEBUG, ctx, "core.fetchLibrary", "library", library, "code", true)
comment += fmt.Sprintf("// Library is explicit code\n")
code = uri
}
return comment + "\n" + code, nil
}
// getLibraryCode gathers up all library code.
//
// The code is concatenated (in order) and returned. Uses
// 'fetchLibrary()' for resolution.
func (loc *Location) getLibraryCode(ctx *Context, libraries []string) (string, error) {
var code string
for i, library := range libraries {
moreCode, err := loc.fetchLibrary(ctx, library)
if err != nil {
return "", err
}
code += fmt.Sprintf("// Library %s (%d)\n", library, i)
code += moreCode
code += fmt.Sprintf("// Library %s (%d) end\n\n", library, i)
}
Log(INFO, ctx, "core.getLibraryCode", "foundChars", len(code))
return code, nil
}
func (c *CodeQuery) GetCompiledCode(ctx *Context, loc *Location) (interface{}, error) {
var err error
if nil == c.compiledCode {
c.compiledCode, err = CompileJavascript(ctx, loc, c.Libraries, c.Code)
}
return c.compiledCode, err
}
func (c CodeQuery) Exec(ctx *Context, loc *Location, qc QueryContext, qr QueryResult) (*QueryResult, error) {
Log(INFO, ctx, "CodeQuery.Exec")
timer := NewTimer(ctx, "CodeQuery.Exec")
defer timer.Stop()
acc := QueryResult{make([]Bindings, 0, 0), qr.Checked, qr.Elapsed}
script, err := c.GetCompiledCode(ctx, loc)
if err != nil {
return nil, err
}
// ToDo: Somehow reuse Javascript runtimes to avoid re-loading code.
for _, bs := range qr.Bss {
Log(DEBUG, ctx, "CodeQuery.Exec", "script", script, "bs", bs)
var props map[string]interface{}
if loc != nil {
c := loc.Control()
if c != nil && c.CodeProps != nil {
props = c.CodeProps
}
}
maybeCopyEvent(bs)
x, err := RunJavascript(ctx, bs.StripQuestionMarks(ctx), props, script)
if err != nil {
Log(WARN, ctx, "CodeQuery.Exec", "error", err)
return nil, err
}
Log(DEBUG, ctx, "CodeQuery.Exec", "got", Gorep(x), "type", fmt.Sprintf("%T", x))
switch vv := x.(type) {
case bool:
if vv == true {
acc.Bss = append(acc.Bss, bs)
}
case map[string]interface{}:
// Additional bindings!
more := make(map[string]interface{})
for p, v := range bs {
more[p] = v
}
for p, v := range vv {
more["?"+p] = v
Log(DEBUG, ctx, "CodeQuery.Exec", "binding", p, "value", v)
}
acc.Bss = append(acc.Bss, more)
default:
if x != nil {
acc.Bss = append(acc.Bss, bs)
}
}
}
return &acc, nil
}
func getLocationsFromMap(ctx *Context, m map[string]interface{}) ([]string, error) {
var locations []string
location, given := m["location"]
if given {
s, ok := location.(string)
if !ok {
return nil, fmt.Errorf("%#v is not a string", location)
}
locations = append(locations, s)
}
ls, given := m["locations"]
if given {
switch locs := ls.(type) {
case []interface{}:
for _, l := range locs {
loc, ok := l.(string)
if !ok {
return nil, fmt.Errorf("location %#v should be a string", l)
}
locations = append(locations, loc)
}
case []string:
for _, loc := range locs {
locations = append(locations, loc)
}
default:
return nil, fmt.Errorf("locations %#v should be an array of strings", ls)
}
}
return locations, nil
}
func CodeQueryFromMap(ctx *Context, m map[string]interface{}) (Query, bool, error) {
var q CodeQuery
code, ok := m["code"]
if !ok {
return nil, false, nil
}
switch vv := code.(type) {
case string:
q.Code = vv
case []interface{}:
for _, x := range vv {
s, ok := x.(string)
if !ok {
return nil, false, fmt.Errorf("%#v is not a string", code)
}
q.Code += s + "\n"
}
case []string:
for _, s := range vv {
q.Code += s + "\n"
}
default:
return nil, false, fmt.Errorf("%#v is not a string", code)
}
q.Libraries = make([]string, 0, 0)
libraries, ok := m["libraries"]
if ok {
switch vv := libraries.(type) {
case []interface{}:
for _, library := range vv {
switch s := library.(type) {
case string:
q.Libraries = append(q.Libraries, s)
default:
err := fmt.Errorf("library should be a string, not %T (%#v)",
library, library)
Log(DEBUG, ctx, "core.CodeQueryFromMap", "error", err)
return nil, true, err
}
}
default:
err := fmt.Errorf("libraries should be an array of strings, not %T (%#v)",
libraries, libraries)
Log(ERROR, ctx, "core.CodeQueryFromMap", "error", err)
return nil, true, err
}
}
Log(DEBUG, ctx, "core.CodeQueryFromMap", "libraries", q.Libraries)
// Only for validation:
var location *Location
// Won't have a ctx due to UnmarshalJSON path.
if ctx != nil {
location = ctx.GetLoc()
}
_, err := q.GetCompiledCode(ctx, location)
if nil != err {
return nil, true, err
}
Log(DEBUG, ctx, "core.CodeQueryFromMap", "query", q)
return q, true, nil
}
type EmptyQuery struct {
}
func (p EmptyQuery) Exec(ctx *Context, loc *Location, qc QueryContext, qr QueryResult) (*QueryResult, error) {
Log(DEBUG, ctx, "EmptyQuery.Exec", "qr", qr, "Bss", qr.Bss)
acc := QueryResult{qr.Bss, qr.Checked, qr.Elapsed}
return &acc, nil
}
type PatternQuery struct {
Pattern map[string]interface{} `json:"pattern"`
Locations []string `json:"locations,omitempty"`
}
type FactService interface {
Search(ctx *Context, pattern Map) (*SearchResults, error)
}
// Want anonymous interface implementations.
type FactServiceFromURI struct {
URI string
Timeout time.Duration
}
func (s *FactServiceFromURI) Search(ctx *Context, pattern Map) (*SearchResults, error) {
op := "core.FactServiceFromURI.Search"
Log(DEBUG, ctx, op, "pattern", pattern)
js, err := json.Marshal(&pattern)
if err != nil {
return nil, err
}
then := Now()
body, err := Post(ctx, s.URI, "application/json", string(js))
if err != nil {
Log(ERROR, ctx, op, "error", err, "when", "Post")
return nil, err
}
Log(DEBUG, ctx, op, "response", body)
srs := new(SearchResults)
err = json.Unmarshal([]byte(body), srs)
// Overwrite .Elapsed? FS should use another key.
srs.Elapsed = Now() - then
if err != nil {
Log(ERROR, ctx, op, "error", err, "when", "unmarshall", "json", string(body))
return nil, err
}
return srs, nil
}
// External fact service access
func (loc *Location) SearchRemoteFacts(ctx *Context, target string, pattern Map) (*SearchResults, error) {
op := "core.SearchFactsAtRemoteLocation"
Log(INFO, ctx, op, "target", target, "pattern", pattern)
// First check to see if we have an internal fact service.
c := loc.Control()
if c != nil {
ifss := c.InternalFactServices
if ifss != nil {
ifs, have := ifss[target]
Log(DEBUG, ctx, op, "invoking", have)
if have {
return ifs.Search(ctx, pattern)
}
}
}
// External fact service.
target, err := loc.ResolveService(ctx, target)
if err != nil {
return nil, err
}
Log(DEBUG, ctx, op, "resolved", target)
timeout := 10 * time.Second
ctl := loc.Control()
if ctl != nil {
timeout = time.Duration(ctl.ExternalFactServiceTimeout)
}
Log(INFO, ctx, op, "timeout", timeout)
fs := FactServiceFromURI{target, timeout}
return fs.Search(ctx, pattern)
}
func (loc *Location) SearchLocations(ctx *Context, locations []string, pattern map[string]interface{}) (*SearchResults, error) {
Log(INFO, ctx, "Location.SearchLocation", "locations", locations, "pattern", pattern)
if len(locations) == 0 {
Log(WARN, ctx, "Location.SearchLocation", "locations", "none provided")
locations = append(locations, loc.Name)
}
srs := new(SearchResults)
srs.Found = make([]SearchResult, 0, 0)
for _, location := range locations {
var more *SearchResults
var err error
if location == loc.Name {
more, err = loc.SearchFacts(ctx, pattern, true)
} else {
more, err = loc.SearchRemoteFacts(ctx, location, pattern)
}
if err != nil {
Log(ERROR, ctx, "System.SearchLocation", "error", err)
return nil, err
}
for _, sr := range more.Found {
Log(DEBUG, ctx, "System.SearchLocations", "sr", sr)
srs.Found = append(srs.Found, sr)
}
srs.Checked += more.Checked
}
Log(DEBUG, ctx, "System.SearchLocations", "locations", locations, "pattern", pattern, "results", *srs)
return srs, nil
}
// Copy the given bindings into a new set of bindings.
func ExtendBindings(ctx *Context, x *Bindings, y *Bindings) *Bindings {
acc := make(Bindings)
for k, v := range *x {
acc[k] = v
}
for k, v := range *y {
prev, have := acc[k]
if have {
Log(DEBUG, ctx, "core.ExtendBindings", "x", *x, "y", *y, "warning",
fmt.Sprintf("replacing %v=%v with %v in %v", k, prev, v, acc))
}
acc[k] = v
}
return &acc
}
func (p PatternQuery) Exec(ctx *Context, loc *Location, qc QueryContext, qr QueryResult) (*QueryResult, error) {
Log(DEBUG, ctx, "PatternQuery.Exec", "locations", p.Locations, "pattern", p.Pattern, "qr", qr)
acc := QueryResult{make([]Bindings, 0, 0), qr.Checked, qr.Elapsed}
// ToDo: Add to elapsed in QueryResult
for _, bs := range qr.Bss {
bound := bs.Bind(ctx, interface{}(p.Pattern))
// qc.locations are from the triggering event
// locations for PatternQuery are used to get multiple bindgings for each location
locations := p.Locations
if len(locations) == 0 {
locations = qc.Locations
}
m, ok := bound.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("%#v isn't a map[string]interface{}", bound)
}
srs, err := loc.SearchLocations(ctx, locations, m)
if err != nil {
return nil, err
}
// create bindings for each location
for _, sr := range srs.Found {
for _, more := range sr.Bindingss {
extended := ExtendBindings(ctx, &bs, &more)
acc.Bss = append(acc.Bss, *extended)
}
}
}
Log(DEBUG, ctx, "PatternQuery.Exec", "results", acc)
return &acc, nil
}
func PatternQueryFromMap(ctx *Context, m map[string]interface{}) (Query, bool, error) {
var q PatternQuery
pattern, ok := m["pattern"]
if !ok {
Log(DEBUG, ctx, "core.PatternQueryFromMap", "map", m, "msg", "no pattern")
return nil, false, NewSyntaxError("No pattern in map")
}
arg, ok := pattern.(map[string]interface{})
if !ok {
return nil, false, fmt.Errorf("%#v isn't a map[string]interface{}", pattern)
}
q.Pattern = arg
locs, err := getLocationsFromMap(ctx, m)
if err != nil {
return nil, false, err
}
q.Locations = locs
return q, true, nil
}
type AndQuery struct {
Conjuncts []Query
}
func (q AndQuery) MarshalJSON() ([]byte, error) {
buf := bytes.Buffer{}
buf.WriteString(`{"and":`)
js, err := json.Marshal(&q.Conjuncts)
if err != nil {
return nil, err
}
buf.Write(js)
buf.WriteString(`}`)
return buf.Bytes(), nil
}
func (a AndQuery) Exec(ctx *Context, loc *Location, qc QueryContext, qr QueryResult) (*QueryResult, error) {
switch len(a.Conjuncts) {
case 0:
return &qr, nil
default:
for _, q := range a.Conjuncts {
acc, err := q.Exec(ctx, loc, qc, qr)
if nil != err {
return nil, err
}
qr = *acc
}
return &qr, nil
}
}
func AndQueryFromMap(ctx *Context, m map[string]interface{}) (Query, bool, error) {
var q AndQuery
x, givenAnd := m["and"]
if !givenAnd {
return nil, false, nil
}
xs, ok := x.([]interface{})
if !ok {
return nil, false, fmt.Errorf("%#v isn't an []interface{}", x)
}
qs := make([]Query, 0, len(xs))
for _, x := range xs {
m, ok := x.(map[string]interface{})
if !ok {
return nil, false, fmt.Errorf("%#v isn't a map[string]interface{}", x)
}
got, err := ParseQuery(ctx, m)
if err != nil {
Log(WARN, ctx, "core.AndQueryFromMap", "error", err, "when", "bad subquery")
return nil, true, err
}
qs = append(qs, got)
}
q.Conjuncts = qs
// locations, givenLocations := m["locations"]
// if givenLocations {
// for _, i := range locations.([]interface{}) {
// q.locations = append(q.locations, i.(string))
// }
// } else {
// return nil, true, errors.New(fmt.Sprintf("Currently must provide 'locations' in %v.", m))
// }
Log(DEBUG, ctx, "core.AndQuery", "query", q)
return q, true, nil
}
type OrQuery struct {
Disjuncts []Query
ShortCircuit bool
}
func (q OrQuery) MarshalJSON() ([]byte, error) {
buf := bytes.Buffer{}
buf.WriteString(`{"or":`)
js, err := json.Marshal(&q.Disjuncts)
if err != nil {
return nil, err
}
buf.Write(js)
if q.ShortCircuit {
buf.WriteString(`,"shortCircuit": true`)
}
buf.WriteString(`}`)
return buf.Bytes(), nil
}
func (o OrQuery) Exec(ctx *Context, loc *Location, qc QueryContext, qr QueryResult) (*QueryResult, error) {
acc := QueryResult{make([]Bindings, 0, 0), qr.Checked, qr.Elapsed}
for _, bs := range qr.Bss {
qr := QueryResult{[]Bindings{bs}, 0, 0}
for _, q := range o.Disjuncts {
more, err := q.Exec(ctx, loc, qc, qr)
if nil != err {
return nil, err
}
acc.Bss = append(acc.Bss, more.Bss...)
if o.ShortCircuit && len(more.Bss) > 0 {
break
}
}
}
return &acc, nil
}
func OrQueryFromMap(ctx *Context, m map[string]interface{}) (Query, bool, error) {
var q OrQuery
x, givenOr := m["or"]
if !givenOr {
return nil, false, nil
}
xs, ok := x.([]interface{})
if !ok {
return nil, false, fmt.Errorf("%#v isn't a []interface{}", x)
}
qs := make([]Query, 0, len(xs))
for _, x := range xs {
m, ok := x.(map[string]interface{})
if !ok {
return nil, false, fmt.Errorf("%#v isn't a map[string]interface{}", x)
}
got, err := ParseQuery(ctx, m)
if err != nil {
Log(WARN, ctx, "core.OrQueryFromMap", "error", err, "when", "Bad subquery")
return nil, true, err
}
qs = append(qs, got)
}
q.Disjuncts = qs
for _, candidate := range []string{"shortCircuit", "ShortCircuit", "short_circuit", "shortcircuit"} {
sc, ok := m[candidate]
if ok {
scBool, ok := sc.(bool)
if ok {
q.ShortCircuit = scBool
break
}
return nil, false, fmt.Errorf("field %s: %v isn't a bool", candidate, sc)
}
}
return q, true, nil
}
type NotQuery struct {
Negated Query
}
func (q NotQuery) MarshalJSON() ([]byte, error) {
buf := bytes.Buffer{}
buf.WriteString(`{"not":`)
js, err := json.Marshal(&q.Negated)
if err != nil {
return nil, err
}
buf.Write(js)
buf.WriteString(`}`)
return buf.Bytes(), nil
}
func (o NotQuery) Exec(ctx *Context, loc *Location, qc QueryContext, qr QueryResult) (*QueryResult, error) {
// A little trick. Probably wrong: For each current Bindings,
// try the subquery. If that subquery fails, then keep the
// bindings. Otherwise discard them.
acc := make([]Bindings, 0, 0)
for _, candidate := range qr.Bss {
trial := QueryResult{[]Bindings{candidate}, 0, 0}
more, err := o.Negated.Exec(ctx, loc, qc, trial)
// ToDo: Add up Checked, Elapsed.
if err != nil {
return nil, err
}
if 0 == len(more.Bss) {
acc = append(acc, candidate)
}
}
return &QueryResult{acc, qr.Checked, qr.Elapsed}, nil
}
func NotQueryFromMap(ctx *Context, m map[string]interface{}) (Query, bool, error) {
x, givenNot := m["not"]
if !givenNot {
return nil, false, nil
}
arg, ok := x.(map[string]interface{})
if !ok {
return nil, true, fmt.Errorf("not takes a single argument (a map), not a %T", x)
}
subquery, err := ParseQuery(ctx, arg)
if err != nil {
return nil, true, err
}
q := NotQuery{subquery}
return q, true, nil
}
func ParseQuery(ctx *Context, m map[string]interface{}) (Query, error) {
Log(DEBUG, ctx, "core.ParseQuery", "map", fmt.Sprintf("%#v", m))
if len(m) == 0 {
return EmptyQuery{}, nil
}
q, applicable, err := CodeQueryFromMap(ctx, m)
if applicable {
if err != nil {
return nil, err
} else {
return q, nil
}
}
q, applicable, err = PatternQueryFromMap(ctx, m)
if applicable {
if err != nil {
return nil, err
} else {
return q, nil
}
}
q, applicable, err = AndQueryFromMap(ctx, m)
if applicable {
if err != nil {
return nil, err
} else {
return q, nil
}
}
q, applicable, err = OrQueryFromMap(ctx, m)
if applicable {
if err != nil {
return nil, err
} else {
return q, nil
}
}
q, applicable, err = NotQueryFromMap(ctx, m)
if applicable {
if err != nil {
return nil, err
} else {
return q, nil
}
}
Log(WARN, ctx, "core.ParseQuery", "error", "Can't parse.", "map", m)
return nil, NewSyntaxError("Can't handle %#v", m)
}
type GenericQuery struct {
ctx *Context
query Query
}
func (q *GenericQuery) MarshalJSON() ([]byte, error) {
return json.Marshal(&q.query)
}
func (q *GenericQuery) Get() Query {
if q == nil {
return nil
}
return q.query
}
func (q *GenericQuery) UnmarshalJSON(bs []byte) error {
var m map[string]interface{}
if err := json.Unmarshal(bs, &m); err != nil {
return err
}
query, err := ParseQuery(q.ctx, m)
if err != nil {
return err
}
q.query = query
return nil
}