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api.go
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api.go
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// Package core provides an API to include and use the GraphJin compiler with your own code.
// For detailed documentation visit https://graphjin.com
//
// Example usage:
/*
package main
import (
"database/sql"
"fmt"
"time"
"github.com/dosco/graphjin/core"
_ "github.com/jackc/pgx/v4/stdlib"
)
func main() {
db, err := sql.Open("pgx", "postgres://postgrs:@localhost:5432/example_db")
if err != nil {
log.Fatal(err)
}
gj, err := core.NewGraphJin(nil, db)
if err != nil {
log.Fatal(err)
}
query := `
query {
posts {
id
title
}
}`
ctx = context.WithValue(ctx, core.UserIDKey, 1)
res, err := gj.GraphQL(ctx, query, nil)
if err != nil {
log.Fatal(err)
}
}
*/
package core
import (
"context"
"crypto/sha256"
"database/sql"
"encoding/json"
"errors"
"fmt"
_log "log"
"os"
"sync"
"sync/atomic"
"github.com/chirino/graphql"
"github.com/dop251/goja"
"github.com/dosco/graphjin/core/internal/allow"
"github.com/dosco/graphjin/core/internal/graph"
"github.com/dosco/graphjin/core/internal/psql"
"github.com/dosco/graphjin/core/internal/qcode"
"github.com/dosco/graphjin/core/internal/sdata"
"github.com/dosco/graphjin/core/internal/util"
"github.com/spf13/afero"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/trace"
)
type contextkey int
// Constants to set values on the context passed to the NewGraphJin function
const (
// Name of the authentication provider. Eg. google, github, etc
UserIDProviderKey contextkey = iota
// The raw user id (jwt sub) value
UserIDRawKey
// User ID value for authenticated users
UserIDKey
// User role if pre-defined
UserRoleKey
)
// GraphJin struct is an instance of the GraphJin engine it holds all the required information like
// datase schemas, relationships, etc that the GraphQL to SQL compiler would need to do it's job.
type graphjin struct {
conf *Config
db *sql.DB
log *_log.Logger
fs afero.Fs
dbtype string
dbinfo *sdata.DBInfo
schema *sdata.DBSchema
allowList *allow.List
encKey [32]byte
encKeySet bool
apq apqCache
queries map[string]*queryComp
roles map[string]*Role
roleStmt string
roleStmtMD psql.Metadata
rmap map[string]resItem
abacEnabled bool
qc *qcode.Compiler
pc *psql.Compiler
ge *graphql.Engine
subs sync.Map
scripts sync.Map
prod bool
namespace string
tracer trace.Tracer
babelInit bool
}
type GraphJin struct {
atomic.Value
}
type script struct {
util.Once
ReqFunc reqFunc
RespFunc respFunc
vm *goja.Runtime
}
type Option func(*graphjin) error
var (
errPersistedQueryNotFound = errors.New("persisted query not found")
)
// NewGraphJin creates the GraphJin struct, this involves querying the database to learn its
// schemas and relationships
func NewGraphJin(conf *Config, db *sql.DB, options ...Option) (*GraphJin, error) {
gj, err := newGraphJin(conf, db, nil, options...)
if err != nil {
return nil, err
}
g := &GraphJin{}
g.Store(gj)
if err := g.initDBWatcher(); err != nil {
return nil, err
}
return g, nil
}
// newGraphJin helps with writing tests and benchmarks
func newGraphJin(conf *Config, db *sql.DB, dbinfo *sdata.DBInfo, options ...Option) (*graphjin, error) {
if conf == nil {
conf = &Config{Debug: true, DisableAllowList: true}
}
gj := &graphjin{
conf: conf,
db: db,
dbinfo: dbinfo,
log: _log.New(os.Stdout, "", 0),
prod: conf.Production || os.Getenv("GO_ENV") == "production",
tracer: otel.Tracer("graphjin.com/core"),
}
if err := gj.initAPQCache(); err != nil {
return nil, err
}
//order matters, do not re-order the initializers
if err := gj.initConfig(); err != nil {
return nil, err
}
for _, op := range options {
if err := op(gj); err != nil {
return nil, err
}
}
if err := gj.initFS(); err != nil {
return nil, err
}
if err := gj.initDiscover(); err != nil {
return nil, err
}
if err := gj.initResolvers(); err != nil {
return nil, err
}
if err := gj.initSchema(); err != nil {
return nil, err
}
if err := gj.initAllowList(); err != nil {
return nil, err
}
if err := gj.initCompilers(); err != nil {
return nil, err
}
if err := gj.initGraphQLEgine(); err != nil {
return nil, err
}
if err := gj.prepareRoleStmt(); err != nil {
return nil, err
}
if err := gj.initScripting(); err != nil {
return nil, err
}
if conf.SecretKey != "" {
sk := sha256.Sum256([]byte(conf.SecretKey))
gj.encKey = sk
gj.encKeySet = true
}
return gj, nil
}
func OptionSetNamespace(namespace string) Option {
return func(s *graphjin) error {
s.namespace = namespace
return nil
}
}
func OptionSetFS(fs afero.Fs) Option {
return func(s *graphjin) error {
s.fs = fs
return nil
}
}
type Error struct {
Message string `json:"message"`
}
// Result struct contains the output of the GraphQL function this includes resulting json from the
// database query and any error information
type Result struct {
ns string
op qcode.QType
name string
sql string
role string
cacheControl string
Errors []Error `json:"errors,omitempty"`
Vars json.RawMessage `json:"-"`
Data json.RawMessage `json:"data,omitempty"`
// Extensions *extensions `json:"extensions,omitempty"`
}
type Namespace struct {
Name string
Set bool
}
// ReqConfig is used to pass request specific config values to the GraphQLEx and SubscribeEx functions. Dynamic variables can be set here.
type ReqConfig struct {
// Namespace is used to namespace requests within a single instance of GraphJin. For example queries with the same name
// can exist in allow list in seperate namespaces.
Namespace Namespace
// APQKey is set when using GraphJin with automatic persisted queries
APQKey string
// Pass additional variables complex variables such as functions that return string values.
Vars map[string]interface{}
}
// GraphQL function is called on the GraphJin struct to convert the provided GraphQL query into an
// SQL query and execute it on the database. In production mode prepared statements are directly used
// and no query compiling takes places.
//
// In developer mode all names queries are saved into a file `allow.list` and in production mode only
// queries from this file can be run.
func (g *GraphJin) GraphQL(
c context.Context,
query string,
vars json.RawMessage,
rc *ReqConfig) (*Result, error) {
var err error
var op qcode.QType
var name string
gj := g.Load().(*graphjin)
ns := gj.namespace
if rc != nil && rc.Namespace.Set {
ns = rc.Namespace.Name
}
if rc != nil && rc.APQKey != "" && query == "" {
if v, ok := gj.apq.Get(ns, rc.APQKey); ok {
query = v.query
op = v.op
name = v.name
} else {
return nil, errPersistedQueryNotFound
}
} else {
if h, err := graph.FastParse(query); err == nil {
op = qcode.GetQType(h.Type)
name = h.Name
} else {
return nil, err
}
}
// use the chirino/graphql library for introspection queries
// disabled when allow list is enforced
if !gj.prod && name == "IntrospectionQuery" {
r := gj.ge.ServeGraphQL(&graphql.Request{Query: query})
if err := r.Error(); err != nil {
return errResult(ns, op, name, err), err
}
res := &Result{
ns: ns,
op: op,
name: name,
Data: r.Data,
}
return res, nil
}
if err != nil {
return errResult(ns, op, name, err), err
}
var varMap map[string]interface{}
if len(vars) != 0 {
if err := json.Unmarshal(vars, &varMap); err != nil {
return errResult(ns, op, name, err), err
}
}
qc, res, err := gj.graphQL(c, op, ns, name, query, vars, rc)
if err != nil {
return res, err
}
if rc != nil && rc.APQKey != "" {
gj.apq.Set(ns, rc.APQKey, apqInfo{
op: op,
name: name,
query: query,
})
}
if !gj.prod {
if err := gj.saveToAllowList(
qc,
query,
ns); err != nil {
return res, err
}
}
return res, err
}
func (g *GraphJin) GraphQLByName(
c context.Context,
operation OpType,
name string,
vars json.RawMessage,
rc *ReqConfig) (*Result, error) {
gj := g.Load().(*graphjin)
ns := gj.namespace
if rc != nil && rc.Namespace.Set {
ns = rc.Namespace.Name
}
var op qcode.QType
switch operation {
case OpQuery:
op = qcode.QTQuery
case OpMutation:
op = qcode.QTMutation
default:
err := fmt.Errorf("invalid operation: %d", operation)
res := &Result{
ns: ns,
op: op,
name: name,
Errors: []Error{{Message: err.Error()}},
}
return res, err
}
_, res, err := gj.graphQL(c, op, ns, name, "", vars, rc)
return res, err
}
func (gj *graphjin) graphQL(
ctx context.Context,
op qcode.QType,
ns string,
name string,
query string,
vars json.RawMessage,
rc *ReqConfig) (*qcode.QCode, *Result, error) {
var err error
ctx1, span := gj.spanStart(ctx, "GraphJin Query")
defer span.End()
ct := &gcontext{
gj: gj,
rc: rc,
ns: ns,
op: op,
name: name,
}
res := &Result{
ns: ns,
op: op,
name: name,
}
if err != nil {
res.Errors = []Error{{Message: err.Error()}}
return nil, res, err
}
if ct.op == qcode.QTSubscription {
return nil, res, errors.New("use 'core.Subscribe' for subscriptions")
}
if ct.op == qcode.QTMutation && gj.schema.DBType() == "mysql" {
return nil, res, errors.New("mysql: mutations not supported")
}
var role string
if v, ok := ctx1.Value(UserRoleKey).(string); ok {
role = v
} else if ctx1.Value(UserIDKey) != nil {
role = "user"
} else {
role = "anon"
}
qr := queryReq{
ns: ct.ns,
op: ct.op,
name: ct.name,
query: []byte(query),
vars: vars,
}
qres, err := ct.execQuery(ctx1, qr, role)
if err != nil {
res.Errors = []Error{{Message: err.Error()}}
}
var qc *qcode.QCode
if qres.qc != nil {
qc = qres.qc.st.qc
res.sql = qres.qc.st.sql
if qc != nil {
res.cacheControl = qc.Cache.Header
}
}
res.Data = json.RawMessage(qres.data)
res.role = qres.role
res.Vars = vars
return qc, res, err
}
// Reload redoes database discover and reinitializes GraphJin.
func (g *GraphJin) Reload() error {
gj := g.Load().(*graphjin)
gjNew, err := newGraphJin(gj.conf, gj.db, nil)
if err == nil {
g.Store(gjNew)
}
return err
}
// IsProd return true for production mode or false for development mode
func (g *GraphJin) IsProd() bool {
gj := g.Load().(*graphjin)
return gj.prod
}
type Header struct {
Type OpType
Name string
}
// Operation function return the operation type and name from the query.
// It uses a very fast algorithm to extract the operation without having to parse the query.
func Operation(query string) (Header, error) {
if h, err := graph.FastParse(query); err == nil {
t := OpType(qcode.GetQType(h.Type))
return Header{t, h.Name}, nil
} else {
return Header{}, err
}
}
func errResult(ns string, op qcode.QType, name string, err error) *Result {
return &Result{
ns: ns,
op: op,
name: name,
Errors: []Error{{Message: err.Error()}},
}
}