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introspec.go
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introspec.go
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package core
import (
"fmt"
"strings"
"github.com/chirino/graphql"
"github.com/chirino/graphql/resolvers"
"github.com/chirino/graphql/schema"
"github.com/dosco/graphjin/core/internal/sdata"
"github.com/dosco/graphjin/core/internal/util"
)
var typeMap map[string]string = map[string]string{
"smallint": "Int",
"integer": "Int",
"bigint": "Int",
"smallserial": "Int",
"serial": "Int",
"bigserial": "Int",
"decimal": "Float",
"numeric": "Float",
"real": "Float",
"double precision": "Float",
"money": "Float",
"boolean": "Boolean",
}
type expInfo struct {
name, vtype string
list bool
desc, db string
}
const (
likeDesc = "Value matching pattern where '%' represents zero or more characters and '_' represents a single character. Eg. '_r%' finds values having 'r' in second position"
notLikeDesc = "Value not matching pattern where '%' represents zero or more characters and '_' represents a single character. Eg. '_r%' finds values not having 'r' in second position"
iLikeDesc = "Value matching (case-insensitive) pattern where '%' represents zero or more characters and '_' represents a single character. Eg. '_r%' finds values having 'r' in second position"
notILikeDesc = "Value not matching (case-insensitive) pattern where '%' represents zero or more characters and '_' represents a single character. Eg. '_r%' finds values not having 'r' in second position"
similarDesc = "Value matching regex pattern. Similar to the 'like' operator but with support for regex. Pattern must match entire value."
notSimilarDesc = "Value not matching regex pattern. Similar to the 'like' operator but with support for regex. Pattern must not match entire value."
)
var expList []expInfo = []expInfo{
{"eq", "", false, "Equals value", ""},
{"equals", "", false, "Equals value", ""},
{"neq", "", false, "Does not equal value", ""},
{"not_equals", "", false, "Does not equal value", ""},
{"gt", "", false, "Is greater than value", ""},
{"greater_than", "", false, "Is greater than value", ""},
{"lt", "", false, "Is lesser than value", ""},
{"lesser_than", "", false, "Is lesser than value", ""},
{"gte", "", false, "Is greater than or equals value", ""},
{"greater_or_equals", "", false, "Is greater than or equals value", ""},
{"lte", "", false, "Is lesser than or equals value", ""},
{"lesser_or_equals", "", false, "Is lesser than or equals value", ""},
{"in", "", true, "Is in list of values", ""},
{"nin", "", true, "Is not in list of values", ""},
{"not_in", "", true, "Is not in list of values", ""},
{"like", "String", false, likeDesc, ""},
{"nlike", "String", false, notLikeDesc, ""},
{"not_like", "String", false, notLikeDesc, ""},
{"ilike", "String", false, iLikeDesc, ""},
{"nilike", "String", false, notILikeDesc, ""},
{"not_ilike", "String", false, notILikeDesc, ""},
{"similar", "String", false, similarDesc, ""},
{"nsimilar", "String", false, notSimilarDesc, ""},
{"not_similar", "String", false, notSimilarDesc, ""},
{"regex", "String", false, "Value matches regex pattern", ""},
{"nregex", "String", false, "Value not matching regex pattern", ""},
{"not_regex", "String", false, "Value not matching regex pattern", ""},
{"iregex", "String", false, "Value matches (case-insensitive) regex pattern", ""},
{"niregex", "String", false, "Value not matching (case-insensitive) regex pattern", ""},
{"not_iregex", "String", false, "Value not matching (case-insensitive) regex pattern", ""},
{"has_key", "", false, "JSON value contains this key", ""},
{"has_key_any", "", true, "JSON value contains any of these keys", ""},
{"has_key_all", "", true, "JSON value contains all of these keys", ""},
{"contains", "", false, "JSON value matches any of they key/value pairs", ""},
{"contained_in", "", false, "JSON value contains all of they key/value pairs", ""},
{"is_null", "Boolean", false, "Is value null (true) or not null (false)", ""},
}
type funcInfo struct {
name, desc, db string
}
var funcCount = funcInfo{"count", "Count the number of rows", ""}
var funcListNum []funcInfo = []funcInfo{
{"avg", "Calculate an average %s", ""},
{"max", "Find the maximum %s", ""},
{"min", "Find the minimum %s", ""},
{"stddev", "Calculate the standard deviation of %s values", ""},
{"stddev_pop", "Calculate the population standard deviation of %s values", ""},
{"stddev_samp", "Calculate the sample standard deviation of %s values", ""},
{"variance", "Calculate the sample variance of %s values", ""},
{"var_samp", "Calculate the sample variance of %s values", ""},
{"var_pop", "Calculate the population sample variance of %s values", ""},
}
var funcListString []funcInfo = []funcInfo{
{"length", "Calculate the length of %s", ""},
{"lower", "Convert %s to lowercase", ""},
{"upper", "Convert %s to uppercase", ""},
}
type intro struct {
*schema.Schema
*sdata.DBSchema
gj *GraphJin
query *schema.Object
mutation *schema.Object
subscription *schema.Object
exptNeeded map[string]bool
}
func (gj *GraphJin) initGraphQLEgine() error {
if gj.prod {
return nil
}
engine := graphql.New()
in := &intro{
Schema: engine.Schema,
DBSchema: gj.schema,
gj: gj,
query: &schema.Object{Name: "Query", Fields: schema.FieldList{}},
mutation: &schema.Object{Name: "Mutation", Fields: schema.FieldList{}},
subscription: &schema.Object{Name: "Subscribe", Fields: schema.FieldList{}},
exptNeeded: map[string]bool{},
}
in.Types[in.query.Name] = in.query
in.Types[in.mutation.Name] = in.mutation
in.Types[in.subscription.Name] = in.subscription
in.EntryPoints[schema.Query] = in.query
in.EntryPoints[schema.Mutation] = in.mutation
in.EntryPoints[schema.Subscription] = in.subscription
in.Types["OrderDirection"] = &schema.Enum{Name: "OrderDirection", Values: []*schema.EnumValue{
{
Name: "asc",
Desc: schema.NewDescription("Ascending"),
}, {
Name: "desc",
Desc: schema.NewDescription("Descending"),
},
}}
in.Types["Cursor"] = &schema.Scalar{
Name: "Cursor",
Desc: schema.NewDescription("A cursor is an encoded string use for pagination"),
}
if err := in.addTables(); err != nil {
return err
}
in.addExpressions()
in.addDirectives()
if err := in.ResolveTypes(); err != nil {
return err
}
engine.Resolver = resolvers.Func(revolverFunc)
gj.ge = engine
return nil
}
func revolverFunc(request *resolvers.ResolveRequest, next resolvers.Resolution) resolvers.Resolution {
resolver := resolvers.MetadataResolver.Resolve(request, next)
if resolver != nil {
return resolver
}
resolver = resolvers.MethodResolver.Resolve(request, next) // needed by the MetadataResolver
if resolver != nil {
return resolver
}
return nil
}
func (in *intro) addTables() error {
for _, t := range in.GetTables() {
if err := in.addTable(t.Name, t, false); err != nil {
return err
}
if err := in.addTable(t.Name, t, true); err != nil {
return err
}
}
for name, t := range in.GetAliases() {
if err := in.addTable(name, t, false); err != nil {
return err
}
}
return nil
}
// func (in *intro) addToTable(name, desc string, ti sdata.DBTable) {
// k := name + "Output"
// var ot *schema.Object = in.Types[k].(*schema.Object)
// ot.Fields = append(ot.Fields, &schema.Field{
// Name: ti.Name,
// Type: &schema.TypeName{Name: ti.Name + "Output"},
// Desc: schema.NewDescription(desc),
// })
// }
func (in *intro) addTable(name string, ti sdata.DBTable, singular bool) error {
if ti.Blocked {
return nil
}
if len(ti.Columns) == 0 {
return nil
}
if singular {
name = name + in.SingularSuffix
}
if in.gj.conf.EnableCamelcase {
name = util.ToCamel(name)
}
// outputType
ot := &schema.Object{
Name: name + "Output", Fields: schema.FieldList{},
}
in.Types[ot.Name] = ot
// inputType
it := &schema.InputObject{
Name: name + "Input", Fields: schema.InputValueList{},
}
in.Types[it.Name] = it
// orderByType
obt := &schema.InputObject{
Name: name + "OrderBy", Fields: schema.InputValueList{},
}
in.Types[obt.Name] = obt
ot.Fields = append(ot.Fields, &schema.Field{
Name: name,
Type: &schema.NonNull{OfType: &schema.List{OfType: &schema.NonNull{OfType: &schema.TypeName{Name: name + "Output"}}}},
})
// expressionType
exptName := name + "Expression"
expt := &schema.InputObject{
Name: exptName,
Fields: schema.InputValueList{
&schema.InputValue{
Name: "and",
Type: &schema.TypeName{Name: exptName},
},
&schema.InputValue{
Name: "or",
Type: &schema.TypeName{Name: exptName},
},
&schema.InputValue{
Name: "not",
Type: &schema.TypeName{Name: exptName},
},
},
}
in.Types[expt.Name] = expt
for _, col := range ti.Columns {
in.addColumn(name, ti, col, it, obt, expt, ot, singular)
}
relTables1, err := in.GetFirstDegree(ti.Schema, ti.Name)
if err != nil {
return err
}
for k, t := range relTables1 {
if t.Blocked {
continue
}
ot.Fields = append(ot.Fields, &schema.Field{
Name: k,
Type: &schema.TypeName{Name: t.Name + "Output"},
})
}
relTables2, err := in.GetSecondDegree(ti.Schema, ti.Name)
if err != nil {
return err
}
for k, t := range relTables2 {
if t.Blocked {
continue
}
ot.Fields = append(ot.Fields, &schema.Field{
Name: k,
Type: &schema.TypeName{Name: t.Name + "Output"},
})
}
return nil
}
func (in *intro) addDirectives() {
in.DeclaredDirectives["object"] = &schema.DirectiveDecl{
Name: "object",
Desc: schema.NewDescription("Directs the executor to change the return type from a list to a object. All but the first entry of the list will be truncated"),
Locs: []string{"FIELD"},
}
in.DeclaredDirectives["through"] = &schema.DirectiveDecl{
Name: "through",
Desc: schema.NewDescription("Directs the executor to use the specified table as a join-table to connect this field and it's parent"),
Locs: []string{"FIELD"},
Args: schema.InputValueList{
{
Name: "table",
Desc: schema.NewDescription("Table name"),
Type: &schema.TypeName{Name: "String"},
},
},
}
in.DeclaredDirectives["script"] = &schema.DirectiveDecl{
Name: "script",
Desc: schema.NewDescription("Script the executor to use run specified script against this GraphQL request"),
Locs: []string{"QUERY", "MUTATION", "SUBSCRIPTION"},
Args: schema.InputValueList{
{
Name: "name",
Desc: schema.NewDescription("Script name"),
Type: &schema.TypeName{Name: "String"},
},
},
}
in.DeclaredDirectives["notRelated"] = &schema.DirectiveDecl{
Name: "notRelated",
Desc: schema.NewDescription("Directs the executor to treat this selector as if it were the top-level selector with no relation to its parent"),
Locs: []string{"FIELD"},
}
in.DeclaredDirectives["cacheControl"] = &schema.DirectiveDecl{
Name: "cacheControl",
Desc: schema.NewDescription("Directs the executor to set the cache-control header when GET (APQ) requests are used for the query"),
Locs: []string{"QUERY", "MUTATION", "SUBSCRIPTION"},
Args: schema.InputValueList{
{
Name: "maxAge",
Desc: schema.NewDescription("The maximum amount of time (in seconds) a resource is considered fresh"),
Type: &schema.TypeName{Name: "Int"},
},
{
Name: "scope",
Desc: schema.NewDescription("Set to 'public' when any cache can store the data and 'private' when only the browser cache should"),
Type: &schema.TypeName{Name: "String"},
},
},
}
}
func (in *intro) addColumn(
tableName string,
ti sdata.DBTable, col sdata.DBColumn,
it, obt, expt *schema.InputObject, ot *schema.Object, singular bool) {
colName := col.Name
if col.Blocked {
return
}
if in.gj.conf.EnableCamelcase {
colName = util.ToCamel(colName)
}
colType, typeName := getGQLType(col)
ot.Fields = append(ot.Fields, &schema.Field{
Name: colName,
Type: colType,
})
in.addFuncs(colName, typeName, colType, ti, col, it, obt, expt, ot, singular)
in.addArgs(tableName, ti, col, it, obt, expt, ot, singular)
it.Fields = append(it.Fields, &schema.InputValue{
Name: colName,
Type: colType,
})
obt.Fields = append(obt.Fields, &schema.InputValue{
Name: colName,
Type: &schema.TypeName{Name: "OrderDirection"},
})
in.exptNeeded[typeName] = true
expt.Fields = append(expt.Fields, &schema.InputValue{
Name: colName,
Type: &schema.TypeName{Name: typeName + "Expression"},
})
}
func (in *intro) addFuncs(
colName string,
typeName string,
colType schema.Type,
ti sdata.DBTable, col sdata.DBColumn,
it, obt, expt *schema.InputObject, ot *schema.Object, singular bool) {
var fn string
if in.gj.conf.DisableFuncs {
return
}
if col.PrimaryKey && !in.gj.conf.DisableAgg {
fn = funcCount.name + "_" + colName
if in.gj.conf.EnableCamelcase {
fn = util.ToCamel(fn)
}
ot.Fields = append(ot.Fields, &schema.Field{
Name: fn,
Type: colType,
Desc: schema.NewDescription(funcCount.desc),
})
}
// No functions on foreign key columns
if col.FKeyCol == "" {
// If it's a numeric type...
if !in.gj.conf.DisableAgg {
if typeName == "Float" || typeName == "Int" {
for _, v := range funcListNum {
fn = funcCount.name + "_" + colName
if in.gj.conf.EnableCamelcase {
fn = util.ToCamel(fn)
}
desc := fmt.Sprintf(v.desc, colName)
ot.Fields = append(ot.Fields, &schema.Field{
Name: fn,
Type: colType,
Desc: schema.NewDescription(desc),
})
}
}
}
if typeName == "String" {
for _, v := range funcListString {
fn = funcCount.name + "_" + colName
if in.gj.conf.EnableCamelcase {
fn = util.ToCamel(fn)
}
desc := fmt.Sprintf(v.desc, colName)
ot.Fields = append(ot.Fields, &schema.Field{
Name: fn,
Type: colType,
Desc: schema.NewDescription(desc),
})
}
}
for _, f := range in.GetFunctions() {
if col.Type != f.Params[0].Type {
continue
}
fn = funcCount.name + "_" + colName
if in.gj.conf.EnableCamelcase {
fn = util.ToCamel(fn)
}
ot.Fields = append(ot.Fields, &schema.Field{
Name: fn,
Type: colType,
})
}
}
}
func (in *intro) addArgs(
name string,
ti sdata.DBTable, col sdata.DBColumn,
it, obt, expt *schema.InputObject, ot *schema.Object, singular bool) {
otName := &schema.TypeName{Name: ot.Name}
itName := &schema.TypeName{Name: it.Name}
potName := &schema.List{OfType: &schema.NonNull{OfType: &schema.TypeName{Name: ot.Name}}}
pitName := &schema.List{OfType: &schema.NonNull{OfType: &schema.TypeName{Name: it.Name}}}
var args schema.InputValueList
if !singular {
args = schema.InputValueList{
&schema.InputValue{
Desc: schema.NewDescription("Sort or order results. Use key 'asc' for ascending and 'desc' for descending"),
Name: "order_by",
Type: &schema.TypeName{Name: obt.Name},
},
&schema.InputValue{
Desc: schema.NewDescription("Filter results based on column values or values of columns in related tables"),
Name: "where",
Type: &schema.TypeName{Name: expt.Name},
},
&schema.InputValue{
Desc: schema.NewDescription("Limit the number of returned rows"),
Name: "limit",
Type: &schema.TypeName{Name: "Int"},
},
&schema.InputValue{
Desc: schema.NewDescription("Offset the number of returned rows (Not efficient for pagination, please use a cursor for that)"),
Name: "offset",
Type: &schema.TypeName{Name: "Int"},
},
&schema.InputValue{
Desc: schema.NewDescription("Number of rows to return from the top. Combine with 'after' or 'before' arguments for cursor pagination"),
Name: "first",
Type: &schema.TypeName{Name: "Int"},
},
&schema.InputValue{
Desc: schema.NewDescription("Number of rows to return from the bottom. Combine with 'after' or 'before' arguments for cursor pagination"),
Name: "last",
Type: &schema.TypeName{Name: "Int"},
},
&schema.InputValue{
Desc: schema.NewDescription("Pass the cursor to this argument for backward pagination"),
Name: "before",
Type: &schema.TypeName{Name: "Cursor"},
},
&schema.InputValue{
Desc: schema.NewDescription("Pass the cursor to this argument for forward pagination"),
Name: "after",
Type: &schema.TypeName{Name: "Cursor"},
},
}
if len(ti.FullText) == 0 {
args = append(args, &schema.InputValue{
Desc: schema.NewDescription("Performs a full text search"),
Name: "search",
Type: &schema.TypeName{Name: "String"},
})
}
}
if ti.PrimaryCol.Name != "" && singular {
colType, _ := getGQLType(ti.PrimaryCol)
args = append(args, &schema.InputValue{
Desc: schema.NewDescription("Finds the record by the primary key"),
Name: "id",
Type: colType,
})
}
if singular {
in.query.Fields = append(in.query.Fields, &schema.Field{
//Desc: schema.NewDescription(""),
Name: name,
Type: otName,
Args: args,
})
in.subscription.Fields = append(in.subscription.Fields, &schema.Field{
//Desc: schema.NewDescription(""),
Name: name,
Type: otName,
Args: args,
})
} else {
in.query.Fields = append(in.query.Fields, &schema.Field{
//Desc: schema.NewDescription(""),
Name: name,
Type: potName,
Args: args,
})
in.subscription.Fields = append(in.subscription.Fields, &schema.Field{
//Desc: schema.NewDescription(""),
Name: name,
Type: potName,
Args: args,
})
}
mutationArgs := append(args, schema.InputValueList{
&schema.InputValue{
Desc: schema.NewDescription(fmt.Sprintf("Insert row into table %s", name)),
Name: "insert",
Type: pitName,
},
&schema.InputValue{
Desc: schema.NewDescription(fmt.Sprintf("Update row in table %s", name)),
Name: "update",
Type: itName,
},
&schema.InputValue{
Desc: schema.NewDescription(fmt.Sprintf("Update or Insert row in table %s", name)),
Name: "upsert",
Type: itName,
},
&schema.InputValue{
Desc: schema.NewDescription(fmt.Sprintf("Delete row from table %s", name)),
Name: "delete",
Type: &schema.NonNull{OfType: &schema.TypeName{Name: "Boolean"}},
},
}...)
in.mutation.Fields = append(in.mutation.Fields, &schema.Field{
Name: name,
Args: mutationArgs,
Type: potName,
})
}
func (in *intro) addExpressions() {
// scalarExpressionTypesNeeded
for typeName := range in.exptNeeded {
var fields schema.InputValueList
for _, v := range expList {
vtype := v.vtype
if v.vtype == "" {
vtype = typeName
}
iv := &schema.InputValue{
Name: v.name,
Desc: schema.NewDescription(v.desc),
Type: &schema.TypeName{Name: vtype},
}
if v.list {
iv.Type = &schema.List{OfType: iv.Type}
}
fields = append(fields, iv)
}
ext := &schema.InputObject{
Name: typeName + "Expression",
Fields: fields,
}
in.Types[ext.Name] = ext
}
}
func getGQLType(col sdata.DBColumn) (schema.Type, string) {
var typeName string
var ok bool
k := strings.ToLower(col.Type)
if i := strings.IndexAny(k, "(["); i != -1 {
k = k[:i]
}
if col.PrimaryKey {
typeName = "ID"
} else if typeName, ok = typeMap[k]; !ok {
typeName = "String"
}
var t schema.Type = &schema.TypeName{Name: typeName}
if col.Array {
t = &schema.List{OfType: t}
}
// if col.NotNull {
// t = &schema.NonNull{OfType: t}
// }
return t, typeName
}