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sql.go
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sql.go
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package sql
import (
"bytes"
"fmt"
"regexp"
"strconv"
"text/template"
"github.com/c-jamie/sql-manager/clientlib/log"
sqlMig "github.com/c-jamie/sql-manager/clientlib/migration"
"github.com/c-jamie/sql-manager/clientlib/utils"
)
// SQLStack represents the domain of a parsed SQL script, including any nested SQL referenced
type SQLStack struct {
SQL string
Directives *SQLDirectives
Nested bool
Level int
SQuery *NestedSQLQuery
}
type getter func(table string) (string, error)
// SQLMngr represents the domain of a SQL scripts combined with any migrations for that table
type SQLMngr struct {
Raw string
Parsed string
Directives *SQLDirectives
DirectiveKeyOverrides map[string]string
Err error
Env string
Migrations map[string][]*sqlMig.SQLMigrationStrategy
Stack []*SQLStack
StackDepth int
Root map[string]string
Getter getter
}
// New Returns a new SQLMngr
func New(script string, env string, migrations map[string][]*sqlMig.SQLMigrationStrategy, get getter) SQLMngr {
var sql SQLMngr
sql.Raw = script
sql.Env = env
sql.StackDepth = -1
sql.Migrations = migrations
sql.Getter = get
return sql
}
// stackPush adds any nested SQL to the stack
func (sql *SQLMngr) stackPush(dir *SQLDirectives, sqlScript string, level int, query *NestedSQLQuery) {
sql.Stack = append(sql.Stack, &SQLStack{SQL: sqlScript, Directives: dir, SQuery: query, Level: level})
sql.StackDepth += 1
}
// stackPop returns the last nested SQL in the stack
func (sql *SQLMngr) stackPop() *SQLStack {
sql.StackDepth -= 1
return sql.Stack[sql.StackDepth+1]
}
// parseRawDirectives grabs the SQLDirectives for a given SQL
func (sql *SQLMngr) parseRawDirectives() {
sql.Directives, sql.Err = Parse(sql.Raw)
}
// getScript returns the referenced SQL Script
func (sql *SQLMngr) getScript(file string, key string, name string) string {
if file != "" {
return sql.fileLoader(file)
} else {
return sql.serverLoader(name)
}
}
// fileLoader loads a file from disk
func (sql *SQLMngr) fileLoader(location string) string {
sqlScript, err := utils.ReadFile(location)
if err != nil {
return ""
} else {
return string(sqlScript)
}
}
// serverLoader loads a file from the SQL manager server
func (sql *SQLMngr) serverLoader(name string) string {
sqlScript, err := sql.Getter(name)
if err != nil {
return ""
} else {
return string(sqlScript)
}
}
// parseDirectives gets the nested SQL and any keywords from the SQLDirectives based on the Env
func (sql *SQLMngr) parseDirectives(dir *SQLDirectives) ([]*NestedSQLQuery, map[string]string) {
if sql.Env == "int" {
return dir.Int.NestedSQL, dir.Int.Keywords
} else if sql.Env == "prod" {
return dir.Prod.NestedSQL, dir.Prod.Keywords
} else if sql.Env == "dev" {
return dir.Dev.NestedSQL, dir.Dev.Keywords
} else if sql.Env == "local" {
return dir.Local.NestedSQL, dir.Local.Keywords
} else {
panic("bad env declared")
}
}
// compileFragments parses all nested SQL in the stack
func (sql *SQLMngr) compileFragments(sqlScript string, nestLevel int, dirUp bool, query *NestedSQLQuery) {
if sql.StackDepth > 100 {
panic("recursion error compiling SQL, depth exceeded")
}
var nSQL []*NestedSQLQuery
var sqlIn string
var err error
var dir *SQLDirectives
dir, err = Parse(sqlScript)
if err != nil {
panic(err)
}
sql.stackPush(dir, sqlScript, nestLevel, query)
nSQL, _ = sql.parseDirectives(dir)
for _, j := range nSQL {
log.Debug("nest level ", nestLevel)
sqlIn = sql.getScript(j.File, j.Key, j.Name)
sql.compileFragments(sqlIn, nestLevel+1, false, j)
}
}
// mergeFragments combines the SQL stack together
func (sql *SQLMngr) mergeFragments() {
context := make([]map[string]string, len(sql.Stack))
for i := 0; i < len(sql.Stack); i++ {
log.Debug("merge ", i)
stk := sql.stackPop()
nestedSQL, keywords := sql.parseDirectives(stk.Directives)
t := template.Must(template.New("sql").Parse(stk.SQL))
var out bytes.Buffer
insert := make(map[string]string)
if stk.Level != 0 {
if nestedSQL == nil {
t.Execute(&out, keywords)
insert[stk.SQuery.Key] = out.String()
context[stk.Level] = insert
} else {
t := template.Must(template.New("sql").Parse(stk.SQL))
log.Debug("stk.level", stk.Level)
for k, v := range context[stk.Level+1] {
keywords[k] = v
}
t.Execute(&out, keywords)
insert[stk.SQuery.Key] = out.String()
context[stk.Level] = insert
}
}
}
if len(sql.Stack) > 1 {
sql.Root = context[1]
}
}
// finalise generates the final SQL script
func (sql *SQLMngr) finalise() {
reg, err := regexp.Compile("[^a-zA-Z0-9]+")
if err != nil {
fmt.Println("error", err)
}
var keywords map[string]string
if len(sql.Stack) > 1 {
keywords = sql.Root
} else {
keywords = make(map[string]string)
}
log.Debug(sql.Root)
t := template.Must(template.New("sql").Parse(sql.Raw))
var out bytes.Buffer
_, topKey := sql.parseDirectives(sql.Directives)
log.Debug(sql.Directives.Dev.Keywords, sql.Env)
for k, v := range topKey {
keywords[k] = v
}
for k, v := range sql.DirectiveKeyOverrides {
keywords[k] = v
}
if sql.Migrations[sql.Env] != nil {
for _, v := range sql.Migrations[sql.Env] {
for _, j := range v.MigrationsUp {
table := reg.ReplaceAllString(j.SourceTable, "_") + "_" + strconv.Itoa(j.FileOrder)
keywords[table] = "true"
}
}
}
t.Execute(&out, keywords)
sql.Parsed = out.String()
}
// Compile returns the parsed SQL
func (sql *SQLMngr) Compile() string {
sql.parseRawDirectives()
sql.compileFragments(sql.Raw, 0, false, nil)
sql.mergeFragments()
sql.finalise()
return sql.Parsed
}