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mappings.go
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/
mappings.go
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package persistence
import (
"context"
"errors"
"fmt"
"regexp"
"strings"
"github.com/b2wdigital/restQL-golang/v4/internal/domain"
"github.com/b2wdigital/restQL-golang/v4/pkg/restql"
)
var envMappingRegex = regexp.MustCompile("^RESTQL_MAPPING_([^_]+)$")
var envMappingWithTenantRegex = regexp.MustCompile("^RESTQL_MAPPING_(\\w+)_(\\w+)$")
// MappingsReader fetch indexed mappings from database,
// configuration file and environment variable.
type MappingsReader struct {
log restql.Logger
env map[string]restql.Mapping
envWithTenant map[string]map[string]restql.Mapping
local map[string]restql.Mapping
localByTenant map[string]map[string]restql.Mapping
db Database
}
// NewMappingReader constructs a MappingsReader instance.
func NewMappingReader(log restql.Logger, env domain.EnvSource, local map[string]string, localByTenant map[string]map[string]string, db Database) MappingsReader {
envMappings := getMappingsFromEnv(log, env)
envWithTenantMappings := getMappingsFromEnvWithTenant(log, env)
localMappings := parseMappingsFromLocal(log, local)
localMappingsByTenant := make(map[string]map[string]restql.Mapping)
for t, m := range localByTenant {
localMappingsByTenant[t] = parseMappingsFromLocal(log, m)
}
return MappingsReader{log: log, env: envMappings, envWithTenant: envWithTenantMappings, local: localMappings, localByTenant: localMappingsByTenant, db: db}
}
// ListTenants fetch all tenants under which mappings are organized
func (mr MappingsReader) ListTenants(ctx context.Context) ([]string, error) {
tenantSet := make(map[string]struct{})
for tenant := range mr.localByTenant {
tenantSet[tenant] = struct{}{}
}
dbTenants, err := mr.db.FindAllTenants(ctx)
if err != nil {
log := restql.GetLogger(ctx)
log.Error("fail to read tenants from database", err)
} else {
for _, tenant := range dbTenants {
tenantSet[tenant] = struct{}{}
}
}
for tenant := range mr.envWithTenant {
tenantSet[tenant] = struct{}{}
}
tenants := make([]string, len(tenantSet))
i := 0
for tenant := range tenantSet {
tenants[i] = tenant
i++
}
return tenants, nil
}
// FromTenant fetch the mappings for the given tenant.
func (mr MappingsReader) FromTenant(ctx context.Context, tenant string) (map[string]restql.Mapping, error) {
log := restql.GetLogger(ctx)
log.Debug("fetching mappings")
errMappingsFound := fmt.Errorf("%w: tenant %s", restql.ErrMappingsNotFound, tenant)
result := make(map[string]restql.Mapping)
for k, v := range mr.local {
result[k] = v
}
localTenantMappings, found := mr.localByTenant[tenant]
if found {
for k, v := range localTenantMappings {
result[k] = v
}
}
dbMappings, err := mr.db.FindMappingsForTenant(ctx, tenant)
switch {
case err == errNoDatabase || errors.Is(err, restql.ErrMappingsNotFoundInDatabase):
result = mr.applyEnvMappings(result, tenant)
if len(result) == 0 {
return nil, errMappingsFound
}
log.Debug("tenant mappings", "value", result)
return result, nil
case err != nil:
log.Error("unknown database error when fetching mappings", err, "tenant", tenant)
return nil, err
}
for _, mapping := range dbMappings {
mapping.Source = restql.DatabaseSource
result[mapping.ResourceName()] = mapping
}
result = mr.applyEnvMappings(result, tenant)
if len(result) == 0 {
return nil, errMappingsFound
}
log.Debug("tenant mappings", "value", result)
return result, nil
}
func (mr MappingsReader) applyEnvMappings(result map[string]restql.Mapping, tenant string) map[string]restql.Mapping {
for k, v := range mr.env {
result[k] = v
}
tenantMappings, found := mr.envWithTenant[tenant]
if found {
for k, v := range tenantMappings {
result[k] = v
}
}
return result
}
// ErrSetResourceMappingNotAllowed is returned when trying to write a resource mapping on a resource stored on local or env.
var ErrSetResourceMappingNotAllowed = errors.New("a resource mapping must have a source of type database in order to provide writing operations")
// MappingsWriter is the entity that maps resource name to URL.
type MappingsWriter struct {
log restql.Logger
db Database
env map[string]restql.Mapping
envWithTenant map[string]map[string]restql.Mapping
local map[string]restql.Mapping
localByTenant map[string]map[string]restql.Mapping
}
// NewMappingWriter creates an instance of MappingsWriter
func NewMappingWriter(log restql.Logger, env domain.EnvSource, local map[string]string, localByTenant map[string]map[string]string, db Database) MappingsWriter {
envMappings := getMappingsFromEnv(log, env)
envWithTenantMappings := getMappingsFromEnvWithTenant(log, env)
localMappings := parseMappingsFromLocal(log, local)
localMappingsByTenant := make(map[string]map[string]restql.Mapping)
for t, m := range localByTenant {
localMappingsByTenant[t] = parseMappingsFromLocal(log, m)
}
return MappingsWriter{log: log, env: envMappings, envWithTenant: envWithTenantMappings, local: localMappings, localByTenant: localMappingsByTenant, db: db}
}
// Write sets a URL to a resource name under the given tenant
func (mw *MappingsWriter) Write(ctx context.Context, tenant string, resource string, url string) error {
if !mw.allowWrite(tenant, resource) {
log := restql.GetLogger(ctx)
log.Error("write operation on resource mapping not allowed", ErrSetResourceMappingNotAllowed, "tenant", tenant, "resource", resource)
return ErrSetResourceMappingNotAllowed
}
return mw.db.SetMapping(ctx, tenant, resource, url)
}
func (mw *MappingsWriter) allowWrite(tenant string, resourceName string) bool {
for resource := range mw.local {
if resource == resourceName {
return false
}
}
for resource := range mw.env {
if resource == resourceName {
return false
}
}
localTenantMappings, found := mw.localByTenant[tenant]
if found {
for resource := range localTenantMappings {
if resource == resourceName {
return false
}
}
}
envTenantMappings, found := mw.envWithTenant[tenant]
if found {
for resource := range envTenantMappings {
if resource == resourceName {
return false
}
}
}
return true
}
func getMappingsFromEnv(log restql.Logger, envSource domain.EnvSource) map[string]restql.Mapping {
result := make(map[string]restql.Mapping)
env := envSource.GetAll()
for key, value := range env {
matches := envMappingRegex.FindAllStringSubmatch(key, -1)
if len(matches) > 0 && len(matches[0]) >= 2 {
resource := strings.ToLower(matches[0][1])
mapping, err := restql.NewMapping(resource, value)
if err != nil {
log.Error("failed to create mapping", err)
continue
}
mapping.Source = restql.EnvSource
result[resource] = mapping
}
}
return result
}
func getMappingsFromEnvWithTenant(log restql.Logger, envSource domain.EnvSource) map[string]map[string]restql.Mapping {
result := make(map[string]map[string]restql.Mapping)
env := envSource.GetAll()
for key, value := range env {
matches := envMappingWithTenantRegex.FindAllStringSubmatch(key, -1)
if len(matches) > 0 && len(matches[0]) >= 3 {
tenant := strings.ToLower(matches[0][1])
resource := strings.ToLower(matches[0][2])
mapping, err := restql.NewMapping(resource, value)
if err != nil {
log.Error("failed to create mapping", err)
continue
}
tenantMappings, found := result[tenant]
if !found {
result[tenant] = map[string]restql.Mapping{
resource: mapping,
}
continue
}
mapping.Source = restql.EnvSource
tenantMappings[resource] = mapping
}
}
return result
}
func parseMappingsFromLocal(log restql.Logger, local map[string]string) map[string]restql.Mapping {
result := make(map[string]restql.Mapping)
for k, v := range local {
mapping, err := restql.NewMapping(k, v)
if err != nil {
log.Error("failed to create mapping", err)
continue
}
mapping.Source = restql.ConfigFileSource
result[k] = mapping
}
return result
}