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query.go
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query.go
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package dynamodb
import (
"context"
"errors"
"github.com/aws/aws-sdk-go/service/dynamodb"
)
func (h handlerImp) GetByID(ctx context.Context, input BaseModel, index DynamoTableOrIndexName, dbKeys DBPSKeyValues) (BaseModel, error) {
req, err := h.prepareGetReq(index, dbKeys)
if err != nil {
return nil, err
}
res, getErr := h.GetItemWithContext(ctx, req)
if getErr != nil {
return nil, getErr
}
if len(res.Item) < 1 {
return nil, nil
}
mdl, mErr := input.Unmarshal(res.Item)
return mdl, mErr
}
func (h handlerImp) GetByIDs(ctx context.Context, input BaseModel, dbKeys []DBPSKeyValues) ([]BaseModel, error) {
pages := Partition(len(dbKeys), 25)
ch := make(chan baseModelsWithErr, len(pages))
for page := range pages {
go func(page IdxRange) {
req := h.buildGetRequests(dbKeys[page.Low:page.High])
h.loadPage(ctx, input, req, ch)
}(page)
}
records := make([]BaseModel, 0, len(dbKeys))
for {
res, done := <-ch
if res.Err != nil {
return nil, res.Err
}
records = append(records, res.Records...)
if done {
break
}
}
return records, nil
}
func (h handlerImp) GetRecordsWithScanFilter(ctx context.Context, input BaseModel, filters *AwsExpressionWrapper) ([]BaseModel, DBAttributeValues, error) {
scanInput, err := filters.BuildScanInput()
if err != nil {
return nil, nil, err
}
res, getErr := h.ScanWithContext(ctx, scanInput)
if getErr != nil {
return nil, nil, getErr
}
items := make([]BaseModel, 0, len(res.Items))
for _, item := range res.Items {
mdl, mErr := input.Unmarshal(item)
if mErr != nil {
return nil, nil, mErr
}
items = append(items, mdl)
}
return items, res.LastEvaluatedKey, nil
}
func (h handlerImp) GetRecordsWithQueryFilter(ctx context.Context, input BaseModel, filters *AwsExpressionWrapper) ([]BaseModel, DBAttributeValues, error) {
query, err := filters.BuildQueryInput()
if err != nil {
return nil, nil, err
}
res, getErr := h.QueryWithContext(ctx, query)
if getErr != nil {
return nil, nil, getErr
}
items := make([]BaseModel, 0, len(res.Items))
for _, item := range res.Items {
mdl, mErr := input.Unmarshal(item)
if mErr != nil {
return nil, nil, mErr
}
items = append(items, mdl)
}
return items, res.LastEvaluatedKey, nil
}
func (h handlerImp) prepareGetReq(name DynamoTableOrIndexName, keys DBPSKeyValues) (*dynamodb.GetItemInput, error) {
if len(keys.GetPartitionKey()) < 1 {
return nil, errors.New("invalid partition key")
}
dbKeys := h.config.TableInfo.DBPSKeyNames
if keys, ok := h.config.Indexes[name]; ok {
dbKeys = keys
}
expr := NewExpressionWrapper(h.config.TableInfo.TableName).
WithPartitionKey(string(dbKeys.PartitionKey), string(keys.GetPartitionKey()))
if dbKeys.SortKey != nil && keys.GetSortKey() != nil {
expr.WithSortingKey(string(*dbKeys.SortKey), string(*keys.GetSortKey()))
}
return expr.BuildGetInput()
}
// buildGetRequests takes a list of ids and prepare list of BatchGetItemInput
func (h handlerImp) buildGetRequests(ids []DBPSKeyValues) *dynamodb.BatchGetItemInput {
tabInfo := h.config.TableInfo
dbKeys := tabInfo.DBPSKeyNames
// create and accumulate the attributes for the input
attributes := make([]map[string]*dynamodb.AttributeValue, 0)
for _, id := range ids {
expr := NewExpressionWrapper(h.config.TableInfo.TableName).
WithPartitionKey(string(dbKeys.PartitionKey), string(id.GetPartitionKey()))
if dbKeys.SortKey != nil && id.GetSortKey() != nil {
expr.WithSortingKey(string(*dbKeys.SortKey), string(*id.GetSortKey()))
}
attribute, err := expr.CreateQueryKeys()
if err != nil {
// ignore wrong Ids
continue
}
attributes = append(attributes, attribute)
}
// create and return the Batch get request
return &dynamodb.BatchGetItemInput{
RequestItems: map[string]*dynamodb.KeysAndAttributes{
tabInfo.TableName: {
Keys: attributes,
},
},
}
}
func (h handlerImp) loadPage(ctx context.Context, model BaseModel, req *dynamodb.BatchGetItemInput, ch chan baseModelsWithErr) {
records := make([]BaseModel, 0)
// deserialize received output
acc := func(res *dynamodb.BatchGetItemOutput) error {
for _, item := range res.Responses[h.config.TableInfo.TableName] {
mdl, err := model.Unmarshal(item)
if err != nil {
return err
}
records = append(records, mdl)
}
return nil
}
var load func(req *dynamodb.BatchGetItemInput) error
load = func(req *dynamodb.BatchGetItemInput) error {
var res *dynamodb.BatchGetItemOutput
var err error
if req != nil {
res, err = h.BatchGetItemWithContext(ctx, req)
if err != nil {
return err
}
}
if res != nil && len(res.Responses) > 0 {
if err := acc(res); err != nil {
return err
}
}
if len(res.UnprocessedKeys) > 0 {
return load(&dynamodb.BatchGetItemInput{
RequestItems: res.UnprocessedKeys,
})
}
return nil
}
err := load(req)
ch <- baseModelsWithErr{
Records: records,
Err: err,
}
}