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package dynamodb |
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import ( |
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"context" |
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SDK "github.com/aws/aws-sdk-go-v2/service/dynamodb" |
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"github.com/evalphobia/aws-sdk-go-v2-wrapper/errors" |
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"github.com/evalphobia/aws-sdk-go-v2-wrapper/private/pointers" |
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) |
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// Scan executes `Scan` operation. |
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func (svc *DynamoDB) Scan(ctx context.Context, r ScanRequest) (*ScanResult, error) { |
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in, err := r.ToInput() |
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if err != nil { |
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return nil, err |
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} |
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out, err := svc.RawScan(ctx, in) |
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if err == nil { |
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return NewScanResult(out), nil |
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} |
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err = svc.errWrap(errors.ErrorData{ |
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Err: err, |
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AWSOperation: "Scan", |
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}) |
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svc.Errorf(err.Error()) |
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return nil, err |
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} |
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// ScanRequest has parameters for `Scan` operation. |
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type ScanRequest struct { |
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TableName string |
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// optional |
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ConsistentRead bool |
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ExclusiveStartKey map[string]AttributeValue |
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ExpressionAttributeNames map[string]string |
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ExpressionAttributeValues map[string]AttributeValue |
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FilterExpression string |
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IndexName string |
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Limit int64 |
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ProjectionExpression string |
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ReturnConsumedCapacity ReturnConsumedCapacity |
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Segment int64 |
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Select Select |
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TotalSegments int64 |
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XConditions XConditions |
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} |
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func (r ScanRequest) ToInput() (*SDK.ScanInput, error) { |
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in := &SDK.ScanInput{} |
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if r.TableName != "" { |
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in.TableName = pointers.String(r.TableName) |
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} |
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if r.ConsistentRead { |
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in.ConsistentRead = pointers.Bool(r.ConsistentRead) |
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} |
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if len(r.ExclusiveStartKey) != 0 { |
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m := make(map[string]SDK.AttributeValue, len(r.ExclusiveStartKey)) |
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for key, val := range r.ExclusiveStartKey { |
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m[key] = val.ToSDK() |
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} |
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in.ExclusiveStartKey = m |
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} |
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in.ExpressionAttributeNames = r.ExpressionAttributeNames |
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if len(r.ExpressionAttributeValues) != 0 { |
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m := make(map[string]SDK.AttributeValue, len(r.ExpressionAttributeValues)) |
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for key, val := range r.ExpressionAttributeValues { |
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m[key] = val.ToSDK() |
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} |
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in.ExpressionAttributeValues = m |
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} |
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if r.FilterExpression != "" { |
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in.FilterExpression = pointers.String(r.FilterExpression) |
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} |
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if r.IndexName != "" { |
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in.IndexName = pointers.String(r.IndexName) |
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} |
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if r.Limit != 0 { |
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in.Limit = pointers.Long64(r.Limit) |
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} |
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if r.ProjectionExpression != "" { |
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in.ProjectionExpression = pointers.String(r.ProjectionExpression) |
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} |
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in.ReturnConsumedCapacity = SDK.ReturnConsumedCapacity(r.ReturnConsumedCapacity) |
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in.Select = SDK.Select(r.Select) |
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if r.XConditions.hasValue() { |
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expr, err := r.XConditions.Build() |
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if err != nil { |
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return nil, err |
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} |
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in.ExpressionAttributeNames = expr.Names() |
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in.ExpressionAttributeValues = expr.Values() |
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in.FilterExpression = expr.Filter() |
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in.ProjectionExpression = expr.Projection() |
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} |
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return in, nil |
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} |
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113
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// ScanResult contains results from `Scan` operation. |
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type ScanResult struct { |
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ConsumedCapacity ConsumedCapacity |
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Count int64 |
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Items []map[string]SDK.AttributeValue // keep original type to reduce unmarshal cost |
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LastEvaluatedKey map[string]AttributeValue |
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ScannedCount int64 |
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} |
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func NewScanResult(output *SDK.ScanResponse) *ScanResult { |
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r := &ScanResult{} |
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if output == nil { |
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return r |
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} |
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128
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if output.ConsumedCapacity != nil { |
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r.ConsumedCapacity = newConsumedCapacity(*output.ConsumedCapacity) |
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} |
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132
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if output.Count != nil { |
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r.Count = *output.Count |
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} |
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136
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r.Items = output.Items |
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r.LastEvaluatedKey = newAttributeValueMap(output.LastEvaluatedKey) |
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139
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if output.ScannedCount != nil { |
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r.ScannedCount = *output.ScannedCount |
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} |
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return r |
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} |
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144
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145
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func (r ScanResult) ToSliceMap() ([]map[string]interface{}, error) { |
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146
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return ToSliceMapValues(r.Items), nil |
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} |
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149
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func (r ScanResult) Unmarshal(out interface{}) error { |
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150
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return RawUnmarshalAttributeValues(r.Items, out) |
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151
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} |
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152
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evalphobia /
aws-sdk-go-v2-wrapper
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