github.com/deroproject/derosuite@v2.1.6-1.0.20200307070847-0f2e589c7a2b+incompatible/blockchain/rpcserver/getblockheaderbytopoheight.go (about)

     1  // Copyright 2017-2018 DERO Project. All rights reserved.
     2  // Use of this source code in any form is governed by RESEARCH license.
     3  // license can be found in the LICENSE file.
     4  // GPG: 0F39 E425 8C65 3947 702A  8234 08B2 0360 A03A 9DE8
     5  //
     6  //
     7  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
     8  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     9  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
    10  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    11  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    12  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    13  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    14  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    15  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    16  
    17  package rpcserver
    18  
    19  // get block template handler not implemented
    20  
    21  import "fmt"
    22  import "context"
    23  
    24  //import	"log"
    25  //import 	"net/http"
    26  
    27  import "github.com/intel-go/fastjson"
    28  import "github.com/osamingo/jsonrpc"
    29  
    30  //import "github.com/deroproject/derosuite/crypto"
    31  import "github.com/deroproject/derosuite/structures"
    32  
    33  type GetBlockHeaderByTopoHeight_Handler struct{}
    34  
    35  func (h GetBlockHeaderByTopoHeight_Handler) ServeJSONRPC(c context.Context, params *fastjson.RawMessage) (interface{}, *jsonrpc.Error) {
    36  	var p structures.GetBlockHeaderByTopoHeight_Params
    37  	if err := jsonrpc.Unmarshal(params, &p); err != nil {
    38  		return nil, err
    39  	}
    40  
    41  	if int64(p.TopoHeight) > chain.Load_TOPO_HEIGHT(nil) {
    42  		return nil, &jsonrpc.Error{Code: -2, Message: fmt.Sprintf("Too big topo height: %d, current blockchain height = %d", p.TopoHeight, chain.Load_TOPO_HEIGHT(nil))}
    43  	}
    44  
    45  	//return nil, &jsonrpc.Error{Code: -2, Message: fmt.Sprintf("NOT SUPPORTED height: %d, current blockchain height = %d", p.Height, chain.Get_Height())}
    46  	hash, err := chain.Load_Block_Topological_order_at_index(nil, int64(p.TopoHeight))
    47  	if err != nil { // if err return err
    48  		logger.Warnf("User requested %d height block, chain topo height %d but err occured %s", p.TopoHeight, chain.Load_TOPO_HEIGHT(nil), err)
    49  
    50  		return nil, jsonrpc.ErrInvalidParams()
    51  	}
    52  
    53  	block_header, err := chain.GetBlockHeader(hash)
    54  	if err != nil { // if err return err
    55  		logger.Warnf("User requested %d height block, chain  topo height %d but err occured %s", p.TopoHeight, chain.Load_TOPO_HEIGHT(nil), err)
    56  
    57  		return nil, jsonrpc.ErrInvalidParams()
    58  	}
    59  
    60  	return structures.GetBlockHeaderByHeight_Result{ // return success
    61  		Block_Header: block_header,
    62  		Status:       "OK",
    63  	}, nil
    64  
    65  }