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107 lines
3.6 KiB
107 lines
3.6 KiB
from kivy.app import App
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from kivy.factory import Factory
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from kivy.properties import ObjectProperty
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from kivy.lang import Builder
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from electrum.i18n import _
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Builder.load_string('''
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#:import _ electrum_gui.kivy.i18n._
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<CheckpointDialog@Popup>
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id: popup
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title: _('Blockchain')
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size_hint: 1, 1
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cp_height: 0
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cp_value: ''
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BoxLayout:
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orientation: 'vertical'
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padding: '10dp'
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spacing: '10dp'
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TopLabel:
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height: '48dp'
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id: bc_height
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text: _("Verified headers: %d blocks.")% app.num_blocks
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TopLabel:
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height: '48dp'
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id: bc_status
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text: _("Connected to %d nodes.")% app.num_nodes if app.num_nodes else _("Not connected?")
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Widget:
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size_hint: 1, 0.1
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TopLabel:
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text: _("In order to verify the history returned by your main server, Electrum downloads block headers from random nodes. These headers are then used to check that transactions sent by the server really are in the blockchain.")
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font_size: '6pt'
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Widget:
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size_hint: 1, 0.1
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GridLayout:
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orientation: 'horizontal'
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cols: 2
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height: '36dp'
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TopLabel:
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text: _('Checkpoint') + ':'
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height: '36dp'
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TextInput:
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id: height_input
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multiline: False
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input_type: 'number'
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height: '36dp'
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size_hint_y: None
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text: '%d'%root.cp_height
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on_focus: root.on_height_str()
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TopLabel:
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text: _('Block hash') + ':'
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TxHashLabel:
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data: root.cp_value
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Widget:
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size_hint: 1, 0.1
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Label:
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font_size: '6pt'
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text: _('If there is a fork of the blockchain, you need to configure your checkpoint in order to make sure that you are on the correct side of the fork. Enter a block number to fetch a checkpoint from your main server, and check its value from independent sources.')
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halign: 'left'
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text_size: self.width, None
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size: self.texture_size
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Widget:
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size_hint: 1, 0.3
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BoxLayout:
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orientation: 'horizontal'
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size_hint: 1, 0.2
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Button:
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text: _('Cancel')
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size_hint: 0.5, None
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height: '48dp'
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on_release: popup.dismiss()
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Button:
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text: _('OK')
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size_hint: 0.5, None
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height: '48dp'
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on_release:
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root.callback(root.cp_height, root.cp_value)
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popup.dismiss()
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''')
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class CheckpointDialog(Factory.Popup):
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def __init__(self, network, callback):
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Factory.Popup.__init__(self)
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self.network = network
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self.cp_height, self.cp_value = self.network.blockchain.get_checkpoint()
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self.callback = callback
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def on_height_str(self):
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try:
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new_height = int(self.ids.height_input.text)
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except:
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new_height = self.cp_height
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self.ids.height_input.text = '%d'%new_height
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if new_height == self.cp_height:
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return
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try:
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header = self.network.synchronous_get(('blockchain.block.get_header', [new_height]), 5)
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new_value = self.network.blockchain.hash_header(header)
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except BaseException as e:
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self.network.print_error(str(e))
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new_value = ''
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if new_value:
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self.cp_height = new_height
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self.cp_value = new_value
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