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62 lines
3.1 KiB
Go
62 lines
3.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package geth contains the simplified mobile APIs to go-ethereum.
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//
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// The scope of this package is *not* to allow writing a custom Ethereum client
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// with pieces plucked from go-ethereum, rather to allow writing native dapps on
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// mobile platforms. Keep this in mind when using or extending this package!
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//
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// API limitations
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//
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// Since gomobile cannot bridge arbitrary types between Go and Android/iOS, the
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// exposed APIs need to be manually wrapped into simplified types, with custom
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// constructors and getters/setters to ensure that they can be meaningfully used
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// from Java/ObjC too.
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//
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// With this in mind, please try to limit the scope of this package and only add
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// essentials without which mobile support cannot work, especially since manually
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// syncing the code will be unwieldy otherwise. In the long term we might consider
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// writing custom library generators, but those are out of scope now.
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//
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// Content wise each file in this package corresponds to an entire Go package
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// from the go-ethereum repository. Please adhere to this scoping to prevent this
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// package getting unmaintainable.
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//
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// Wrapping guidelines:
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//
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// Every type that is to be exposed should be wrapped into its own plain struct,
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// which internally contains a single field: the original go-ethereum version.
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// This is needed because gomobile cannot expose named types for now.
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//
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// Whenever a method argument or a return type is a custom struct, the pointer
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// variant should always be used as value types crossing over between language
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// boundaries might have strange behaviors.
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//
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// Slices of types should be converted into a single multiplicative type wrapping
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// a go slice with the methods `Size`, `Get` and `Set`. Further slice operations
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// should not be provided to limit the remote code complexity. Arrays should be
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// avoided as much as possible since they complicate bounds checking.
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//
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// If a method has multiple return values (e.g. some return + an error), those
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// are generated as output arguments in ObjC. To avoid weird generated names like
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// ret_0 for them, please always assign names to output variables if tuples.
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//
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// Note, a panic *cannot* cross over language boundaries, instead will result in
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// an undebuggable SEGFAULT in the process. For error handling only ever use error
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// returns, which may be the only or the second return.
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package geth
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