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concordium
smartcontractinteractions
Commits
f3f661fa
Commit
f3f661fa
authored
Jun 25, 2019
by
Jakob Botsch Nielsen
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Sidebyside
theories/Automation.v
View file @
f3f661fa
(
*
This
file
implements
various
helper
tactics
*
)
From
Coq
Require
Import
Eqdep
List
Omega
Permutation
.
Import
ListNotations
.
...
...
@@ 65,6 +67,7 @@ Local Ltac perm_simplify_round :=

[
H
:
Permutation
?
l1
?
l2

_
]
=>
rewrite
H
end
.
(
*
Automatically
tries
to
solve
obvious
"Permutation x y"
goals
.
*
)
Ltac
perm_simplify
:=
repeat
perm_simplify_round
;
cbn
;
...
...
theories/Blockchain.v
View file @
f3f661fa
(
*
This
file
defines
blockchains
,
both
a
contract
'
s
view
(
which
is
more
computational
)
and
the
semantics
of
executing
smart
contracts
in
a
blockchain
.
The
most
important
types
are
:
*
The
ChainBase
type
,
describing
basic
assumptions
made
of
any
blockchain
.
In
most
cases
we
will
abstract
over
this
type
.
*
The
Chain
type
,
describing
a
smart
contract
'
s
view
of
the
blockchain
.
This
is
the
the
data
that
can
be
accessed
by
smart
contracts
.
*
The
Action
type
,
describing
how
smart
contracts
(
and
external
users
)
interact
with
the
blockchain
.
We
allow
transfers
,
calls
and
deployment
of
contracts
.
*
The
WeakContract
type
,
describing
a
"weak"
or
"stringly"
typed
version
of
smart
contracts
.
Contracts
are
just
two
functions
init
and
receive
to
respectively
initialize
state
on
deployment
and
to
update
state
when
receiving
messages
.
The
weak
version
of
contracts
means
that
the
state
/
message
/
setup
types
,
which
would
normally
vary
with
contracts
,
are
stored
in
a
serialized
format
.
*
The
Contract
type
,
describing
a
more
strongly
typed
version
of
a
contract
.
This
is
the
same
as
the
above
except
we
abstract
over
the
appropriate
types
.
Users
of
the
framework
will
mostly
need
to
deal
with
this
.
The
next
types
deal
with
semantics
.
*
The
Environment
type
.
This
augments
the
Chain
type
with
more
information
.
Environment
can
be
thought
of
as
the
information
that
a
realistic
blockchain
implementation
would
need
to
keep
track
of
to
implement
operations
.
For
instance
,
it
is
reasonable
to
assume
that
an
implementation
needs
to
access
the
state
of
contracts
,
but
not
to
assume
that
it
needs
to
store
the
full
transaction
history
of
all
addresses
.
*
The
ActionEvaluation
type
.
This
specifies
how
to
evaluate
actions
returned
by
contracts
or
input
in
blocks
.
This
related
an
environment
and
action
to
a
new
environment
and
list
of
new
actions
to
execute
.
*
The
ChainState
type
.
This
augments
the
Environment
type
with
a
queue
of
"outstanding"
actions
that
need
to
be
executed
.
For
instance
,
when
a
block
is
added
,
its
actions
are
put
into
this
queue
.
*
The
ChainStep
type
.
This
specifies
how
the
blockchain
should
execute
smart
contracts
,
and
how
new
blocks
are
added
.
It
relates
a
ChainState
to
a
new
ChainState
.
There
are
steps
to
allow
adding
blocks
,
evaluating
actions
in
the
queue
and
to
permute
the
queue
(
allowing
to
model
any
execution
order
).
*
The
ChainTrace
type
.
This
just
represents
a
sequence
of
steps
.
If
a
trace
ends
in
a
state
it
means
that
state
is
reachable
and
there
is
a
"semantically correct"
way
of
executing
to
get
to
this
state
.
This
type
records
the
full
history
of
a
blockchain
'
s
execution
and
it
would
thus
be
unrealistic
to
extract
.
*
The
ChainBuilderType
type
.
This
is
a
typeclass
for
implementations
of
blockchains
,
where
these
implementations
need
to
prove
that
they
satisfy
our
semantics
.
*
)
From
Coq
Require
Import
Arith
ZArith
.
From
Coq
Require
Import
List
.
From
Coq
Require
Import
Psatz
.
...
...
theories/ChainedList.v
View file @
f3f661fa
(
*
This
file
implements
a
chained
list
.
This
is
a
list
for
which
each
element
is
a
link
between
a
from
and
to
element
of
a
provided
"link"
type
.
That
is
,
each
link
(
element
)
has
a
"from"
point
that
must
match
the
previous
element
'
s
"to"
point
.
For
that
reason
this
is
also
a
snoc
list
.
Note
that
this
is
not
unlike
fhlist
from
CPDT
,
except
we
place
further
restrictions
on
it
.
*
)
(
*
This
file
implements
a
'
chained
list
'
.
This
can
essentially
be
thought
of
as
the
proof

relevant
transitive
reflexive
closure
of
a
relation
.
That
is
,
each
link
(
element
)
has
a
"from"
point
that
must
match
the
previous
element
'
s
"to"
point
.
*
)
From
SmartContracts
Require
Import
Automation
.
Section
ChainedList
.
Context
{
Point
:
Type
}
{
Link
:
Point
>
Point
>
Type
}
.
...
...
theories/Circulation.v
View file @
f3f661fa
(
*
In
this
file
we
prove
various
results
about
the
circulation
of
coins
in
any
chain
implementing
a
chain
type
.
More
specifically
,
we
show
that
the
circulation
does
not
change
during
execution
of
blocks
.
This
is
proven
under
the
(
implicit
)
assumption
that
the
address
space
is
finite
.
*
)
(
*
In
this
file
we
prove
that
the
circulation
of
any
blockchain
implementing
our
semantics
is
as
expected
:
the
sum
of
all
rewards
paid
out
in
blocks
.
*
)
From
Coq
Require
Import
List
Permutation
ZArith
Psatz
Morphisms
.
From
SmartContracts
Require
Import
Automation
Blockchain
Extras
Finite
ChainedList
.
From
RecordUpdate
Require
Import
RecordSet
.
...
...
@@ 15,11 +13,12 @@ Local Open Scope Z.
Definition
circulation
(
chain
:
Chain
)
:=
sumZ
(
account_balance
chain
)
(
elements
Address
).
(
*
We
then
prove
that
over
any
single
action
,
the
circulation
is
preserved
.
(
*
We
prove
first
that
over
any
single
action
,
the
circulation
is
preserved
.
The
idea
behind
this
proof
is
that
addrs
contain
from
and
to
so
we
can
move
them
to
the
beginning
of
the
sum
and
it
easily
follows
that
the
sum
of
their
balances
is
the
same
as
before
.
For
the
rest
of
the
list
the
total
balance
will
then
not
be
affected
which
follows
by
induction
.
*
)
Lemma
address_reorganize
{
a
b
:
Address
}
:
a
<>
b
>
exists
suf
,
Permutation
([
a
;
b
]
++
suf
)
(
elements
Address
).
...
...
@@ 101,6 +100,8 @@ Proof.
end
.
Qed
.
(
*
Now
we
prove
that
adding
a
block
_
does_
increase
the
circulation
by
what
we
would
expect
.
*
)
Lemma
circulation_add_new_block
header
env
:
circulation
(
add_new_block_to_env
header
env
)
=
(
circulation
env
+
block_reward
header
)
%
Z
.
...
...
@@ 131,6 +132,7 @@ Proof.
lia
.
Qed
.
(
*
We
then
get
a
lemma
over
steps
*
)
Lemma
step_circulation
{
prev
next
}
(
step
:
ChainStep
prev
next
)
:
circulation
next
=
match
step
with
...
...
@@ 148,6 +150,7 @@ Proof.
intuition
.
Qed
.
(
*
And
combining
these
gives
the
final
result
.
*
)
Theorem
chain_trace_circulation
{
state
:
ChainState
}
(
trace
:
ChainTrace
empty_state
state
)
:
...
...
theories/Congress.v
View file @
f3f661fa
(
*
In
this
file
we
implement
a
Congress
and
prove
it
correct
up
to
a
specification
.
The
Congress
is
a
simplified
version
of
the
DAO
in
which
members
vote
on
proposals
.
We
implement
the
contract
in
Gallina
and
then
show
that
it
does
not
send
out
more
transactions
than
expected
from
the
number
of
created
proposals
.
*
)
From
Coq
Require
Import
ZArith
.
From
Coq
Require
Import
Morphisms
.
From
Coq
Require
Import
Psatz
.
...
...
theories/Congress_Buggy.v
View file @
f3f661fa
(
*
In
this
file
we
introduce
a
reentrancy
problem
in
the
Congress
contract
described
in
Congress
.
v
.
We
then
use
one
of
our
blockchain
implementations
(
the
depth
first
local
block
chain
)
to
prove
that
this
version
can
send
out
too
many
transactions
.
This
is
done
by
constructing
a
contract
that
actually
exploits
this
version
of
the
Congress
and
then
just
asking
Coq
to
compute
.
*
)
From
Coq
Require
Import
ZArith
.
From
Coq
Require
Import
Morphisms
.
From
Coq
Require
Import
Psatz
.
...
...
theories/Containers.v
View file @
f3f661fa
(
*
This
file
provides
an
interface
for
std
++
'
s
finite
maps
*
)
From
Coq
Require
Import
List
.
From
Coq
Require
Import
ZArith
.
From
Coq
Require
Import
Permutation
.
...
...
theories/Extras.v
View file @
f3f661fa
(
*
This
file
implements
various
helper
functions
and
proofs
*
)
From
Coq
Require
Import
ZArith
.
From
Coq
Require
Import
List
.
From
Coq
Require
Import
Permutation
.
...
...
theories/Finite.v
View file @
f3f661fa
(
*
This
file
captures
what
it
means
for
a
type
to
be
finite
*
)
From
Coq
Require
Import
List
.
Import
ListNotations
.
...
...
theories/LocalBlockchain.v
View file @
f3f661fa
(
*
This
file
gives
two
different
implementations
of
the
blockchain
execution
layer
defined
in
Blockchain
.
v
.
Both
versions
are
execution
layers
using
std
++
'
s
finite
maps
and
are
thus
relatively
efficient
.
They
differ
in
execution
order
:
one
uses
a
depth

first
execution
order
,
while
the
other
uses
a
breadth

first
execution
order
.
*
)
From
Coq
Require
Import
ZArith
.
From
Coq
Require
Import
Permutation
.
From
Coq
Require
Import
Morphisms
.
...
...
theories/LocalBlockchainTests.v
View file @
f3f661fa
(
*
This
file
computes
with
the
Congress
and
an
actual
blockchain
implementation
,
showing
that
everything
computes
from
within
Coq
.
It
also
contains
specializations
of
the
results
proven
in
Congress
.
v
to
our
particular
implementations
of
blockchains
.
*
)
From
SmartContracts
Require
Import
Monads
.
From
SmartContracts
Require
Import
Blockchain
.
From
SmartContracts
Require
Import
LocalBlockchain
.
...
...
theories/Monads.v
View file @
f3f661fa
(
*
This
file
defines
some
helpful
notations
for
the
option
monad
.
*
)
Definition
option_bind
{
A
B
:
Type
}
(
v
:
option
A
)
(
f
:
A
>
option
B
)
:
option
B
:=
match
v
with

Some
val
=>
f
val
...
...
theories/Serializable.v
View file @
f3f661fa
(
*
This
file
defines
a
common
storage
format
for
countable
types
.
This
format
,
SerializedValue
,
is
either
a
unit
/
int
/
bool
or
a
pair
/
list
of
these
.
We
also
define
Serializable
as
a
type
class
capturing
that
a
type
can
be
converted
from
and
to
this
format
.
*
)
From
Coq
Require
Import
ZArith
.
From
SmartContracts
Require
Import
Monads
.
From
SmartContracts
Require
Import
Containers
.
...
...
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