From 36e654c131ce976251799dea8676b43c0147a6d6 Mon Sep 17 00:00:00 2001
From: Hanh <hanh425@gmail.com>
Date: Mon, 17 Oct 2022 23:33:00 +0800
Subject: [PATCH] Add fetch-params

---
 fetch-params.sh | 237 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/api/sync.rs |   1 -
 2 files changed, 237 insertions(+), 1 deletion(-)
 create mode 100755 fetch-params.sh

diff --git a/fetch-params.sh b/fetch-params.sh
new file mode 100755
index 0000000..b60fecb
--- /dev/null
+++ b/fetch-params.sh
@@ -0,0 +1,237 @@
+#!/bin/sh
+
+export LC_ALL=C
+set -eu
+
+uname_S=$(uname -s 2>/dev/null || echo not)
+
+if [ "$uname_S" = "Darwin" ]; then
+    PARAMS_DIR="$HOME/Library/Application Support/ZcashParams"
+else
+    PARAMS_DIR="$HOME/.zcash-params"
+fi
+
+# Commented out because these are unused; see below.
+#SPROUT_PKEY_NAME='sprout-proving.key'
+#SPROUT_VKEY_NAME='sprout-verifying.key'
+SAPLING_SPEND_NAME='sapling-spend.params'
+SAPLING_OUTPUT_NAME='sapling-output.params'
+SAPLING_SPROUT_GROTH16_NAME='sprout-groth16.params'
+DOWNLOAD_URL="https://download.z.cash/downloads"
+IPFS_HASH="/ipfs/QmXRHVGLQBiKwvNq7c2vPxAKz1zRVmMYbmt7G5TQss7tY7"
+
+SHA256CMD="$(command -v sha256sum || echo shasum)"
+SHA256ARGS="$(command -v sha256sum >/dev/null || echo '-a 256')"
+
+WGETCMD="$(command -v wget || echo '')"
+IPFSCMD="$(command -v ipfs || echo '')"
+CURLCMD="$(command -v curl || echo '')"
+
+# fetch methods can be disabled with ZC_DISABLE_SOMETHING=1
+ZC_DISABLE_WGET="${ZC_DISABLE_WGET:-}"
+ZC_DISABLE_IPFS="${ZC_DISABLE_IPFS:-}"
+ZC_DISABLE_CURL="${ZC_DISABLE_CURL:-}"
+
+LOCKFILE=/tmp/fetch_params.lock
+
+fetch_wget() {
+    if [ -z "$WGETCMD" ] || [ -n "$ZC_DISABLE_WGET" ]; then
+        return 1
+    fi
+
+    cat <<EOF
+
+Retrieving (wget): $DOWNLOAD_URL/$1
+EOF
+
+    wget \
+        --progress=dot:giga \
+        --output-document="$2" \
+        --continue \
+        --retry-connrefused --waitretry=3 --timeout=30 \
+        "$DOWNLOAD_URL/$1"
+}
+
+fetch_ipfs() {
+    if [ -z "$IPFSCMD" ] || [ -n "$ZC_DISABLE_IPFS" ]; then
+        return 1
+    fi
+
+    cat <<EOF
+
+Retrieving (ipfs): $IPFS_HASH/$1
+EOF
+
+    ipfs get --output "$2" "$IPFS_HASH/$1"
+}
+
+fetch_curl() {
+    if [ -z "$CURLCMD" ] || [ -n "$ZC_DISABLE_CURL" ]; then
+        return 1
+    fi
+
+    cat <<EOF
+
+Retrieving (curl): $DOWNLOAD_URL/$1
+EOF
+
+    curl \
+        --output "$2" \
+        -# -L -C - \
+        "$DOWNLOAD_URL/$1"
+
+}
+
+fetch_failure() {
+    cat >&2 <<EOF
+
+Failed to fetch the Zcash zkSNARK parameters!
+Try installing one of the following programs and make sure you're online:
+
+ * ipfs
+ * wget
+ * curl
+
+EOF
+    exit 1
+}
+
+fetch_params() {
+    # We only set these variables inside this function,
+    # and unset them at the end of the function.
+    filename="$1"
+    output="$2"
+    dlname="${output}.dl"
+    expectedhash="$3"
+
+    if ! [ -f "$output" ]
+    then
+        for i in 1 2
+        do
+            for method in wget ipfs curl failure; do
+                if "fetch_$method" "${filename}.part.${i}" "${dlname}.part.${i}"; then
+                    echo "Download of part ${i} successful!"
+                    break
+                fi
+            done
+        done
+
+        for i in 1 2
+        do
+            if ! [ -f "${dlname}.part.${i}" ]
+            then
+                fetch_failure
+            fi
+        done
+
+        cat "${dlname}.part.1" "${dlname}.part.2" > "${dlname}"
+        rm "${dlname}.part.1" "${dlname}.part.2"
+
+        "$SHA256CMD" $SHA256ARGS -c <<EOF
+$expectedhash  $dlname
+EOF
+
+        # Check the exit code of the shasum command:
+        CHECKSUM_RESULT=$?
+        if [ $CHECKSUM_RESULT -eq 0 ]; then
+            mv -v "$dlname" "$output"
+        else
+            echo "Failed to verify parameter checksums!" >&2
+            exit 1
+        fi
+    fi
+
+    unset -v filename
+    unset -v output
+    unset -v dlname
+    unset -v expectedhash
+}
+
+# Use flock to prevent parallel execution.
+lock() {
+    if [ "$uname_S" = "Darwin" ]; then
+        if shlock -f ${LOCKFILE} -p $$; then
+            return 0
+        else
+            return 1
+        fi
+    else
+        # create lock file
+        eval "exec 9>$LOCKFILE"
+        # acquire the lock
+        flock -n 9 \
+            && return 0 \
+            || return 1
+    fi
+}
+
+exit_locked_error() {
+    echo "Only one instance of fetch-params.sh can be run at a time." >&2
+    exit 1
+}
+
+main() {
+
+    lock fetch-params.sh \
+    || exit_locked_error
+
+    cat <<EOF
+Zcash - fetch-params.sh
+
+This script will fetch the Zcash zkSNARK parameters and verify their
+integrity with sha256sum.
+
+If they already exist locally, it will exit now and do nothing else.
+EOF
+
+    # Now create PARAMS_DIR and insert a README if necessary:
+    if ! [ -d "$PARAMS_DIR" ]
+    then
+        mkdir -p "$PARAMS_DIR"
+        README_PATH="$PARAMS_DIR/README"
+        cat >> "$README_PATH" <<EOF
+This directory stores common Zcash zkSNARK parameters. Note that it is
+distinct from the daemon's -datadir argument because the parameters are
+large and may be shared across multiple distinct -datadir's such as when
+setting up test networks.
+EOF
+
+        # This may be the first time the user's run this script, so give
+        # them some info, especially about bandwidth usage:
+        cat <<EOF
+The complete parameters are currently just under 1.7GB in size, so plan 
+accordingly for your bandwidth constraints. If the Sprout parameters are
+already present the additional Sapling parameters required are just under 
+800MB in size. If the files are already present and have the correct 
+sha256sum, no networking is used.
+
+Creating params directory. For details about this directory, see:
+$README_PATH
+
+EOF
+    fi
+
+    cd "$PARAMS_DIR"
+
+    # Sprout parameters:
+    # Commented out because they are unneeded, but we will eventually update
+    # this to delete the parameters if possible.
+    #fetch_params "$SPROUT_PKEY_NAME" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7"
+    #fetch_params "$SPROUT_VKEY_NAME" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82"
+
+    # Sapling parameters:
+    fetch_params "$SAPLING_SPEND_NAME" "$PARAMS_DIR/$SAPLING_SPEND_NAME" "8e48ffd23abb3a5fd9c5589204f32d9c31285a04b78096ba40a79b75677efc13"
+    fetch_params "$SAPLING_OUTPUT_NAME" "$PARAMS_DIR/$SAPLING_OUTPUT_NAME" "2f0ebbcbb9bb0bcffe95a397e7eba89c29eb4dde6191c339db88570e3f3fb0e4"
+    fetch_params "$SAPLING_SPROUT_GROTH16_NAME" "$PARAMS_DIR/$SAPLING_SPROUT_GROTH16_NAME" "b685d700c60328498fbde589c8c7c484c722b788b265b72af448a5bf0ee55b50"
+}
+
+if [ "x${1:-}" = 'x--testnet' ]
+then
+    echo "NOTE: testnet now uses the mainnet parameters, so the --testnet argument"
+    echo "is no longer needed (ignored)"
+    echo ""
+fi
+
+main
+rm -f $LOCKFILE
+exit 0
diff --git a/src/api/sync.rs b/src/api/sync.rs
index bc02121..d353470 100644
--- a/src/api/sync.rs
+++ b/src/api/sync.rs
@@ -17,7 +17,6 @@ pub async fn coin_sync(
     get_tx: bool,
     anchor_offset: u32,
     max_cost: u32,
-    downloaded_callback: impl Fn(u64) + Send + 'static,
     progress_callback: impl Fn(Progress) + Send + 'static,
     cancel: &'static std::sync::Mutex<bool>,
 ) -> anyhow::Result<()> {