wasm-client: add WASM client and example web page

Author: guggero

.gitignore

@@ -13,3 +13,5 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+wasm-client.wasm

Makefile

@@ -16,6 +16,8 @@ GOTEST := go test -v
 
 GOFILES_NOVENDOR = $(shell find . -type f -name '*.go' -not -path "./vendor/*")
 
+LDFLAGS := -s -w -buildid=
+
 RM := rm -f
 CP := cp
 MAKE := make
@@ -43,6 +45,12 @@ build:
 	@$(call print, "Building terminal-connect.")
 	$(GOBUILD) $(PKG)/...
 
+wasm:
+	# The appengine build tag is needed because of the jessevdk/go-flags library
+	# that has some OS specific terminal code that doesn't compile to WASM.
+	GOOS=js GOARCH=wasm go build -trimpath -ldflags="$(LDFLAGS)" -tags="appengine" -v -o wasm-client.wasm $(PKG)/cmd/wasm-client
+	$(CP) wasm-client.wasm example/wasm-client.wasm
+
 # =======
 # TESTING
 # =======
@@ -83,3 +91,5 @@ rpc-check: rpc
 	@$(call print, "Verifying protos.")
 	if test -n "$$(git describe --dirty | grep dirty)"; then echo "Protos not properly formatted or not compiled with correct version!"; git status; git diff; exit 1; fi
 
+rpc-stubs:
+	cd cmd/wasm-client; ./gen_stubs.sh

cmd/wasm-client/config.go

@@ -0,0 +1,10 @@
+// +build js
+
+package main
+
+type config struct {
+	MailboxServer    string `long:"mailboxserver" description:"Use the mailbox server with the given address to connect to lnd"`
+	MailboxPassword  string `long:"mailboxpassword" description:"The password for connecting to the mailbox"`
+	MailboxDevServer bool   `long:"mailboxdevserver" description:"The mailbox server is a development server, turn off TLS validation"`
+	DebugLevel       string `long:"debuglevel" description:"Logging level for all subsystems {trace, debug, info, warn, error, critical} -- You may also specify <subsystem>=<level>,<subsystem2>=<level>,... to set the log level for individual subsystems -- Use show to list available subsystems"`
+}

cmd/wasm-client/gen_stubs.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+
+function import_path() {
+  local pkg=$1
+  # Find out what version of pool to use for the imported auctioneer.proto by
+  # parsing the go.mod file.
+  LAST_LINE=$(grep "$pkg" ../../go.mod | tail -n 1)
+  PKG_PATH=""
+  if [[ $LAST_LINE =~ "replace" ]]
+  then
+    # There is a replace directive. Use awk to split by spaces then extract field
+    # 4 and 5 and stitch them together with an @ which will resolve into
+    # github.com/lightninglabs/[email protected].
+    PKG_PATH=$(echo $LAST_LINE | awk -F " " '{ print $4"@"$5 }')
+  else
+    # This is a normal directive, just combine field 1 and 2 with an @.
+    PKG_PATH=$(echo $LAST_LINE | awk -F " " '{ print $1"@"$2 }')
+  fi
+  echo "$GOPATH/pkg/mod/$PKG_PATH"
+}
+
+falafel=$(which falafel)
+
+# Name of the package for the generated APIs.
+pkg="main"
+
+# The package where the protobuf definitions originally are found.
+target_pkg="github.com/lightningnetwork/lnd/lnrpc"
+
+lnd_src=$(import_path "github.com/lightningnetwork/lnd ")
+opts="package_name=$pkg,target_package=$target_pkg,api_prefix=1,js_stubs=1,build_tags=// +build js"
+protoc -I/usr/local/include -I. -I"$lnd_src/lnrpc" \
+       --plugin=protoc-gen-custom=$falafel\
+       --custom_out=. \
+       --custom_opt="$opts" \
+       --proto_path="$1" \
+       rpc.proto stateservice.proto
+
+target_pkg="github.com/lightningnetwork/lnd/lnrpc/verrpc"
+opts="package_name=$pkg,target_package=$target_pkg,api_prefix=1,js_stubs=1,build_tags=// +build js"
+protoc -I/usr/local/include -I. -I"$lnd_src/lnrpc" \
+       --plugin=protoc-gen-custom=$falafel\
+       --custom_out=. \
+       --custom_opt="$opts" \
+       --proto_path="$1" \
+       verrpc/verrpc.proto