[op-conductor] Implement Raft FSM (#8685)

* Add raft FSM code

* Update docstring comment to correct one

go.mod

@@ -19,6 +19,7 @@ require (
 	github.com/google/uuid v1.5.0
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/hashicorp/golang-lru/v2 v2.0.5
+	github.com/hashicorp/raft v1.6.0
 	github.com/holiman/uint256 v1.2.3
 	github.com/ipfs/go-datastore v0.6.0
 	github.com/ipfs/go-ds-leveldb v0.5.0
@@ -53,6 +54,7 @@ require (
 	github.com/Microsoft/go-winio v0.6.1 // indirect
 	github.com/VictoriaMetrics/fastcache v1.12.1 // indirect
 	github.com/allegro/bigcache v1.2.1 // indirect
+	github.com/armon/go-metrics v0.4.1 // indirect
 	github.com/benbjohnson/clock v1.3.5 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bits-and-blooms/bitset v1.7.0 // indirect
@@ -105,6 +107,10 @@ require (
 	github.com/graph-gophers/graphql-go v1.3.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-bexpr v0.1.11 // indirect
+	github.com/hashicorp/go-hclog v1.5.0 // indirect
+	github.com/hashicorp/go-immutable-radix v1.0.0 // indirect
+	github.com/hashicorp/go-msgpack/v2 v2.1.1 // indirect
+	github.com/hashicorp/golang-lru v0.5.0 // indirect
 	github.com/hashicorp/golang-lru/arc/v2 v2.0.5 // indirect
 	github.com/holiman/billy v0.0.0-20230718173358-1c7e68d277a7 // indirect
 	github.com/holiman/bloomfilter/v2 v2.0.3 // indirect

go.sum

@@ -12,6 +12,7 @@ github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96/go.mod h1:bOv
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
 github.com/DataDog/zstd v1.5.2 h1:vUG4lAyuPCXO0TLbXvPv7EB7cNK1QV/luu55UHLrrn8=
 github.com/DataDog/zstd v1.5.2/go.mod h1:g4AWEaM3yOg3HYfnJ3YIawPnVdXJh9QME85blwSAmyw=
 github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
@@ -20,15 +21,22 @@ github.com/Microsoft/go-winio v0.6.1/go.mod h1:LRdKpFKfdobln8UmuiYcKPot9D2v6svN5
 github.com/VictoriaMetrics/fastcache v1.12.1 h1:i0mICQuojGDL3KblA7wUNlY5lOK6a4bwt3uRKnkZU40=
 github.com/VictoriaMetrics/fastcache v1.12.1/go.mod h1:tX04vaqcNoQeGLD+ra5pU5sWkuxnzWhEzLwhP9w653o=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156/go.mod h1:Cb/ax3seSYIx7SuZdm2G2xzfwmv3TPSk2ucNfQESPXM=
 github.com/allegro/bigcache v1.2.1 h1:hg1sY1raCwic3Vnsvje6TT7/pnZba83LeFck5NrFKSc=
 github.com/allegro/bigcache v1.2.1/go.mod h1:Cb/ax3seSYIx7SuZdm2G2xzfwmv3TPSk2ucNfQESPXM=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
+github.com/armon/go-metrics v0.4.1 h1:hR91U9KYmb6bLBYLQjyM+3j+rcd/UhE+G78SFnF8gJA=
+github.com/armon/go-metrics v0.4.1/go.mod h1:E6amYzXo6aW1tqzoZGT755KkbgrJsSdpwZ+3JqfkOG4=
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/benbjohnson/clock v1.3.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/benbjohnson/clock v1.3.5 h1:VvXlSJBzZpA/zum6Sj74hxwYI2DIxRWuNIoXAzHZz5o=
 github.com/benbjohnson/clock v1.3.5/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bits-and-blooms/bitset v1.7.0 h1:YjAGVd3XmtK9ktAbX8Zg2g2PwLIMjGREZJHlV4j7NEo=
@@ -61,6 +69,7 @@ github.com/cespare/cp v0.1.0 h1:SE+dxFebS7Iik5LK0tsi1k9ZCxEaFX4AjQmoyA+1dJk=
 github.com/cespare/cp v0.1.0/go.mod h1:SOGHArjBr4JWaSDEVpWpo/hNg6RoKrls6Oh40hiwW+s=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
 github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
@@ -70,6 +79,8 @@ github.com/chzyer/readline v1.5.0/go.mod h1:x22KAscuvRqlLoK9CsoYsmxoXZMMFVyOl86c
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/chzyer/test v0.0.0-20210722231415-061457976a23/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/cilium/ebpf v0.2.0/go.mod h1:To2CFviqOWL/M0gIMsvSMlqe7em/l1ALkX1PyjrX2Qs=
+github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
+github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ=
 github.com/cockroachdb/datadriven v1.0.3-0.20230413201302-be42291fc80f h1:otljaYPt5hWxV3MUfO5dFPFiOXg9CyG5/kCfayTqsJ4=
@@ -191,7 +202,11 @@ github.com/go-chi/render v1.0.1/go.mod h1:pq4Rr7HbnsdaeHagklXub+p6Wd16Af5l9koip1
 github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q=
 github.com/go-errors/errors v1.4.2 h1:J6MZopCL4uSllY1OfXM374weqZFFItUbrImctkmUxIA=
 github.com/go-errors/errors v1.4.2/go.mod h1:sIVyrIiJhuEF+Pj9Ebtd6P/rEYROXFi3BopGUQ5a5Og=
+github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
+github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
+github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
 github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
 github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
@@ -226,6 +241,7 @@ github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
 github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
 github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
 github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
@@ -252,6 +268,7 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/gofuzz v1.2.1-0.20220503160820-4a35382e8fc8 h1:Ep/joEub9YwcjRY6ND3+Y/w0ncE540RtGatVhtZL0/Q=
 github.com/google/gofuzz v1.2.1-0.20220503160820-4a35382e8fc8/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
@@ -283,12 +300,26 @@ github.com/hashicorp/errwrap v1.1.0 h1:OxrOeh75EUXMY8TBjag2fzXGZ40LB6IKw45YeGUDY
 github.com/hashicorp/errwrap v1.1.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
 github.com/hashicorp/go-bexpr v0.1.11 h1:6DqdA/KBjurGby9yTY0bmkathya0lfwF2SeuubCI7dY=
 github.com/hashicorp/go-bexpr v0.1.11/go.mod h1:f03lAo0duBlDIUMGCuad8oLcgejw4m7U+N8T+6Kz1AE=
+github.com/hashicorp/go-cleanhttp v0.5.0/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80=
+github.com/hashicorp/go-hclog v1.5.0 h1:bI2ocEMgcVlz55Oj1xZNBsVi900c7II+fWDyV9o+13c=
+github.com/hashicorp/go-hclog v1.5.0/go.mod h1:W4Qnvbt70Wk/zYJryRzDRU/4r0kIg0PVHBcfoyhpF5M=
+github.com/hashicorp/go-immutable-radix v1.0.0 h1:AKDB1HM5PWEA7i4nhcpwOrO2byshxBjXVn/J/3+z5/0=
+github.com/hashicorp/go-immutable-radix v1.0.0/go.mod h1:0y9vanUI8NX6FsYoO3zeMjhV/C5i9g4Q3DwcSNZ4P60=
+github.com/hashicorp/go-msgpack/v2 v2.1.1 h1:xQEY9yB2wnHitoSzk/B9UjXWRQ67QKu5AOm8aFp8N3I=
+github.com/hashicorp/go-msgpack/v2 v2.1.1/go.mod h1:upybraOAblm4S7rx0+jeNy+CWWhzywQsSRV5033mMu4=
 github.com/hashicorp/go-multierror v1.1.1 h1:H5DkEtf6CXdFp0N0Em5UCwQpXMWke8IA0+lD48awMYo=
 github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
+github.com/hashicorp/go-retryablehttp v0.5.3/go.mod h1:9B5zBasrRhHXnJnui7y6sL7es7NDiJgTc6Er0maI1Xs=
+github.com/hashicorp/go-uuid v1.0.0 h1:RS8zrF7PhGwyNPOtxSClXXj9HA8feRnJzgnI1RJCSnM=
+github.com/hashicorp/go-uuid v1.0.0/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
+github.com/hashicorp/golang-lru v0.5.0 h1:CL2msUPvZTLb5O648aiLNJw3hnBxN2+1Jq8rCOH9wdo=
+github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru/arc/v2 v2.0.5 h1:l2zaLDubNhW4XO3LnliVj0GXO3+/CGNJAg1dcN2Fpfw=
 github.com/hashicorp/golang-lru/arc/v2 v2.0.5/go.mod h1:ny6zBSQZi2JxIeYcv7kt2sH2PXJtirBN7RDhRpxPkxU=
 github.com/hashicorp/golang-lru/v2 v2.0.5 h1:wW7h1TG88eUIJ2i69gaE3uNVtEPIagzhGvHgwfx2Vm4=
 github.com/hashicorp/golang-lru/v2 v2.0.5/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
+github.com/hashicorp/raft v1.6.0 h1:tkIAORZy2GbJ2Trp5eUSggLXDPOJLXC+JJLNMMqtgtM=
+github.com/hashicorp/raft v1.6.0/go.mod h1:Xil5pDgeGwRWuX4uPUmwa+7Vagg4N804dz6mhNi6S7o=
 github.com/holiman/billy v0.0.0-20230718173358-1c7e68d277a7 h1:3JQNjnMRil1yD0IfZKHF9GxxWKDJGj8I0IqOUol//sw=
 github.com/holiman/billy v0.0.0-20230718173358-1c7e68d277a7/go.mod h1:5GuXa7vkL8u9FkFuWdVvfR5ix8hRB7DbOAaYULamFpc=
 github.com/holiman/bloomfilter/v2 v2.0.3 h1:73e0e/V0tCydx14a0SCYS/EWCxgwLZ18CZcZKVu0fao=
@@ -389,7 +420,9 @@ github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
 github.com/jrick/logrotate v1.0.0/go.mod h1:LNinyqDIJnpAur+b8yyulnQw/wDuN1+BYKlTRt3OuAQ=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
+github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
+github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
 github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
 github.com/karalabe/usb v0.0.3-0.20230711191512-61db3e06439c h1:AqsttAyEyIEsNz5WLRwuRwjiT5CMDUfLk6cFJDVPebs=
@@ -406,6 +439,7 @@ github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxv
 github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/koron/go-ssdp v0.0.4 h1:1IDwrghSKYM7yLf7XCzbByg2sJ/JcNOZRXS2jczTwz0=
 github.com/koron/go-ssdp v0.0.4/go.mod h1:oDXq+E5IL5q0U8uSBcoAXzTzInwy5lEgC91HoKtbmZk=
+github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
@@ -471,6 +505,7 @@ github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope
 github.com/mattn/go-colorable v0.1.7/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
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@@ -511,7 +546,9 @@ github.com/mitchellh/pointerstructure v1.2.1/go.mod h1:BRAsLI5zgXmw97Lf6s25bs8oh
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@@ -540,6 +577,7 @@ github.com/multiformats/go-multistream v0.5.0/go.mod h1:n6tMZiwiP2wUsR8DgfDWw1dy
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@@ -576,6 +614,8 @@ github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFSt
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@@ -583,6 +623,7 @@ github.com/peterh/liner v1.1.1-0.20190123174540-a2c9a5303de7/go.mod h1:CRroGNssy
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@@ -593,15 +634,25 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
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@@ -660,6 +711,7 @@ github.com/shurcooL/sanitized_anchor_name v0.0.0-20170918181015-86672fcb3f95/go.
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@@ -696,6 +748,7 @@ github.com/tklauser/go-sysconf v0.3.12 h1:0QaGUFOdQaIVdPgfITYzaTegZvdCjmYO52cSFA
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@@ -750,6 +803,7 @@ go.uber.org/zap v1.26.0/go.mod h1:dtElttAiwGvoJ/vj4IwHBS/gXsEu/pZ50mUIRWuG0so=
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@@ -791,11 +845,13 @@ golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73r
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@@ -834,6 +890,7 @@ golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -848,6 +905,7 @@ golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -865,11 +923,13 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
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 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211020174200-9d6173849985/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -957,6 +1017,7 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
 google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -973,6 +1034,7 @@ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWD
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=

op-conductor/consensus/raft_fsm.go

+package consensus
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"sync"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/hashicorp/raft"
+
+	"github.com/ethereum-optimism/optimism/op-service/eth"
+)
+
+var _ raft.FSM = (*unsafeHeadTracker)(nil)
+
+// unsafeHeadTracker implements raft.FSM for storing unsafe head payload into raft consensus layer.
+type unsafeHeadTracker struct {
+	mtx        sync.RWMutex
+	unsafeHead unsafeHeadData
+}
+
+// Apply implements raft.FSM, it applies the latest change (latest unsafe head payload) to FSM.
+func (t *unsafeHeadTracker) Apply(l *raft.Log) interface{} {
+	if l.Data == nil || len(l.Data) == 0 {
+		return fmt.Errorf("log data is nil or empty")
+	}
+	var data unsafeHeadData
+	if err := data.UnmarshalSSZ(bytes.NewReader(l.Data)); err != nil {
+		return err
+	}
+
+	t.mtx.Lock()
+	defer t.mtx.Unlock()
+	if t.unsafeHead.payload.BlockNumber < data.payload.BlockNumber {
+		t.unsafeHead = data
+	}
+
+	return nil
+}
+
+// Restore implements raft.FSM, it restores state from snapshot.
+func (t *unsafeHeadTracker) Restore(snapshot io.ReadCloser) error {
+	var data unsafeHeadData
+	if err := data.UnmarshalSSZ(snapshot); err != nil {
+		return fmt.Errorf("error unmarshalling snapshot: %w", err)
+	}
+
+	t.mtx.Lock()
+	defer t.mtx.Unlock()
+	t.unsafeHead = data
+	return nil
+}
+
+// Snapshot implements raft.FSM, it creates a snapshot of the current state.
+func (t *unsafeHeadTracker) Snapshot() (raft.FSMSnapshot, error) {
+	t.mtx.RLock()
+	defer t.mtx.RUnlock()
+
+	return &snapshot{
+		unsafeHead: t.unsafeHead,
+	}, nil
+}
+
+// UnsafeHead returns the latest unsafe head payload.
+func (t *unsafeHeadTracker) UnsafeHead() eth.ExecutionPayload {
+	t.mtx.RLock()
+	defer t.mtx.RUnlock()
+
+	return t.unsafeHead.payload
+}
+
+var _ raft.FSMSnapshot = (*snapshot)(nil)
+
+type snapshot struct {
+	log        log.Logger
+	unsafeHead unsafeHeadData
+}
+
+// Persist implements raft.FSMSnapshot, it writes the snapshot to the given sink.
+func (s *snapshot) Persist(sink raft.SnapshotSink) error {
+	if _, err := s.unsafeHead.MarshalSSZ(sink); err != nil {
+		if cerr := sink.Cancel(); cerr != nil {
+			s.log.Error("error cancelling snapshot sink", "error", cerr)
+		}
+		return fmt.Errorf("error writing data to sink: %w", err)
+	}
+
+	return sink.Close()
+}
+
+// Release implements raft.FSMSnapshot.
+// We don't really need to do anything within Release as the snapshot is not gonna change after creation, and we don't hold any reference to closable resources.
+func (s *snapshot) Release() {}
+
+// unsafeHeadData wraps the execution payload with the block version, and provides ease of use interfaces to marshal/unmarshal it.
+type unsafeHeadData struct {
+	version eth.BlockVersion
+	payload eth.ExecutionPayload
+}
+
+func (e *unsafeHeadData) MarshalSSZ(w io.Writer) (int, error) {
+	vb := byte(e.version)
+	n1, err := w.Write([]byte{vb})
+	if err != nil {
+		return n1, err
+	}
+
+	n2, err := e.payload.MarshalSSZ(w)
+	if err != nil {
+		return n1 + n2, err
+	}
+
+	return n1 + n2, nil
+}
+
+func (e *unsafeHeadData) UnmarshalSSZ(r io.Reader) error {
+	bs, err := io.ReadAll(r)
+	if err != nil {
+		return err
+	}
+
+	if len(bs) < 1 {
+		return fmt.Errorf("data is too short to contain version information")
+	}
+
+	vb, data := bs[0], bs[1:]
+	e.version = eth.BlockVersion(vb)
+	if err = e.payload.UnmarshalSSZ(e.version, uint32(len(data)), bytes.NewReader(data)); err != nil {
+		return err
+	}
+	return nil
+}

op-conductor/consensus/raft_fsm_test.go

+package consensus
+
+import (
+	"bytes"
+	"io"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/hashicorp/raft"
+	"github.com/stretchr/testify/require"
+
+	"github.com/ethereum-optimism/optimism/op-service/eth"
+)
+
+func TestUnsafeHeadData(t *testing.T) {
+	t.Run("should marshal and unmarshal unsafe head data correctly", func(t *testing.T) {
+		data := &unsafeHeadData{
+			version: eth.BlockV1,
+			payload: eth.ExecutionPayload{
+				BlockNumber: hexutil.Uint64(1),
+			},
+		}
+
+		var buf bytes.Buffer
+		_, err := data.MarshalSSZ(&buf)
+		require.NoError(t, err)
+
+		var unmarshalled unsafeHeadData
+		err = unmarshalled.UnmarshalSSZ(&buf)
+		require.NoError(t, err)
+		require.Equal(t, eth.BlockV1, unmarshalled.version)
+		require.Equal(t, hexutil.Uint64(1), unmarshalled.payload.BlockNumber)
+	})
+}
+
+func TestUnsafeHeadTracker(t *testing.T) {
+	tracker := &unsafeHeadTracker{
+		unsafeHead: unsafeHeadData{
+			version: eth.BlockV1,
+			payload: eth.ExecutionPayload{
+				BlockNumber: hexutil.Uint64(1),
+			},
+		},
+	}
+
+	t.Run("Apply", func(t *testing.T) {
+		unsafeHeadData := unsafeHeadData{
+			version: eth.BlockV2,
+			payload: eth.ExecutionPayload{
+				BlockNumber: hexutil.Uint64(2),
+				Withdrawals: &types.Withdrawals{},
+			},
+		}
+
+		var buf bytes.Buffer
+		_, err := unsafeHeadData.MarshalSSZ(&buf)
+		require.NoError(t, err)
+
+		l := raft.Log{Data: buf.Bytes()}
+		require.Nil(t, tracker.Apply(&l))
+		require.Equal(t, eth.BlockV2, tracker.unsafeHead.version)
+		require.Equal(t, hexutil.Uint64(2), tracker.unsafeHead.payload.BlockNumber)
+	})
+
+	t.Run("Restore", func(t *testing.T) {
+		data := unsafeHeadData{
+			version: eth.BlockV1,
+			payload: eth.ExecutionPayload{
+				BlockNumber: hexutil.Uint64(2),
+			},
+		}
+		mrc := NewMockReadCloser(data)
+		err := tracker.Restore(mrc)
+		require.NoError(t, err)
+		require.Equal(t, eth.BlockV1, tracker.unsafeHead.version)
+		require.Equal(t, hexutil.Uint64(2), tracker.unsafeHead.payload.BlockNumber)
+	})
+}
+
+type mockReadCloser struct {
+	currentPosition int
+	data            unsafeHeadData
+	buffer          []byte
+}
+
+func NewMockReadCloser(data unsafeHeadData) *mockReadCloser {
+	mrc := &mockReadCloser{
+		currentPosition: 0,
+		data:            data,
+		buffer:          make([]byte, 0),
+	}
+
+	var buf bytes.Buffer
+	if _, err := data.MarshalSSZ(&buf); err != nil {
+		return nil
+	}
+	mrc.buffer = buf.Bytes()
+
+	return mrc
+}
+
+func (m *mockReadCloser) Read(p []byte) (n int, err error) {
+	var end int
+	if len(m.buffer)-m.currentPosition < len(p) {
+		end = len(m.buffer)
+		err = io.EOF
+	} else {
+		end = m.currentPosition + len(p)
+		err = nil
+	}
+
+	copy(p, m.buffer[m.currentPosition:end])
+	m.currentPosition = end
+	return end, err
+}
+
+func (m *mockReadCloser) Close() error {
+	return nil
+}

op-service/eth/ssz.go

@@ -15,7 +15,7 @@ type BlockVersion int
 
 const ( // iota is reset to 0
 	BlockV1 BlockVersion = iota
-	BlockV2              = iota
+	BlockV2
 )
 
 // ExecutionPayload is the only SSZ type we have to marshal/unmarshal,
@@ -49,8 +49,10 @@ var payloadBufPool = sync.Pool{New: func() any {
 	return &x
 }}
 
-var ErrBadTransactionOffset = errors.New("transactions offset is smaller than extra data offset, aborting")
-var ErrBadWithdrawalsOffset = errors.New("withdrawals offset is smaller than transaction offset, aborting")
+var (
+	ErrBadTransactionOffset = errors.New("transactions offset is smaller than extra data offset, aborting")
+	ErrBadWithdrawalsOffset = errors.New("withdrawals offset is smaller than transaction offset, aborting")
+)
 
 func executionPayloadFixedPart(version BlockVersion) uint32 {
 	if version == BlockV2 {