Use multisign for attestations

go.mod

@@ -3,57 +3,41 @@ module github.com/attestantio/vouch
 go 1.14
 
 require (
-	cloud.google.com/go v0.69.1 // indirect
+	cloud.google.com/go v0.70.0 // indirect
 	github.com/OneOfOne/xxhash v1.2.5 // indirect
-	github.com/attestantio/dirk v0.9.0
+	github.com/attestantio/dirk v0.9.1
 	github.com/attestantio/go-eth2-client v0.6.8
-	github.com/aws/aws-sdk-go v1.35.9
-	github.com/ferranbt/fastssz v0.0.0-20201016163051-9c5a44b9b68d
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
-	github.com/google/uuid v1.1.2 // indirect
+	github.com/aws/aws-sdk-go v1.35.14
+	github.com/ferranbt/fastssz v0.0.0-20201020132831-68dc48984fd3
 	github.com/grpc-ecosystem/grpc-gateway v1.15.2 // indirect
-	github.com/herumi/bls-eth-go-binary v0.0.0-20201015064056-ab4d637175e8
-	github.com/magiconair/properties v1.8.4 // indirect
-	github.com/minio/highwayhash v1.0.1 // indirect
+	github.com/herumi/bls-eth-go-binary v0.0.0-20201019012252-4b463a10c225
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/opentracing/opentracing-go v1.2.0
-	github.com/pelletier/go-toml v1.8.1 // indirect
 	github.com/petermattis/goid v0.0.0-20180202154549-b0b1615b78e5 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.8.0
-	github.com/prometheus/common v0.14.0 // indirect
-	github.com/prometheus/procfs v0.2.0 // indirect
-	github.com/prysmaticlabs/ethereumapis v0.0.0-20201003171600-a72e5f77d233
+	github.com/prysmaticlabs/ethereumapis v0.0.0-20201020182719-7f66dae2bbba
 	github.com/prysmaticlabs/go-bitfield v0.0.0-20200618145306-2ae0807bef65
 	github.com/rs/zerolog v1.20.0
 	github.com/sasha-s/go-deadlock v0.2.0
-	github.com/spaolacci/murmur3 v1.1.0 // indirect
-	github.com/spf13/afero v1.4.1 // indirect
-	github.com/spf13/cast v1.3.1 // indirect
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/sirupsen/logrus v1.6.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.7.1
 	github.com/stretchr/testify v1.6.1
 	github.com/uber/jaeger-client-go v2.25.0+incompatible
-	github.com/uber/jaeger-lib v2.4.0+incompatible // indirect
 	github.com/wealdtech/go-bytesutil v1.1.1
-	github.com/wealdtech/go-eth2-types/v2 v2.5.0
-	github.com/wealdtech/go-eth2-wallet v1.14.1
-	github.com/wealdtech/go-eth2-wallet-dirk v1.0.4
-	github.com/wealdtech/go-eth2-wallet-encryptor-keystorev4 v1.1.1
-	github.com/wealdtech/go-eth2-wallet-hd/v2 v2.5.1
-	github.com/wealdtech/go-eth2-wallet-store-filesystem v1.16.1
-	github.com/wealdtech/go-eth2-wallet-store-scratch v1.6.0
-	github.com/wealdtech/go-eth2-wallet-types/v2 v2.8.0
+	github.com/wealdtech/go-eth2-types/v2 v2.5.1
+	github.com/wealdtech/go-eth2-wallet v1.14.2
+	github.com/wealdtech/go-eth2-wallet-dirk v1.1.1
+	github.com/wealdtech/go-eth2-wallet-encryptor-keystorev4 v1.1.2
+	github.com/wealdtech/go-eth2-wallet-hd/v2 v2.5.2
+	github.com/wealdtech/go-eth2-wallet-store-filesystem v1.16.13
+	github.com/wealdtech/go-eth2-wallet-store-scratch v1.6.1
+	github.com/wealdtech/go-eth2-wallet-types/v2 v2.8.1
 	github.com/wealdtech/go-majordomo v1.0.1
-	go.uber.org/atomic v1.7.0 // indirect
-	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897 // indirect
-	golang.org/x/net v0.0.0-20201016165138-7b1cca2348c0 // indirect
-	golang.org/x/sync v0.0.0-20201008141435-b3e1573b7520
-	golang.org/x/sys v0.0.0-20201017003518-b09fb700fbb7 // indirect
-	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20201015140912-32ed001d685c // indirect
-	google.golang.org/grpc v1.33.0
-	gopkg.in/ini.v1 v1.62.0 // indirect
+	golang.org/x/net v0.0.0-20201026091529-146b70c837a4 // indirect
+	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
+	google.golang.org/genproto v0.0.0-20201022181438-0ff5f38871d5 // indirect
+	google.golang.org/grpc v1.33.1
 	gotest.tools v2.2.0+incompatible
 )

go.sum

@@ -14,11 +14,9 @@ cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZ
 cloud.google.com/go v0.62.0 h1:RmDygqvj27Zf3fCQjQRtLyC7KwFcHkeJitcO0OoGOcA=
 cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
 cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go v0.66.0 h1:DZeAkuQGQqnm9Xv36SbMJEU8aFBz4wL04UpMWPWwjzg=
-cloud.google.com/go v0.66.0/go.mod h1:dgqGAjKCDxyhGTtC9dAREQGUJpkceNm1yt590Qno0Ko=
 cloud.google.com/go v0.68.0/go.mod h1:91NO4SCDjUfe1zeC0f4/dpckkUNpuNEyqm4X2KLrzNQ=
-cloud.google.com/go v0.69.1 h1:01WAtK12Fes1PhlpkgDf6iifgXbrdczf+6Cec2S+Aa8=
-cloud.google.com/go v0.69.1/go.mod h1:nBQK+D2Y4slKAj03c6wkILB3imWdzebeEZgWHEmGREE=
+cloud.google.com/go v0.70.0 h1:ujhG1RejZYi+HYfJNlgBh3j/bVKD8DewM7AkJ5UPyBc=
+cloud.google.com/go v0.70.0/go.mod h1:/UTKYRQTWjVnSe7nGvoSzxEFUELzSI/yAYd0JQT6cRo=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
@@ -44,6 +42,7 @@ github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym
 github.com/DataDog/zstd v1.4.1/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
 github.com/DataDog/zstd v1.4.5 h1:EndNeuB0l9syBZhut0wns3gV1hL8zX8LIu6ZiVHWLIQ=
 github.com/DataDog/zstd v1.4.5/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
+github.com/HdrHistogram/hdrhistogram-go v0.9.0 h1:dpujRju0R4M/QZzcnR1LH1qm+TVG3UzkWdp5tH1WMcg=
 github.com/HdrHistogram/hdrhistogram-go v0.9.0/go.mod h1:nxrse8/Tzg2tg3DZcZjm6qEclQKK70g0KxO61gFFZD4=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
@@ -68,17 +67,8 @@ github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
-github.com/attestantio/dirk v0.8.0 h1:N3/djI47sKkXV6BWbhwxfbiO2E4TjA3f3NqTayWXyNE=
-github.com/attestantio/dirk v0.9.0 h1:duHmWzjJDALFTu8Fay5nKZ9IXhVf2o6ufE08G7vb1zw=
-github.com/attestantio/dirk v0.9.0/go.mod h1:oWsyIb/OXdx9pvDQqS3hdFBB1eFaYnrNjuvLtVwo69w=
-github.com/attestantio/go-eth2-client v0.6.4 h1:EfnOCWlPrmLXBxMyctXUOEIcn61/QnYvnIBz5aIH8Bg=
-github.com/attestantio/go-eth2-client v0.6.4/go.mod h1:lYEayGHzZma9HMUJgyxFIzDWRck8n2IedP7KTkIwe0g=
-github.com/attestantio/go-eth2-client v0.6.5 h1:IaPJfxOTqHdkfmeuy6MntsuLEoJipf7V6m4njBE4F6w=
-github.com/attestantio/go-eth2-client v0.6.5/go.mod h1:lYEayGHzZma9HMUJgyxFIzDWRck8n2IedP7KTkIwe0g=
-github.com/attestantio/go-eth2-client v0.6.6 h1:rgqG4KDyLDw75vOqnFnJ/nAXzkp6EDFaOctMzPJYNWI=
-github.com/attestantio/go-eth2-client v0.6.6/go.mod h1:lYEayGHzZma9HMUJgyxFIzDWRck8n2IedP7KTkIwe0g=
-github.com/attestantio/go-eth2-client v0.6.7 h1:QphgX2XL8HMxZ3wo7RSyBhBJr9eKHNJU0GLWtVmxYG8=
-github.com/attestantio/go-eth2-client v0.6.7/go.mod h1:lYEayGHzZma9HMUJgyxFIzDWRck8n2IedP7KTkIwe0g=
+github.com/attestantio/dirk v0.9.1 h1:oof1Xm0uI4a2T9vhQB+f3Wjlngd2rnfsKi8aj1wqNh0=
+github.com/attestantio/dirk v0.9.1/go.mod h1:oWsyIb/OXdx9pvDQqS3hdFBB1eFaYnrNjuvLtVwo69w=
 github.com/attestantio/go-eth2-client v0.6.8 h1:Lsjx5P0pB8ruZBfJUbqy5hpevD4Zt8Z0Lg4V5m2s53E=
 github.com/attestantio/go-eth2-client v0.6.8/go.mod h1:lYEayGHzZma9HMUJgyxFIzDWRck8n2IedP7KTkIwe0g=
 github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
@@ -86,13 +76,9 @@ github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN
 github.com/aws/aws-sdk-go v1.33.5/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
 github.com/aws/aws-sdk-go v1.33.17 h1:vngPRchZs603qLtJH7lh2pBCDqiFxA9+9nDWJ5WYJ5A=
 github.com/aws/aws-sdk-go v1.33.17/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
-github.com/aws/aws-sdk-go v1.34.31 h1:408wh5EHKzxyby8JpYfnn1w3fsF26AIU0o1kbJoRy7E=
-github.com/aws/aws-sdk-go v1.34.31/go.mod h1:H7NKnBqNVzoTJpGfLrQkkD+ytBA93eiDYi/+8rV9s48=
 github.com/aws/aws-sdk-go v1.35.7/go.mod h1:tlPOdRjfxPBpNIwqDj61rmsnA85v9jc0Ps9+muhnW+k=
-github.com/aws/aws-sdk-go v1.35.8 h1:+S3BTWePYImKLh7DUJxMVm+/FQUnmHADsMzo/psHFr4=
-github.com/aws/aws-sdk-go v1.35.8/go.mod h1:tlPOdRjfxPBpNIwqDj61rmsnA85v9jc0Ps9+muhnW+k=
-github.com/aws/aws-sdk-go v1.35.9 h1:b1HiUpdkFLJyoOQ7zas36YHzjNHH0ivHx/G5lWBeg+U=
-github.com/aws/aws-sdk-go v1.35.9/go.mod h1:tlPOdRjfxPBpNIwqDj61rmsnA85v9jc0Ps9+muhnW+k=
+github.com/aws/aws-sdk-go v1.35.14 h1:nucVVXXjAr9UkmYCBWxQWRuYa5KOlaXjuJGg2ulW0K0=
+github.com/aws/aws-sdk-go v1.35.14/go.mod h1:tlPOdRjfxPBpNIwqDj61rmsnA85v9jc0Ps9+muhnW+k=
 github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
@@ -167,8 +153,8 @@ github.com/ferranbt/fastssz v0.0.0-20200514094935-99fccaf93472/go.mod h1:LlFXPmg
 github.com/ferranbt/fastssz v0.0.0-20200728110133-0b6e349af87a/go.mod h1:DyEu2iuLBnb/T51BlsiO3yLYdJC6UbGMrIkqK1KmQxM=
 github.com/ferranbt/fastssz v0.0.0-20200826142241-3a913c5a1313 h1:8DS7uDmUkGF6UKNU1HivEsjrTusxLPb05KUr/D8ONWQ=
 github.com/ferranbt/fastssz v0.0.0-20200826142241-3a913c5a1313/go.mod h1:DyEu2iuLBnb/T51BlsiO3yLYdJC6UbGMrIkqK1KmQxM=
-github.com/ferranbt/fastssz v0.0.0-20201016163051-9c5a44b9b68d h1:gHW6nLqM4iq3m9sHAkWWFvpeSoEfRhzv3HZG4jcm/J8=
-github.com/ferranbt/fastssz v0.0.0-20201016163051-9c5a44b9b68d/go.mod h1:DyEu2iuLBnb/T51BlsiO3yLYdJC6UbGMrIkqK1KmQxM=
+github.com/ferranbt/fastssz v0.0.0-20201020132831-68dc48984fd3 h1:FnpkCo1TAj/eq0ETLPhAplYYB4KlFQy3kVb8cLludAc=
+github.com/ferranbt/fastssz v0.0.0-20201020132831-68dc48984fd3/go.mod h1:DyEu2iuLBnb/T51BlsiO3yLYdJC6UbGMrIkqK1KmQxM=
 github.com/franela/goblin v0.0.0-20200105215937-c9ffbefa60db/go.mod h1:7dvUGVsVBjqR7JHJk0brhHOZYGmfBYOrK0ZhYMEtBr4=
 github.com/franela/goreq v0.0.0-20171204163338-bcd34c9993f8/go.mod h1:ZhphrRTfi2rbfLwlschooIH4+wKKDR4Pdxhh+TRoA20=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
@@ -282,10 +268,6 @@ github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t
 github.com/grpc-ecosystem/grpc-gateway v1.9.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
 github.com/grpc-ecosystem/grpc-gateway v1.13.0 h1:sBDQoHXrOlfPobnKw69FIKa1wg9qsLLvvQ/Y19WtFgI=
 github.com/grpc-ecosystem/grpc-gateway v1.13.0/go.mod h1:8XEsbTttt/W+VvjtQhLACqCisSPWTxCZ7sBRjU6iH9c=
-github.com/grpc-ecosystem/grpc-gateway v1.14.7 h1:Nk5kuHrnWUTf/0GL1a/vchH/om9Ap2/HnVna+jYZgTY=
-github.com/grpc-ecosystem/grpc-gateway v1.14.7/go.mod h1:oYZKL012gGh6LMyg/xA7Q2yq6j8bu0wa+9w14EEthWU=
-github.com/grpc-ecosystem/grpc-gateway v1.15.0 h1:ntPNC9TD/6l2XDenJZe6T5lSMg95thpV9sGAqHX4WU8=
-github.com/grpc-ecosystem/grpc-gateway v1.15.0/go.mod h1:vO11I9oWA+KsxmfFQPhLnnIb1VDE24M+pdxZFiuZcA8=
 github.com/grpc-ecosystem/grpc-gateway v1.15.2 h1:HC+hWRWf+v5zTMPyoaYTKIJih+4sd4XRWmj0qlG87Co=
 github.com/grpc-ecosystem/grpc-gateway v1.15.2/go.mod h1:vO11I9oWA+KsxmfFQPhLnnIb1VDE24M+pdxZFiuZcA8=
 github.com/hashicorp/consul/api v1.1.0/go.mod h1:VmuI/Lkw1nC05EYQWNKwWGbkg+FbDBtguAZLlVdkD9Q=
@@ -314,21 +296,15 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/herumi/bls-eth-go-binary v0.0.0-20200706085701-832d8c2c0f7d h1:P8yaFmLwc5ZlUx2sHuawcdQvpv5/0GM+WEGJ07ljN3g=
 github.com/herumi/bls-eth-go-binary v0.0.0-20200706085701-832d8c2c0f7d/go.mod h1:luAnRm3OsMQeokhGzpYmc0ZKwawY7o87PUEP11Z7r7U=
-github.com/herumi/bls-eth-go-binary v0.0.0-20200722032157-41fc56eba7b4 h1:TfBVK1MJ9vhrMXWVHu5p/MlVHZTeCGgDAEu5RykVZeI=
-github.com/herumi/bls-eth-go-binary v0.0.0-20200722032157-41fc56eba7b4/go.mod h1:luAnRm3OsMQeokhGzpYmc0ZKwawY7o87PUEP11Z7r7U=
-github.com/herumi/bls-eth-go-binary v0.0.0-20200923072303-32b29e5d8cbf h1:Lw7EOMVxu3O+7Ro5bqn9M20a7GwuCqZQsmdXNzmcKE4=
-github.com/herumi/bls-eth-go-binary v0.0.0-20200923072303-32b29e5d8cbf/go.mod h1:luAnRm3OsMQeokhGzpYmc0ZKwawY7o87PUEP11Z7r7U=
 github.com/herumi/bls-eth-go-binary v0.0.0-20201008062400-71567a52ad65/go.mod h1:luAnRm3OsMQeokhGzpYmc0ZKwawY7o87PUEP11Z7r7U=
-github.com/herumi/bls-eth-go-binary v0.0.0-20201015064056-ab4d637175e8 h1:zkPatN5r+w/I0dO/ivQL3OOHEqSVqoUy2BLbF95uf40=
-github.com/herumi/bls-eth-go-binary v0.0.0-20201015064056-ab4d637175e8/go.mod h1:luAnRm3OsMQeokhGzpYmc0ZKwawY7o87PUEP11Z7r7U=
+github.com/herumi/bls-eth-go-binary v0.0.0-20201019012252-4b463a10c225 h1:S7pKW74AvYc89WawL6IxGSnJRxF4TkE1GITYqKFyYy4=
+github.com/herumi/bls-eth-go-binary v0.0.0-20201019012252-4b463a10c225/go.mod h1:luAnRm3OsMQeokhGzpYmc0ZKwawY7o87PUEP11Z7r7U=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/hudl/fargo v1.3.0/go.mod h1:y3CKSmjA+wD2gak7sUSXTAoopbhU08POFhmITJgmKTg=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
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@@ -786,17 +752,12 @@ golang.org/x/net v0.0.0-20200528225125-3c3fba18258b/go.mod h1:qpuaurCH72eLCgpAm/
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@@ -815,8 +776,8 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
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+golang.org/x/sys v0.0.0-20201024232916-9f70ab9862d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -939,15 +893,14 @@ golang.org/x/tools v0.0.0-20200729194436-6467de6f59a7 h1:LHW24ah7B+uV/OePwNP0p/t
 golang.org/x/tools v0.0.0-20200729194436-6467de6f59a7/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200804011535-6c149bb5ef0d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200825202427-b303f430e36d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
-golang.org/x/tools v0.0.0-20200828161849-5deb26317202/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200904185747-39188db58858/go.mod h1:Cj7w3i3Rnn0Xh82ur9kSqwfTHTeVxaDqrfMjpcNT6bE=
-golang.org/x/tools v0.0.0-20200915173823-2db8f0ff891c/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
 golang.org/x/tools v0.0.0-20201002184944-ecd9fd270d5d/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
-golang.org/x/tools v0.0.0-20201013201025-64a9e34f3752/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
+golang.org/x/tools v0.0.0-20201017001424-6003fad69a88/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
@@ -968,7 +921,6 @@ google.golang.org/api v0.28.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0M
 google.golang.org/api v0.29.0 h1:BaiDisFir8O4IJxvAabCGGkQ6yCJegNQqSVoYUNAnbk=
 google.golang.org/api v0.29.0/go.mod h1:Lcubydp8VUV7KeIHD9z2Bys/sm/vGKnG1UHuDBSrHWM=
 google.golang.org/api v0.30.0/go.mod h1:QGmEvQ87FHZNiUVJkT14jQNYJ4ZJjdRF23ZXz5138Fc=
-google.golang.org/api v0.31.0/go.mod h1:CL+9IBCa2WWU6gRuBWaKqGWLFFwbEUXkfeMkHLQWYWo=
 google.golang.org/api v0.32.0 h1:Le77IccnTqEa8ryp9wIpX5W3zYm7Gf9LhOp9PHcwFts=
 google.golang.org/api v0.32.0/go.mod h1:/XrVsuzM0rZmrsbjJutiuftIzeuTQcEeaYcSk/mQ1dg=
 google.golang.org/api v0.33.0 h1:+gL0XvACeMIvpwLZ5rQZzLn5cwOsgg8dIcfJ2SYfBVw=
@@ -1015,24 +967,16 @@ google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEY
 google.golang.org/genproto v0.0.0-20200528191852-705c0b31589b h1:nl5tymnV+50ACFZUDAP+xFCe3Zh3SWdMDx+ernZSKNA=
 google.golang.org/genproto v0.0.0-20200528191852-705c0b31589b/go.mod h1:jDfRM7FcilCzHH/e9qn6dsT145K34l5v+OpcnNgKAAA=
 google.golang.org/genproto v0.0.0-20200618031413-b414f8b61790/go.mod h1:jDfRM7FcilCzHH/e9qn6dsT145K34l5v+OpcnNgKAAA=
-google.golang.org/genproto v0.0.0-20200722002428-88e341933a54 h1:ASrBgpl9XvkNTP0m39/j18mid7aoF21npu2ioIBxYnY=
-google.golang.org/genproto v0.0.0-20200722002428-88e341933a54/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200729003335-053ba62fc06f/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200731012542-8145dea6a485/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200804131852-c06518451d9c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20200815001618-f69a88009b70 h1:wboULUXGF3c5qdUnKp+6gLAccE6PRpa/czkYvQ4UXv8=
-google.golang.org/genproto v0.0.0-20200815001618-f69a88009b70/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20200831141814-d751682dd103/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20200914193844-75d14daec038/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20200925023002-c2d885f95484 h1:Rr9EZdYRq2WLckzJQVtN3ISKoP7dvgwi7jbglILNZ34=
-google.golang.org/genproto v0.0.0-20200925023002-c2d885f95484/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20201002142447-3860012362da/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20201013134114-7f9ee70cb474/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20201014134559-03b6142f0dc9/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20201015140912-32ed001d685c h1:FM0/YezufKHjM3Y9gndHmhytJuCHW0bExs92Pu3LTQ0=
-google.golang.org/genproto v0.0.0-20201015140912-32ed001d685c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
+google.golang.org/genproto v0.0.0-20201019141844-1ed22bb0c154/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
+google.golang.org/genproto v0.0.0-20201022181438-0ff5f38871d5 h1:YejJbGvoWsTXHab4OKNrzk27Dr7s4lPLnewbHue1+gM=
+google.golang.org/genproto v0.0.0-20201022181438-0ff5f38871d5/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
@@ -1059,6 +1003,8 @@ google.golang.org/grpc v1.32.0 h1:zWTV+LMdc3kaiJMSTOFz2UgSBgx8RNQoTGiZu3fR9S0=
 google.golang.org/grpc v1.32.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.33.0 h1:IBKSUNL2uBS2DkJBncPP+TwT0sp9tgA8A75NjHt6umg=
 google.golang.org/grpc v1.33.0/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
+google.golang.org/grpc v1.33.1 h1:DGeFlSan2f+WEtCERJ4J9GJWk15TxUi8QGagfI87Xyc=
+google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -1082,10 +1028,6 @@ gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMy
 gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
 gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/ini.v1 v1.60.0 h1:P5ZzC7RJO04094NJYlEnBdFK2wwmnCAy/+7sAzvWs60=
-gopkg.in/ini.v1 v1.60.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/ini.v1 v1.61.0 h1:LBCdW4FmFYL4s/vDZD1RQYX7oAR6IjujCYgMdbHBR10=
-gopkg.in/ini.v1 v1.61.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
 gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/jcmturner/gokrb5.v7 v7.5.0/go.mod h1:l8VISx+WGYp+Fp7KRbsiUuXTTOnxIc3Tuvyavf11/WM=

services/accountmanager/dirk/validatingaccount.go

@@ -19,6 +19,7 @@ import (
 
 	eth2client "github.com/attestantio/go-eth2-client"
 	api "github.com/attestantio/go-eth2-client/api/v1"
+	"github.com/attestantio/vouch/services/accountmanager"
 	"github.com/opentracing/opentracing-go"
 	"github.com/pkg/errors"
 	e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
@@ -164,6 +165,53 @@ func (d *ValidatingAccount) SignBeaconAttestation(ctx context.Context,
 	return sig.Marshal(), nil
 }
 
+// SignBeaconAttestations signs multiple beacon attestations.
+func (d *ValidatingAccount) SignBeaconAttestations(ctx context.Context,
+	slot uint64,
+	accounts []accountmanager.ValidatingAccount,
+	committeeIndices []uint64,
+	blockRoot []byte,
+	sourceEpoch uint64,
+	sourceRoot []byte,
+	targetEpoch uint64,
+	targetRoot []byte) ([][]byte, error) {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "dirk.SignBeaconAttestations")
+	defer span.Finish()
+
+	signatureDomain, err := d.signatureDomainProvider.SignatureDomain(ctx,
+		d.accountManager.beaconAttesterDomain,
+		slot/d.accountManager.slotsPerEpoch)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to obtain signature domain for beacon attestation")
+	}
+
+	e2Accounts := make([]e2wtypes.Account, len(accounts))
+	for i := range accounts {
+		e2Accounts[i] = accounts[i].(*ValidatingAccount).account
+	}
+	sigs, err := d.account.(e2wtypes.AccountProtectingMultiSigner).SignBeaconAttestations(ctx,
+		slot,
+		e2Accounts,
+		committeeIndices,
+		blockRoot,
+		sourceEpoch,
+		sourceRoot,
+		targetEpoch,
+		targetRoot,
+		signatureDomain)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to sign beacon attestation")
+	}
+
+	res := make([][]byte, len(sigs))
+	for i := range sigs {
+		if sigs[i] != nil {
+			res[i] = sigs[i].Marshal()
+		}
+	}
+	return res, nil
+}
+
 // SignAggregateAndProof signs an aggregate and proof item.
 func (d *ValidatingAccount) SignAggregateAndProof(ctx context.Context, slot uint64, aggregateAndProofRoot []byte) ([]byte, error) {
 	span, ctx := opentracing.StartSpanFromContext(ctx, "dirk.SignAggregateAndProof")

services/accountmanager/service.go

@@ -116,6 +116,20 @@ type BeaconAttestationSigner interface {
 		targetRoot []byte) ([]byte, error)
 }
 
+// BeaconAttestationsSigner provides methods to sign multiple beacon attestations.
+type BeaconAttestationsSigner interface {
+	// SignBeaconAttestation signs multiple beacon attestations.
+	SignBeaconAttestations(ctx context.Context,
+		slot uint64,
+		accounts []ValidatingAccount,
+		committeeIndices []uint64,
+		blockRoot []byte,
+		sourceEpoch uint64,
+		sourceRoot []byte,
+		targetEpoch uint64,
+		targetRoot []byte) ([][]byte, error)
+}
+
 // AggregateAndProofSigner provides methods to sign aggregate and proofs.
 type AggregateAndProofSigner interface {
 	// SignAggregateAndProof signs an aggregate attestation for given slot and root.

services/attester/helpers.go

@@ -22,6 +22,7 @@ import (
 
 // MergeDuties merges attester duties given by an Ethereum 2 client into vouch's per-slot structure.
 func MergeDuties(ctx context.Context, attesterDuties []*api.AttesterDuty) ([]*Duty, error) {
+	committeesAtSlot := make(map[uint64]uint64)
 	validatorIndices := make(map[uint64][]uint64)
 	committeeIndices := make(map[uint64][]uint64)
 	validatorCommitteeIndices := make(map[uint64][]uint64)
@@ -60,6 +61,7 @@ func MergeDuties(ctx context.Context, attesterDuties []*api.AttesterDuty) ([]*Du
 			committeeIndices[duty.Slot] = make([]uint64, 0, arrayCap)
 			committeeLengths[duty.Slot] = make(map[uint64]uint64)
 		}
+		committeesAtSlot[duty.Slot] = duty.CommitteesAtSlot
 		validatorIndices[duty.Slot] = append(validatorIndices[duty.Slot], duty.ValidatorIndex)
 		committeeIndices[duty.Slot] = append(committeeIndices[duty.Slot], duty.CommitteeIndex)
 		committeeLengths[duty.Slot][duty.CommitteeIndex] = duty.CommitteeLength
@@ -71,6 +73,7 @@ func MergeDuties(ctx context.Context, attesterDuties []*api.AttesterDuty) ([]*Du
 		if duty, err := NewDuty(
 			ctx,
 			slot,
+			committeesAtSlot[slot],
 			validatorIndices[slot],
 			committeeIndices[slot],
 			validatorCommitteeIndices[slot],

services/attester/service.go

@@ -20,9 +20,10 @@ import (
 	spec "github.com/attestantio/go-eth2-client/spec/phase0"
 )
 
-// Duty contains information about a beacon block attester duty.
+// Duty contains information about beacon block attester duties for a given slot.
 type Duty struct {
 	slot                      uint64
+	committeesAtSlot          uint64
 	validatorIndices          []uint64
 	committeeIndices          []uint64
 	validatorCommitteeIndices []uint64
@@ -30,7 +31,7 @@ type Duty struct {
 }
 
 // NewDuty creates a new beacon block attester duty.
-func NewDuty(ctx context.Context, slot uint64, validatorIndices []uint64, committeeIndices []uint64, validatorCommitteeIndices []uint64, committeeLengths map[uint64]uint64) (*Duty, error) {
+func NewDuty(ctx context.Context, slot uint64, committeesAtSlot uint64, validatorIndices []uint64, committeeIndices []uint64, validatorCommitteeIndices []uint64, committeeLengths map[uint64]uint64) (*Duty, error) {
 	// Ensure there is a matching committee size for each committee index.
 	for i := range committeeIndices {
 		if _, exists := committeeLengths[committeeIndices[i]]; !exists {
@@ -40,6 +41,7 @@ func NewDuty(ctx context.Context, slot uint64, validatorIndices []uint64, commit
 
 	return &Duty{
 		slot:                      slot,
+		committeesAtSlot:          committeesAtSlot,
 		validatorIndices:          validatorIndices,
 		committeeIndices:          committeeIndices,
 		validatorCommitteeIndices: validatorCommitteeIndices,
@@ -52,6 +54,11 @@ func (d *Duty) Slot() uint64 {
 	return d.slot
 }
 
+// CommitteesAtSlot provides the number of committees at the slot for the beacon block attester.
+func (d *Duty) CommitteesAtSlot() uint64 {
+	return d.committeesAtSlot
+}
+
 // ValidatorIndices provides the validator indices for the beacon block attester.
 func (d *Duty) ValidatorIndices() []uint64 {
 	return d.validatorIndices

services/attester/standard/service.go

@@ -25,11 +25,11 @@ import (
 	"github.com/attestantio/vouch/services/attester"
 	"github.com/attestantio/vouch/services/metrics"
 	"github.com/attestantio/vouch/services/submitter"
+	"github.com/attestantio/vouch/util"
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/rs/zerolog"
 	zerologger "github.com/rs/zerolog/log"
-	"golang.org/x/sync/semaphore"
 )
 
 // Service is a beacon block attester.
@@ -88,9 +88,6 @@ func (s *Service) Attest(ctx context.Context, data interface{}) ([]*spec.Attesta
 	log := log.With().Uint64("slot", duty.Slot()).Logger()
 	log.Trace().Uints64("validator_indices", duty.ValidatorIndices()).Msg("Attesting")
 
-	attestations := make([]*spec.Attestation, 0, len(duty.ValidatorIndices()))
-	var attestationsMutex sync.Mutex
-
 	// Fetch the attestation data.
 	attestationData, err := s.attestationDataProvider.AttestationData(ctx, duty.Slot(), duty.CommitteeIndices()[0])
 	if err != nil {
@@ -103,6 +100,14 @@ func (s *Service) Attest(ctx context.Context, data interface{}) ([]*spec.Attesta
 		s.monitor.AttestationCompleted(started, "failed")
 		return nil, fmt.Errorf("attestation request for slot %d returned data for slot %d", duty.Slot(), attestationData.Slot)
 	}
+	if attestationData.Source.Epoch > attestationData.Target.Epoch {
+		s.monitor.AttestationCompleted(started, "failed")
+		return nil, fmt.Errorf("attestation request for slot %d returned source epoch %d greater than target epoch %d", duty.Slot(), attestationData.Source.Epoch, attestationData.Target.Epoch)
+	}
+	if attestationData.Target.Epoch > duty.Slot()/s.slotsPerEpoch {
+		s.monitor.AttestationCompleted(started, "failed")
+		return nil, fmt.Errorf("attestation request for slot %d returned target epoch %d greater than current epoch %d", duty.Slot(), attestationData.Target.Epoch, duty.Slot()/s.slotsPerEpoch)
+	}
 
 	// Fetch the validating accounts.
 	accounts, err := s.validatingAccountsProvider.AccountsByIndex(ctx, duty.ValidatorIndices())
@@ -112,105 +117,115 @@ func (s *Service) Attest(ctx context.Context, data interface{}) ([]*spec.Attesta
 	}
 	log.Trace().Dur("elapsed", time.Since(started)).Uints64("validator_indices", duty.ValidatorIndices()).Msg("Obtained validating accounts")
 
-	// Run the attestations in parallel, up to a concurrency limit.
+	// Set the per-validator information.
 	validatorIndexToArrayIndexMap := make(map[uint64]int)
 	for i := range duty.ValidatorIndices() {
 		validatorIndexToArrayIndexMap[duty.ValidatorIndices()[i]] = i
 	}
-	sem := semaphore.NewWeighted(s.processConcurrency)
-	var wg sync.WaitGroup
-	for _, account := range accounts {
-		wg.Add(1)
-		go func(sem *semaphore.Weighted, wg *sync.WaitGroup, account accountmanager.ValidatingAccount, attestations *[]*spec.Attestation, attestationsMutex *sync.Mutex) {
-			defer wg.Done()
-			if err := sem.Acquire(ctx, 1); err != nil {
-				log.Error().Err(err).Msg("Failed to acquire semaphore")
-				return
-			}
-			defer sem.Release(1)
-
-			validatorIndex, err := account.Index(ctx)
-			if err != nil {
-				log.Warn().Err(err).Msg("Failed to obtain validator index")
-				return
-			}
-			log := log.With().Uint64("validator_index", validatorIndex).Logger()
-			attestation, err := s.attest(ctx,
-				duty.Slot(),
-				duty.CommitteeIndices()[validatorIndexToArrayIndexMap[validatorIndex]],
-				duty.ValidatorCommitteeIndices()[validatorIndexToArrayIndexMap[validatorIndex]],
-				duty.CommitteeSize(duty.CommitteeIndices()[validatorIndexToArrayIndexMap[validatorIndex]]),
-				account,
-				attestationData,
-			)
-			if err != nil {
-				log.Warn().Err(err).Msg("Failed to attest")
-				s.monitor.AttestationCompleted(started, "failed")
-				return
-			}
-			log.Trace().Dur("elapsed", time.Since(started)).Msg("Attested")
-			s.monitor.AttestationCompleted(started, "succeeded")
-			attestationsMutex.Lock()
-			*attestations = append(*attestations, attestation)
-			attestationsMutex.Unlock()
-
-		}(sem, &wg, account, &attestations, &attestationsMutex)
+	committeeIndices := make([]uint64, len(accounts))
+	validatorCommitteeIndices := make([]uint64, len(accounts))
+	committeeSizes := make([]uint64, len(accounts))
+	for i := range accounts {
+		validatorIndex, err := accounts[i].Index(ctx)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to obtain validator index")
+		}
+		committeeIndices[i] = duty.CommitteeIndices()[validatorIndexToArrayIndexMap[validatorIndex]]
+		validatorCommitteeIndices[i] = duty.ValidatorCommitteeIndices()[validatorIndexToArrayIndexMap[validatorIndex]]
+		committeeSizes[i] = duty.CommitteeSize(committeeIndices[i])
+	}
+
+	attestations, err := s.attest(ctx,
+		duty,
+		accounts,
+		committeeIndices,
+		validatorCommitteeIndices,
+		committeeSizes,
+		attestationData,
+		started,
+	)
+	if err != nil {
+		log.Error().Err(err).Msg("Failed to attest")
 	}
-	wg.Wait()
 
 	return attestations, nil
 }
 
 func (s *Service) attest(
 	ctx context.Context,
-	slot uint64,
-	committeeIndex uint64,
-	validatorCommitteeIndex uint64,
-	committeeSize uint64,
-	account accountmanager.ValidatingAccount,
-	attestationData *spec.AttestationData,
-) (*spec.Attestation, error) {
-
-	// Sign the attestation.
-	signer, isSigner := account.(accountmanager.BeaconAttestationSigner)
+	duty *attester.Duty,
+	accounts []accountmanager.ValidatingAccount,
+	committeeIndices []uint64,
+	validatorCommitteeIndices []uint64,
+	committeeSizes []uint64,
+	data *spec.AttestationData,
+	started time.Time,
+) ([]*spec.Attestation, error) {
+	// Multisign the attestation for all validating accounts.
+	signer, isSigner := accounts[0].(accountmanager.BeaconAttestationsSigner)
 	if !isSigner {
-		return nil, errors.New("account is not a beacon attestation signer")
+		return nil, errors.New("account is not a beacon attestations signer")
 	}
-	sig, err := signer.SignBeaconAttestation(ctx,
-		slot,
-		committeeIndex,
-		attestationData.BeaconBlockRoot,
-		attestationData.Source.Epoch,
-		attestationData.Source.Root,
-		attestationData.Target.Epoch,
-		attestationData.Target.Root)
+	sigs, err := signer.SignBeaconAttestations(ctx,
+		duty.Slot(),
+		accounts,
+		committeeIndices,
+		data.BeaconBlockRoot,
+		data.Source.Epoch,
+		data.Source.Root,
+		data.Target.Epoch,
+		data.Target.Root)
 	if err != nil {
-		return nil, errors.Wrap(err, "failed to sign beacon attestation")
+		return nil, errors.Wrap(err, "failed to sign beacon attestations")
 	}
 	log.Trace().Msg("Signed")
 
-	// Submit the attestation.
-	aggregationBits := bitfield.NewBitlist(committeeSize)
-	aggregationBits.SetBitAt(validatorCommitteeIndex, true)
-	attestation := &spec.Attestation{
-		AggregationBits: aggregationBits,
-		Data: &spec.AttestationData{
-			Slot:            slot,
-			Index:           committeeIndex,
-			BeaconBlockRoot: attestationData.BeaconBlockRoot,
-			Source: &spec.Checkpoint{
-				Epoch: attestationData.Source.Epoch,
-				Root:  attestationData.Source.Root,
-			},
-			Target: &spec.Checkpoint{
-				Epoch: attestationData.Target.Epoch,
-				Root:  attestationData.Target.Root,
-			},
-		},
-		Signature: sig,
+	// Submit the attestations.
+	attestations := make([]*spec.Attestation, len(sigs))
+	_, err = util.Scatter(len(sigs), func(offset int, entries int, _ *sync.RWMutex) (interface{}, error) {
+		for i := offset; i < offset+entries; i++ {
+			validatorIndex, err := accounts[i].Index(ctx)
+			if err != nil {
+				log.Warn().Err(err).Msg("failed to obtain validator index")
+				continue
+			}
+			log := log.With().Uint64("slot", duty.Slot()).Uint64("validator_index", validatorIndex).Logger()
+			if sigs[i] == nil {
+				log.Warn().Msg("No signature for validator; not creating attestation")
+				continue
+			}
+
+			aggregationBits := bitfield.NewBitlist(committeeSizes[i])
+			aggregationBits.SetBitAt(validatorCommitteeIndices[i], true)
+			attestation := &spec.Attestation{
+				AggregationBits: aggregationBits,
+				Data: &spec.AttestationData{
+					Slot:            duty.Slot(),
+					Index:           committeeIndices[i],
+					BeaconBlockRoot: data.BeaconBlockRoot,
+					Source: &spec.Checkpoint{
+						Epoch: data.Source.Epoch,
+						Root:  data.Source.Root,
+					},
+					Target: &spec.Checkpoint{
+						Epoch: data.Target.Epoch,
+						Root:  data.Target.Root,
+					},
+				},
+				Signature: sigs[i],
+			}
+			if err := s.attestationSubmitter.SubmitAttestation(ctx, attestation); err != nil {
+				log.Warn().Err(err).Msg("Failed to submit attestation")
+				continue
+			}
+			attestations[i] = attestation
+			s.monitor.AttestationCompleted(started, "succeeded")
+		}
+		return nil, nil
+	})
+	if err != nil {
+		log.Error().Err(err).Msg("Failed to scatter submit")
 	}
-	if err := s.attestationSubmitter.SubmitAttestation(ctx, attestation); err != nil {
-		return nil, errors.Wrap(err, "failed to submit attestation")
-	}
-	return attestation, nil
+
+	return attestations, nil
 }

util/scatter.go

@@ -0,0 +1,97 @@
+// Copyright © 2020 Attestant Limited.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util
+
+import (
+	"errors"
+	"runtime"
+	"sync"
+)
+
+// ScatterResult is the result of a single scatter worker.
+type ScatterResult struct {
+	// Offset is the offset at which the worker started.
+	Offset int
+	// Extent is the user-defined result of running the scatter function.
+	Extent interface{}
+}
+
+// Scatter scatters a computation across multiple goroutines, returning a set of per-worker results
+func Scatter(inputLen int, work func(int, int, *sync.RWMutex) (interface{}, error)) ([]*ScatterResult, error) {
+	if inputLen <= 0 {
+		return nil, errors.New("no data with which to work")
+	}
+
+	extentSize := calculateExtentSize(inputLen)
+	workers := inputLen / extentSize
+	if inputLen%extentSize != 0 {
+		workers++
+	}
+
+	resultCh := make(chan *ScatterResult, workers)
+	defer close(resultCh)
+	errorCh := make(chan error, workers)
+	defer close(errorCh)
+	mutex := new(sync.RWMutex)
+	for worker := 0; worker < workers; worker++ {
+		offset := worker * extentSize
+		entries := extentSize
+		if offset+entries > inputLen {
+			entries = inputLen - offset
+		}
+		go func(offset int, entries int) {
+			extent, err := work(offset, entries, mutex)
+			if err != nil {
+				errorCh <- err
+			} else {
+				resultCh <- &ScatterResult{
+					Offset: offset,
+					Extent: extent,
+				}
+			}
+		}(offset, entries)
+	}
+
+	// Collect results from workers
+	results := make([]*ScatterResult, workers)
+	var err error
+	for i := 0; i < workers; i++ {
+		select {
+		case result := <-resultCh:
+			results[i] = result
+		case err = <-errorCh:
+			// Error occurred; don't return because that closes the channels
+			// and can cause other workers to write to the closed channel.
+		}
+	}
+	return results, err
+}
+
+// calculateExtentSize calculates the extent size given the number of items and maximum processors available.
+func calculateExtentSize(items int) int {
+	// Start with an even split.
+	extentSize := items / runtime.GOMAXPROCS(0)
+
+	if extentSize == 0 {
+		// We must have an extent size of at least 1.
+		return 1
+	}
+
+	if items%extentSize > 0 {
+		// We have a remainder; add one to the extent size to ensure we capture it.
+		extentSize++
+	}
+
+	return extentSize
+}

util/scatter_benchmark_test.go

@@ -0,0 +1,76 @@
+// Copyright © 2020 Attestant Limited.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util_test
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"sync"
+	"testing"
+
+	"github.com/attestantio/dirk/util"
+	log "github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/require"
+)
+
+var input [][]byte
+
+const (
+	benchmarkElements    = 65536
+	benchmarkElementSize = 32
+	benchmarkHashRuns    = 128
+)
+
+func init() {
+	input = make([][]byte, benchmarkElements)
+	for i := 0; i < benchmarkElements; i++ {
+		input[i] = make([]byte, benchmarkElementSize)
+		_, err := rand.Read(input[i])
+		if err != nil {
+			log.WithError(err).Debug("Cannot read from rand")
+		}
+	}
+}
+
+// hash is a simple worker function that carries out repeated hashging of its input to provide an output.
+func hash(input [][]byte) [][]byte {
+	output := make([][]byte, len(input))
+	for i := range input {
+		copy(output, input)
+		for j := 0; j < benchmarkHashRuns; j++ {
+			hash := sha256.Sum256(output[i])
+			output[i] = hash[:]
+		}
+	}
+	return output
+}
+
+func BenchmarkHash(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		hash(input)
+	}
+}
+
+func BenchmarkHashMP(b *testing.B) {
+	output := make([][]byte, len(input))
+	for i := 0; i < b.N; i++ {
+		workerResults, err := util.Scatter(len(input), func(offset int, entries int, _ *sync.RWMutex) (interface{}, error) {
+			return hash(input[offset : offset+entries]), nil
+		})
+		require.NoError(b, err)
+		for _, result := range workerResults {
+			copy(output[result.Offset:], result.Extent.([][]byte))
+		}
+	}
+}

util/scatter_test.go

@@ -0,0 +1,116 @@
+// Copyright © 2020 Attestant Limited.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util_test
+
+import (
+	"errors"
+	"sync"
+	"testing"
+
+	"github.com/attestantio/dirk/util"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDouble(t *testing.T) {
+	tests := []struct {
+		name     string
+		inValues int
+		err      string
+	}{
+		{
+			name:     "0",
+			inValues: 0,
+			err:      "no data with which to work",
+		},
+		{
+			name:     "1",
+			inValues: 1,
+		},
+		{
+			name:     "1023",
+			inValues: 1023,
+		},
+		{
+			name:     "1024",
+			inValues: 1024,
+		},
+		{
+			name:     "1025",
+			inValues: 1025,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			inValues := make([]int, test.inValues)
+			for i := 0; i < test.inValues; i++ {
+				inValues[i] = i
+			}
+			outValues := make([]int, test.inValues)
+			workerResults, err := util.Scatter(len(inValues), func(offset int, entries int, _ *sync.RWMutex) (interface{}, error) {
+				extent := make([]int, entries)
+				for i := 0; i < entries; i++ {
+					extent[i] = inValues[offset+i] * 2
+				}
+				return extent, nil
+			})
+			if test.err != "" {
+				assert.Equal(t, test.err, err.Error())
+			} else {
+				require.NoError(t, err)
+				for _, result := range workerResults {
+					copy(outValues[result.Offset:], result.Extent.([]int))
+				}
+
+				for i := 0; i < test.inValues; i++ {
+					require.Equal(t, inValues[i]*2, outValues[i], "Outvalue at %d incorrect", i)
+				}
+			}
+		})
+	}
+}
+
+func TestMutex(t *testing.T) {
+	totalRuns := 1048576
+	val := 0
+	_, err := util.Scatter(totalRuns, func(offset int, entries int, mu *sync.RWMutex) (interface{}, error) {
+		for i := 0; i < entries; i++ {
+			mu.Lock()
+			val++
+			mu.Unlock()
+		}
+		return nil, nil
+	})
+	require.NoError(t, err)
+	require.Equal(t, totalRuns, val)
+}
+
+func TestError(t *testing.T) {
+	totalRuns := 1024
+	val := 0
+	_, err := util.Scatter(totalRuns, func(offset int, entries int, mu *sync.RWMutex) (interface{}, error) {
+		for i := 0; i < entries; i++ {
+			mu.Lock()
+			val++
+			if val == 1011 {
+				mu.Unlock()
+				return nil, errors.New("bad number")
+			}
+			mu.Unlock()
+		}
+		return nil, nil
+	})
+	require.EqualError(t, err, "bad number")
+}