Events Tracking / Tendermint v0.32.0 Update

go.mod

@@ -9,39 +9,31 @@ require (
 	github.com/cosmos/ledger-cosmos-go v0.10.3
 	github.com/fortytw2/leaktest v1.3.0 // indirect
 	github.com/go-logfmt/logfmt v0.4.0 // indirect
-	github.com/gogo/protobuf v1.1.1
+	github.com/gogo/protobuf v1.2.1
 	github.com/golang/protobuf v1.3.0
 	github.com/golang/snappy v0.0.1 // indirect
 	github.com/gorilla/mux v1.7.0
 	github.com/gorilla/websocket v1.4.0 // indirect
-	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/jmhodges/levigo v1.0.0 // indirect
-	github.com/magiconair/properties v1.8.0 // indirect
 	github.com/mattn/go-isatty v0.0.6
-	github.com/mitchellh/mapstructure v1.1.2 // indirect
 	github.com/pelletier/go-toml v1.2.0
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v0.9.2 // indirect
 	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 // indirect
 	github.com/prometheus/common v0.2.0 // indirect
 	github.com/prometheus/procfs v0.0.0-20190227231451-bbced9601137 // indirect
 	github.com/rakyll/statik v0.1.4
-	github.com/rcrowley/go-metrics v0.0.0-20180503174638-e2704e165165 // indirect
-	github.com/rs/cors v1.6.0 // indirect
 	github.com/spf13/afero v1.2.1 // indirect
-	github.com/spf13/cast v1.3.0 // indirect
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.3
 	github.com/spf13/viper v1.0.3
 	github.com/stretchr/testify v1.3.0
-	github.com/syndtr/goleveldb v0.0.0-20180708030551-c4c61651e9e3 // indirect
 	github.com/tendermint/btcd v0.1.1
 	github.com/tendermint/go-amino v0.15.0
 	github.com/tendermint/iavl v0.12.2
-	github.com/tendermint/tendermint v0.31.5
-	golang.org/x/crypto v0.0.0-20180904163835-0709b304e793
+	github.com/tendermint/tendermint v0.32.0-dev0
+	go.etcd.io/bbolt v1.3.3 // indirect
+	golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25
 	google.golang.org/grpc v1.19.0 // indirect
 	gopkg.in/yaml.v2 v2.2.2
 )

go.sum

@@ -34,10 +34,14 @@ github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495/go.mod h1:J7Y8YcW2
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/etcd-io/bbolt v1.3.2 h1:RLRQ0TKLX7DlBRXAJHvbmXL17Q3KNnTBtZ9B6Qo+/Y0=
+github.com/etcd-io/bbolt v1.3.2/go.mod h1:ZF2nL25h33cCyBtcyWeZ2/I3HQOfTP+0PIEvHjkjCrw=
+github.com/fortytw2/leaktest v1.2.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
 github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/go-kit/kit v0.6.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/kit v0.8.0 h1:Wz+5lgoB0kkuqLEc6NVmwRknTKP6dTGbSqvhZtBI/j0=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
@@ -47,19 +51,23 @@ github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gogo/protobuf v1.1.1 h1:72R+M5VuhED/KujmZVcIquuo8mBgX4oVda//DQb3PXo=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
+github.com/gogo/protobuf v1.2.1 h1:/s5zKNz0uPFCZ5hddgPdo2TK2TVrUNMn0OOX8/aZMTE=
+github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.0 h1:kbxbvI4Un1LUWKxufD+BiE6AEExYYgkQLQmLFqA1LFk=
 github.com/golang/protobuf v1.3.0/go.mod h1:Qd/q+1AKNOZr9uGQzbzCmRO6sUih6GTPZv6a1/R87v0=
+github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf h1:+RRA9JqSOZFfKrOeqr2z77+8R2RKyh8PG66dcu1V0ck=
 github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=
 github.com/gorilla/mux v1.7.0 h1:tOSd0UKHQd6urX6ApfOn4XdBMY6Sh1MfxV3kmaazO+U=
 github.com/gorilla/mux v1.7.0/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/gorilla/websocket v1.2.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/gorilla/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
 github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
@@ -74,6 +82,8 @@ github.com/jmhodges/levigo v1.0.0 h1:q5EC36kV79HWeTBWsod3mG11EgStG3qArTKcvlksN1U
 github.com/jmhodges/levigo v1.0.0/go.mod h1:Q6Qx+uH3RAqyK4rFQroq9RL7mdkABMcfhEI+nNuzMJQ=
 github.com/jrick/logrotate v1.0.0/go.mod h1:LNinyqDIJnpAur+b8yyulnQw/wDuN1+BYKlTRt3OuAQ=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
+github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515 h1:T+h1c/A9Gawja4Y9mFVWj2vyii2bbUNDw3kt9VxK2EY=
@@ -106,6 +116,7 @@ github.com/prometheus/client_golang v0.9.2/go.mod h1:OsXs2jCmiKlQ1lTBmv21f2mNfw4
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 h1:S/YWwWx/RA8rT8tKFRuGUZhuA90OyIBpPCXkcbwU8DE=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/prometheus/common v0.0.0-20181020173914-7e9e6cabbd39/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
 github.com/prometheus/common v0.0.0-20181126121408-4724e9255275/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
 github.com/prometheus/common v0.2.0 h1:kUZDBDTdBVBYBj5Tmh2NZLlF60mfjA27rM34b+cVwNU=
 github.com/prometheus/common v0.2.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
@@ -120,16 +131,20 @@ github.com/rcrowley/go-metrics v0.0.0-20180503174638-e2704e165165/go.mod h1:bCqn
 github.com/rs/cors v1.6.0 h1:G9tHG9lebljV9mfp9SNPDL36nCDxmo3zTlAf1YgvzmI=
 github.com/rs/cors v1.6.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
+github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
 github.com/spf13/afero v1.2.1 h1:qgMbHoJbPbw579P+1zVY+6n4nIFuIchaIjzZ/I/Yq8M=
 github.com/spf13/afero v1.2.1/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
 github.com/spf13/cast v1.3.0 h1:oget//CVOEoFewqQxwr0Ej5yjygnqGkvggSE/gB35Q8=
 github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
+github.com/spf13/cobra v0.0.1/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
+github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
 github.com/spf13/jwalterweatherman v1.1.0 h1:ue6voC5bR5F8YxI5S67j9i582FU4Qvo2bmqnqMYADFk=
 github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/spf13/viper v1.0.0/go.mod h1:A8kyI5cUJhb8N+3pkfONlcEcZbueH6nhAm0Fq7SrnBM=
 github.com/spf13/viper v1.0.3 h1:z5LPUc2iz8VLT5Cw1UyrESG6FUUnOGecYGY08BLKSuc=
 github.com/spf13/viper v1.0.3/go.mod h1:A8kyI5cUJhb8N+3pkfONlcEcZbueH6nhAm0Fq7SrnBM=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -138,20 +153,23 @@ github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/syndtr/goleveldb v0.0.0-20180708030551-c4c61651e9e3 h1:sAlSBRDl4psFR3ysKXRSE8ss6Mt90+ma1zRTroTNBJA=
-github.com/syndtr/goleveldb v0.0.0-20180708030551-c4c61651e9e3/go.mod h1:Z4AUp2Km+PwemOoO/VB5AOx9XSsIItzFjoJlOSiYmn0=
+github.com/syndtr/goleveldb v0.0.0-20181012014443-6b91fda63f2e h1:91EeXI4y4ShkyzkMqZ7QP/ZTIqwXp3RuDu5WFzxcFAs=
+github.com/syndtr/goleveldb v0.0.0-20181012014443-6b91fda63f2e/go.mod h1:Z4AUp2Km+PwemOoO/VB5AOx9XSsIItzFjoJlOSiYmn0=
 github.com/tendermint/btcd v0.1.1 h1:0VcxPfflS2zZ3RiOAHkBiFUcPvbtRj5O7zHmcJWHV7s=
 github.com/tendermint/btcd v0.1.1/go.mod h1:DC6/m53jtQzr/NFmMNEu0rxf18/ktVoVtMrnDD5pN+U=
 github.com/tendermint/crypto v0.0.0-20180820045704-3764759f34a5 h1:u8i49c+BxloX3XQ55cvzFNXplizZP/q00i+IlttUjAU=
 github.com/tendermint/crypto v0.0.0-20180820045704-3764759f34a5/go.mod h1:z4YtwM70uOnk8h0pjJYlj3zdYwi9l03By6iAIF5j/Pk=
+github.com/tendermint/go-amino v0.14.1/go.mod h1:i/UKE5Uocn+argJJBb12qTZsCDBcAYMbR92AaJVmKso=
 github.com/tendermint/go-amino v0.15.0 h1:TC4e66P59W7ML9+bxio17CPKnxW3nKIRAYskntMAoRk=
 github.com/tendermint/go-amino v0.15.0/go.mod h1:TQU0M1i/ImAo+tYpZi73AU3V/dKeCoMC9Sphe2ZwGME=
 github.com/tendermint/iavl v0.12.2 h1:Ls5p5VINCM1HRT9g5Vvs2zmDOCU/CCIvIHzd/pZ8P0E=
 github.com/tendermint/iavl v0.12.2/go.mod h1:EoKMMv++tDOL5qKKVnoIqtVPshRrEPeJ0WsgDOLAauM=
-github.com/tendermint/tendermint v0.31.5 h1:vTet8tCq3B9/J9Yo11dNZ8pOB7NtSy++bVSfkP4KzR4=
-github.com/tendermint/tendermint v0.31.5/go.mod h1:ymcPyWblXCplCPQjbOYbrF1fWnpslATMVqiGgWbZrlc=
+github.com/tendermint/tendermint v0.32.0-dev0 h1:/LGvt1VyRwM9IY1MuHlRM+/uP6i+TjYTczY6o/0/EEs=
+github.com/tendermint/tendermint v0.32.0-dev0/go.mod h1:gmUQxIhqaKyt51CkAIadahUVDVwQpFMKPJT64Q1qtuA=
 github.com/zondax/hid v0.9.0 h1:eiT3P6vNxAEVxXMw66eZUAAnU2zD33JBkfG/EnfAKl8=
 github.com/zondax/hid v0.9.0/go.mod h1:l5wttcP0jwtdLjqjMMWFVEE7d1zO0jvSPA9OPZxWpEM=
+go.etcd.io/bbolt v1.3.3 h1:MUGmc65QhB3pIlaQ5bB4LwqSj6GIonVJXpZiaKNyaKk=
+go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -169,17 +187,22 @@ golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223 h1:DH4skfRX4EBpamg7iV4ZlCpblAHI6s6TDM39bFZumv8=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
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types/events.go

@@ -0,0 +1,145 @@
+package types
+
+import (
+	"fmt"
+	"strings"
+
+	abci "github.com/tendermint/tendermint/abci/types"
+	cmn "github.com/tendermint/tendermint/libs/common"
+)
+
+type (
+	// Event is a type alias for an ABCI Event
+	Event abci.Event
+
+	// Attribute defines an attribute wrapper where the key and value are
+	// strings instead of raw bytes.
+	Attribute struct {
+		Key   string `json:"key"`
+		Value string `json:"value,omitempty"`
+	}
+
+	// Events defines a slice of Event objects
+	Events []Event
+)
+
+// NewEvent creates a new Event object with a given type and slice of one or more
+// attributes.
+func NewEvent(ty string, attrs ...Attribute) Event {
+	e := Event{Type: ty}
+
+	for _, attr := range attrs {
+		e.Attributes = append(e.Attributes, cmn.KVPair{Key: toBytes(attr.Key), Value: toBytes(attr.Value)})
+	}
+
+	return e
+}
+
+// NewAttribute returns a Tendermint key/value pair given a key and a value as
+// strings.
+func NewAttribute(k, v string) cmn.KVPair {
+	return cmn.KVPair{Key: toBytes(k), Value: toBytes(v)}
+}
+
+// EmptyEvents returns an empty slice of events.
+func EmptyEvents() Events {
+	return make(Events, 0)
+}
+
+func (sa Attribute) String() string {
+	return fmt.Sprintf("%s: %s", sa.Key, sa.Value)
+}
+
+// AppendAttributes adds one or more attributes to an Event.
+func (e Event) AppendAttributes(attrs ...cmn.KVPair) Event {
+	e.Attributes = append(e.Attributes, attrs...)
+	return e
+}
+
+// AppendEvent adds an Event to a slice of events.
+func (e Events) AppendEvent(ty string, attrs ...Attribute) Events {
+	return append(e, NewEvent(ty, attrs...))
+}
+
+// AppendEvents adds a slice of Event objects to an exist slice of Event objects.
+func (e Events) AppendEvents(events Events) Events {
+	return append(e, events...)
+}
+
+func toBytes(i interface{}) []byte {
+	switch x := i.(type) {
+	case []uint8:
+		return x
+	case string:
+		return []byte(x)
+	default:
+		panic(i)
+	}
+}
+
+// ----------------------------------------------------------------------------
+
+// common tags
+// TODO: ....
+var (
+	Action          = "action"
+	TagCategory     = "category"
+	TagSender       = "sender"
+	TagSrcValidator = "source-validator"
+	TagDstValidator = "destination-validator"
+	TagDelegator    = "delegator"
+)
+
+type (
+	// StringAttribute defines en Event object wrapper where all the attributes
+	// contain key/value pairs that are strings instead of raw bytes.
+	StringEvent struct {
+		Event
+		// override attributes
+		Attributes []Attribute `json:"attributes,omitempty"`
+	}
+
+	// StringAttributes defines a slice of StringEvents objects.
+	StringEvents []StringEvent
+)
+
+func (se StringEvents) String() string {
+	var sb strings.Builder
+
+	for _, e := range se {
+		sb.WriteString(fmt.Sprintf("\t\t- %s\n", e.Type))
+
+		for _, attr := range e.Attributes {
+			sb.WriteString(fmt.Sprintf("\t\t\t- %s\n", attr.String()))
+		}
+	}
+
+	return strings.TrimRight(sb.String(), "\n")
+}
+
+// StringifyEvent converts an Event object to a StringEvent object.
+func StringifyEvent(e abci.Event) StringEvent {
+	res := StringEvent{}
+	res.Type = e.Type
+
+	for _, attr := range e.Attributes {
+		res.Attributes = append(
+			res.Attributes,
+			Attribute{string(attr.Key), string(attr.Value)},
+		)
+	}
+
+	return res
+}
+
+// StringifyEvents converts a slice of Event objects into a slice of StringEvent
+// objects.
+func StringifyEvents(events []abci.Event) StringEvents {
+	var res StringEvents
+
+	for _, e := range events {
+		res = append(res, StringifyEvent(e))
+	}
+
+	return res
+}

types/events_test.go

@@ -0,0 +1,22 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestAppendEvents(t *testing.T) {
+	e1 := NewEvent("transfer", Attribute{"sender", "foo"})
+	e2 := NewEvent("transfer", Attribute{"sender", "bar"})
+	a := Events{e1}
+	b := Events{e2}
+	c := a.AppendEvents(b)
+	require.Equal(t, c, Events{e1, e2})
+	require.Equal(t, c, Events{e1}.AppendEvent("transfer", Attribute{"sender", "bar"}))
+	require.Equal(t, c, Events{e1}.AppendEvents(Events{e2}))
+}
+
+func TestEmptyEvents(t *testing.T) {
+	require.Equal(t, EmptyEvents(), Events{})
+}