Enable Orchestrator to set pricing by broadcaster ETH address

[eliteprox]

What does this pull request do? Explain your changes. (required)
Enables orchestrator to set specific pricePerPixel and pricePerUnit by the broadcaster's ETH address.

Specific updates (required)

• Adds new CLI option -pricePerBroadcaster to livepeer.go
• Adds new HTTP handler /setPriceForBroadcaster to handlers.go and webserver.go
• Adds new livepeer_cli menu option to set broadcaster prices.
• Updates tests for pricing

How did you test each of these updates (required)

All tests were ran on testnet with linux using multiple broadcasters and an orchestrator node compiled with the changes.

• Ran livepeer as orchestrator with -pricePerUnit 5, -pixelsPerUnit 1 and -pricePerBroadcaster set to {"broadcasters":[{"ethaddress":"0x6E98a769926f55A65e34066E67198f6B68e4B166","priceperunit":0,"pixelsperunit":1},{"ethaddress":"0xF115A3dfd39778A6719Ace6AA77A2aD228e90329","priceperunit":1200,"pixelsperunit":1}]}

• Ran livepeer as orchestrator with -pricePerUnit 0, -pixelsPerUnit 1 and -pricePerBroadcaster {"broadcasters":[{"ethaddress":"0x6E98a769926f55A65e34066E67198f6B68e4B166","priceperunit":1200,"pixelsperunit":1}]}

• Tested the same using a json file -pricePerBroadcaster broadcasterprices.json.

• Set prices using curl -X POST -d "pixelsPerUnit=1&pricePerUnit=9&broadcasterEthAddr=0xEB62188121725A605f76a97791a1C69B4BdB435D" http://127.0.0.1:7920/setPriceForBroadcaster

• Confirmed correct price sent to broadcaster by verifying payment ticket logs.

• Confirmed no deposit required for broadcaster when broadcaster uses -maxPricePerUnit 0 and orchestrator sets broadcaster's ETH address to a pricePerUnit of 0.

• Confirmed orchestrator's -pricePerUnit and -pricePerPixel continue to function as the default price when a broadcaster is not assigned a specific price via -pricePerBroadcaster, -freeStream or /setPricePerBroadcaster.

Does this pull request close any open issues?

• Implements Add ability to have multiple prices for different Broadcasters #2486

Checklist:

• [ x] Read the contribution guide
• [ x] make runs successfully
• [ x] All tests in ./test.sh pass
• [ x] README and other documentation updated
• [ x] Pending changelog updated

[leszko]

Thank you for the PR! We'll review it in the next 1-2 weeks.

[leszko]

Thank you for the PR. Added a few comments.

[leszko]

Added some super minor comments. Other than that, could you address the following 2 points?

1. The following GH Action is failing, could you check?

2. I've played a little bit with your change and set the price per broadcaster, but then I don't see it in the status when checked from livepeer_cli. Also when I do the following curl call, I don't see the broadcaster prices. Could you check?

$ curl localhost:1936/status
{"Manifests":{},"InternalManifests":{},"StreamInfo":{},"OrchestratorPool":[],"OrchestratorPoolInfos":null,"Version":"0.5.34-129325e0","GolangRuntimeVersion":"go1.18.2","GOArch":"arm64","GOOS":"darwin","RegisteredTranscodersNumber":0,"RegisteredTranscoders":[],"LocalTranscoding":true,"BroadcasterPrices":{}}

[codecov]

Codecov Report

Merging #2592 (6cb541c) into master (dc6e79d) will decrease coverage by 0.12246%.
The diff coverage is 41.17647%.

@@                 Coverage Diff                 @@
##              master       #2592         +/-   ##
===================================================
- Coverage   56.44931%   56.32685%   -0.12246%     
===================================================
  Files             88          88                 
  Lines          18909       19030        +121     
===================================================
+ Hits           10674       10719         +45     
- Misses          7656        7728         +72     
- Partials         579         583          +4     

Impacted Files	Coverage Δ
cmd/livepeer_cli/livepeer_cli.go	0.00000% <ø> (ø)
cmd/livepeer_cli/wizard_stats.go	0.00000% <0.00000%> (ø)
cmd/livepeer_cli/wizard_transcoder.go	0.00000% <0.00000%> (ø)
common/types.go	0.00000% <ø> (ø)
cmd/livepeer/starter/starter.go	2.90262% <31.81818%> (+0.61254%)	⬆️
server/handlers.go	53.83244% <66.66667%> (+0.31645%)	⬆️
cmd/livepeer/livepeer.go	51.46199% <100.00000%> (+0.28551%)	⬆️
common/readfromfile.go	89.28571% <100.00000%> (ø)
core/livepeernode.go	78.00000% <100.00000%> (+5.50000%)	⬆️
core/orchestrator.go	77.93103% <100.00000%> (+0.15324%)	⬆️
... and 3 more

---

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Powered by Codecov. Last update dc6e79d...6cb541c. Read the comment docs.

Impacted Files	Coverage Δ
cmd/livepeer_cli/livepeer_cli.go	0.00000% <ø> (ø)
cmd/livepeer_cli/wizard_stats.go	0.00000% <0.00000%> (ø)
cmd/livepeer_cli/wizard_transcoder.go	0.00000% <0.00000%> (ø)
common/types.go	0.00000% <ø> (ø)
cmd/livepeer/starter/starter.go	2.90262% <31.81818%> (+0.61254%)	⬆️
server/handlers.go	53.83244% <66.66667%> (+0.31645%)	⬆️
cmd/livepeer/livepeer.go	51.46199% <100.00000%> (+0.28551%)	⬆️
common/readfromfile.go	89.28571% <100.00000%> (ø)
core/livepeernode.go	78.00000% <100.00000%> (+5.50000%)	⬆️
core/orchestrator.go	77.93103% <100.00000%> (+0.15324%)	⬆️
... and 3 more

[leszko]

@eliteprox Please re-request review or just comment here when you think that your PR is ready for review.

[leszko]

btw. I've seen the GH Action started to pass 🎉

[ad-astra-video]

@leszko We are adding some tests so the CodeCov reports pass. We had some tests when submitting but it wants a few more.

[eliteprox]

Added some super minor comments. Other than that, could you address the following 2 points?

1. The [following GH Action](https://github.com/livepeer/go-livepeer/actions/runs/3155409577/jobs/5141365984) is failing, could you check?

2. I've played a little bit with your change and set the price per broadcaster, but then I don't see it in the status when checked from `livepeer_cli`. Also when I do the following curl call, I don't see the broadcaster prices. Could you check?

$ curl localhost:1936/status
{"Manifests":{},"InternalManifests":{},"StreamInfo":{},"OrchestratorPool":[],"OrchestratorPoolInfos":null,"Version":"0.5.34-129325e0","GolangRuntimeVersion":"go1.18.2","GOArch":"arm64","GOOS":"darwin","RegisteredTranscodersNumber":0,"RegisteredTranscoders":[],"LocalTranscoding":true,"BroadcasterPrices":{}}

Tests are passing and this now works:
curl localhost:7920/status

{"Manifests":{},"InternalManifests":{},"StreamInfo":{},"OrchestratorPool":[],"OrchestratorPoolInfos":null,"Version":"undefined","GolangRuntimeVersion":"go1.18.1","GOArch":"amd64","GOOS":"linux","RegisteredTranscodersNumber":0,"RegisteredTranscoders":[],"LocalTranscoding":false,"BroadcasterPrices":{"0xeb62188121725a605f76a97791a1c69b4bdb435d":"9","default":"2"}

[leszko]

Revert unrelated change

[leszko]

Add new line at the end of starter_test.go

[leszko]

LGTM 👍

[leszko]

Thanks a lot for this PR @eliteprox